diff --git a/Android.mk b/Android.mk
index 78ea02a..985612f 100644
--- a/Android.mk
+++ b/Android.mk
@@ -84,8 +84,7 @@
 LOCAL_SRC_FILES := \
     $(call all-java-files-under, src) \
     $(call all-java-files-under, src_shortcuts_overrides) \
-    $(call all-java-files-under, src_ui_overrides) \
-    $(call all-java-files-under, src_flags)
+    $(call all-java-files-under, src_ui_overrides)
 
 LOCAL_PROGUARD_FLAG_FILES := proguard.flags
 # Proguard is disable for testing. Derivarive prjects to keep proguard enabled
@@ -163,7 +162,6 @@
     $(call all-java-files-under, src) \
     $(call all-java-files-under, quickstep/src) \
     $(call all-java-files-under, quickstep/recents_ui_overrides/src) \
-    $(call all-java-files-under, src_flags) \
     $(call all-java-files-under, src_shortcuts_overrides)
 
 LOCAL_RESOURCE_DIR := \
diff --git a/go/quickstep/src/com/android/launcher3/uioverrides/RecentsUiFactory.java b/go/quickstep/src/com/android/launcher3/uioverrides/RecentsUiFactory.java
index cbc77d2..ae8fd82 100644
--- a/go/quickstep/src/com/android/launcher3/uioverrides/RecentsUiFactory.java
+++ b/go/quickstep/src/com/android/launcher3/uioverrides/RecentsUiFactory.java
@@ -20,7 +20,6 @@
 import com.android.launcher3.Launcher;
 import com.android.launcher3.LauncherStateManager.StateHandler;
 import com.android.launcher3.Utilities;
-import com.android.launcher3.config.FeatureFlags;
 import com.android.launcher3.graphics.RotationMode;
 import com.android.launcher3.uioverrides.touchcontrollers.LandscapeEdgeSwipeController;
 import com.android.launcher3.uioverrides.touchcontrollers.LandscapeStatesTouchController;
@@ -51,7 +50,7 @@
                     .getMode().hasGestures;
             list.add(new PortraitStatesTouchController(launcher, allowDragToOverview));
         }
-        if (FeatureFlags.PULL_DOWN_STATUS_BAR && Utilities.IS_DEBUG_DEVICE
+        if (Utilities.IS_DEBUG_DEVICE
                 && !launcher.getDeviceProfile().isMultiWindowMode
                 && !launcher.getDeviceProfile().isVerticalBarLayout()) {
             list.add(new StatusBarTouchController(launcher));
diff --git a/go/src/com/android/launcher3/config/FeatureFlags.java b/go/src/com/android/launcher3/config/FeatureFlags.java
deleted file mode 100644
index a90808c..0000000
--- a/go/src/com/android/launcher3/config/FeatureFlags.java
+++ /dev/null
@@ -1,32 +0,0 @@
-/*
- * Copyright (C) 2017 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.launcher3.config;
-
-import android.content.Context;
-
-/**
- * Defines a set of flags used to control various launcher behaviors
- */
-public final class FeatureFlags extends BaseFlags {
-    private FeatureFlags() {
-        // Prevent instantiation
-    }
-
-    // Features to control Launcher3Go behavior
-    public static final boolean GO_DISABLE_WIDGETS = true;
-    public static final boolean LAUNCHER3_SPRING_ICONS = false;
-}
diff --git a/go/src/com/android/launcher3/model/WidgetsModel.java b/go/src/com/android/launcher3/model/WidgetsModel.java
index 18f3f9d..7b8f4e6 100644
--- a/go/src/com/android/launcher3/model/WidgetsModel.java
+++ b/go/src/com/android/launcher3/model/WidgetsModel.java
@@ -37,6 +37,10 @@
  * <p> The widgets and shortcuts are organized using package name as its index.
  */
 public class WidgetsModel {
+
+    // True is the widget support is disabled.
+    public static final boolean GO_DISABLE_WIDGETS = false;
+
     private static final ArrayList<WidgetListRowEntry> EMPTY_WIDGET_LIST = new ArrayList<>();
 
     /**
diff --git a/gradle.properties b/gradle.properties
index 5b90f08..a77f52a 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -10,4 +10,4 @@
 PROTOBUF_DEPENDENCY=com.google.protobuf.nano:protobuf-javanano:3.0.0-alpha-7
 
 BUILD_TOOLS_VERSION=28.0.3
-COMPILE_SDK=android-Q
\ No newline at end of file
+COMPILE_SDK=android-R
diff --git a/quickstep/recents_ui_overrides/src/com/android/launcher3/appprediction/PredictionAppTracker.java b/quickstep/recents_ui_overrides/src/com/android/launcher3/appprediction/PredictionAppTracker.java
index a12917f..79a5ace 100644
--- a/quickstep/recents_ui_overrides/src/com/android/launcher3/appprediction/PredictionAppTracker.java
+++ b/quickstep/recents_ui_overrides/src/com/android/launcher3/appprediction/PredictionAppTracker.java
@@ -1,4 +1,4 @@
-/**
+/*
  * Copyright (C) 2019 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -41,12 +41,19 @@
 import com.android.launcher3.InvariantDeviceProfile;
 import com.android.launcher3.appprediction.PredictionUiStateManager.Client;
 import com.android.launcher3.model.AppLaunchTracker;
+import com.android.launcher3.uioverrides.plugins.PluginManagerWrapper;
+import com.android.systemui.plugins.AppLaunchEventsPlugin;
+import com.android.systemui.plugins.PluginListener;
+
+import java.util.ArrayList;
+import java.util.List;
 
 /**
  * Subclass of app tracker which publishes the data to the prediction engine and gets back results.
  */
 @TargetApi(Build.VERSION_CODES.Q)
-public class PredictionAppTracker extends AppLaunchTracker {
+public class PredictionAppTracker extends AppLaunchTracker
+        implements PluginListener<AppLaunchEventsPlugin> {
 
     private static final String TAG = "PredictionAppTracker";
     private static final boolean DBG = false;
@@ -58,6 +65,7 @@
 
     protected final Context mContext;
     private final Handler mMessageHandler;
+    private final List<AppLaunchEventsPlugin> mAppLaunchEventsPluginsList;
 
     // Accessed only on worker thread
     private AppPredictor mHomeAppPredictor;
@@ -69,6 +77,10 @@
         InvariantDeviceProfile.INSTANCE.get(mContext).addOnChangeListener(this::onIdpChanged);
 
         mMessageHandler.sendEmptyMessage(MSG_INIT);
+
+        mAppLaunchEventsPluginsList = new ArrayList<>();
+        PluginManagerWrapper.INSTANCE.get(context)
+                .addPluginListener(this, AppLaunchEventsPlugin.class, true);
     }
 
     @UiThread
@@ -96,7 +108,7 @@
         AppPredictionManager apm = mContext.getSystemService(AppPredictionManager.class);
 
         if (apm == null) {
-          return null;
+            return null;
         }
 
         AppPredictor predictor = apm.createAppPredictionSession(
@@ -116,7 +128,7 @@
      */
     @WorkerThread
     @Nullable
-    public Bundle getAppPredictionContextExtras(Client client){
+    public Bundle getAppPredictionContextExtras(Client client) {
         return null;
     }
 
@@ -167,12 +179,15 @@
         if (DBG) {
             Log.d(TAG, String.format("Sent immediate message to update %s", client));
         }
+
+        // Relay onReturnedToHome to every plugin.
+        mAppLaunchEventsPluginsList.forEach(AppLaunchEventsPlugin::onReturnedToHome);
     }
 
     @Override
     @UiThread
     public void onStartShortcut(String packageName, String shortcutId, UserHandle user,
-            String container) {
+                                String container) {
         // TODO: Use the full shortcut info
         AppTarget target = new AppTarget.Builder(
                 new AppTargetId("shortcut:" + shortcutId), packageName, user)
@@ -180,6 +195,16 @@
                 .build();
 
         sendLaunch(target, container);
+
+        // Relay onStartShortcut info to every connected plugin.
+        mAppLaunchEventsPluginsList
+                .forEach(plugin -> plugin.onStartShortcut(
+                        packageName,
+                        shortcutId,
+                        user,
+                        container != null ? container : CONTAINER_DEFAULT)
+        );
+
     }
 
     @Override
@@ -191,6 +216,14 @@
                     .setClassName(cn.getClassName())
                     .build();
             sendLaunch(target, container);
+
+            // Relay onStartApp to every connected plugin.
+            mAppLaunchEventsPluginsList
+                    .forEach(plugin -> plugin.onStartApp(
+                            cn,
+                            user,
+                            container != null ? container : CONTAINER_DEFAULT)
+            );
         }
     }
 
@@ -203,6 +236,14 @@
                 .setClassName(cn.getClassName())
                 .build();
         sendDismiss(target, container);
+
+        // Relay onDismissApp to every connected plugin.
+        mAppLaunchEventsPluginsList
+                .forEach(plugin -> plugin.onDismissApp(
+                        cn,
+                        user,
+                        container != null ? container : CONTAINER_DEFAULT)
+        );
     }
 
     @UiThread
@@ -222,4 +263,14 @@
     private void sendDismiss(AppTarget target, String container) {
         sendEvent(target, container, AppTargetEvent.ACTION_DISMISS);
     }
+
+    @Override
+    public void onPluginConnected(AppLaunchEventsPlugin appLaunchEventsPlugin, Context context) {
+        mAppLaunchEventsPluginsList.add(appLaunchEventsPlugin);
+    }
+
+    @Override
+    public void onPluginDisconnected(AppLaunchEventsPlugin appLaunchEventsPlugin) {
+        mAppLaunchEventsPluginsList.remove(appLaunchEventsPlugin);
+    }
 }
diff --git a/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/RecentsUiFactory.java b/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/RecentsUiFactory.java
index 596bc4f..e691566 100644
--- a/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/RecentsUiFactory.java
+++ b/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/RecentsUiFactory.java
@@ -28,17 +28,15 @@
 import com.android.launcher3.Launcher;
 import com.android.launcher3.LauncherState;
 import com.android.launcher3.LauncherStateManager.StateHandler;
-import com.android.launcher3.Utilities;
 import com.android.launcher3.anim.AnimatorPlaybackController;
-import com.android.launcher3.config.FeatureFlags;
 import com.android.launcher3.graphics.RotationMode;
 import com.android.launcher3.uioverrides.touchcontrollers.FlingAndHoldTouchController;
 import com.android.launcher3.uioverrides.touchcontrollers.LandscapeEdgeSwipeController;
 import com.android.launcher3.uioverrides.touchcontrollers.NavBarToHomeTouchController;
 import com.android.launcher3.uioverrides.touchcontrollers.OverviewToAllAppsTouchController;
 import com.android.launcher3.uioverrides.touchcontrollers.PortraitStatesTouchController;
-import com.android.launcher3.uioverrides.touchcontrollers.StatusBarTouchController;
 import com.android.launcher3.uioverrides.touchcontrollers.QuickSwitchTouchController;
+import com.android.launcher3.uioverrides.touchcontrollers.StatusBarTouchController;
 import com.android.launcher3.uioverrides.touchcontrollers.TaskViewTouchController;
 import com.android.launcher3.uioverrides.touchcontrollers.TransposedQuickSwitchTouchController;
 import com.android.launcher3.util.TouchController;
@@ -164,8 +162,7 @@
             }
         }
 
-        if (FeatureFlags.PULL_DOWN_STATUS_BAR
-                && !launcher.getDeviceProfile().isMultiWindowMode) {
+        if (!launcher.getDeviceProfile().isMultiWindowMode) {
             list.add(new StatusBarTouchController(launcher));
         }
 
diff --git a/quickstep/recents_ui_overrides/src/com/android/quickstep/LauncherActivityControllerHelper.java b/quickstep/recents_ui_overrides/src/com/android/quickstep/LauncherActivityControllerHelper.java
index c17b2fe..d7afd32 100644
--- a/quickstep/recents_ui_overrides/src/com/android/quickstep/LauncherActivityControllerHelper.java
+++ b/quickstep/recents_ui_overrides/src/com/android/quickstep/LauncherActivityControllerHelper.java
@@ -66,6 +66,7 @@
 import com.android.quickstep.views.LauncherRecentsView;
 import com.android.quickstep.views.RecentsView;
 import com.android.quickstep.views.TaskView;
+import com.android.systemui.plugins.shared.LauncherOverlayManager;
 import com.android.systemui.shared.system.RemoteAnimationTargetCompat;
 
 import java.util.function.BiPredicate;
@@ -478,4 +479,18 @@
     public void onLaunchTaskSuccess(Launcher launcher) {
         launcher.getStateManager().moveToRestState();
     }
+
+    @Override
+    public void closeOverlay() {
+        Launcher launcher = getCreatedActivity();
+        if (launcher == null) {
+            return;
+        }
+        LauncherOverlayManager om = launcher.getOverlayManager();
+        if (!launcher.isStarted() || launcher.isForceInvisible()) {
+            om.hideOverlay(false /* animate */);
+        } else {
+            om.hideOverlay(150);
+        }
+    }
 }
\ No newline at end of file
diff --git a/quickstep/recents_ui_overrides/src/com/android/quickstep/TouchInteractionService.java b/quickstep/recents_ui_overrides/src/com/android/quickstep/TouchInteractionService.java
index 729287c..d7ed090 100644
--- a/quickstep/recents_ui_overrides/src/com/android/quickstep/TouchInteractionService.java
+++ b/quickstep/recents_ui_overrides/src/com/android/quickstep/TouchInteractionService.java
@@ -65,10 +65,6 @@
 import android.view.MotionEvent;
 import android.view.Surface;
 
-import androidx.annotation.BinderThread;
-import androidx.annotation.UiThread;
-import androidx.annotation.WorkerThread;
-
 import com.android.launcher3.BaseDraggingActivity;
 import com.android.launcher3.R;
 import com.android.launcher3.ResourceUtils;
@@ -110,6 +106,10 @@
 import java.util.LinkedList;
 import java.util.List;
 
+import androidx.annotation.BinderThread;
+import androidx.annotation.UiThread;
+import androidx.annotation.WorkerThread;
+
 /**
  * Wrapper around a list for processing arguments.
  */
@@ -271,7 +271,6 @@
     private OverviewCommandHelper mOverviewCommandHelper;
     private OverviewComponentObserver mOverviewComponentObserver;
     private OverviewInteractionState mOverviewInteractionState;
-    private OverviewCallbacks mOverviewCallbacks;
     private TaskOverlayFactory mTaskOverlayFactory;
     private InputConsumerController mInputConsumer;
     private boolean mAssistantAvailable;
@@ -468,7 +467,6 @@
 
         mOverviewCommandHelper = new OverviewCommandHelper(this, mOverviewComponentObserver);
         mOverviewInteractionState = OverviewInteractionState.INSTANCE.get(this);
-        mOverviewCallbacks = OverviewCallbacks.get(this);
         mTaskOverlayFactory = TaskOverlayFactory.INSTANCE.get(this);
         mInputConsumer = InputConsumerController.getRecentsAnimationInputConsumer();
         mIsUserUnlocked = true;
@@ -701,20 +699,20 @@
 
         final boolean shouldDefer;
         final BaseSwipeUpHandler.Factory factory;
+        ActivityControlHelper activityControlHelper =
+                mOverviewComponentObserver.getActivityControlHelper();
 
         if (mMode == Mode.NO_BUTTON && !mOverviewComponentObserver.isHomeAndOverviewSame()) {
             shouldDefer = !sSwipeSharedState.recentsAnimationFinishInterrupted;
             factory = mFallbackNoButtonFactory;
         } else {
-            shouldDefer = mOverviewComponentObserver.getActivityControlHelper()
-                    .deferStartingActivity(mActiveNavBarRegion, event);
+            shouldDefer = activityControlHelper.deferStartingActivity(mActiveNavBarRegion, event);
             factory = mWindowTreansformFactory;
         }
 
-        return new OtherActivityInputConsumer(this, runningTaskInfo,
-                shouldDefer, mOverviewCallbacks, this::onConsumerInactive,
-                sSwipeSharedState, mInputMonitorCompat, mSwipeTouchRegion,
-                disableHorizontalSwipe(event), factory, mLogId);
+        return new OtherActivityInputConsumer(this, runningTaskInfo, shouldDefer,
+                this::onConsumerInactive, sSwipeSharedState, mInputMonitorCompat, mSwipeTouchRegion,
+                disableHorizontalSwipe(event), activityControlHelper, factory, mLogId);
     }
 
     private InputConsumer createDeviceLockedInputConsumer(RunningTaskInfo taskInfo) {
@@ -736,10 +734,10 @@
 
         if (activity.getRootView().hasWindowFocus() || sSwipeSharedState.goingToLauncher) {
             return new OverviewInputConsumer(activity, mInputMonitorCompat,
-                    false /* startingInActivityBounds */);
+                    false /* startingInActivityBounds */, activityControl);
         } else {
             return new OverviewWithoutFocusInputConsumer(activity, mInputMonitorCompat,
-                    disableHorizontalSwipe(event));
+                    activityControl, disableHorizontalSwipe(event));
         }
     }
 
diff --git a/quickstep/recents_ui_overrides/src/com/android/quickstep/WindowTransformSwipeHandler.java b/quickstep/recents_ui_overrides/src/com/android/quickstep/WindowTransformSwipeHandler.java
index 411a808..cd31fe0 100644
--- a/quickstep/recents_ui_overrides/src/com/android/quickstep/WindowTransformSwipeHandler.java
+++ b/quickstep/recents_ui_overrides/src/com/android/quickstep/WindowTransformSwipeHandler.java
@@ -684,8 +684,8 @@
         }
 
         BaseDraggingActivity activity = mActivityControlHelper.getCreatedActivity();
-        return activity == null
-                ? InputConsumer.NO_OP : new OverviewInputConsumer(activity, null, true);
+        return activity == null ? InputConsumer.NO_OP
+                : new OverviewInputConsumer(activity, null, true, mActivityControlHelper);
     }
 
     private void endRunningWindowAnim(boolean cancel) {
diff --git a/quickstep/recents_ui_overrides/src/com/android/quickstep/inputconsumers/OtherActivityInputConsumer.java b/quickstep/recents_ui_overrides/src/com/android/quickstep/inputconsumers/OtherActivityInputConsumer.java
index e41880d..f06702d 100644
--- a/quickstep/recents_ui_overrides/src/com/android/quickstep/inputconsumers/OtherActivityInputConsumer.java
+++ b/quickstep/recents_ui_overrides/src/com/android/quickstep/inputconsumers/OtherActivityInputConsumer.java
@@ -22,6 +22,7 @@
 import static android.view.MotionEvent.ACTION_POINTER_UP;
 import static android.view.MotionEvent.ACTION_UP;
 import static android.view.MotionEvent.INVALID_POINTER_ID;
+
 import static com.android.launcher3.Utilities.EDGE_NAV_BAR;
 import static com.android.launcher3.Utilities.squaredHypot;
 import static com.android.launcher3.util.RaceConditionTracker.ENTER;
@@ -44,14 +45,16 @@
 import android.view.MotionEvent;
 import android.view.VelocityTracker;
 import android.view.ViewConfiguration;
+
 import androidx.annotation.UiThread;
+
 import com.android.launcher3.R;
 import com.android.launcher3.util.Preconditions;
 import com.android.launcher3.util.RaceConditionTracker;
 import com.android.launcher3.util.TraceHelper;
+import com.android.quickstep.ActivityControlHelper;
 import com.android.quickstep.BaseSwipeUpHandler;
 import com.android.quickstep.BaseSwipeUpHandler.Factory;
-import com.android.quickstep.OverviewCallbacks;
 import com.android.quickstep.SwipeSharedState;
 import com.android.quickstep.SysUINavigationMode;
 import com.android.quickstep.SysUINavigationMode.Mode;
@@ -61,6 +64,7 @@
 import com.android.quickstep.util.RecentsAnimationListenerSet;
 import com.android.systemui.shared.system.ActivityManagerWrapper;
 import com.android.systemui.shared.system.InputMonitorCompat;
+
 import java.util.function.Consumer;
 
 /**
@@ -77,11 +81,11 @@
 
     private final CachedEventDispatcher mRecentsViewDispatcher = new CachedEventDispatcher();
     private final RunningTaskInfo mRunningTask;
-    private final OverviewCallbacks mOverviewCallbacks;
     private final SwipeSharedState mSwipeSharedState;
     private final InputMonitorCompat mInputMonitorCompat;
     private final SysUINavigationMode.Mode mMode;
     private final RectF mSwipeTouchRegion;
+    private final ActivityControlHelper mActivityControlHelper;
 
     private final BaseSwipeUpHandler.Factory mHandlerFactory;
 
@@ -121,10 +125,10 @@
     private int mLogId;
 
     public OtherActivityInputConsumer(Context base, RunningTaskInfo runningTaskInfo,
-            boolean isDeferredDownTarget, OverviewCallbacks overviewCallbacks,
-            Consumer<OtherActivityInputConsumer> onCompleteCallback,
+            boolean isDeferredDownTarget, Consumer<OtherActivityInputConsumer> onCompleteCallback,
             SwipeSharedState swipeSharedState, InputMonitorCompat inputMonitorCompat,
             RectF swipeTouchRegion, boolean disableHorizontalSwipe,
+            ActivityControlHelper activityControlHelper,
             Factory handlerFactory, int logId) {
         super(base);
         mLogId = logId;
@@ -134,6 +138,7 @@
         mMode = SysUINavigationMode.getMode(base);
         mSwipeTouchRegion = swipeTouchRegion;
         mHandlerFactory = handlerFactory;
+        mActivityControlHelper = activityControlHelper;
 
         mMotionPauseDetector = new MotionPauseDetector(base);
         mMotionPauseMinDisplacement = base.getResources().getDimension(
@@ -144,7 +149,6 @@
 
         boolean continuingPreviousGesture = swipeSharedState.getActiveListener() != null;
         mIsDeferredDownTarget = !continuingPreviousGesture && isDeferredDownTarget;
-        mOverviewCallbacks = overviewCallbacks;
         mSwipeSharedState = swipeSharedState;
 
         mNavBarPosition = new NavBarPosition(base);
@@ -313,7 +317,7 @@
         }
         mInputMonitorCompat.pilferPointers();
 
-        mOverviewCallbacks.closeAllWindows();
+        mActivityControlHelper.closeOverlay();
         ActivityManagerWrapper.getInstance().closeSystemWindows(
                 CLOSE_SYSTEM_WINDOWS_REASON_RECENTS);
 
diff --git a/quickstep/recents_ui_overrides/src/com/android/quickstep/inputconsumers/OverviewInputConsumer.java b/quickstep/recents_ui_overrides/src/com/android/quickstep/inputconsumers/OverviewInputConsumer.java
index e553891..4857d00 100644
--- a/quickstep/recents_ui_overrides/src/com/android/quickstep/inputconsumers/OverviewInputConsumer.java
+++ b/quickstep/recents_ui_overrides/src/com/android/quickstep/inputconsumers/OverviewInputConsumer.java
@@ -19,7 +19,6 @@
 import static com.android.quickstep.TouchInteractionService.TOUCH_INTERACTION_LOG;
 import static com.android.systemui.shared.system.ActivityManagerWrapper.CLOSE_SYSTEM_WINDOWS_REASON_RECENTS;
 
-import android.util.Log;
 import android.view.KeyEvent;
 import android.view.MotionEvent;
 
@@ -27,9 +26,8 @@
 
 import com.android.launcher3.BaseDraggingActivity;
 import com.android.launcher3.Utilities;
-import com.android.launcher3.testing.TestProtocol;
 import com.android.launcher3.views.BaseDragLayer;
-import com.android.quickstep.OverviewCallbacks;
+import com.android.quickstep.ActivityControlHelper;
 import com.android.systemui.shared.system.ActivityManagerWrapper;
 import com.android.systemui.shared.system.InputMonitorCompat;
 
@@ -42,6 +40,7 @@
         implements InputConsumer {
 
     private final T mActivity;
+    private final ActivityControlHelper<T> mActivityControlHelper;
     private final BaseDragLayer mTarget;
     private final InputMonitorCompat mInputMonitor;
 
@@ -53,10 +52,12 @@
     private boolean mTargetHandledTouch;
 
     public OverviewInputConsumer(T activity, @Nullable InputMonitorCompat inputMonitor,
-            boolean startingInActivityBounds) {
+            boolean startingInActivityBounds,
+            ActivityControlHelper<T> activityControlHelper) {
         mActivity = activity;
         mInputMonitor = inputMonitor;
         mStartingInActivityBounds = startingInActivityBounds;
+        mActivityControlHelper = activityControlHelper;
 
         mTarget = activity.getDragLayer();
         if (startingInActivityBounds) {
@@ -98,7 +99,7 @@
         if (!mTargetHandledTouch && handled) {
             mTargetHandledTouch = true;
             if (!mStartingInActivityBounds) {
-                OverviewCallbacks.get(mActivity).closeAllWindows();
+                mActivityControlHelper.closeOverlay();
                 ActivityManagerWrapper.getInstance()
                         .closeSystemWindows(CLOSE_SYSTEM_WINDOWS_REASON_RECENTS);
                 TOUCH_INTERACTION_LOG.addLog("startQuickstep");
diff --git a/quickstep/recents_ui_overrides/src/com/android/quickstep/inputconsumers/OverviewWithoutFocusInputConsumer.java b/quickstep/recents_ui_overrides/src/com/android/quickstep/inputconsumers/OverviewWithoutFocusInputConsumer.java
index 05cbb78..e11d492 100644
--- a/quickstep/recents_ui_overrides/src/com/android/quickstep/inputconsumers/OverviewWithoutFocusInputConsumer.java
+++ b/quickstep/recents_ui_overrides/src/com/android/quickstep/inputconsumers/OverviewWithoutFocusInputConsumer.java
@@ -34,10 +34,9 @@
 import com.android.launcher3.BaseDraggingActivity;
 import com.android.launcher3.Utilities;
 import com.android.launcher3.logging.StatsLogUtils;
-import com.android.launcher3.userevent.nano.LauncherLogProto.ContainerType;
 import com.android.launcher3.userevent.nano.LauncherLogProto.Action.Direction;
 import com.android.launcher3.userevent.nano.LauncherLogProto.Action.Touch;
-import com.android.quickstep.OverviewCallbacks;
+import com.android.quickstep.ActivityControlHelper;
 import com.android.quickstep.util.NavBarPosition;
 import com.android.systemui.shared.system.ActivityManagerWrapper;
 import com.android.systemui.shared.system.InputMonitorCompat;
@@ -50,16 +49,17 @@
     private final float mSquaredTouchSlop;
     private final Context mContext;
     private final NavBarPosition mNavBarPosition;
+    private final ActivityControlHelper mActivityControlHelper;
 
     private boolean mInterceptedTouch;
     private VelocityTracker mVelocityTracker;
 
-
     public OverviewWithoutFocusInputConsumer(Context context, InputMonitorCompat inputMonitor,
-            boolean disableHorizontalSwipe) {
+            ActivityControlHelper activityControlHelper, boolean disableHorizontalSwipe) {
         mInputMonitor = inputMonitor;
         mDisableHorizontalSwipe = disableHorizontalSwipe;
         mContext = context;
+        mActivityControlHelper = activityControlHelper;
         mSquaredTouchSlop = Utilities.squaredTouchSlop(context);
         mNavBarPosition = new NavBarPosition(context);
 
@@ -148,7 +148,7 @@
         }
 
         if (triggerQuickstep) {
-            OverviewCallbacks.get(mContext).closeAllWindows();
+            mActivityControlHelper.closeOverlay();
             ActivityManagerWrapper.getInstance()
                     .closeSystemWindows(CLOSE_SYSTEM_WINDOWS_REASON_RECENTS);
             TOUCH_INTERACTION_LOG.addLog("startQuickstep");
diff --git a/quickstep/recents_ui_overrides/src/com/android/quickstep/views/TaskThumbnailView.java b/quickstep/recents_ui_overrides/src/com/android/quickstep/views/TaskThumbnailView.java
index 7f1e898..2e6b662 100644
--- a/quickstep/recents_ui_overrides/src/com/android/quickstep/views/TaskThumbnailView.java
+++ b/quickstep/recents_ui_overrides/src/com/android/quickstep/views/TaskThumbnailView.java
@@ -44,7 +44,6 @@
 import com.android.launcher3.DeviceProfile;
 import com.android.launcher3.R;
 import com.android.launcher3.Utilities;
-import com.android.launcher3.config.FeatureFlags;
 import com.android.launcher3.util.SystemUiController;
 import com.android.launcher3.util.Themes;
 import com.android.quickstep.TaskOverlayFactory;
@@ -308,8 +307,7 @@
                 final Configuration configuration =
                         getContext().getResources().getConfiguration();
                 // Rotate the screenshot if not in multi-window mode
-                isRotated = FeatureFlags.OVERVIEW_USE_SCREENSHOT_ORIENTATION &&
-                        configuration.orientation != mThumbnailData.orientation &&
+                isRotated = configuration.orientation != mThumbnailData.orientation &&
                         !mActivity.isInMultiWindowMode() &&
                         mThumbnailData.windowingMode == WINDOWING_MODE_FULLSCREEN;
                 // Scale the screenshot to always fit the width of the card.
diff --git a/quickstep/res/values/config.xml b/quickstep/res/values/config.xml
index 5c4d6d8..98aaceb 100644
--- a/quickstep/res/values/config.xml
+++ b/quickstep/res/values/config.xml
@@ -16,8 +16,6 @@
 <resources>
     <string name="task_overlay_factory_class" translatable="false"></string>
 
-    <string name="overview_callbacks_class" translatable="false"></string>
-
     <!-- Activity which blocks home gesture -->
     <string name="gesture_blocking_activity" translatable="false"></string>
 
diff --git a/quickstep/src/com/android/launcher3/LauncherInitListener.java b/quickstep/src/com/android/launcher3/LauncherInitListener.java
index b9ce1ce..38f9956 100644
--- a/quickstep/src/com/android/launcher3/LauncherInitListener.java
+++ b/quickstep/src/com/android/launcher3/LauncherInitListener.java
@@ -25,7 +25,6 @@
 
 import com.android.launcher3.states.InternalStateHandler;
 import com.android.quickstep.ActivityControlHelper.ActivityInitListener;
-import com.android.quickstep.OverviewCallbacks;
 import com.android.quickstep.util.RemoteAnimationProvider;
 
 import java.util.function.BiPredicate;
@@ -63,7 +62,7 @@
                 return null;
             }, cancellationSignal);
         }
-        OverviewCallbacks.get(launcher).onInitOverviewTransition();
+        launcher.deferOverlayCallbacksUntilNextResumeOrStop();
         return mOnInitListener.test(launcher, alreadyOnHome);
     }
 
diff --git a/quickstep/src/com/android/launcher3/uioverrides/TogglableFlag.java b/quickstep/src/com/android/launcher3/uioverrides/TogglableFlag.java
index 853a1c6..27d81ef 100644
--- a/quickstep/src/com/android/launcher3/uioverrides/TogglableFlag.java
+++ b/quickstep/src/com/android/launcher3/uioverrides/TogglableFlag.java
@@ -18,7 +18,8 @@
 
 import android.content.Context;
 import android.provider.DeviceConfig;
-import com.android.launcher3.config.BaseFlags.BaseTogglableFlag;
+
+import com.android.launcher3.config.FeatureFlags.BaseTogglableFlag;
 
 public class TogglableFlag extends BaseTogglableFlag {
     public static final String NAMESPACE_LAUNCHER = "launcher";
@@ -36,14 +37,14 @@
     @Override
     public void addChangeListener(Context context, Runnable r) {
         DeviceConfig.addOnPropertiesChangedListener(
-            NAMESPACE_LAUNCHER,
-            context.getMainExecutor(),
-            (properties) -> {
-                if (!NAMESPACE_LAUNCHER.equals(properties.getNamespace())) {
-                    return;
-                }
-                initialize(context);
-                r.run();
-            });
+                NAMESPACE_LAUNCHER,
+                context.getMainExecutor(),
+                (properties) -> {
+                    if (!NAMESPACE_LAUNCHER.equals(properties.getNamespace())) {
+                        return;
+                    }
+                    initialize(context);
+                    r.run();
+                });
     }
 }
diff --git a/quickstep/src/com/android/quickstep/ActivityControlHelper.java b/quickstep/src/com/android/quickstep/ActivityControlHelper.java
index 5c9c7d4..609fb26 100644
--- a/quickstep/src/com/android/quickstep/ActivityControlHelper.java
+++ b/quickstep/src/com/android/quickstep/ActivityControlHelper.java
@@ -97,6 +97,8 @@
 
     void onLaunchTaskSuccess(T activity);
 
+    default void closeOverlay() { }
+
     interface ActivityInitListener {
 
         void register();
diff --git a/quickstep/src/com/android/quickstep/OverviewCallbacks.java b/quickstep/src/com/android/quickstep/OverviewCallbacks.java
deleted file mode 100644
index f5573ba..0000000
--- a/quickstep/src/com/android/quickstep/OverviewCallbacks.java
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * Copyright (C) 2018 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package com.android.quickstep;
-
-import android.content.Context;
-
-import com.android.launcher3.R;
-import com.android.launcher3.util.Preconditions;
-import com.android.launcher3.util.ResourceBasedOverride;
-
-/**
- * Callbacks related to overview/quicksteps.
- */
-public class OverviewCallbacks implements ResourceBasedOverride {
-
-    private static OverviewCallbacks sInstance;
-
-    public static OverviewCallbacks get(Context context) {
-        Preconditions.assertUIThread();
-        if (sInstance == null) {
-            sInstance = Overrides.getObject(OverviewCallbacks.class,
-                    context.getApplicationContext(), R.string.overview_callbacks_class);
-        }
-        return sInstance;
-    }
-
-    public void onInitOverviewTransition() { }
-
-    public void closeAllWindows() { }
-}
diff --git a/res/values/attrs.xml b/res/values/attrs.xml
index 69b8c8a..2b265fa 100644
--- a/res/values/attrs.xml
+++ b/res/values/attrs.xml
@@ -152,21 +152,6 @@
         <attr name="canThumbDetach" format="boolean" />
     </declare-styleable>
 
-    <declare-styleable name="CustomAppWidgetProviderInfo">
-        <attr name="providerId" format="integer" />
-
-        <attr name="android:label" />
-        <attr name="android:initialLayout" />
-        <attr name="android:icon" />
-        <attr name="android:previewImage" />
-        <attr name="android:resizeMode" />
-
-        <attr name="numRows" />
-        <attr name="numColumns" />
-        <attr name="numMinRows" format="integer" />
-        <attr name="numMinColumns" format="integer" />
-    </declare-styleable>
-
     <declare-styleable name="PreviewFragment">
         <attr name="android:name" />
         <attr name="android:id" />
diff --git a/res/xml/custom_widgets.xml b/res/xml/custom_widgets.xml
deleted file mode 100644
index 4b54386..0000000
--- a/res/xml/custom_widgets.xml
+++ /dev/null
@@ -1,31 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-     Copyright (C) 2017 The Android Open Source Project
-
-     Licensed under the Apache License, Version 2.0 (the "License");
-     you may not use this file except in compliance with the License.
-     You may obtain a copy of the License at
-
-          http://www.apache.org/licenses/LICENSE-2.0
-
-     Unless required by applicable law or agreed to in writing, software
-     distributed under the License is distributed on an "AS IS" BASIS,
-     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-     See the License for the specific language governing permissions and
-     limitations under the License.
--->
-
-<widgets>
-    <!-- Sample widget definition
-        <widget
-            android:label="My custom widget"
-            android:initialLayout="@layout/sample_widget_layout"
-            android:icon="@drawable/ic_launcher_home"
-            android:resizeMode="horizontal|vertical"
-            launcher:numRows="2"
-            launcher:numColumns="3"
-            launcher:numMinRows="1"
-            launcher:numMinColumns="2"
-            launcher:providerId="1" />
-    -->
-</widgets>
\ No newline at end of file
diff --git a/robolectric_tests/src/com/android/launcher3/config/FlagOverrideRule.java b/robolectric_tests/src/com/android/launcher3/config/FlagOverrideRule.java
index a3d1216..e49c67c 100644
--- a/robolectric_tests/src/com/android/launcher3/config/FlagOverrideRule.java
+++ b/robolectric_tests/src/com/android/launcher3/config/FlagOverrideRule.java
@@ -1,8 +1,9 @@
 package com.android.launcher3.config;
 
 
-import com.android.launcher3.config.BaseFlags.BaseTogglableFlag;
+import com.android.launcher3.config.FeatureFlags.BaseTogglableFlag;
 import com.android.launcher3.uioverrides.TogglableFlag;
+
 import org.junit.rules.TestRule;
 import org.junit.runner.Description;
 import org.junit.runners.model.Statement;
diff --git a/robolectric_tests/src/com/android/launcher3/config/FlagOverrideSampleTest.java b/robolectric_tests/src/com/android/launcher3/config/FlagOverrideSampleTest.java
index 1351348..ace1420 100644
--- a/robolectric_tests/src/com/android/launcher3/config/FlagOverrideSampleTest.java
+++ b/robolectric_tests/src/com/android/launcher3/config/FlagOverrideSampleTest.java
@@ -1,5 +1,8 @@
 package com.android.launcher3.config;
 
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
 import com.android.launcher3.config.FlagOverrideRule.FlagOverride;
 
 import org.junit.Rule;
@@ -7,9 +10,6 @@
 import org.junit.runner.RunWith;
 import org.robolectric.RobolectricTestRunner;
 
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertTrue;
-
 /**
  * Sample Robolectric test that demonstrates flag-overriding.
  */
@@ -24,13 +24,12 @@
     @FlagOverride(key = "EXAMPLE_FLAG", value = true)
     @Test
     public void withFlagOn() {
-        assertTrue(FeatureFlags.EXAMPLE_FLAG.get());
+        assertTrue(FeatureFlags.FAKE_LANDSCAPE_UI.get());
     }
 
-
     @FlagOverride(key = "EXAMPLE_FLAG", value = false)
     @Test
     public void withFlagOff() {
-        assertFalse(FeatureFlags.EXAMPLE_FLAG.get());
+        assertFalse(FeatureFlags.FAKE_LANDSCAPE_UI.get());
     }
 }
diff --git a/robolectric_tests/src/com/android/launcher3/util/TestLauncherProvider.java b/robolectric_tests/src/com/android/launcher3/util/TestLauncherProvider.java
index 31e303e..9f833b1 100644
--- a/robolectric_tests/src/com/android/launcher3/util/TestLauncherProvider.java
+++ b/robolectric_tests/src/com/android/launcher3/util/TestLauncherProvider.java
@@ -2,7 +2,6 @@
 
 import android.content.Context;
 import android.database.sqlite.SQLiteDatabase;
-import android.database.sqlite.SQLiteOpenHelper;
 
 import com.android.launcher3.LauncherProvider;
 
@@ -28,9 +27,6 @@
         return mOpenHelper.getWritableDatabase();
     }
 
-    @Override
-    protected void notifyListeners() { }
-
     private static class MyDatabaseHelper extends DatabaseHelper {
         public MyDatabaseHelper(Context context) {
             super(context, null, null);
diff --git a/src/com/android/launcher3/AppWidgetsRestoredReceiver.java b/src/com/android/launcher3/AppWidgetsRestoredReceiver.java
index e3ef5d6..5f1be94 100644
--- a/src/com/android/launcher3/AppWidgetsRestoredReceiver.java
+++ b/src/com/android/launcher3/AppWidgetsRestoredReceiver.java
@@ -1,5 +1,7 @@
 package com.android.launcher3;
 
+import static android.os.Process.myUserHandle;
+
 import android.appwidget.AppWidgetHost;
 import android.appwidget.AppWidgetManager;
 import android.appwidget.AppWidgetProviderInfo;
@@ -12,15 +14,13 @@
 
 import com.android.launcher3.LauncherSettings.Favorites;
 import com.android.launcher3.compat.UserManagerCompat;
-import com.android.launcher3.config.FeatureFlags;
 import com.android.launcher3.model.LoaderTask;
+import com.android.launcher3.model.WidgetsModel;
 import com.android.launcher3.provider.RestoreDbTask;
 import com.android.launcher3.util.ContentWriter;
 
 import androidx.annotation.WorkerThread;
 
-import static android.os.Process.myUserHandle;
-
 public class AppWidgetsRestoredReceiver extends BroadcastReceiver {
 
     private static final String TAG = "AWRestoredReceiver";
@@ -50,7 +50,7 @@
     @WorkerThread
     public static void restoreAppWidgetIds(Context context, int[] oldWidgetIds, int[] newWidgetIds) {
         AppWidgetHost appWidgetHost = new LauncherAppWidgetHost(context);
-        if (FeatureFlags.GO_DISABLE_WIDGETS) {
+        if (WidgetsModel.GO_DISABLE_WIDGETS) {
             Log.e(TAG, "Skipping widget ID remap as widgets not supported");
             appWidgetHost.deleteHost();
             return;
diff --git a/src/com/android/launcher3/InstallShortcutReceiver.java b/src/com/android/launcher3/InstallShortcutReceiver.java
index fb80537..c9e7d91 100644
--- a/src/com/android/launcher3/InstallShortcutReceiver.java
+++ b/src/com/android/launcher3/InstallShortcutReceiver.java
@@ -133,7 +133,8 @@
 
             String pkg = getIntentPackage(info.launchIntent);
             if (!TextUtils.isEmpty(pkg)
-                    && !launcherApps.isPackageEnabledForProfile(pkg, info.user)) {
+                    && !launcherApps.isPackageEnabledForProfile(pkg, info.user)
+                    && !info.isActivity) {
                 if (DBG) {
                     Log.d(TAG, "Ignoring shortcut for absent package: " + info.launchIntent);
                 }
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index d667e8c..a2db411 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -27,6 +27,7 @@
 import static com.android.launcher3.LauncherState.NORMAL;
 import static com.android.launcher3.LauncherState.OVERVIEW;
 import static com.android.launcher3.LauncherState.OVERVIEW_PEEK;
+import static com.android.launcher3.Utilities.postAsyncCallback;
 import static com.android.launcher3.dragndrop.DragLayer.ALPHA_INDEX_LAUNCHER_LOAD;
 import static com.android.launcher3.logging.LoggerUtils.newContainerTarget;
 import static com.android.launcher3.logging.LoggerUtils.newTarget;
@@ -79,6 +80,7 @@
 import android.widget.Toast;
 
 import androidx.annotation.Nullable;
+import androidx.annotation.VisibleForTesting;
 
 import com.android.launcher3.DropTarget.DragObject;
 import com.android.launcher3.accessibility.LauncherAccessibilityDelegate;
@@ -115,6 +117,7 @@
 import com.android.launcher3.states.RotationHelper;
 import com.android.launcher3.touch.ItemClickHandler;
 import com.android.launcher3.uioverrides.UiFactory;
+import com.android.launcher3.uioverrides.plugins.PluginManagerWrapper;
 import com.android.launcher3.userevent.nano.LauncherLogProto;
 import com.android.launcher3.userevent.nano.LauncherLogProto.Action;
 import com.android.launcher3.userevent.nano.LauncherLogProto.ContainerType;
@@ -147,7 +150,13 @@
 import com.android.launcher3.widget.WidgetHostViewLoader;
 import com.android.launcher3.widget.WidgetListRowEntry;
 import com.android.launcher3.widget.WidgetsFullSheet;
-import com.android.launcher3.widget.custom.CustomWidgetParser;
+import com.android.launcher3.widget.custom.CustomWidgetManager;
+import com.android.systemui.plugins.OverlayPlugin;
+import com.android.systemui.plugins.PluginListener;
+import com.android.systemui.plugins.shared.LauncherExterns;
+import com.android.systemui.plugins.shared.LauncherOverlayManager;
+import com.android.systemui.plugins.shared.LauncherOverlayManager.LauncherOverlay;
+import com.android.systemui.plugins.shared.LauncherOverlayManager.LauncherOverlayCallbacks;
 
 import java.io.FileDescriptor;
 import java.io.PrintWriter;
@@ -157,16 +166,14 @@
 import java.util.HashSet;
 import java.util.List;
 import java.util.function.Predicate;
-
-import androidx.annotation.Nullable;
-import androidx.annotation.VisibleForTesting;
+import java.util.function.Supplier;
 
 /**
  * Default launcher application.
  */
 public class Launcher extends BaseDraggingActivity implements LauncherExterns,
         Callbacks, LauncherProviderChangeListener, UserEventDelegate,
-        InvariantDeviceProfile.OnIDPChangeListener {
+        InvariantDeviceProfile.OnIDPChangeListener, PluginListener<OverlayPlugin> {
     public static final String TAG = "Launcher";
     static final boolean LOGD = false;
 
@@ -295,6 +302,11 @@
     private DeviceProfile mStableDeviceProfile;
     private RotationMode mRotationMode = RotationMode.NORMAL;
 
+    protected LauncherOverlayManager mOverlayManager;
+    // If true, overlay callbacks are deferred
+    private boolean mDeferOverlayCallbacks;
+    private final Runnable mDeferredOverlayCallbacks = this::checkIfOverlayStillDeferred;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         RaceConditionTracker.onEvent(ON_CREATE_EVT, ENTER);
@@ -391,6 +403,10 @@
         if (mLauncherCallbacks != null) {
             mLauncherCallbacks.onCreate(savedInstanceState);
         }
+        mOverlayManager = getDefaultOverlay();
+        PluginManagerWrapper.INSTANCE.get(this).addPluginListener(this,
+                OverlayPlugin.class, false /* allowedMultiple */);
+
         mRotationHelper.initialize();
 
         TraceHelper.endSection("Launcher-onCreate");
@@ -416,6 +432,38 @@
         });
     }
 
+    protected LauncherOverlayManager getDefaultOverlay() {
+        return new LauncherOverlayManager() { };
+    }
+
+    @Override
+    public void onPluginConnected(OverlayPlugin overlayManager, Context context) {
+        switchOverlay(() -> overlayManager.createOverlayManager(this, this));
+    }
+
+    @Override
+    public void onPluginDisconnected(OverlayPlugin plugin) {
+        switchOverlay(this::getDefaultOverlay);
+    }
+
+    private void switchOverlay(Supplier<LauncherOverlayManager> overlaySupplier) {
+        if (mOverlayManager != null) {
+            mOverlayManager.onActivityDestroyed(this);
+        }
+        mOverlayManager = overlaySupplier.get();
+        if (getRootView().isAttachedToWindow()) {
+            mOverlayManager.onAttachedToWindow();
+        }
+        mDeferOverlayCallbacks = true;
+        checkIfOverlayStillDeferred();
+    }
+
+    @Override
+    protected void dispatchDeviceProfileChanged() {
+        super.dispatchDeviceProfileChanged();
+        mOverlayManager.onDeviceProvideChanged();
+    }
+
     @Override
     public void onEnterAnimationComplete() {
         super.onEnterAnimationComplete();
@@ -572,6 +620,7 @@
     /**
      * Call this after onCreate to set or clear overlay.
      */
+    @Override
     public void setLauncherOverlay(LauncherOverlay overlay) {
         if (overlay != null) {
             overlay.setOverlayCallbacks(new LauncherOverlayCallbacksImpl());
@@ -579,18 +628,16 @@
         mWorkspace.setLauncherOverlay(overlay);
     }
 
+    @Override
+    public void runOnOverlayHidden(Runnable runnable) {
+        getWorkspace().runOnOverlayHidden(runnable);
+    }
+
     public boolean setLauncherCallbacks(LauncherCallbacks callbacks) {
         mLauncherCallbacks = callbacks;
         return true;
     }
 
-    @Override
-    public void onLauncherProviderChanged() {
-        if (mLauncherCallbacks != null) {
-            mLauncherCallbacks.onLauncherProviderChange();
-        }
-    }
-
     public boolean isDraggingEnabled() {
         // We prevent dragging when we are loading the workspace as it is possible to pick up a view
         // that is subsequently removed from the workspace in startBinding().
@@ -789,9 +836,6 @@
             final int requestCode, final int resultCode, final Intent data) {
         mPendingActivityRequestCode = -1;
         handleActivityResult(requestCode, resultCode, data);
-        if (mLauncherCallbacks != null) {
-            mLauncherCallbacks.onActivityResult(requestCode, resultCode, data);
-        }
     }
 
     @Override
@@ -818,10 +862,6 @@
                         getString(R.string.derived_app_name)), Toast.LENGTH_SHORT).show();
             }
         }
-        if (mLauncherCallbacks != null) {
-            mLauncherCallbacks.onRequestPermissionsResult(requestCode, permissions,
-                    grantResults);
-        }
     }
 
     /**
@@ -880,9 +920,12 @@
     protected void onStop() {
         super.onStop();
 
-        if (mLauncherCallbacks != null) {
-            mLauncherCallbacks.onStop();
+        if (mDeferOverlayCallbacks) {
+            checkIfOverlayStillDeferred();
+        } else {
+            mOverlayManager.onActivityStopped(this);
         }
+
         logStopAndResume(Action.Command.STOP);
 
         mAppWidgetHost.setListenIfResumed(false);
@@ -900,9 +943,10 @@
     protected void onStart() {
         RaceConditionTracker.onEvent(ON_START_EVT, ENTER);
         super.onStart();
-        if (mLauncherCallbacks != null) {
-            mLauncherCallbacks.onStart();
+        if (!mDeferOverlayCallbacks) {
+            mOverlayManager.onActivityStarted(this);
         }
+
         mAppWidgetHost.setListenIfResumed(true);
         RaceConditionTracker.onEvent(ON_START_EVT, EXIT);
     }
@@ -944,15 +988,50 @@
         } else {
             getUserEventDispatcher().logActionCommand(command, containerType, -1);
         }
+    }
 
+    private void scheduleDeferredCheck() {
+        mHandler.removeCallbacks(mDeferredOverlayCallbacks);
+        postAsyncCallback(mHandler, mDeferredOverlayCallbacks);
+    }
+
+    private void checkIfOverlayStillDeferred() {
+        if (!mDeferOverlayCallbacks) {
+            return;
+        }
+        if (isStarted() && (!hasBeenResumed() || mStateManager.getState().disableInteraction)) {
+            return;
+        }
+        mDeferOverlayCallbacks = false;
+
+        // Move the client to the correct state. Calling the same method twice is no-op.
+        if (isStarted()) {
+            mOverlayManager.onActivityStarted(this);
+        }
+        if (hasBeenResumed()) {
+            mOverlayManager.onActivityResumed(this);
+        } else {
+            mOverlayManager.onActivityPaused(this);
+        }
+        if (!isStarted()) {
+            mOverlayManager.onActivityStopped(this);
+        }
+    }
+
+    public void deferOverlayCallbacksUntilNextResumeOrStop() {
+        mDeferOverlayCallbacks = true;
+    }
+
+    public LauncherOverlayManager getOverlayManager() {
+        return mOverlayManager;
     }
 
     public void onStateSetStart(LauncherState state) {
         if (mDeferredResumePending) {
             handleDeferredResume();
         }
-        if (mLauncherCallbacks != null) {
-            mLauncherCallbacks.onStateChanged();
+        if (mDeferOverlayCallbacks) {
+            scheduleDeferredCheck();
         }
     }
 
@@ -981,8 +1060,10 @@
             resumeCallbacks.clear();
         }
 
-        if (mLauncherCallbacks != null) {
-            mLauncherCallbacks.onResume();
+        if (mDeferOverlayCallbacks) {
+            scheduleDeferredCheck();
+        } else {
+            mOverlayManager.onActivityResumed(this);
         }
 
         TraceHelper.endSection("ON_RESUME");
@@ -998,8 +1079,9 @@
         mDragController.cancelDrag();
         mDragController.resetLastGestureUpTime();
         mDropTargetBar.animateToVisibility(false);
-        if (mLauncherCallbacks != null) {
-            mLauncherCallbacks.onPause();
+
+        if (!mDeferOverlayCallbacks) {
+            mOverlayManager.onActivityPaused(this);
         }
     }
 
@@ -1015,35 +1097,6 @@
         mStateManager.onWindowFocusChanged();
     }
 
-    public interface LauncherOverlay {
-
-        /**
-         * Touch interaction leading to overscroll has begun
-         */
-        void onScrollInteractionBegin();
-
-        /**
-         * Touch interaction related to overscroll has ended
-         */
-        void onScrollInteractionEnd();
-
-        /**
-         * Scroll progress, between 0 and 100, when the user scrolls beyond the leftmost
-         * screen (or in the case of RTL, the rightmost screen).
-         */
-        void onScrollChange(float progress, boolean rtl);
-
-        /**
-         * Called when the launcher is ready to use the overlay
-         * @param callbacks A set of callbacks provided by Launcher in relation to the overlay
-         */
-        void setOverlayCallbacks(LauncherOverlayCallbacks callbacks);
-    }
-
-    public interface LauncherOverlayCallbacks {
-        void onScrollChanged(float progress);
-    }
-
     class LauncherOverlayCallbacksImpl implements LauncherOverlayCallbacks {
 
         public void onScrollChanged(float progress) {
@@ -1301,19 +1354,14 @@
     @Override
     public void onAttachedToWindow() {
         super.onAttachedToWindow();
-
-        if (mLauncherCallbacks != null) {
-            mLauncherCallbacks.onAttachedToWindow();
-        }
+        mOverlayManager.onAttachedToWindow();
     }
 
     @Override
     public void onDetachedFromWindow() {
         super.onDetachedFromWindow();
-
-        if (mLauncherCallbacks != null) {
-            mLauncherCallbacks.onDetachedFromWindow();
-        }
+        mOverlayManager.onDetachedFromWindow();
+        closeContextMenu();
     }
 
     public AllAppsTransitionController getAllAppsController() {
@@ -1362,10 +1410,16 @@
         return mModelWriter;
     }
 
+    @Override
     public SharedPreferences getSharedPrefs() {
         return mSharedPrefs;
     }
 
+    @Override
+    public SharedPreferences getDevicePrefs() {
+        return Utilities.getDevicePrefs(this);
+    }
+
     public int getOrientation() {
         return mOldConfig.orientation;
     }
@@ -1422,6 +1476,7 @@
             if (mLauncherCallbacks != null) {
                 mLauncherCallbacks.onHomeIntent(internalStateHandled);
             }
+            mOverlayManager.hideOverlay(isStarted() && !isForceInvisible());
         }
 
         TraceHelper.endSection("NEW_INTENT");
@@ -1467,10 +1522,7 @@
         }
 
         super.onSaveInstanceState(outState);
-
-        if (mLauncherCallbacks != null) {
-            mLauncherCallbacks.onSaveInstanceState(outState);
-        }
+        mOverlayManager.onActivitySaveInstanceState(this, outState);
     }
 
     @Override
@@ -1479,6 +1531,7 @@
 
         unregisterReceiver(mScreenOffReceiver);
         mWorkspace.removeFolderListeners();
+        PluginManagerWrapper.INSTANCE.get(this).removePluginListener(this);
 
         if (mCancelTouchController != null) {
             mCancelTouchController.run();
@@ -1503,9 +1556,8 @@
         TextKeyListener.getInstance().release();
         clearPendingBinds();
         LauncherAppState.getIDP(this).removeOnChangeListener(this);
-        if (mLauncherCallbacks != null) {
-            mLauncherCallbacks.onDestroy();
-        }
+
+        mOverlayManager.onActivityDestroyed(this);
     }
 
     public LauncherAccessibilityDelegate getAccessibilityDelegate() {
@@ -1666,10 +1718,9 @@
         } else {
             // In this case, we either need to start an activity to get permission to bind
             // the widget, or we need to start an activity to configure the widget, or both.
-            if (FeatureFlags.ENABLE_CUSTOM_WIDGETS &&
-                    info.itemType == LauncherSettings.Favorites.ITEM_TYPE_CUSTOM_APPWIDGET) {
-                appWidgetId = CustomWidgetParser.getWidgetIdForCustomProvider(
-                        this, info.componentName);
+            if (info.itemType == LauncherSettings.Favorites.ITEM_TYPE_CUSTOM_APPWIDGET) {
+                appWidgetId = CustomWidgetManager.INSTANCE.get(this).getWidgetIdForCustomProvider(
+                        info.componentName);
             } else {
                 appWidgetId = getAppWidgetHost().allocateAppWidgetId();
             }
@@ -1752,9 +1803,6 @@
         if (finishAutoCancelActionMode()) {
             return;
         }
-        if (mLauncherCallbacks != null && mLauncherCallbacks.handleBackPressed()) {
-            return;
-        }
 
         if (mDragController.isDragging()) {
             mDragController.cancelDrag();
@@ -1879,9 +1927,6 @@
             // This clears all widget bitmaps from the widget tray
             // TODO(hyunyoungs)
         }
-        if (mLauncherCallbacks != null) {
-            mLauncherCallbacks.onTrimMemory(level);
-        }
         UiFactory.onTrimMemory(this, level);
     }
 
@@ -2501,6 +2546,7 @@
         if (mLauncherCallbacks != null) {
             mLauncherCallbacks.dump(prefix, fd, writer, args);
         }
+        mOverlayManager.dump(prefix, writer);
     }
 
     @Override
diff --git a/src/com/android/launcher3/LauncherAppState.java b/src/com/android/launcher3/LauncherAppState.java
index b4a2216..d70abc2 100644
--- a/src/com/android/launcher3/LauncherAppState.java
+++ b/src/com/android/launcher3/LauncherAppState.java
@@ -37,6 +37,7 @@
 import com.android.launcher3.util.MainThreadInitializedObject;
 import com.android.launcher3.util.Preconditions;
 import com.android.launcher3.util.SecureSettingsObserver;
+import com.android.launcher3.widget.custom.CustomWidgetManager;
 
 public class LauncherAppState {
 
@@ -149,6 +150,8 @@
     LauncherModel setLauncher(Launcher launcher) {
         getLocalProvider(mContext).setLauncherProviderChangeListener(launcher);
         mModel.initialize(launcher);
+        CustomWidgetManager.INSTANCE.get(launcher)
+                .setWidgetRefreshCallback(mModel::refreshAndBindWidgetsAndShortcuts);
         return mModel;
     }
 
diff --git a/src/com/android/launcher3/LauncherAppWidgetHost.java b/src/com/android/launcher3/LauncherAppWidgetHost.java
index 80c5c3e..72daac5 100644
--- a/src/com/android/launcher3/LauncherAppWidgetHost.java
+++ b/src/com/android/launcher3/LauncherAppWidgetHost.java
@@ -27,12 +27,12 @@
 import android.content.Intent;
 import android.os.Handler;
 import android.util.SparseArray;
-import android.view.LayoutInflater;
 import android.widget.Toast;
 
-import com.android.launcher3.config.FeatureFlags;
+import com.android.launcher3.model.WidgetsModel;
 import com.android.launcher3.widget.DeferredAppWidgetHostView;
 import com.android.launcher3.widget.LauncherAppWidgetHostView;
+import com.android.launcher3.widget.custom.CustomWidgetManager;
 
 import java.util.ArrayList;
 import java.util.function.IntConsumer;
@@ -80,7 +80,7 @@
 
     @Override
     public void startListening() {
-        if (FeatureFlags.GO_DISABLE_WIDGETS) {
+        if (WidgetsModel.GO_DISABLE_WIDGETS) {
             return;
         }
         mFlags |= FLAG_LISTENING;
@@ -107,7 +107,7 @@
 
     @Override
     public void stopListening() {
-        if (FeatureFlags.GO_DISABLE_WIDGETS) {
+        if (WidgetsModel.GO_DISABLE_WIDGETS) {
             return;
         }
         mFlags &= ~FLAG_LISTENING;
@@ -166,7 +166,7 @@
 
     @Override
     public int allocateAppWidgetId() {
-        if (FeatureFlags.GO_DISABLE_WIDGETS) {
+        if (WidgetsModel.GO_DISABLE_WIDGETS) {
             return AppWidgetManager.INVALID_APPWIDGET_ID;
         }
 
@@ -193,10 +193,8 @@
             LauncherAppWidgetProviderInfo appWidget) {
         if (appWidget.isCustomWidget()) {
             LauncherAppWidgetHostView lahv = new LauncherAppWidgetHostView(context);
-            LayoutInflater inflater = (LayoutInflater)
-                    context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
-            inflater.inflate(appWidget.initialLayout, lahv);
             lahv.setAppWidget(0, appWidget);
+            CustomWidgetManager.INSTANCE.get(context).onViewCreated(lahv);
             return lahv;
         } else if ((mFlags & FLAG_LISTENING) == 0) {
             DeferredAppWidgetHostView view = new DeferredAppWidgetHostView(context);
@@ -262,7 +260,7 @@
     public void startBindFlow(BaseActivity activity,
             int appWidgetId, AppWidgetProviderInfo info, int requestCode) {
 
-        if (FeatureFlags.GO_DISABLE_WIDGETS) {
+        if (WidgetsModel.GO_DISABLE_WIDGETS) {
             sendActionCancelled(activity, requestCode);
             return;
         }
@@ -278,7 +276,7 @@
 
 
     public void startConfigActivity(BaseActivity activity, int widgetId, int requestCode) {
-        if (FeatureFlags.GO_DISABLE_WIDGETS) {
+        if (WidgetsModel.GO_DISABLE_WIDGETS) {
             sendActionCancelled(activity, requestCode);
             return;
         }
diff --git a/src/com/android/launcher3/LauncherCallbacks.java b/src/com/android/launcher3/LauncherCallbacks.java
index dfe75ec..0e529bd 100644
--- a/src/com/android/launcher3/LauncherCallbacks.java
+++ b/src/com/android/launcher3/LauncherCallbacks.java
@@ -16,7 +16,6 @@
 
 package com.android.launcher3;
 
-import android.content.Intent;
 import android.os.Bundle;
 
 import java.io.FileDescriptor;
@@ -36,31 +35,8 @@
      * the code in the corresponding Launcher method is executed.
      */
     void onCreate(Bundle savedInstanceState);
-    void onResume();
-    void onStart();
-    void onStop();
-    void onPause();
-    void onDestroy();
-    void onSaveInstanceState(Bundle outState);
-    void onActivityResult(int requestCode, int resultCode, Intent data);
-    void onRequestPermissionsResult(int requestCode, String[] permissions,
-            int[] grantResults);
-    void onAttachedToWindow();
-    void onDetachedFromWindow();
     void dump(String prefix, FileDescriptor fd, PrintWriter w, String[] args);
     void onHomeIntent(boolean internalStateHandled);
-    boolean handleBackPressed();
-    void onTrimMemory(int level);
-
-    /**
-     * Called when the launcher state changed
-     */
-    default void onStateChanged() { }
-
-    /*
-     * Extension points for providing custom behavior on certain user interactions.
-     */
-    void onLauncherProviderChange();
 
     /**
      * Starts a search with {@param initialQuery}. Return false if search was not started.
diff --git a/src/com/android/launcher3/LauncherModel.java b/src/com/android/launcher3/LauncherModel.java
index 7323c58..8433a91 100644
--- a/src/com/android/launcher3/LauncherModel.java
+++ b/src/com/android/launcher3/LauncherModel.java
@@ -22,7 +22,6 @@
 import static com.android.launcher3.util.Executors.MODEL_EXECUTOR;
 
 import android.content.BroadcastReceiver;
-import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
 import android.content.pm.ShortcutInfo;
@@ -53,10 +52,6 @@
 import com.android.launcher3.model.ShortcutsChangedTask;
 import com.android.launcher3.model.UserLockStateChangedTask;
 import com.android.launcher3.shortcuts.DeepShortcutManager;
-import com.android.launcher3.util.ComponentKey;
-import com.android.launcher3.util.IntArray;
-import com.android.launcher3.util.IntSparseArrayMap;
-import com.android.launcher3.util.ItemInfoMatcher;
 import com.android.launcher3.util.PackageUserKey;
 import com.android.launcher3.util.Preconditions;
 import com.android.launcher3.util.Thunk;
@@ -175,30 +170,6 @@
         enqueueModelUpdateTask(new PackageUpdatedTask(op, user, packageName));
     }
 
-    public void onSessionFailure(String packageName, UserHandle user) {
-        enqueueModelUpdateTask(new BaseModelUpdateTask() {
-            @Override
-            public void execute(LauncherAppState app, BgDataModel dataModel, AllAppsList apps) {
-                final IntSparseArrayMap<Boolean> removedIds = new IntSparseArrayMap<>();
-                synchronized (dataModel) {
-                    for (ItemInfo info : dataModel.itemsIdMap) {
-                        if (info instanceof WorkspaceItemInfo
-                                && ((WorkspaceItemInfo) info).hasPromiseIconUi()
-                                && user.equals(info.user)
-                                && info.getIntent() != null
-                                && TextUtils.equals(packageName, info.getIntent().getPackage())) {
-                            removedIds.put(info.id, false /* unused value */);
-                        }
-                    }
-                }
-
-                if (!removedIds.isEmpty()) {
-                    deleteAndBindComponentsRemoved(ItemInfoMatcher.ofItemIds(removedIds, false));
-                }
-            }
-        });
-    }
-
     @Override
     public void onPackageRemoved(String packageName, UserHandle user) {
         onPackagesRemoved(user, packageName);
@@ -552,5 +523,4 @@
     public Callbacks getCallback() {
         return mCallbacks != null ? mCallbacks.get() : null;
     }
-
 }
diff --git a/src/com/android/launcher3/LauncherProvider.java b/src/com/android/launcher3/LauncherProvider.java
index 6081300..d78c1b3 100644
--- a/src/com/android/launcher3/LauncherProvider.java
+++ b/src/com/android/launcher3/LauncherProvider.java
@@ -223,7 +223,6 @@
         mOpenHelper.onAddOrDeleteOp(db);
 
         uri = ContentUris.withAppendedId(uri, rowId);
-        notifyListeners();
         reloadLauncherIfExternal();
         return uri;
     }
@@ -283,7 +282,6 @@
             t.commit();
         }
 
-        notifyListeners();
         reloadLauncherIfExternal();
         return values.length;
     }
@@ -329,7 +327,6 @@
         int count = db.delete(args.table, args.where, args.args);
         if (count > 0) {
             mOpenHelper.onAddOrDeleteOp(db);
-            notifyListeners();
             reloadLauncherIfExternal();
         }
         return count;
@@ -343,8 +340,6 @@
         addModifiedTime(values);
         SQLiteDatabase db = mOpenHelper.getWritableDatabase();
         int count = db.update(args.table, values, args.where, args.args);
-        if (count > 0) notifyListeners();
-
         reloadLauncherIfExternal();
         return count;
     }
@@ -438,13 +433,6 @@
         }
     }
 
-    /**
-     * Overridden in tests
-     */
-    protected void notifyListeners() {
-        mListenerHandler.sendEmptyMessage(ChangeListenerWrapper.MSG_LAUNCHER_PROVIDER_CHANGED);
-    }
-
     @Thunk static void addModifiedTime(ContentValues values) {
         values.put(LauncherSettings.Favorites.MODIFIED, System.currentTimeMillis());
     }
@@ -1042,7 +1030,6 @@
 
     private static class ChangeListenerWrapper implements Handler.Callback {
 
-        private static final int MSG_LAUNCHER_PROVIDER_CHANGED = 1;
         private static final int MSG_APP_WIDGET_HOST_RESET = 2;
 
         private LauncherProviderChangeListener mListener;
@@ -1051,9 +1038,6 @@
         public boolean handleMessage(Message msg) {
             if (mListener != null) {
                 switch (msg.what) {
-                    case MSG_LAUNCHER_PROVIDER_CHANGED:
-                        mListener.onLauncherProviderChanged();
-                        break;
                     case MSG_APP_WIDGET_HOST_RESET:
                         mListener.onAppWidgetHostReset();
                         break;
diff --git a/src/com/android/launcher3/LauncherProviderChangeListener.java b/src/com/android/launcher3/LauncherProviderChangeListener.java
index 0243088..6afe885 100644
--- a/src/com/android/launcher3/LauncherProviderChangeListener.java
+++ b/src/com/android/launcher3/LauncherProviderChangeListener.java
@@ -7,7 +7,5 @@
  */
 public interface LauncherProviderChangeListener {
 
-    void onLauncherProviderChanged();
-
     void onAppWidgetHostReset();
 }
diff --git a/src/com/android/launcher3/LauncherSettings.java b/src/com/android/launcher3/LauncherSettings.java
index 242e099..c509680 100644
--- a/src/com/android/launcher3/LauncherSettings.java
+++ b/src/com/android/launcher3/LauncherSettings.java
@@ -59,6 +59,10 @@
         public static final String ITEM_TYPE = "itemType";
 
         /**
+         * The gesture is a package
+         */
+        public static final int ITEM_TYPE_NON_ACTIONABLE = -1;
+        /**
          * The gesture is an application
          */
         public static final int ITEM_TYPE_APPLICATION = 0;
diff --git a/src/com/android/launcher3/WidgetPreviewLoader.java b/src/com/android/launcher3/WidgetPreviewLoader.java
index 003bcc1..abf6cbd 100644
--- a/src/com/android/launcher3/WidgetPreviewLoader.java
+++ b/src/com/android/launcher3/WidgetPreviewLoader.java
@@ -30,6 +30,7 @@
 import android.os.UserHandle;
 import android.util.Log;
 import android.util.LongSparseArray;
+import android.util.Pair;
 
 import androidx.annotation.Nullable;
 
@@ -289,14 +290,25 @@
         return null;
     }
 
-    private Bitmap generatePreview(BaseActivity launcher, WidgetItem item, Bitmap recycle,
+    /**
+     * Returns generatedPreview for a widget and if the preview should be saved in persistent
+     * storage.
+     * @param launcher
+     * @param item
+     * @param recycle
+     * @param previewWidth
+     * @param previewHeight
+     * @return Pair<Bitmap, Boolean>
+     */
+    private Pair<Bitmap, Boolean> generatePreview(BaseActivity launcher, WidgetItem item,
+            Bitmap recycle,
             int previewWidth, int previewHeight) {
         if (item.widgetInfo != null) {
             return generateWidgetPreview(launcher, item.widgetInfo,
                     previewWidth, recycle, null);
         } else {
-            return generateShortcutPreview(launcher, item.activityInfo,
-                    previewWidth, previewHeight, recycle);
+            return new Pair<>(generateShortcutPreview(launcher, item.activityInfo,
+                    previewWidth, previewHeight, recycle), false);
         }
     }
 
@@ -309,9 +321,10 @@
      * @param maxPreviewWidth             width of the preview on either workspace or tray
      * @param preview                     bitmap that can be recycled
      * @param preScaledWidthOut           return the width of the returned bitmap
-     * @return
+     * @return Pair<Bitmap (the preview) , Boolean (should be stored in db)>
      */
-    public Bitmap generateWidgetPreview(BaseActivity launcher, LauncherAppWidgetProviderInfo info,
+    public Pair<Bitmap, Boolean> generateWidgetPreview(BaseActivity launcher,
+            LauncherAppWidgetProviderInfo info,
             int maxPreviewWidth, Bitmap preview, int[] preScaledWidthOut) {
         // Load the preview image if possible
         if (maxPreviewWidth < 0) maxPreviewWidth = Integer.MAX_VALUE;
@@ -341,6 +354,8 @@
         int previewWidth;
         int previewHeight;
 
+        boolean savePreviewImage = widgetPreviewExists || info.previewImage == 0;
+
         if (widgetPreviewExists && drawable.getIntrinsicWidth() > 0
                 && drawable.getIntrinsicHeight() > 0) {
             previewWidth = drawable.getIntrinsicWidth();
@@ -427,10 +442,12 @@
                     icon.setBounds(hoffset, yoffset, hoffset + iconSize, yoffset + iconSize);
                     icon.draw(c);
                 }
-            } catch (Resources.NotFoundException e) { }
+            } catch (Resources.NotFoundException e) {
+                savePreviewImage = false;
+            }
             c.setBitmap(null);
         }
-        return preview;
+        return new Pair<>(preview, savePreviewImage);
     }
 
     private RectF drawBoxWithShadow(Canvas c, int width, int height) {
@@ -533,6 +550,8 @@
         @Thunk long[] mVersions;
         @Thunk Bitmap mBitmapToRecycle;
 
+        private boolean mSaveToDB = false;
+
         PreviewLoadTask(WidgetCacheKey key, WidgetItem info, int previewWidth,
                 int previewHeight, WidgetCell caller) {
             mKey = key;
@@ -588,7 +607,10 @@
                         : null;
 
                 // it's not in the db... we need to generate it
-                preview = generatePreview(mActivity, mInfo, unusedBitmap, mPreviewWidth, mPreviewHeight);
+                Pair<Bitmap, Boolean> pair = generatePreview(mActivity, mInfo, unusedBitmap,
+                        mPreviewWidth, mPreviewHeight);
+                preview = pair.first;
+                this.mSaveToDB = pair.second;
             }
             return preview;
         }
@@ -602,7 +624,7 @@
                 MODEL_EXECUTOR.post(new Runnable() {
                     @Override
                     public void run() {
-                        if (!isCancelled()) {
+                        if (!isCancelled() && mSaveToDB) {
                             // If we are still using this preview, then write it to the DB and then
                             // let the normal clear mechanism recycle the bitmap
                             writeToDb(mKey, mVersions, preview);
diff --git a/src/com/android/launcher3/Workspace.java b/src/com/android/launcher3/Workspace.java
index f9201d0..98c67e2 100644
--- a/src/com/android/launcher3/Workspace.java
+++ b/src/com/android/launcher3/Workspace.java
@@ -60,7 +60,6 @@
 import android.view.accessibility.AccessibilityNodeInfo;
 import android.widget.Toast;
 
-import com.android.launcher3.Launcher.LauncherOverlay;
 import com.android.launcher3.LauncherAppWidgetHost.ProviderChangedListener;
 import com.android.launcher3.LauncherStateManager.AnimationConfig;
 import com.android.launcher3.accessibility.AccessibleDragListenerAdapter;
@@ -101,6 +100,7 @@
 import com.android.launcher3.widget.PendingAddShortcutInfo;
 import com.android.launcher3.widget.PendingAddWidgetInfo;
 import com.android.launcher3.widget.PendingAppWidgetHostView;
+import com.android.systemui.plugins.shared.LauncherOverlayManager.LauncherOverlay;
 
 import java.util.ArrayList;
 import java.util.HashSet;
@@ -965,6 +965,9 @@
         onOverlayScrollChanged(0);
     }
 
+    public boolean hasOverlay() {
+        return mLauncherOverlay != null;
+    }
 
     private boolean isScrollingOverlay() {
         return mLauncherOverlay != null &&
diff --git a/src/com/android/launcher3/allapps/AllAppsContainerView.java b/src/com/android/launcher3/allapps/AllAppsContainerView.java
index 293b867..a6d3747 100644
--- a/src/com/android/launcher3/allapps/AllAppsContainerView.java
+++ b/src/com/android/launcher3/allapps/AllAppsContainerView.java
@@ -26,7 +26,6 @@
 import android.text.Selection;
 import android.text.SpannableStringBuilder;
 import android.util.AttributeSet;
-import android.util.Log;
 import android.view.KeyEvent;
 import android.view.LayoutInflater;
 import android.view.MotionEvent;
@@ -45,11 +44,10 @@
 import com.android.launcher3.Launcher;
 import com.android.launcher3.LauncherState;
 import com.android.launcher3.R;
-import com.android.launcher3.testing.TestProtocol;
 import com.android.launcher3.Utilities;
 import com.android.launcher3.compat.AccessibilityManagerCompat;
-import com.android.launcher3.config.FeatureFlags;
 import com.android.launcher3.keyboard.FocusedItemDecorator;
+import com.android.launcher3.testing.TestProtocol;
 import com.android.launcher3.userevent.nano.LauncherLogProto.ContainerType;
 import com.android.launcher3.userevent.nano.LauncherLogProto.Target;
 import com.android.launcher3.util.ItemInfoMatcher;
@@ -163,16 +161,14 @@
     }
 
     private void onAppsUpdated() {
-        if (FeatureFlags.ALL_APPS_TABS_ENABLED) {
-            boolean hasWorkApps = false;
-            for (AppInfo app : mAllAppsStore.getApps()) {
-                if (mWorkMatcher.matches(app, null)) {
-                    hasWorkApps = true;
-                    break;
-                }
+        boolean hasWorkApps = false;
+        for (AppInfo app : mAllAppsStore.getApps()) {
+            if (mWorkMatcher.matches(app, null)) {
+                hasWorkApps = true;
+                break;
             }
-            rebindAdapters(hasWorkApps);
         }
+        rebindAdapters(hasWorkApps);
     }
 
     /**
diff --git a/src/com/android/launcher3/compat/AppWidgetManagerCompat.java b/src/com/android/launcher3/compat/AppWidgetManagerCompat.java
index 3243256..fc5d11c 100644
--- a/src/com/android/launcher3/compat/AppWidgetManagerCompat.java
+++ b/src/com/android/launcher3/compat/AppWidgetManagerCompat.java
@@ -23,19 +23,18 @@
 import android.os.Bundle;
 import android.os.UserHandle;
 
+import androidx.annotation.Nullable;
+
 import com.android.launcher3.LauncherAppWidgetInfo;
 import com.android.launcher3.LauncherAppWidgetProviderInfo;
 import com.android.launcher3.Utilities;
-import com.android.launcher3.config.FeatureFlags;
 import com.android.launcher3.util.ComponentKey;
 import com.android.launcher3.util.PackageUserKey;
-import com.android.launcher3.widget.custom.CustomWidgetParser;
+import com.android.launcher3.widget.custom.CustomWidgetManager;
 
 import java.util.HashMap;
 import java.util.List;
 
-import androidx.annotation.Nullable;
-
 public abstract class AppWidgetManagerCompat {
 
     private static final Object sInstanceLock = new Object();
@@ -63,11 +62,9 @@
     }
 
     public LauncherAppWidgetProviderInfo getLauncherAppWidgetInfo(int appWidgetId) {
-        if (FeatureFlags.ENABLE_CUSTOM_WIDGETS
-                && appWidgetId <= LauncherAppWidgetInfo.CUSTOM_WIDGET_ID) {
-            return CustomWidgetParser.getWidgetProvider(mContext, appWidgetId);
+        if (appWidgetId <= LauncherAppWidgetInfo.CUSTOM_WIDGET_ID) {
+            return CustomWidgetManager.INSTANCE.get(mContext).getWidgetProvider(appWidgetId);
         }
-
         AppWidgetProviderInfo info = mAppWidgetManager.getAppWidgetInfo(appWidgetId);
         return info == null ? null : LauncherAppWidgetProviderInfo.fromProviderInfo(mContext, info);
     }
diff --git a/src/com/android/launcher3/compat/AppWidgetManagerCompatVL.java b/src/com/android/launcher3/compat/AppWidgetManagerCompatVL.java
index 1065748..8f6500b 100644
--- a/src/com/android/launcher3/compat/AppWidgetManagerCompatVL.java
+++ b/src/com/android/launcher3/compat/AppWidgetManagerCompatVL.java
@@ -24,12 +24,15 @@
 import android.os.UserHandle;
 import android.os.UserManager;
 
+import androidx.annotation.Nullable;
+
 import com.android.launcher3.LauncherAppWidgetInfo;
 import com.android.launcher3.LauncherAppWidgetProviderInfo;
-import com.android.launcher3.config.FeatureFlags;
+import com.android.launcher3.model.WidgetsModel;
 import com.android.launcher3.util.ComponentKey;
 import com.android.launcher3.util.PackageUserKey;
-import com.android.launcher3.widget.custom.CustomWidgetParser;
+import com.android.launcher3.widget.custom.CustomAppWidgetProviderInfo;
+import com.android.launcher3.widget.custom.CustomWidgetManager;
 
 import java.util.ArrayList;
 import java.util.Collections;
@@ -37,8 +40,6 @@
 import java.util.Iterator;
 import java.util.List;
 
-import androidx.annotation.Nullable;
-
 class AppWidgetManagerCompatVL extends AppWidgetManagerCompat {
 
     private final UserManager mUserManager;
@@ -50,18 +51,15 @@
 
     @Override
     public List<AppWidgetProviderInfo> getAllProviders(@Nullable PackageUserKey packageUser) {
-        if (FeatureFlags.GO_DISABLE_WIDGETS) {
+        if (WidgetsModel.GO_DISABLE_WIDGETS) {
             return Collections.emptyList();
         }
         if (packageUser == null) {
-            ArrayList<AppWidgetProviderInfo> providers = new ArrayList<AppWidgetProviderInfo>();
+            ArrayList<AppWidgetProviderInfo> providers = new ArrayList<>();
             for (UserHandle user : mUserManager.getUserProfiles()) {
                 providers.addAll(mAppWidgetManager.getInstalledProvidersForProfile(user));
             }
-
-            if (FeatureFlags.ENABLE_CUSTOM_WIDGETS) {
-                providers.addAll(CustomWidgetParser.getCustomWidgets(mContext));
-            }
+            providers.addAll(getCustomWidgets());
             return providers;
         }
         // Only get providers for the given package/user.
@@ -74,9 +72,9 @@
             }
         }
 
-        if (FeatureFlags.ENABLE_CUSTOM_WIDGETS && Process.myUserHandle().equals(packageUser.mUser)
+        if (Process.myUserHandle().equals(packageUser.mUser)
                 && mContext.getPackageName().equals(packageUser.mPackageName)) {
-            providers.addAll(CustomWidgetParser.getCustomWidgets(mContext));
+            providers.addAll(getCustomWidgets());
         }
         return providers;
     }
@@ -84,12 +82,10 @@
     @Override
     public boolean bindAppWidgetIdIfAllowed(int appWidgetId, AppWidgetProviderInfo info,
             Bundle options) {
-        if (FeatureFlags.GO_DISABLE_WIDGETS) {
+        if (WidgetsModel.GO_DISABLE_WIDGETS) {
             return false;
         }
-
-        if (FeatureFlags.ENABLE_CUSTOM_WIDGETS
-                && appWidgetId <= LauncherAppWidgetInfo.CUSTOM_WIDGET_ID) {
+        if (appWidgetId <= LauncherAppWidgetInfo.CUSTOM_WIDGET_ID) {
             return true;
         }
         return mAppWidgetManager.bindAppWidgetIdIfAllowed(
@@ -98,7 +94,7 @@
 
     @Override
     public LauncherAppWidgetProviderInfo findProvider(ComponentName provider, UserHandle user) {
-        if (FeatureFlags.GO_DISABLE_WIDGETS) {
+        if (WidgetsModel.GO_DISABLE_WIDGETS) {
             return null;
         }
         for (AppWidgetProviderInfo info :
@@ -108,9 +104,8 @@
             }
         }
 
-        if (FeatureFlags.ENABLE_CUSTOM_WIDGETS && Process.myUserHandle().equals(user)) {
-            for (LauncherAppWidgetProviderInfo info :
-                    CustomWidgetParser.getCustomWidgets(mContext)) {
+        if (Process.myUserHandle().equals(user)) {
+            for (LauncherAppWidgetProviderInfo info : getCustomWidgets()) {
                 if (info.provider.equals(provider)) {
                     return info;
                 }
@@ -122,7 +117,7 @@
     @Override
     public HashMap<ComponentKey, AppWidgetProviderInfo> getAllProvidersMap() {
         HashMap<ComponentKey, AppWidgetProviderInfo> result = new HashMap<>();
-        if (FeatureFlags.GO_DISABLE_WIDGETS) {
+        if (WidgetsModel.GO_DISABLE_WIDGETS) {
             return result;
         }
         for (UserHandle user : mUserManager.getUserProfiles()) {
@@ -131,13 +126,13 @@
                 result.put(new ComponentKey(info.provider, user), info);
             }
         }
-
-        if (FeatureFlags.ENABLE_CUSTOM_WIDGETS) {
-            for (LauncherAppWidgetProviderInfo info :
-                    CustomWidgetParser.getCustomWidgets(mContext)) {
-                result.put(new ComponentKey(info.provider, info.getProfile()), info);
-            }
+        for (LauncherAppWidgetProviderInfo info : getCustomWidgets()) {
+            result.put(new ComponentKey(info.provider, info.getProfile()), info);
         }
         return result;
     }
+
+    List<CustomAppWidgetProviderInfo> getCustomWidgets() {
+        return CustomWidgetManager.INSTANCE.get(mContext).getCustomWidgets();
+    }
 }
diff --git a/src/com/android/launcher3/compat/AppWidgetManagerCompatVO.java b/src/com/android/launcher3/compat/AppWidgetManagerCompatVO.java
index b7b0563..2814afc 100644
--- a/src/com/android/launcher3/compat/AppWidgetManagerCompatVO.java
+++ b/src/com/android/launcher3/compat/AppWidgetManagerCompatVO.java
@@ -19,14 +19,14 @@
 import android.appwidget.AppWidgetProviderInfo;
 import android.content.Context;
 
-import com.android.launcher3.config.FeatureFlags;
+import androidx.annotation.Nullable;
+
+import com.android.launcher3.model.WidgetsModel;
 import com.android.launcher3.util.PackageUserKey;
 
 import java.util.Collections;
 import java.util.List;
 
-import androidx.annotation.Nullable;
-
 class AppWidgetManagerCompatVO extends AppWidgetManagerCompatVL {
 
     AppWidgetManagerCompatVO(Context context) {
@@ -35,7 +35,7 @@
 
     @Override
     public List<AppWidgetProviderInfo> getAllProviders(@Nullable PackageUserKey packageUser) {
-        if (FeatureFlags.GO_DISABLE_WIDGETS) {
+        if (WidgetsModel.GO_DISABLE_WIDGETS) {
             return Collections.emptyList();
         }
         if (packageUser == null) {
diff --git a/src/com/android/launcher3/compat/PackageInstallerCompatVL.java b/src/com/android/launcher3/compat/PackageInstallerCompatVL.java
index 2e22cba..09d9310 100644
--- a/src/com/android/launcher3/compat/PackageInstallerCompatVL.java
+++ b/src/com/android/launcher3/compat/PackageInstallerCompatVL.java
@@ -16,6 +16,7 @@
 
 package com.android.launcher3.compat;
 
+import static com.android.launcher3.Utilities.getPrefs;
 import static com.android.launcher3.util.Executors.MODEL_EXECUTOR;
 
 import android.content.Context;
@@ -28,12 +29,12 @@
 import android.text.TextUtils;
 import android.util.SparseArray;
 
+import com.android.launcher3.LauncherAppState;
 import com.android.launcher3.LauncherModel;
 import com.android.launcher3.SessionCommitReceiver;
 import com.android.launcher3.Utilities;
-import com.android.launcher3.icons.IconCache;
-import com.android.launcher3.LauncherAppState;
 import com.android.launcher3.config.FeatureFlags;
+import com.android.launcher3.icons.IconCache;
 import com.android.launcher3.util.IntArray;
 import com.android.launcher3.util.IntSet;
 import com.android.launcher3.util.PackageUserKey;
@@ -44,8 +45,6 @@
 import java.util.Iterator;
 import java.util.List;
 
-import static com.android.launcher3.Utilities.getPrefs;
-
 public class PackageInstallerCompatVL extends PackageInstallerCompat {
 
     private static final boolean DEBUG = false;
@@ -140,8 +139,6 @@
      * - The settings for it are enabled
      * - The user installed the app
      * - There is an app icon and label (For apps with no launching activity, no icon is provided).
-     * - The app is not already installed
-     * - A promise icon for the session has not already been created
      */
     private void tryQueuePromiseAppIcon(SessionInfo sessionInfo) {
         if (Utilities.ATLEAST_OREO && FeatureFlags.PROMISE_APPS_NEW_INSTALLS.get()
@@ -150,9 +147,7 @@
                 && sessionInfo.getInstallReason() == PackageManager.INSTALL_REASON_USER
                 && sessionInfo.getAppIcon() != null
                 && !TextUtils.isEmpty(sessionInfo.getAppLabel())
-                && !mPromiseIconIds.contains(sessionInfo.getSessionId())
-                && mLauncherApps.getApplicationInfo(sessionInfo.getAppPackageName(), 0,
-                        getUserHandle(sessionInfo)) == null) {
+                && !mPromiseIconIds.contains(sessionInfo.getSessionId())) {
             SessionCommitReceiver.queuePromiseAppIconAddition(mAppContext, sessionInfo);
             mPromiseIconIds.add(sessionInfo.getSessionId());
             updatePromiseIconPrefs();
@@ -164,7 +159,7 @@
         @Override
         public void onCreated(int sessionId) {
             SessionInfo sessionInfo = pushSessionDisplayToLauncher(sessionId);
-            if (FeatureFlags.LAUNCHER3_PROMISE_APPS_IN_ALL_APPS && sessionInfo != null) {
+            if (FeatureFlags.PROMISE_APPS_IN_ALL_APPS.get() && sessionInfo != null) {
                 LauncherAppState app = LauncherAppState.getInstanceNoCreate();
                 if (app != null) {
                     app.getModel().onInstallSessionCreated(
@@ -187,14 +182,12 @@
                 sendUpdate(PackageInstallInfo.fromState(success ? STATUS_INSTALLED : STATUS_FAILED,
                         packageName, key.mUser));
 
-                if (!success && FeatureFlags.PROMISE_APPS_NEW_INSTALLS.get()
-                        && mPromiseIconIds.contains(sessionId)) {
+                if (!success && FeatureFlags.PROMISE_APPS_NEW_INSTALLS.get()) {
                     LauncherAppState appState = LauncherAppState.getInstanceNoCreate();
                     if (appState != null) {
-                        appState.getModel().onSessionFailure(packageName, key.mUser);
+                        LauncherModel model = appState.getModel();
+                        model.onPackageRemoved(packageName, key.mUser);
                     }
-                    // If it is successful, the id is removed in the the package added flow.
-                    removePromiseIconId(sessionId);
                 }
             }
         }
diff --git a/src/com/android/launcher3/config/BaseFlags.java b/src/com/android/launcher3/config/FeatureFlags.java
similarity index 85%
rename from src/com/android/launcher3/config/BaseFlags.java
rename to src/com/android/launcher3/config/FeatureFlags.java
index 9455889..e6eced1 100644
--- a/src/com/android/launcher3/config/BaseFlags.java
+++ b/src/com/android/launcher3/config/FeatureFlags.java
@@ -23,11 +23,12 @@
 
 import androidx.annotation.GuardedBy;
 import androidx.annotation.Keep;
-
 import androidx.annotation.VisibleForTesting;
-import com.android.launcher3.Utilities;
 
+import com.android.launcher3.BuildConfig;
+import com.android.launcher3.Utilities;
 import com.android.launcher3.uioverrides.TogglableFlag;
+
 import java.util.ArrayList;
 import java.util.List;
 import java.util.SortedMap;
@@ -39,7 +40,7 @@
  * <p>All the flags should be defined here with appropriate default values.
  */
 @Keep
-public abstract class BaseFlags {
+public final class FeatureFlags {
 
     private static final Object sLock = new Object();
     @GuardedBy("sLock")
@@ -47,49 +48,47 @@
 
     static final String FLAGS_PREF_NAME = "featureFlags";
 
-    BaseFlags() {
-        throw new UnsupportedOperationException("Don't instantiate BaseFlags");
-    }
+    private FeatureFlags() { }
 
     public static boolean showFlagTogglerUi(Context context) {
         return Utilities.IS_DEBUG_DEVICE && Utilities.isDevelopersOptionsEnabled(context);
     }
 
-    public static final boolean IS_DOGFOOD_BUILD = false;
+    public static final boolean IS_DOGFOOD_BUILD = BuildConfig.DEBUG;
 
+    /**
+     * Enable moving the QSB on the 0th screen of the workspace. This is not a configuration feature
+     * and should be modified at a project level.
+     */
+    public static final boolean QSB_ON_FIRST_SCREEN = true;
+
+
+    /**
+     * Feature flag to handle define config changes dynamically instead of killing the process.
+     *
+     *
+     * To add a new flag that can be toggled through the flags UI:
+     *
+     * 1. Declare a new ToggleableFlag below. Give it a unique key (e.g. "QSB_ON_FIRST_SCREEN"),
+     *    and set a default value for the flag. This will be the default value on Debug builds.
+     *
+     * 2. Add your flag to mTogglableFlags.
+     *
+     * 3. Create a getter method (an 'is' method) for the flag by copying an existing one.
+     *
+     * 4. Create a getter method with the same name in the release flags copy of FeatureFlags.java.
+     *    This should returns a constant (true/false). This will be the value of the flag used on
+     *    release builds.
+     */
     // When enabled the promise icon is visible in all apps while installation an app.
-    public static final boolean LAUNCHER3_PROMISE_APPS_IN_ALL_APPS = false;
+    public static final TogglableFlag PROMISE_APPS_IN_ALL_APPS = new TogglableFlag(
+            "PROMISE_APPS_IN_ALL_APPS", false, "Add promise icon in all-apps");
 
     // When enabled a promise icon is added to the home screen when install session is active.
     public static final TogglableFlag PROMISE_APPS_NEW_INSTALLS =
             new TogglableFlag("PROMISE_APPS_NEW_INSTALLS", true,
                     "Adds a promise icon to the home screen for new install sessions.");
 
-    // Enable moving the QSB on the 0th screen of the workspace
-    public static final boolean QSB_ON_FIRST_SCREEN = true;
-
-    public static final TogglableFlag EXAMPLE_FLAG = new TogglableFlag("EXAMPLE_FLAG", true,
-            "An example flag that doesn't do anything. Useful for testing");
-
-    //Feature flag to enable pulling down navigation shade from workspace.
-    public static final boolean PULL_DOWN_STATUS_BAR = true;
-
-    // When true, custom widgets are loaded using CustomWidgetParser.
-    public static final boolean ENABLE_CUSTOM_WIDGETS = false;
-
-    // Features to control Launcher3Go behavior
-    public static final boolean GO_DISABLE_WIDGETS = false;
-
-    // When enabled shows a work profile tab in all apps
-    public static final boolean ALL_APPS_TABS_ENABLED = true;
-
-    // When true, overview shows screenshots in the orientation they were taken rather than
-    // trying to make them fit the orientation the device is in.
-    public static final boolean OVERVIEW_USE_SCREENSHOT_ORIENTATION = true;
-
-    /**
-     * Feature flag to handle define config changes dynamically instead of killing the process.
-     */
     public static final TogglableFlag APPLY_CONFIG_AT_RUNTIME = new TogglableFlag(
             "APPLY_CONFIG_AT_RUNTIME", true, "Apply display changes dynamically");
 
@@ -133,13 +132,13 @@
     static List<TogglableFlag> getTogglableFlags() {
         // By Java Language Spec 12.4.2
         // https://docs.oracle.com/javase/specs/jls/se7/html/jls-12.html#jls-12.4.2, the
-        // TogglableFlag instances on BaseFlags will be created before those on the FeatureFlags
+        // TogglableFlag instances on FeatureFlags will be created before those on the FeatureFlags
         // subclass. This code handles flags that are redeclared in FeatureFlags, ensuring the
         // FeatureFlags one takes priority.
         SortedMap<String, TogglableFlag> flagsByKey = new TreeMap<>();
         synchronized (sLock) {
             for (TogglableFlag flag : sFlags) {
-                flagsByKey.put(((BaseTogglableFlag) flag).getKey(), flag);
+                flagsByKey.put(flag.getKey(), flag);
             }
         }
         return new ArrayList<>(flagsByKey.values());
diff --git a/src/com/android/launcher3/config/FlagTogglerPrefUi.java b/src/com/android/launcher3/config/FlagTogglerPrefUi.java
index 54e5322..200938d 100644
--- a/src/com/android/launcher3/config/FlagTogglerPrefUi.java
+++ b/src/com/android/launcher3/config/FlagTogglerPrefUi.java
@@ -26,13 +26,13 @@
 import android.widget.Toast;
 
 import com.android.launcher3.R;
+import com.android.launcher3.config.FeatureFlags.BaseTogglableFlag;
+import com.android.launcher3.uioverrides.TogglableFlag;
 
 import androidx.preference.PreferenceDataStore;
 import androidx.preference.PreferenceFragment;
 import androidx.preference.PreferenceGroup;
 import androidx.preference.SwitchPreference;
-import com.android.launcher3.config.BaseFlags.BaseTogglableFlag;
-import com.android.launcher3.uioverrides.TogglableFlag;
 
 /**
  * Dev-build only UI allowing developers to toggle flag settings. See {@link FeatureFlags}.
diff --git a/src/com/android/launcher3/dragndrop/FlingToDeleteHelper.java b/src/com/android/launcher3/dragndrop/FlingToDeleteHelper.java
index 589ad25..06b5c40 100644
--- a/src/com/android/launcher3/dragndrop/FlingToDeleteHelper.java
+++ b/src/com/android/launcher3/dragndrop/FlingToDeleteHelper.java
@@ -106,6 +106,7 @@
      * @return the vector at which the item was flung, or null if no fling was detected.
      */
     private PointF isFlingingToDelete() {
+        if (mVelocityTracker == null) return null;
         if (mDropTarget == null) {
             mDropTarget = (ButtonDropTarget) mLauncher.findViewById(R.id.delete_target_text);
         }
diff --git a/src/com/android/launcher3/model/LoaderTask.java b/src/com/android/launcher3/model/LoaderTask.java
index c3f5bc7..63b451d 100644
--- a/src/com/android/launcher3/model/LoaderTask.java
+++ b/src/com/android/launcher3/model/LoaderTask.java
@@ -582,7 +582,7 @@
                             break;
 
                         case LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET:
-                            if (FeatureFlags.GO_DISABLE_WIDGETS) {
+                            if (WidgetsModel.GO_DISABLE_WIDGETS) {
                                 c.markDeleted("Only legacy shortcuts can have null package");
                                 continue;
                             }
@@ -843,7 +843,7 @@
             allActivityList.addAll(apps);
         }
 
-        if (FeatureFlags.LAUNCHER3_PROMISE_APPS_IN_ALL_APPS) {
+        if (FeatureFlags.PROMISE_APPS_IN_ALL_APPS.get()) {
             // get all active sessions and add them to the all apps list
             for (PackageInstaller.SessionInfo info :
                     mPackageInstaller.getAllVerifiedSessions()) {
diff --git a/src/com/android/launcher3/model/PackageItemInfo.java b/src/com/android/launcher3/model/PackageItemInfo.java
index 741be66..3ef48cd 100644
--- a/src/com/android/launcher3/model/PackageItemInfo.java
+++ b/src/com/android/launcher3/model/PackageItemInfo.java
@@ -17,6 +17,7 @@
 package com.android.launcher3.model;
 
 import com.android.launcher3.ItemInfoWithIcon;
+import com.android.launcher3.LauncherSettings;
 
 /**
  * Represents a {@link Package} in the widget tray section.
@@ -30,10 +31,12 @@
 
     public PackageItemInfo(String packageName) {
         this.packageName = packageName;
+        this.itemType = LauncherSettings.Favorites.ITEM_TYPE_NON_ACTIONABLE;
     }
 
     public PackageItemInfo(PackageItemInfo copy) {
         this.packageName = copy.packageName;
+        this.itemType = LauncherSettings.Favorites.ITEM_TYPE_NON_ACTIONABLE;
     }
 
     @Override
diff --git a/src/com/android/launcher3/model/PackageUpdatedTask.java b/src/com/android/launcher3/model/PackageUpdatedTask.java
index e6a1a0b..5bfd6de 100644
--- a/src/com/android/launcher3/model/PackageUpdatedTask.java
+++ b/src/com/android/launcher3/model/PackageUpdatedTask.java
@@ -104,7 +104,7 @@
                 for (int i = 0; i < N; i++) {
                     if (DEBUG) Log.d(TAG, "mAllAppsList.addPackage " + packages[i]);
                     iconCache.updateIconsForPkg(packages[i], mUser);
-                    if (FeatureFlags.LAUNCHER3_PROMISE_APPS_IN_ALL_APPS) {
+                    if (FeatureFlags.PROMISE_APPS_IN_ALL_APPS.get()) {
                         appsList.removePackage(packages[i], mUser);
                     }
                     appsList.addPackage(context, packages[i], mUser);
diff --git a/src/com/android/launcher3/util/ShortcutUtil.java b/src/com/android/launcher3/util/ShortcutUtil.java
index af99713..49c97da 100644
--- a/src/com/android/launcher3/util/ShortcutUtil.java
+++ b/src/com/android/launcher3/util/ShortcutUtil.java
@@ -19,7 +19,7 @@
 import com.android.launcher3.LauncherSettings;
 import com.android.launcher3.Utilities;
 import com.android.launcher3.WorkspaceItemInfo;
-import com.android.launcher3.config.FeatureFlags;
+import com.android.launcher3.model.WidgetsModel;
 import com.android.launcher3.shortcuts.ShortcutKey;
 
 public class ShortcutUtil {
@@ -64,7 +64,7 @@
     private static boolean isActive(ItemInfo info) {
         boolean isLoading = info instanceof WorkspaceItemInfo
                 && ((WorkspaceItemInfo) info).hasPromiseIconUi();
-        return !isLoading && !info.isDisabled() && !FeatureFlags.GO_DISABLE_WIDGETS;
+        return !isLoading && !info.isDisabled() && !WidgetsModel.GO_DISABLE_WIDGETS;
     }
 
     private static boolean isApp(ItemInfo info) {
@@ -76,4 +76,4 @@
                 && info.container != ItemInfo.NO_ID
                 && info instanceof WorkspaceItemInfo;
     }
-}
\ No newline at end of file
+}
diff --git a/src/com/android/launcher3/views/OptionsPopupView.java b/src/com/android/launcher3/views/OptionsPopupView.java
index 465df44..88d34da 100644
--- a/src/com/android/launcher3/views/OptionsPopupView.java
+++ b/src/com/android/launcher3/views/OptionsPopupView.java
@@ -37,7 +37,7 @@
 import com.android.launcher3.Launcher;
 import com.android.launcher3.R;
 import com.android.launcher3.Utilities;
-import com.android.launcher3.config.FeatureFlags;
+import com.android.launcher3.model.WidgetsModel;
 import com.android.launcher3.popup.ArrowPopup;
 import com.android.launcher3.shortcuts.DeepShortcutView;
 import com.android.launcher3.userevent.nano.LauncherLogProto.Action;
@@ -158,7 +158,7 @@
                 R.drawable.ic_palette : R.drawable.ic_wallpaper;
         options.add(new OptionItem(resString, resDrawable,
                 ControlType.WALLPAPER_BUTTON, OptionsPopupView::startWallpaperPicker));
-        if (!FeatureFlags.GO_DISABLE_WIDGETS) {
+        if (!WidgetsModel.GO_DISABLE_WIDGETS) {
             options.add(new OptionItem(R.string.widget_button_text, R.drawable.ic_widget,
                     ControlType.WIDGETS_BUTTON, OptionsPopupView::onWidgetsClicked));
         }
diff --git a/src/com/android/launcher3/widget/PendingItemDragHelper.java b/src/com/android/launcher3/widget/PendingItemDragHelper.java
index 8ea9bd4..662e627 100644
--- a/src/com/android/launcher3/widget/PendingItemDragHelper.java
+++ b/src/com/android/launcher3/widget/PendingItemDragHelper.java
@@ -91,8 +91,8 @@
                         createWidgetInfo.info, maxWidth, previewSizeBeforeScale);
             }
             if (preview == null) {
-                preview = app.getWidgetCache().generateWidgetPreview(
-                        launcher, createWidgetInfo.info, maxWidth, null, previewSizeBeforeScale);
+                preview = app.getWidgetCache().generateWidgetPreview(launcher,
+                        createWidgetInfo.info, maxWidth, null, previewSizeBeforeScale).first;
             }
 
             if (previewSizeBeforeScale[0] < previewBitmapWidth) {
diff --git a/src/com/android/launcher3/widget/custom/CustomWidgetManager.java b/src/com/android/launcher3/widget/custom/CustomWidgetManager.java
new file mode 100644
index 0000000..cf3e26d
--- /dev/null
+++ b/src/com/android/launcher3/widget/custom/CustomWidgetManager.java
@@ -0,0 +1,163 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.launcher3.widget.custom;
+
+import static com.android.launcher3.LauncherAppWidgetProviderInfo.CLS_CUSTOM_WIDGET_PREFIX;
+
+import android.appwidget.AppWidgetManager;
+import android.appwidget.AppWidgetProviderInfo;
+import android.content.ComponentName;
+import android.content.Context;
+import android.os.Parcel;
+import android.os.Process;
+import android.util.SparseArray;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+import com.android.launcher3.LauncherAppWidgetInfo;
+import com.android.launcher3.LauncherAppWidgetProviderInfo;
+import com.android.launcher3.uioverrides.plugins.PluginManagerWrapper;
+import com.android.launcher3.util.MainThreadInitializedObject;
+import com.android.launcher3.util.PackageUserKey;
+import com.android.launcher3.widget.LauncherAppWidgetHostView;
+import com.android.systemui.plugins.CustomWidgetPlugin;
+import com.android.systemui.plugins.PluginListener;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.function.Consumer;
+
+/**
+ * CustomWidgetManager handles custom widgets implemented as a plugin.
+ */
+public class CustomWidgetManager implements PluginListener<CustomWidgetPlugin> {
+
+    public static final MainThreadInitializedObject<CustomWidgetManager> INSTANCE =
+            new MainThreadInitializedObject<>(CustomWidgetManager::new);
+
+    private final List<CustomWidgetPlugin> mPlugins;
+    private final List<CustomAppWidgetProviderInfo> mCustomWidgets;
+    private final SparseArray<ComponentName> mWidgetsIdMap;
+    private Consumer<PackageUserKey> mWidgetRefreshCallback;
+
+    private CustomWidgetManager(Context context) {
+        mPlugins = new ArrayList<>();
+        mCustomWidgets = new ArrayList<>();
+        mWidgetsIdMap = new SparseArray<>();
+        PluginManagerWrapper.INSTANCE.get(context)
+                .addPluginListener(this, CustomWidgetPlugin.class, true);
+    }
+
+    @Override
+    public void onPluginConnected(CustomWidgetPlugin plugin, Context context) {
+        mPlugins.add(plugin);
+        List<AppWidgetProviderInfo> providers = AppWidgetManager.getInstance(context)
+                .getInstalledProvidersForProfile(Process.myUserHandle());
+        if (providers.isEmpty()) return;
+        Parcel parcel = Parcel.obtain();
+        providers.get(0).writeToParcel(parcel, 0);
+        parcel.setDataPosition(0);
+        CustomAppWidgetProviderInfo info = newInfo(plugin, parcel, context);
+        parcel.recycle();
+        mCustomWidgets.add(info);
+        mWidgetsIdMap.put(plugin.getProviderId(), info.provider);
+        mWidgetRefreshCallback.accept(null);
+    }
+
+    @Override
+    public void onPluginDisconnected(CustomWidgetPlugin plugin) {
+        mPlugins.remove(plugin);
+        mCustomWidgets.remove(getWidgetProvider(plugin.getProviderId()));
+        mWidgetsIdMap.remove(plugin.getProviderId());
+    }
+
+    /**
+     * Inject a callback function to refresh the widgets.
+     */
+    public void setWidgetRefreshCallback(Consumer<PackageUserKey> cb) {
+        mWidgetRefreshCallback = cb;
+    }
+
+    /**
+     * Callback method to inform a plugin it's corresponding widget has been created.
+     */
+    public void onViewCreated(LauncherAppWidgetHostView view) {
+        CustomAppWidgetProviderInfo info = (CustomAppWidgetProviderInfo) view.getAppWidgetInfo();
+        CustomWidgetPlugin plugin = findPlugin(info.providerId);
+        if (plugin == null) return;
+        plugin.onViewCreated(view);
+    }
+
+    /**
+     * Returns the list of custom widgets.
+     */
+    @NonNull
+    public List<CustomAppWidgetProviderInfo> getCustomWidgets() {
+        return mCustomWidgets;
+    }
+
+    /**
+     * Returns the widget id for a specific provider.
+     */
+    public int getWidgetIdForCustomProvider(@NonNull ComponentName provider) {
+        int index = mWidgetsIdMap.indexOfValue(provider);
+        if (index >= 0) {
+            return LauncherAppWidgetInfo.CUSTOM_WIDGET_ID - mWidgetsIdMap.keyAt(index);
+        } else {
+            return AppWidgetManager.INVALID_APPWIDGET_ID;
+        }
+    }
+
+    /**
+     * Returns the widget provider in respect to given widget id.
+     */
+    @Nullable
+    public LauncherAppWidgetProviderInfo getWidgetProvider(int widgetId) {
+        ComponentName cn = mWidgetsIdMap.get(LauncherAppWidgetInfo.CUSTOM_WIDGET_ID - widgetId);
+        for (LauncherAppWidgetProviderInfo info : mCustomWidgets) {
+            if (info.provider.equals(cn)) return info;
+        }
+        return null;
+    }
+
+    private static CustomAppWidgetProviderInfo newInfo(
+            CustomWidgetPlugin plugin, Parcel parcel, Context context) {
+        int providerId = plugin.getProviderId();
+        CustomAppWidgetProviderInfo info = new CustomAppWidgetProviderInfo(
+                parcel, false, providerId);
+        info.provider = new ComponentName(
+                context.getPackageName(), CLS_CUSTOM_WIDGET_PREFIX + providerId);
+
+        info.label = plugin.getLabel();
+        info.icon = plugin.getIcon();
+        info.previewImage = plugin.getPreviewImage();
+        info.resizeMode = plugin.getResizeMode();
+
+        info.spanX = plugin.getSpanX();
+        info.spanY = plugin.getSpanY();
+        info.minSpanX = plugin.getMinSpanX();
+        info.minSpanY = plugin.getMinSpanY();
+        return info;
+    }
+
+    @Nullable
+    private CustomWidgetPlugin findPlugin(int providerId) {
+        return mPlugins.stream().filter((p) -> p.getProviderId() == providerId).findFirst()
+                .orElse(null);
+    }
+}
diff --git a/src/com/android/launcher3/widget/custom/CustomWidgetParser.java b/src/com/android/launcher3/widget/custom/CustomWidgetParser.java
deleted file mode 100644
index 00720c4..0000000
--- a/src/com/android/launcher3/widget/custom/CustomWidgetParser.java
+++ /dev/null
@@ -1,142 +0,0 @@
-/*
- * Copyright (C) 2017 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package com.android.launcher3.widget.custom;
-
-import android.appwidget.AppWidgetManager;
-import android.appwidget.AppWidgetProviderInfo;
-import android.content.ComponentName;
-import android.content.Context;
-import android.content.res.TypedArray;
-import android.content.res.XmlResourceParser;
-import android.os.Parcel;
-import android.os.Process;
-import android.util.SparseArray;
-import android.util.Xml;
-
-import com.android.launcher3.LauncherAppWidgetInfo;
-import com.android.launcher3.LauncherAppWidgetProviderInfo;
-import com.android.launcher3.R;
-
-import org.xmlpull.v1.XmlPullParser;
-import org.xmlpull.v1.XmlPullParserException;
-
-import java.io.IOException;
-import java.util.ArrayList;
-import java.util.List;
-
-import static com.android.launcher3.LauncherAppWidgetProviderInfo.CLS_CUSTOM_WIDGET_PREFIX;
-
-/**
- * Utility class to parse {@ink CustomAppWidgetProviderInfo} definitions from xml
- */
-public class CustomWidgetParser {
-
-    private static List<LauncherAppWidgetProviderInfo> sCustomWidgets;
-    private static SparseArray<ComponentName> sWidgetsIdMap;
-
-    public static List<LauncherAppWidgetProviderInfo> getCustomWidgets(Context context) {
-        if (sCustomWidgets == null) {
-            // Synchronization not needed as it it safe to load multiple times
-            parseCustomWidgets(context);
-        }
-
-        return sCustomWidgets;
-    }
-
-    public static int getWidgetIdForCustomProvider(Context context, ComponentName provider) {
-        if (sWidgetsIdMap == null) {
-            parseCustomWidgets(context);
-        }
-        int index = sWidgetsIdMap.indexOfValue(provider);
-        if (index >= 0) {
-            return LauncherAppWidgetInfo.CUSTOM_WIDGET_ID - sWidgetsIdMap.keyAt(index);
-        } else {
-            return AppWidgetManager.INVALID_APPWIDGET_ID;
-        }
-    }
-
-    public static LauncherAppWidgetProviderInfo getWidgetProvider(Context context, int widgetId) {
-        if (sWidgetsIdMap == null || sCustomWidgets == null) {
-            parseCustomWidgets(context);
-        }
-        ComponentName cn = sWidgetsIdMap.get(LauncherAppWidgetInfo.CUSTOM_WIDGET_ID - widgetId);
-        for (LauncherAppWidgetProviderInfo info : sCustomWidgets) {
-            if (info.provider.equals(cn)) {
-                return info;
-            }
-        }
-        return null;
-    }
-
-    private static void parseCustomWidgets(Context context) {
-        ArrayList<LauncherAppWidgetProviderInfo> widgets = new ArrayList<>();
-        SparseArray<ComponentName> idMap = new SparseArray<>();
-
-        List<AppWidgetProviderInfo> providers = AppWidgetManager.getInstance(context)
-                .getInstalledProvidersForProfile(Process.myUserHandle());
-        if (providers.isEmpty()) {
-            sCustomWidgets = widgets;
-            sWidgetsIdMap = idMap;
-            return;
-        }
-
-        Parcel parcel = Parcel.obtain();
-        providers.get(0).writeToParcel(parcel, 0);
-
-        try (XmlResourceParser parser = context.getResources().getXml(R.xml.custom_widgets)) {
-            final int depth = parser.getDepth();
-            int type;
-
-            while (((type = parser.next()) != XmlPullParser.END_TAG ||
-                    parser.getDepth() > depth) && type != XmlPullParser.END_DOCUMENT) {
-                if ((type == XmlPullParser.START_TAG) && "widget".equals(parser.getName())) {
-                    TypedArray a = context.obtainStyledAttributes(
-                            Xml.asAttributeSet(parser), R.styleable.CustomAppWidgetProviderInfo);
-
-                    parcel.setDataPosition(0);
-                    CustomAppWidgetProviderInfo info = newInfo(a, parcel, context);
-                    widgets.add(info);
-                    a.recycle();
-
-                    idMap.put(info.providerId, info.provider);
-                }
-            }
-        } catch (IOException | XmlPullParserException e) {
-            throw new RuntimeException(e);
-        }
-        parcel.recycle();
-        sCustomWidgets = widgets;
-        sWidgetsIdMap = idMap;
-    }
-
-    private static CustomAppWidgetProviderInfo newInfo(TypedArray a, Parcel parcel, Context context) {
-        int providerId = a.getInt(R.styleable.CustomAppWidgetProviderInfo_providerId, 0);
-        CustomAppWidgetProviderInfo info = new CustomAppWidgetProviderInfo(parcel, false, providerId);
-        info.provider = new ComponentName(context.getPackageName(), CLS_CUSTOM_WIDGET_PREFIX + providerId);
-
-        info.label = a.getString(R.styleable.CustomAppWidgetProviderInfo_android_label);
-        info.initialLayout = a.getResourceId(R.styleable.CustomAppWidgetProviderInfo_android_initialLayout, 0);
-        info.icon = a.getResourceId(R.styleable.CustomAppWidgetProviderInfo_android_icon, 0);
-        info.previewImage = a.getResourceId(R.styleable.CustomAppWidgetProviderInfo_android_previewImage, 0);
-        info.resizeMode = a.getInt(R.styleable.CustomAppWidgetProviderInfo_android_resizeMode, 0);
-
-        info.spanX = a.getInt(R.styleable.CustomAppWidgetProviderInfo_numColumns, 1);
-        info.spanY = a.getInt(R.styleable.CustomAppWidgetProviderInfo_numRows, 1);
-        info.minSpanX = a.getInt(R.styleable.CustomAppWidgetProviderInfo_numMinColumns, 1);
-        info.minSpanY = a.getInt(R.styleable.CustomAppWidgetProviderInfo_numMinRows, 1);
-        return info;
-    }
-}
diff --git a/src_build_config/BuildConfig.java b/src_build_config/BuildConfig.java
index 36d7f4b..49aadf6 100644
--- a/src_build_config/BuildConfig.java
+++ b/src_build_config/BuildConfig.java
@@ -18,4 +18,5 @@
 
 public final class BuildConfig {
   public static final String APPLICATION_ID = "com.android.launcher3";
+  public static final boolean DEBUG = false;
 }
diff --git a/src_flags/com/android/launcher3/config/FeatureFlags.java b/src_flags/com/android/launcher3/config/FeatureFlags.java
deleted file mode 100644
index 73c6996..0000000
--- a/src_flags/com/android/launcher3/config/FeatureFlags.java
+++ /dev/null
@@ -1,28 +0,0 @@
-/*
- * Copyright (C) 2015 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.launcher3.config;
-
-import android.content.Context;
-
-/**
- * Defines a set of flags used to control various launcher behaviors
- */
-public final class FeatureFlags extends BaseFlags {
-    private FeatureFlags() {
-        // Prevent instantiation
-    }
-}
diff --git a/src_plugins/com/android/systemui/plugins/AppLaunchEventsPlugin.java b/src_plugins/com/android/systemui/plugins/AppLaunchEventsPlugin.java
new file mode 100644
index 0000000..15a0ffa
--- /dev/null
+++ b/src_plugins/com/android/systemui/plugins/AppLaunchEventsPlugin.java
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.systemui.plugins;
+
+import android.content.ComponentName;
+import android.os.UserHandle;
+
+import com.android.systemui.plugins.annotations.ProvidesInterface;
+
+/**
+ * Plugin interface which sends app launch events.
+ */
+@ProvidesInterface(action = AppLaunchEventsPlugin.ACTION, version = AppLaunchEventsPlugin.VERSION)
+public interface AppLaunchEventsPlugin extends Plugin {
+    String ACTION = "com.android.systemui.action.PLUGIN_APP_EVENTS";
+    int VERSION = 1;
+
+    /**
+     * Receives onStartShortcut event from
+     * {@link com.android.launcher3.appprediction.PredictionAppTracker}.
+     */
+    void onStartShortcut(String packageName, String shortcutId, UserHandle user, String container);
+
+    /**
+     * Receives onStartApp event from
+     * {@link com.android.launcher3.appprediction.PredictionAppTracker}.
+     */
+    void onStartApp(ComponentName componentName, UserHandle user, String container);
+
+    /**
+     * Receives onDismissApp event from
+     * {@link com.android.launcher3.appprediction.PredictionAppTracker}.
+     */
+    void onDismissApp(ComponentName componentName, UserHandle user, String container);
+
+    /**
+     * Receives onReturnedToHome event from
+     * {@link com.android.launcher3.appprediction.PredictionAppTracker}.
+     */
+    void onReturnedToHome();
+}
diff --git a/src_plugins/com/android/systemui/plugins/CustomWidgetPlugin.java b/src_plugins/com/android/systemui/plugins/CustomWidgetPlugin.java
new file mode 100644
index 0000000..77ad7ea
--- /dev/null
+++ b/src_plugins/com/android/systemui/plugins/CustomWidgetPlugin.java
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.plugins;
+
+import android.appwidget.AppWidgetHostView;
+
+import com.android.systemui.plugins.annotations.ProvidesInterface;
+
+/**
+ * Implement this plugin interface to add a custom widget.
+ */
+@ProvidesInterface(action = CustomWidgetPlugin.ACTION, version = CustomWidgetPlugin.VERSION)
+public interface CustomWidgetPlugin extends Plugin {
+
+    String ACTION = "com.android.systemui.action.PLUGIN_CUSTOM_WIDGET";
+    int VERSION = 1;
+
+    /**
+     * An unique identifier for this widget. Must be a non-negative integer.
+     */
+    int getProviderId();
+
+    /**
+     * The label to display to the user in the AppWidget picker.
+     */
+    String getLabel();
+
+    /**
+     * A preview of what the AppWidget will look like after it's configured.
+     * If not supplied, the AppWidget's icon will be used.
+     */
+    int getPreviewImage();
+
+    /**
+     * The icon to display for this AppWidget in the AppWidget picker. If not supplied in the
+     * xml, the application icon will be used.
+     */
+    int getIcon();
+
+    /**
+     * The default width of the widget when added to a host, in dp. The widget will get
+     * at least this width, and will often be given more, depending on the host.
+     */
+    int getSpanX();
+
+    /**
+     * The default height of the widget when added to a host, in dp. The widget will get
+     * at least this height, and will often be given more, depending on the host.
+     */
+    int getSpanY();
+
+    /**
+     * Minimum width (in dp) which the widget can be resized to. This field has no effect if it
+     * is greater than minWidth or if horizontal resizing isn't enabled.
+     */
+    int getMinSpanX();
+
+    /**
+     * Minimum height (in dp) which the widget can be resized to. This field has no effect if it
+     * is greater than minHeight or if vertical resizing isn't enabled.
+     */
+    int getMinSpanY();
+
+    /**
+     * The rules by which a widget can be resized.
+     */
+    int getResizeMode();
+
+    /**
+     * Notify the plugin that container of the widget has been rendered, where the custom widget
+     * can be attached to.
+     */
+    void onViewCreated(AppWidgetHostView parent);
+}
diff --git a/src_plugins/com/android/systemui/plugins/OverlayPlugin.java b/src_plugins/com/android/systemui/plugins/OverlayPlugin.java
new file mode 100644
index 0000000..1edb692
--- /dev/null
+++ b/src_plugins/com/android/systemui/plugins/OverlayPlugin.java
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.systemui.plugins;
+
+import android.app.Activity;
+
+import com.android.systemui.plugins.annotations.ProvidesInterface;
+import com.android.systemui.plugins.shared.LauncherExterns;
+import com.android.systemui.plugins.shared.LauncherOverlayManager;
+
+/**
+ * Implement this interface to add a -1 content on the home screen.
+ */
+@ProvidesInterface(action = OverlayPlugin.ACTION, version = OverlayPlugin.VERSION)
+public interface OverlayPlugin extends Plugin {
+    String ACTION = "com.android.systemui.action.PLUGIN_LAUNCHER_OVERLAY";
+    int VERSION = 1;
+
+    LauncherOverlayManager createOverlayManager(Activity activity, LauncherExterns externs);
+
+}
diff --git a/src/com/android/launcher3/LauncherExterns.java b/src_plugins/com/android/systemui/plugins/shared/LauncherExterns.java
similarity index 63%
rename from src/com/android/launcher3/LauncherExterns.java
rename to src_plugins/com/android/systemui/plugins/shared/LauncherExterns.java
index 272bbf6..13e4999 100644
--- a/src/com/android/launcher3/LauncherExterns.java
+++ b/src_plugins/com/android/systemui/plugins/shared/LauncherExterns.java
@@ -14,19 +14,36 @@
  * limitations under the License.
  */
 
-package com.android.launcher3;
+package com.android.systemui.plugins.shared;
 
 import android.content.SharedPreferences;
 
+import com.android.systemui.plugins.shared.LauncherOverlayManager.LauncherOverlay;
+
 /**
  * This interface defines the set of methods that the Launcher activity exposes. Methods
  * here should be safe to call from classes outside of com.android.launcher3.*
  */
 public interface LauncherExterns {
 
-    boolean setLauncherCallbacks(LauncherCallbacks callbacks);
-
+    /**
+     * Returns the shared main preference
+     */
     SharedPreferences getSharedPrefs();
 
-    void setLauncherOverlay(Launcher.LauncherOverlay overlay);
+    /**
+     * Returns the device specific preference
+     */
+    SharedPreferences getDevicePrefs();
+
+    /**
+     * Sets the overlay on the target activity
+     */
+    void setLauncherOverlay(LauncherOverlay overlay);
+
+    /**
+     * Executes the command, next time the overlay is hidden
+     */
+    void runOnOverlayHidden(Runnable runnable);
+
 }
diff --git a/src_plugins/com/android/systemui/plugins/shared/LauncherOverlayManager.java b/src_plugins/com/android/systemui/plugins/shared/LauncherOverlayManager.java
new file mode 100644
index 0000000..ac02ba4
--- /dev/null
+++ b/src_plugins/com/android/systemui/plugins/shared/LauncherOverlayManager.java
@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.systemui.plugins.shared;
+
+import android.app.Activity;
+import android.app.Application;
+import android.os.Bundle;
+
+import java.io.PrintWriter;
+
+/**
+ * Interface to control the overlay on Launcher
+ */
+public interface LauncherOverlayManager extends Application.ActivityLifecycleCallbacks {
+
+    default void onDeviceProvideChanged() { }
+
+    default void onAttachedToWindow() { }
+    default void onDetachedFromWindow() { }
+
+    default void dump(String prefix, PrintWriter w) { }
+
+    default void openOverlay() { }
+
+    default void hideOverlay(boolean animate) {
+        hideOverlay(animate ? 200 : 0);
+    }
+
+    default void hideOverlay(int duration) { }
+
+    default boolean startSearch(byte[] config, Bundle extras) {
+        return false;
+    }
+
+    @Override
+    default void onActivityCreated(Activity activity, Bundle bundle) { }
+
+    @Override
+    default void onActivityStarted(Activity activity) { }
+
+    @Override
+    default void onActivityResumed(Activity activity) { }
+
+    @Override
+    default void onActivityPaused(Activity activity) { }
+
+    @Override
+    default void onActivityStopped(Activity activity) { }
+
+    @Override
+    default void onActivitySaveInstanceState(Activity activity, Bundle bundle) { }
+
+    @Override
+    default void onActivityDestroyed(Activity activity) { }
+
+    interface LauncherOverlay {
+
+        /**
+         * Touch interaction leading to overscroll has begun
+         */
+        void onScrollInteractionBegin();
+
+        /**
+         * Touch interaction related to overscroll has ended
+         */
+        void onScrollInteractionEnd();
+
+        /**
+         * Scroll progress, between 0 and 100, when the user scrolls beyond the leftmost
+         * screen (or in the case of RTL, the rightmost screen).
+         */
+        void onScrollChange(float progress, boolean rtl);
+
+        /**
+         * Called when the launcher is ready to use the overlay
+         * @param callbacks A set of callbacks provided by Launcher in relation to the overlay
+         */
+        void setOverlayCallbacks(LauncherOverlayCallbacks callbacks);
+    }
+
+    interface LauncherOverlayCallbacks {
+
+        void onScrollChanged(float progress);
+    }
+}
diff --git a/src_shortcuts_overrides/com/android/launcher3/model/WidgetsModel.java b/src_shortcuts_overrides/com/android/launcher3/model/WidgetsModel.java
index 7a7f828..0f6ad27 100644
--- a/src_shortcuts_overrides/com/android/launcher3/model/WidgetsModel.java
+++ b/src_shortcuts_overrides/com/android/launcher3/model/WidgetsModel.java
@@ -11,8 +11,6 @@
 import android.util.Log;
 
 import com.android.launcher3.AppFilter;
-import com.android.launcher3.icons.ComponentWithLabel;
-import com.android.launcher3.icons.IconCache;
 import com.android.launcher3.InvariantDeviceProfile;
 import com.android.launcher3.LauncherAppState;
 import com.android.launcher3.LauncherAppWidgetProviderInfo;
@@ -22,6 +20,8 @@
 import com.android.launcher3.compat.LauncherAppsCompat;
 import com.android.launcher3.compat.ShortcutConfigActivityInfo;
 import com.android.launcher3.config.FeatureFlags;
+import com.android.launcher3.icons.ComponentWithLabel;
+import com.android.launcher3.icons.IconCache;
 import com.android.launcher3.util.MultiHashMap;
 import com.android.launcher3.util.PackageUserKey;
 import com.android.launcher3.util.Preconditions;
@@ -46,6 +46,9 @@
  */
 public class WidgetsModel {
 
+    // True is the widget support is disabled.
+    public static final boolean GO_DISABLE_WIDGETS = false;
+
     private static final String TAG = "WidgetsModel";
     private static final boolean DEBUG = false;
 
diff --git a/src_ui_overrides/com/android/launcher3/uioverrides/TogglableFlag.java b/src_ui_overrides/com/android/launcher3/uioverrides/TogglableFlag.java
index 60f12d8..d7bb293 100644
--- a/src_ui_overrides/com/android/launcher3/uioverrides/TogglableFlag.java
+++ b/src_ui_overrides/com/android/launcher3/uioverrides/TogglableFlag.java
@@ -17,7 +17,8 @@
 package com.android.launcher3.uioverrides;
 
 import android.content.Context;
-import com.android.launcher3.config.BaseFlags.BaseTogglableFlag;
+
+import com.android.launcher3.config.FeatureFlags.BaseTogglableFlag;
 
 public class TogglableFlag extends BaseTogglableFlag {
 
diff --git a/tests/src/com/android/launcher3/compat/PromiseIconUiTest.java b/tests/src/com/android/launcher3/compat/PromiseIconUiTest.java
index efbd9c9..7ef946d 100644
--- a/tests/src/com/android/launcher3/compat/PromiseIconUiTest.java
+++ b/tests/src/com/android/launcher3/compat/PromiseIconUiTest.java
@@ -48,7 +48,6 @@
     public void setUp() throws Exception {
         super.setUp();
         mDevice.pressHome();
-        waitForLauncherCondition("Launcher didn't start", launcher -> launcher != null);
         waitForState("Launcher internal state didn't switch to Home", LauncherState.NORMAL);
         mSessionId = -1;
     }
diff --git a/tests/src/com/android/launcher3/ui/AbstractLauncherUiTest.java b/tests/src/com/android/launcher3/ui/AbstractLauncherUiTest.java
index 86635ed..ed5f299 100644
--- a/tests/src/com/android/launcher3/ui/AbstractLauncherUiTest.java
+++ b/tests/src/com/android/launcher3/ui/AbstractLauncherUiTest.java
@@ -30,6 +30,7 @@
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
+import android.content.pm.ActivityInfo;
 import android.content.pm.LauncherActivityInfo;
 import android.content.pm.PackageManager;
 import android.os.Process;
@@ -368,11 +369,16 @@
                 mDevice.wait(Until.hasObject(selector), DEFAULT_UI_TIMEOUT));
     }
 
-    public static String resolveSystemApp(String category) {
+    public static ActivityInfo resolveSystemAppInfo(String category) {
         return getInstrumentation().getContext().getPackageManager().resolveActivity(
                 new Intent(Intent.ACTION_MAIN).addCategory(category),
                 PackageManager.MATCH_SYSTEM_ONLY).
-                activityInfo.packageName;
+                activityInfo;
+    }
+
+
+    public static String resolveSystemApp(String category) {
+        return resolveSystemAppInfo(category).packageName;
     }
 
     protected void closeLauncherActivity() {