diff --git a/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/QuickstepLauncher.java b/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/QuickstepLauncher.java
index 6aaae4c..37a3929 100644
--- a/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/QuickstepLauncher.java
+++ b/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/QuickstepLauncher.java
@@ -63,7 +63,7 @@
      */
     public static final AsyncCommand SET_SHELF_HEIGHT = (context, arg1, arg2) ->
             SystemUiProxy.INSTANCE.get(context).setShelfHeight(arg1 != 0, arg2);
-    public static RotationMode ROTATION_LANDSCAPE = new RotationMode(-90) {
+    public static final RotationMode ROTATION_LANDSCAPE = new RotationMode(-90) {
         @Override
         public void mapRect(int left, int top, int right, int bottom, Rect out) {
             out.left = top;
@@ -89,7 +89,7 @@
             }
         }
     };
-    public static RotationMode ROTATION_SEASCAPE = new RotationMode(90) {
+    public static final RotationMode ROTATION_SEASCAPE = new RotationMode(90) {
         @Override
         public void mapRect(int left, int top, int right, int bottom, Rect out) {
             out.left = bottom;
diff --git a/quickstep/recents_ui_overrides/src/com/android/quickstep/FallbackSwipeHandler.java b/quickstep/recents_ui_overrides/src/com/android/quickstep/FallbackSwipeHandler.java
index 40235d7..888ea9c 100644
--- a/quickstep/recents_ui_overrides/src/com/android/quickstep/FallbackSwipeHandler.java
+++ b/quickstep/recents_ui_overrides/src/com/android/quickstep/FallbackSwipeHandler.java
@@ -89,7 +89,7 @@
             mLauncherAlpha = launcherAlpha;
         }
     }
-    private static ArrayMap<GestureEndTarget, EndTargetAnimationParams>
+    private final ArrayMap<GestureEndTarget, EndTargetAnimationParams>
             mEndTargetAnimationParams = new ArrayMap();
 
     private final AnimatedFloat mLauncherAlpha = new AnimatedFloat(this::onLauncherAlphaChanged);
diff --git a/quickstep/recents_ui_overrides/src/com/android/quickstep/LauncherSwipeHandler.java b/quickstep/recents_ui_overrides/src/com/android/quickstep/LauncherSwipeHandler.java
index c28bf28..8f75c79 100644
--- a/quickstep/recents_ui_overrides/src/com/android/quickstep/LauncherSwipeHandler.java
+++ b/quickstep/recents_ui_overrides/src/com/android/quickstep/LauncherSwipeHandler.java
@@ -544,7 +544,7 @@
 
         if (ENABLE_QUICKSTEP_LIVE_TILE.get()) {
             if (mRecentsAnimationTargets != null) {
-                LiveTileOverlay.getInstance().update(
+                LiveTileOverlay.INSTANCE.update(
                         mAppWindowAnimationHelper.getCurrentRectWithInsets(),
                         mAppWindowAnimationHelper.getCurrentCornerRadius());
             }
@@ -829,7 +829,7 @@
             setShelfState(ShelfAnimState.CANCEL, LINEAR, 0);
             duration = Math.max(MIN_OVERSHOOT_DURATION, duration);
         } else if (endTarget == RECENTS) {
-            LiveTileOverlay.getInstance().startIconAnimation();
+            LiveTileOverlay.INSTANCE.startIconAnimation();
             if (mRecentsView != null) {
                 int nearestPage = mRecentsView.getPageNearestToCenterOfScreen();
                 if (mRecentsView.getNextPage() != nearestPage) {
@@ -1231,13 +1231,13 @@
     }
 
     private void addLiveTileOverlay() {
-        if (LiveTileOverlay.getInstance().attach(mActivity.getRootView().getOverlay())) {
+        if (LiveTileOverlay.INSTANCE.attach(mActivity.getRootView().getOverlay())) {
             mRecentsView.setLiveTileOverlayAttached(true);
         }
     }
 
     private void removeLiveTileOverlay() {
-        LiveTileOverlay.getInstance().detach(mActivity.getRootView().getOverlay());
+        LiveTileOverlay.INSTANCE.detach(mActivity.getRootView().getOverlay());
         mRecentsView.setLiveTileOverlayAttached(false);
     }
 
diff --git a/quickstep/recents_ui_overrides/src/com/android/quickstep/views/LiveTileOverlay.java b/quickstep/recents_ui_overrides/src/com/android/quickstep/views/LiveTileOverlay.java
index 18eda60..30c9f77 100644
--- a/quickstep/recents_ui_overrides/src/com/android/quickstep/views/LiveTileOverlay.java
+++ b/quickstep/recents_ui_overrides/src/com/android/quickstep/views/LiveTileOverlay.java
@@ -37,18 +37,11 @@
                 }
             };
 
-    private static LiveTileOverlay sInstance;
-
-    public static LiveTileOverlay getInstance() {
-        if (sInstance == null) {
-            sInstance = new LiveTileOverlay();
-        }
-        return sInstance;
-    }
+    public static final LiveTileOverlay INSTANCE = new LiveTileOverlay();
 
     private final Paint mPaint = new Paint();
+    private final Rect mBoundsRect = new Rect();
 
-    private Rect mBoundsRect = new Rect();
     private RectF mCurrentRect;
     private float mCornerRadius;
     private Drawable mIcon;
diff --git a/quickstep/recents_ui_overrides/src/com/android/quickstep/views/RecentsView.java b/quickstep/recents_ui_overrides/src/com/android/quickstep/views/RecentsView.java
index a8d88b9..0f0fda9 100644
--- a/quickstep/recents_ui_overrides/src/com/android/quickstep/views/RecentsView.java
+++ b/quickstep/recents_ui_overrides/src/com/android/quickstep/views/RecentsView.java
@@ -886,7 +886,7 @@
     public void onSwipeUpAnimationSuccess() {
         if (getRunningTaskView() != null) {
             float startProgress = ENABLE_QUICKSTEP_LIVE_TILE.get() && mLiveTileOverlayAttached
-                    ? LiveTileOverlay.getInstance().cancelIconAnimation()
+                    ? LiveTileOverlay.INSTANCE.cancelIconAnimation()
                     : 0f;
             animateUpRunningTaskIconScale(startProgress);
         }
@@ -1739,7 +1739,7 @@
 
     public void updateLiveTileIcon(Drawable icon) {
         if (mLiveTileOverlayAttached) {
-            LiveTileOverlay.getInstance().setIcon(icon);
+            LiveTileOverlay.INSTANCE.setIcon(icon);
         }
     }
 
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 adeb974..4e0fdea 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
@@ -61,9 +61,9 @@
  */
 public class TaskThumbnailView extends View implements PluginListener<OverviewScreenshotActions> {
 
-    private final static ColorMatrix COLOR_MATRIX = new ColorMatrix();
-    private final static ColorMatrix SATURATION_COLOR_MATRIX = new ColorMatrix();
-    private final static RectF EMPTY_RECT_F = new RectF();
+    private static final ColorMatrix COLOR_MATRIX = new ColorMatrix();
+    private static final ColorMatrix SATURATION_COLOR_MATRIX = new ColorMatrix();
+    private static final RectF EMPTY_RECT_F = new RectF();
 
     public static final Property<TaskThumbnailView, Float> DIM_ALPHA =
             new FloatProperty<TaskThumbnailView>("dimAlpha") {
diff --git a/quickstep/src/com/android/launcher3/BaseQuickstepLauncher.java b/quickstep/src/com/android/launcher3/BaseQuickstepLauncher.java
index 9ea13c6..ee53386 100644
--- a/quickstep/src/com/android/launcher3/BaseQuickstepLauncher.java
+++ b/quickstep/src/com/android/launcher3/BaseQuickstepLauncher.java
@@ -265,7 +265,7 @@
         // Instantiate and initialize WellbeingModel now that its loading won't interfere with
         // populating workspace.
         // TODO: Find a better place for this
-        WellbeingModel.get(this);
+        WellbeingModel.INSTANCE.get(this);
     }
 
     @Override
diff --git a/quickstep/src/com/android/launcher3/model/WellbeingModel.java b/quickstep/src/com/android/launcher3/model/WellbeingModel.java
index c86139b..92c8573 100644
--- a/quickstep/src/com/android/launcher3/model/WellbeingModel.java
+++ b/quickstep/src/com/android/launcher3/model/WellbeingModel.java
@@ -43,13 +43,13 @@
 import android.util.Log;
 
 import androidx.annotation.MainThread;
-import androidx.annotation.NonNull;
 
 import com.android.launcher3.BaseDraggingActivity;
 import com.android.launcher3.ItemInfo;
 import com.android.launcher3.R;
 import com.android.launcher3.popup.RemoteActionShortcut;
 import com.android.launcher3.popup.SystemShortcut;
+import com.android.launcher3.util.MainThreadInitializedObject;
 import com.android.launcher3.util.PackageManagerHelper;
 import com.android.launcher3.util.Preconditions;
 import com.android.launcher3.util.SimpleBroadcastReceiver;
@@ -78,7 +78,8 @@
     private static final String EXTRA_MAX_NUM_ACTIONS_SHOWN = "max_num_actions_shown";
     private static final String EXTRA_PACKAGES = "packages";
 
-    private static WellbeingModel sInstance;
+    public static final MainThreadInitializedObject<WellbeingModel> INSTANCE =
+            new MainThreadInitializedObject<>(WellbeingModel::new);
 
     private final Context mContext;
     private final String mWellbeingProviderPkg;
@@ -156,15 +157,6 @@
     }
 
     @MainThread
-    public static WellbeingModel get(@NonNull Context context) {
-        Preconditions.assertUIThread();
-        if (sInstance == null) {
-            sInstance = new WellbeingModel(context.getApplicationContext());
-        }
-        return sInstance;
-    }
-
-    @MainThread
     private SystemShortcut getShortcutForApp(String packageName, int userId,
             BaseDraggingActivity activity, ItemInfo info) {
         Preconditions.assertUIThread();
@@ -334,8 +326,8 @@
     /**
      * Shortcut factory for generating wellbeing action
      */
-    public static final SystemShortcut.Factory SHORTCUT_FACTORY = (activity, info) ->
-            (info.getTargetComponent() == null) ? null : WellbeingModel.get(activity)
+    public static final SystemShortcut.Factory SHORTCUT_FACTORY =
+            (activity, info) -> (info.getTargetComponent() == null) ? null : INSTANCE.get(activity)
                     .getShortcutForApp(
                             info.getTargetComponent().getPackageName(), info.user.getIdentifier(),
                             activity, info);
diff --git a/quickstep/src/com/android/launcher3/uioverrides/WallpaperColorInfo.java b/quickstep/src/com/android/launcher3/uioverrides/WallpaperColorInfo.java
index 711e59a..36c0e34 100644
--- a/quickstep/src/com/android/launcher3/uioverrides/WallpaperColorInfo.java
+++ b/quickstep/src/com/android/launcher3/uioverrides/WallpaperColorInfo.java
@@ -27,6 +27,7 @@
 import android.os.Handler;
 import android.os.Looper;
 
+import com.android.launcher3.util.MainThreadInitializedObject;
 import com.android.systemui.shared.system.TonalCompat;
 import com.android.systemui.shared.system.TonalCompat.ExtractionInfo;
 
@@ -39,17 +40,8 @@
     private static final int MAIN_COLOR_DARK = 0xff202124;
     private static final int MAIN_COLOR_REGULAR = 0xff000000;
 
-    private static final Object sInstanceLock = new Object();
-    private static WallpaperColorInfo sInstance;
-
-    public static WallpaperColorInfo getInstance(Context context) {
-        synchronized (sInstanceLock) {
-            if (sInstance == null) {
-                sInstance = new WallpaperColorInfo(context.getApplicationContext());
-            }
-            return sInstance;
-        }
-    }
+    public static final MainThreadInitializedObject<WallpaperColorInfo> INSTANCE =
+            new MainThreadInitializedObject<>(WallpaperColorInfo::new);
 
     private final ArrayList<OnChangeListener> mListeners = new ArrayList<>();
     private final WallpaperManager mWallpaperManager;
diff --git a/quickstep/src/com/android/quickstep/AnimatedFloat.java b/quickstep/src/com/android/quickstep/AnimatedFloat.java
index 84dfdbd..c3b90e3 100644
--- a/quickstep/src/com/android/quickstep/AnimatedFloat.java
+++ b/quickstep/src/com/android/quickstep/AnimatedFloat.java
@@ -25,17 +25,18 @@
  */
 public class AnimatedFloat {
 
-    public static FloatProperty<AnimatedFloat> VALUE = new FloatProperty<AnimatedFloat>("value") {
-        @Override
-        public void setValue(AnimatedFloat obj, float v) {
-            obj.updateValue(v);
-        }
+    public static final FloatProperty<AnimatedFloat> VALUE =
+            new FloatProperty<AnimatedFloat>("value") {
+                @Override
+                public void setValue(AnimatedFloat obj, float v) {
+                    obj.updateValue(v);
+                }
 
-        @Override
-        public Float get(AnimatedFloat obj) {
-            return obj.value;
-        }
-    };
+                @Override
+                public Float get(AnimatedFloat obj) {
+                    return obj.value;
+                }
+            };
 
     private final Runnable mUpdateCallback;
     private ObjectAnimator mValueAnimator;
diff --git a/quickstep/src/com/android/quickstep/BaseRecentsActivity.java b/quickstep/src/com/android/quickstep/BaseRecentsActivity.java
index 5fcdc19..1b9158b 100644
--- a/quickstep/src/com/android/quickstep/BaseRecentsActivity.java
+++ b/quickstep/src/com/android/quickstep/BaseRecentsActivity.java
@@ -43,7 +43,8 @@
  */
 public abstract class BaseRecentsActivity extends BaseDraggingActivity {
 
-    public static ActivityTracker<BaseRecentsActivity> ACTIVITY_TRACKER = new ActivityTracker<>();
+    public static final ActivityTracker<BaseRecentsActivity> ACTIVITY_TRACKER =
+            new ActivityTracker<>();
     private Configuration mOldConfig;
 
     @Override
@@ -56,7 +57,7 @@
 
         getSystemUiController().updateUiState(SystemUiController.UI_STATE_BASE_WINDOW,
                 Themes.getAttrBoolean(this, R.attr.isWorkspaceDarkText));
-        ACTIVITY_TRACKER.handleCreate((RecentsActivity) this);
+        ACTIVITY_TRACKER.handleCreate(this);
     }
 
     /**
diff --git a/quickstep/src/com/android/quickstep/SysUINavigationMode.java b/quickstep/src/com/android/quickstep/SysUINavigationMode.java
index 5902672..388b323 100644
--- a/quickstep/src/com/android/quickstep/SysUINavigationMode.java
+++ b/quickstep/src/com/android/quickstep/SysUINavigationMode.java
@@ -52,7 +52,7 @@
         return INSTANCE.get(context).getMode();
     }
 
-    public static MainThreadInitializedObject<SysUINavigationMode> INSTANCE =
+    public static final MainThreadInitializedObject<SysUINavigationMode> INSTANCE =
             new MainThreadInitializedObject<>(SysUINavigationMode::new);
 
     private static final String TAG = "SysUINavigationMode";
diff --git a/quickstep/src/com/android/quickstep/util/NavBarPosition.java b/quickstep/src/com/android/quickstep/util/NavBarPosition.java
index a4614de..8dc19dc 100644
--- a/quickstep/src/com/android/quickstep/util/NavBarPosition.java
+++ b/quickstep/src/com/android/quickstep/util/NavBarPosition.java
@@ -31,7 +31,7 @@
  */
 public class NavBarPosition {
 
-    public static RotationMode ROTATION_LANDSCAPE = new RotationMode(-90) {
+    public static final RotationMode ROTATION_LANDSCAPE = new RotationMode(-90) {
         @Override
         public void mapRect(int left, int top, int right, int bottom, Rect out) {
             out.left = top;
@@ -58,7 +58,7 @@
         }
     };
 
-    public static RotationMode ROTATION_SEASCAPE = new RotationMode(90) {
+    public static final RotationMode ROTATION_SEASCAPE = new RotationMode(90) {
         @Override
         public void mapRect(int left, int top, int right, int bottom, Rect out) {
             out.left = bottom;
diff --git a/robolectric_tests/src/com/android/launcher3/model/BaseModelUpdateTaskTestCase.java b/robolectric_tests/src/com/android/launcher3/model/BaseModelUpdateTaskTestCase.java
index f7e05a4..012258d 100644
--- a/robolectric_tests/src/com/android/launcher3/model/BaseModelUpdateTaskTestCase.java
+++ b/robolectric_tests/src/com/android/launcher3/model/BaseModelUpdateTaskTestCase.java
@@ -7,7 +7,6 @@
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
-import static org.robolectric.util.ReflectionHelpers.setField;
 
 import android.content.ComponentName;
 import android.content.Context;
@@ -32,7 +31,7 @@
 import com.android.launcher3.icons.IconCache;
 import com.android.launcher3.icons.cache.CachingLogic;
 import com.android.launcher3.model.BgDataModel.Callbacks;
-import com.android.launcher3.pm.PackageInstallerCompat;
+import com.android.launcher3.pm.InstallSessionHelper;
 import com.android.launcher3.util.ComponentKey;
 import com.android.launcher3.util.TestLauncherProvider;
 
@@ -76,7 +75,7 @@
     public void setUp() throws Exception {
         ShadowLog.stream = System.out;
         reinitializeStaticExecutors();
-        setField(PackageInstallerCompat.class, null, "sInstance", null);
+        InstallSessionHelper.INSTANCE.initializeForTesting(null);
 
         provider = Robolectric.setupContentProvider(TestLauncherProvider.class);
         ShadowContentResolver.registerProviderInternal(LauncherProvider.AUTHORITY, provider);
diff --git a/robolectric_tests/src/com/android/launcher3/model/DefaultLayoutProviderTest.java b/robolectric_tests/src/com/android/launcher3/model/DefaultLayoutProviderTest.java
index 9e4a43c..68713d8 100644
--- a/robolectric_tests/src/com/android/launcher3/model/DefaultLayoutProviderTest.java
+++ b/robolectric_tests/src/com/android/launcher3/model/DefaultLayoutProviderTest.java
@@ -34,6 +34,7 @@
 import com.android.launcher3.LauncherProvider;
 import com.android.launcher3.LauncherSettings;
 import com.android.launcher3.icons.BitmapInfo;
+import com.android.launcher3.pm.InstallSessionHelper;
 import com.android.launcher3.shadows.LShadowLauncherApps;
 import com.android.launcher3.shadows.LShadowUserManager;
 import com.android.launcher3.shadows.ShadowLooperExecutor;
@@ -95,6 +96,7 @@
     public void cleanup() {
         InvariantDeviceProfile.INSTANCE.initializeForTesting(null);
         CustomWidgetManager.INSTANCE.initializeForTesting(null);
+        InstallSessionHelper.INSTANCE.initializeForTesting(null);
     }
 
     @Test
diff --git a/src/com/android/launcher3/AppInfo.java b/src/com/android/launcher3/AppInfo.java
index dfa4796..af219ba 100644
--- a/src/com/android/launcher3/AppInfo.java
+++ b/src/com/android/launcher3/AppInfo.java
@@ -36,8 +36,8 @@
  */
 public class AppInfo extends ItemInfoWithIcon {
 
-    public static AppInfo[] EMPTY_ARRAY = new AppInfo[0];
-    public static Comparator<AppInfo> COMPONENT_KEY_COMPARATOR = (a, b) -> {
+    public static final AppInfo[] EMPTY_ARRAY = new AppInfo[0];
+    public static final Comparator<AppInfo> COMPONENT_KEY_COMPARATOR = (a, b) -> {
         int uc = a.user.hashCode() - b.user.hashCode();
         return uc != 0 ? uc : a.componentName.compareTo(b.componentName);
     };
diff --git a/src/com/android/launcher3/AppWidgetResizeFrame.java b/src/com/android/launcher3/AppWidgetResizeFrame.java
index f9a8d1b..73d8a88 100644
--- a/src/com/android/launcher3/AppWidgetResizeFrame.java
+++ b/src/com/android/launcher3/AppWidgetResizeFrame.java
@@ -22,6 +22,7 @@
 import com.android.launcher3.accessibility.DragViewStateAnnouncer;
 import com.android.launcher3.dragndrop.DragLayer;
 import com.android.launcher3.util.FocusLogic;
+import com.android.launcher3.util.MainThreadInitializedObject;
 import com.android.launcher3.widget.LauncherAppWidgetHostView;
 
 import java.util.ArrayList;
@@ -35,7 +36,12 @@
     private static final Rect sTmpRect = new Rect();
 
     // Represents the cell size on the grid in the two orientations.
-    private static Point[] sCellSize;
+    private static final MainThreadInitializedObject<Point[]> CELL_SIZE =
+            new MainThreadInitializedObject<>(c -> {
+                InvariantDeviceProfile inv = LauncherAppState.getIDP(c);
+                return new Point[] {inv.landscapeProfile.getCellSize(),
+                        inv.portraitProfile.getCellSize()};
+            });
 
     private static final int HANDLE_COUNT = 4;
     private static final int INDEX_LEFT = 0;
@@ -352,27 +358,19 @@
     }
 
     public static Rect getWidgetSizeRanges(Context context, int spanX, int spanY, Rect rect) {
-        if (sCellSize == null) {
-            InvariantDeviceProfile inv = LauncherAppState.getIDP(context);
-
-            // Initiate cell sizes.
-            sCellSize = new Point[2];
-            sCellSize[0] = inv.landscapeProfile.getCellSize();
-            sCellSize[1] = inv.portraitProfile.getCellSize();
-        }
-
         if (rect == null) {
             rect = new Rect();
         }
         final float density = context.getResources().getDisplayMetrics().density;
+        final Point[] cellSize = CELL_SIZE.get(context);
 
         // Compute landscape size
-        int landWidth = (int) ((spanX * sCellSize[0].x) / density);
-        int landHeight = (int) ((spanY * sCellSize[0].y) / density);
+        int landWidth = (int) ((spanX * cellSize[0].x) / density);
+        int landHeight = (int) ((spanY * cellSize[0].y) / density);
 
         // Compute portrait size
-        int portWidth = (int) ((spanX * sCellSize[1].x) / density);
-        int portHeight = (int) ((spanY * sCellSize[1].y) / density);
+        int portWidth = (int) ((spanX * cellSize[1].x) / density);
+        int portHeight = (int) ((spanY * cellSize[1].y) / density);
         rect.set(portWidth, landHeight, landWidth, portHeight);
         return rect;
     }
diff --git a/src/com/android/launcher3/BaseDraggingActivity.java b/src/com/android/launcher3/BaseDraggingActivity.java
index 772eb00..893f64a 100644
--- a/src/com/android/launcher3/BaseDraggingActivity.java
+++ b/src/com/android/launcher3/BaseDraggingActivity.java
@@ -73,8 +73,7 @@
         mRotationListener = new DisplayRotationListener(this, this::onDeviceRotationChanged);
 
         // Update theme
-        WallpaperColorInfo wallpaperColorInfo = WallpaperColorInfo.getInstance(this);
-        wallpaperColorInfo.addOnChangeListener(this);
+        WallpaperColorInfo.INSTANCE.get(this).addOnChangeListener(this);
         int themeRes = Themes.getActivityThemeRes(this);
         if (themeRes != mThemeRes) {
             mThemeRes = themeRes;
@@ -234,7 +233,7 @@
     @Override
     protected void onDestroy() {
         super.onDestroy();
-        WallpaperColorInfo.getInstance(this).removeOnChangeListener(this);
+        WallpaperColorInfo.INSTANCE.get(this).removeOnChangeListener(this);
         mRotationListener.disable();
     }
 
diff --git a/src/com/android/launcher3/CellLayout.java b/src/com/android/launcher3/CellLayout.java
index 89bec98..ac61c49 100644
--- a/src/com/android/launcher3/CellLayout.java
+++ b/src/com/android/launcher3/CellLayout.java
@@ -179,7 +179,7 @@
 
     private final Rect mTempRect = new Rect();
 
-    private final static Paint sPaint = new Paint();
+    private static final Paint sPaint = new Paint();
 
     // Related to accessible drag and drop
     private DragAndDropAccessibilityDelegate mTouchHelper;
diff --git a/src/com/android/launcher3/LauncherAppState.java b/src/com/android/launcher3/LauncherAppState.java
index b8721d7..c6946ca 100644
--- a/src/com/android/launcher3/LauncherAppState.java
+++ b/src/com/android/launcher3/LauncherAppState.java
@@ -32,8 +32,8 @@
 import com.android.launcher3.icons.IconProvider;
 import com.android.launcher3.icons.LauncherIcons;
 import com.android.launcher3.notification.NotificationListener;
+import com.android.launcher3.pm.InstallSessionHelper;
 import com.android.launcher3.pm.InstallSessionTracker;
-import com.android.launcher3.pm.PackageInstallerCompat;
 import com.android.launcher3.pm.UserCache;
 import com.android.launcher3.util.MainThreadInitializedObject;
 import com.android.launcher3.util.Preconditions;
@@ -109,7 +109,7 @@
         mInvariantDeviceProfile.addOnChangeListener(this::onIdpChanged);
         new Handler().post( () -> mInvariantDeviceProfile.verifyConfigChangedInBackground(context));
 
-        mInstallSessionTracker = PackageInstallerCompat.getInstance(context)
+        mInstallSessionTracker = InstallSessionHelper.INSTANCE.get(context)
                 .registerInstallTracker(mModel, MODEL_EXECUTOR);
 
         if (!mContext.getResources().getBoolean(R.bool.notification_dots_enabled)) {
diff --git a/src/com/android/launcher3/Partner.java b/src/com/android/launcher3/Partner.java
index af5402a..d79f62d 100644
--- a/src/com/android/launcher3/Partner.java
+++ b/src/com/android/launcher3/Partner.java
@@ -53,21 +53,12 @@
     public static final String RES_GRID_NUM_COLUMNS = "grid_num_columns";
     public static final String RES_GRID_ICON_SIZE_DP = "grid_icon_size_dp";
 
-    private static boolean sSearched = false;
-    private static Partner sPartner;
-
     /**
      * Find and return partner details, or {@code null} if none exists.
      */
     public static synchronized Partner get(PackageManager pm) {
-        if (!sSearched) {
-            Pair<String, Resources> apkInfo = findSystemApk(ACTION_PARTNER_CUSTOMIZATION, pm);
-            if (apkInfo != null) {
-                sPartner = new Partner(apkInfo.first, apkInfo.second);
-            }
-            sSearched = true;
-        }
-        return sPartner;
+        Pair<String, Resources> apkInfo = findSystemApk(ACTION_PARTNER_CUSTOMIZATION, pm);
+        return apkInfo != null ? new Partner(apkInfo.first, apkInfo.second) : null;
     }
 
     private final String mPackageName;
diff --git a/src/com/android/launcher3/SessionCommitReceiver.java b/src/com/android/launcher3/SessionCommitReceiver.java
index e0c50e2..f0bae02 100644
--- a/src/com/android/launcher3/SessionCommitReceiver.java
+++ b/src/com/android/launcher3/SessionCommitReceiver.java
@@ -16,7 +16,7 @@
 
 package com.android.launcher3;
 
-import static com.android.launcher3.pm.PackageInstallerCompat.getUserHandle;
+import static com.android.launcher3.pm.InstallSessionHelper.getUserHandle;
 
 import android.annotation.TargetApi;
 import android.content.BroadcastReceiver;
@@ -40,7 +40,7 @@
 import android.text.TextUtils;
 import android.util.Log;
 
-import com.android.launcher3.pm.PackageInstallerCompat;
+import com.android.launcher3.pm.InstallSessionHelper;
 import com.android.launcher3.util.Executors;
 
 import java.util.List;
@@ -77,7 +77,7 @@
             return;
         }
 
-        PackageInstallerCompat packageInstallerCompat = PackageInstallerCompat.getInstance(context);
+        InstallSessionHelper packageInstallerCompat = InstallSessionHelper.INSTANCE.get(context);
         if (TextUtils.isEmpty(info.getAppPackageName())
                 || info.getInstallReason() != PackageManager.INSTALL_REASON_USER
                 || packageInstallerCompat.promiseIconAddedForId(info.getSessionId())) {
diff --git a/src/com/android/launcher3/folder/FolderPreviewItemAnim.java b/src/com/android/launcher3/folder/FolderPreviewItemAnim.java
index 1e56f7d..22f7333 100644
--- a/src/com/android/launcher3/folder/FolderPreviewItemAnim.java
+++ b/src/com/android/launcher3/folder/FolderPreviewItemAnim.java
@@ -44,7 +44,8 @@
                 }
             };
 
-    private static PreviewItemDrawingParams sTmpParams = new PreviewItemDrawingParams(0, 0, 0, 0);
+    private static final PreviewItemDrawingParams sTmpParams =
+            new PreviewItemDrawingParams(0, 0, 0, 0);
     private static final float[] sTempParamsArray = new float[3];
 
     private final ObjectAnimator mAnimator;
diff --git a/src/com/android/launcher3/graphics/RotationMode.java b/src/com/android/launcher3/graphics/RotationMode.java
index b06305f..6dd356a 100644
--- a/src/com/android/launcher3/graphics/RotationMode.java
+++ b/src/com/android/launcher3/graphics/RotationMode.java
@@ -20,7 +20,7 @@
 
 public abstract class RotationMode {
 
-    public static RotationMode NORMAL = new RotationMode(0) { };
+    public static final RotationMode NORMAL = new RotationMode(0) { };
 
     public final float surfaceRotation;
     public final boolean isTransposed;
diff --git a/src/com/android/launcher3/graphics/Scrim.java b/src/com/android/launcher3/graphics/Scrim.java
index 5c14f8d..67b2b6d 100644
--- a/src/com/android/launcher3/graphics/Scrim.java
+++ b/src/com/android/launcher3/graphics/Scrim.java
@@ -31,7 +31,7 @@
 public class Scrim implements View.OnAttachStateChangeListener,
         WallpaperColorInfo.OnChangeListener {
 
-    public static Property<Scrim, Float> SCRIM_PROGRESS =
+    public static final Property<Scrim, Float> SCRIM_PROGRESS =
             new Property<Scrim, Float>(Float.TYPE, "scrimProgress") {
                 @Override
                 public Float get(Scrim scrim) {
@@ -55,7 +55,7 @@
     public Scrim(View view) {
         mRoot = view;
         mLauncher = Launcher.getLauncher(view.getContext());
-        mWallpaperColorInfo = WallpaperColorInfo.getInstance(mLauncher);
+        mWallpaperColorInfo = WallpaperColorInfo.INSTANCE.get(mLauncher);
 
         view.addOnAttachStateChangeListener(this);
     }
diff --git a/src/com/android/launcher3/graphics/WorkspaceAndHotseatScrim.java b/src/com/android/launcher3/graphics/WorkspaceAndHotseatScrim.java
index 6740fa1..8020f15 100644
--- a/src/com/android/launcher3/graphics/WorkspaceAndHotseatScrim.java
+++ b/src/com/android/launcher3/graphics/WorkspaceAndHotseatScrim.java
@@ -54,7 +54,7 @@
  */
 public class WorkspaceAndHotseatScrim extends Scrim {
 
-    public static Property<WorkspaceAndHotseatScrim, Float> SYSUI_PROGRESS =
+    public static final Property<WorkspaceAndHotseatScrim, Float> SYSUI_PROGRESS =
             new Property<WorkspaceAndHotseatScrim, Float>(Float.TYPE, "sysUiProgress") {
                 @Override
                 public Float get(WorkspaceAndHotseatScrim scrim) {
@@ -67,7 +67,7 @@
                 }
             };
 
-    private static Property<WorkspaceAndHotseatScrim, Float> SYSUI_ANIM_MULTIPLIER =
+    private static final Property<WorkspaceAndHotseatScrim, Float> SYSUI_ANIM_MULTIPLIER =
             new Property<WorkspaceAndHotseatScrim, Float>(Float.TYPE, "sysUiAnimMultiplier") {
                 @Override
                 public Float get(WorkspaceAndHotseatScrim scrim) {
diff --git a/src/com/android/launcher3/model/AddWorkspaceItemsTask.java b/src/com/android/launcher3/model/AddWorkspaceItemsTask.java
index fa0fe1b..eb95395 100644
--- a/src/com/android/launcher3/model/AddWorkspaceItemsTask.java
+++ b/src/com/android/launcher3/model/AddWorkspaceItemsTask.java
@@ -33,7 +33,7 @@
 import com.android.launcher3.LauncherSettings;
 import com.android.launcher3.WorkspaceItemInfo;
 import com.android.launcher3.model.BgDataModel.Callbacks;
-import com.android.launcher3.pm.PackageInstallerCompat;
+import com.android.launcher3.pm.InstallSessionHelper;
 import com.android.launcher3.util.GridOccupancy;
 import com.android.launcher3.util.IntArray;
 import com.android.launcher3.util.PackageManagerHelper;
@@ -93,8 +93,8 @@
                 }
             }
 
-            PackageInstallerCompat packageInstaller =
-                    PackageInstallerCompat.getInstance(app.getContext());
+            InstallSessionHelper packageInstaller =
+                    InstallSessionHelper.INSTANCE.get(app.getContext());
             LauncherApps launcherApps = app.getContext().getSystemService(LauncherApps.class);
 
             for (ItemInfo item : filteredItems) {
diff --git a/src/com/android/launcher3/model/GridSizeMigrationTask.java b/src/com/android/launcher3/model/GridSizeMigrationTask.java
index 8b76190..c35c4b9 100644
--- a/src/com/android/launcher3/model/GridSizeMigrationTask.java
+++ b/src/com/android/launcher3/model/GridSizeMigrationTask.java
@@ -29,7 +29,7 @@
 import com.android.launcher3.Utilities;
 import com.android.launcher3.Workspace;
 import com.android.launcher3.config.FeatureFlags;
-import com.android.launcher3.pm.PackageInstallerCompat;
+import com.android.launcher3.pm.InstallSessionHelper;
 import com.android.launcher3.provider.LauncherDbUtils;
 import com.android.launcher3.provider.LauncherDbUtils.SQLiteTransaction;
 import com.android.launcher3.util.GridOccupancy;
@@ -971,7 +971,7 @@
                 .getInstalledPackages(PackageManager.GET_UNINSTALLED_PACKAGES)) {
             validPackages.add(info.packageName);
         }
-        PackageInstallerCompat.getInstance(context)
+        InstallSessionHelper.INSTANCE.get(context)
                 .getActiveSessions().keySet()
                 .forEach(packageUserKey -> validPackages.add(packageUserKey.mPackageName));
         return validPackages;
diff --git a/src/com/android/launcher3/model/LoaderTask.java b/src/com/android/launcher3/model/LoaderTask.java
index cec3007..605bb75 100644
--- a/src/com/android/launcher3/model/LoaderTask.java
+++ b/src/com/android/launcher3/model/LoaderTask.java
@@ -67,8 +67,8 @@
 import com.android.launcher3.icons.ShortcutCachingLogic;
 import com.android.launcher3.icons.cache.IconCacheUpdateHandler;
 import com.android.launcher3.logging.FileLog;
+import com.android.launcher3.pm.InstallSessionHelper;
 import com.android.launcher3.pm.PackageInstallInfo;
-import com.android.launcher3.pm.PackageInstallerCompat;
 import com.android.launcher3.pm.UserCache;
 import com.android.launcher3.provider.ImportDataTask;
 import com.android.launcher3.qsb.QsbContainerView;
@@ -115,7 +115,7 @@
     private final UserCache mUserCache;
 
     private final DeepShortcutManager mShortcutManager;
-    private final PackageInstallerCompat mPackageInstaller;
+    private final InstallSessionHelper mSessionHelper;
     private final IconCache mIconCache;
 
     private boolean mStopped;
@@ -131,7 +131,7 @@
         mUserManager = mApp.getContext().getSystemService(UserManager.class);
         mUserCache = UserCache.INSTANCE.get(mApp.getContext());
         mShortcutManager = DeepShortcutManager.getInstance(mApp.getContext());
-        mPackageInstaller = PackageInstallerCompat.getInstance(mApp.getContext());
+        mSessionHelper = InstallSessionHelper.INSTANCE.get(mApp.getContext());
         mIconCache = mApp.getIconCache();
     }
 
@@ -311,7 +311,7 @@
             mBgDataModel.clear();
 
             final HashMap<PackageUserKey, SessionInfo> installingPkgs =
-                    mPackageInstaller.getActiveSessions();
+                    mSessionHelper.getActiveSessions();
             installingPkgs.forEach(mApp.getIconCache()::updateSessionCache);
 
             final PackageUserKey tempPackageKey = new PackageUserKey(null, null);
@@ -871,7 +871,7 @@
         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()) {
+                    mSessionHelper.getAllVerifiedSessions()) {
                 mBgAllAppsList.addPromiseApp(mApp.getContext(),
                         PackageInstallInfo.fromInstallingState(info));
             }
diff --git a/src/com/android/launcher3/model/WidgetItem.java b/src/com/android/launcher3/model/WidgetItem.java
index b442c42..37c089e 100644
--- a/src/com/android/launcher3/model/WidgetItem.java
+++ b/src/com/android/launcher3/model/WidgetItem.java
@@ -2,8 +2,6 @@
 
 import android.content.pm.ActivityInfo;
 import android.content.pm.PackageManager;
-import android.os.Process;
-import android.os.UserHandle;
 
 import com.android.launcher3.InvariantDeviceProfile;
 import com.android.launcher3.LauncherAppWidgetProviderInfo;
@@ -12,17 +10,12 @@
 import com.android.launcher3.pm.ShortcutConfigActivityInfo;
 import com.android.launcher3.util.ComponentKey;
 
-import java.text.Collator;
-
 /**
  * An wrapper over various items displayed in a widget picker,
  * {@link LauncherAppWidgetProviderInfo} & {@link ActivityInfo}. This provides easier access to
  * common attributes like spanX and spanY.
  */
-public class WidgetItem extends ComponentKey implements Comparable<WidgetItem> {
-
-    private static UserHandle sMyUserHandle;
-    private static Collator sCollator;
+public class WidgetItem extends ComponentKey {
 
     public final LauncherAppWidgetProviderInfo widgetInfo;
     public final ShortcutConfigActivityInfo activityInfo;
@@ -50,34 +43,4 @@
         activityInfo = info;
         spanX = spanY = 1;
     }
-
-    @Override
-    public int compareTo(WidgetItem another) {
-        if (sMyUserHandle == null) {
-            // Delay these object creation until required.
-            sMyUserHandle = Process.myUserHandle();
-            sCollator = Collator.getInstance();
-        }
-
-        // Independent of how the labels compare, if only one of the two widget info belongs to
-        // work profile, put that one in the back.
-        boolean thisWorkProfile = !sMyUserHandle.equals(user);
-        boolean otherWorkProfile = !sMyUserHandle.equals(another.user);
-        if (thisWorkProfile ^ otherWorkProfile) {
-            return thisWorkProfile ? 1 : -1;
-        }
-
-        int labelCompare = sCollator.compare(label, another.label);
-        if (labelCompare != 0) {
-            return labelCompare;
-        }
-
-        // If the label is same, put the smaller widget before the larger widget. If the area is
-        // also same, put the widget with smaller height before.
-        int thisArea = spanX * spanY;
-        int otherArea = another.spanX * another.spanY;
-        return thisArea == otherArea
-                ? Integer.compare(spanY, another.spanY)
-                : Integer.compare(thisArea, otherArea);
-    }
 }
diff --git a/src/com/android/launcher3/notification/NotificationMainView.java b/src/com/android/launcher3/notification/NotificationMainView.java
index b67adbb..812268a 100644
--- a/src/com/android/launcher3/notification/NotificationMainView.java
+++ b/src/com/android/launcher3/notification/NotificationMainView.java
@@ -51,7 +51,7 @@
 @TargetApi(Build.VERSION_CODES.N)
 public class NotificationMainView extends FrameLayout implements SingleAxisSwipeDetector.Listener {
 
-    private static FloatProperty<NotificationMainView> CONTENT_TRANSLATION =
+    private static final FloatProperty<NotificationMainView> CONTENT_TRANSLATION =
             new FloatProperty<NotificationMainView>("contentTranslation") {
         @Override
         public void setValue(NotificationMainView view, float v) {
diff --git a/src/com/android/launcher3/pageindicators/WorkspacePageIndicator.java b/src/com/android/launcher3/pageindicators/WorkspacePageIndicator.java
index 654e593..0f2ca72 100644
--- a/src/com/android/launcher3/pageindicators/WorkspacePageIndicator.java
+++ b/src/com/android/launcher3/pageindicators/WorkspacePageIndicator.java
@@ -123,7 +123,7 @@
         mLauncher = Launcher.getLauncher(context);
         mLineHeight = res.getDimensionPixelSize(R.dimen.dynamic_grid_page_indicator_line_height);
 
-        boolean darkText = WallpaperColorInfo.getInstance(context).supportsDarkText();
+        boolean darkText = WallpaperColorInfo.INSTANCE.get(context).supportsDarkText();
         mActiveAlpha = darkText ? BLACK_ALPHA : WHITE_ALPHA;
         mLinePaint.setColor(darkText ? Color.BLACK : Color.WHITE);
     }
diff --git a/src/com/android/launcher3/pm/PackageInstallerCompat.java b/src/com/android/launcher3/pm/InstallSessionHelper.java
similarity index 94%
rename from src/com/android/launcher3/pm/PackageInstallerCompat.java
rename to src/com/android/launcher3/pm/InstallSessionHelper.java
index c7b27d9..186293f 100644
--- a/src/com/android/launcher3/pm/PackageInstallerCompat.java
+++ b/src/com/android/launcher3/pm/InstallSessionHelper.java
@@ -35,6 +35,7 @@
 import com.android.launcher3.util.IntArray;
 import com.android.launcher3.util.IntSet;
 import com.android.launcher3.util.LooperExecutor;
+import com.android.launcher3.util.MainThreadInitializedObject;
 import com.android.launcher3.util.PackageManagerHelper;
 import com.android.launcher3.util.PackageUserKey;
 
@@ -43,15 +44,20 @@
 import java.util.Iterator;
 import java.util.List;
 
-public class PackageInstallerCompat {
+/**
+ * Utility class to tracking install sessions
+ */
+public class InstallSessionHelper {
 
     // Set<String> of session ids of promise icons that have been added to the home screen
     // as FLAG_PROMISE_NEW_INSTALLS.
     protected static final String PROMISE_ICON_IDS = "promise_icon_ids";
 
-    private static final Object sInstanceLock = new Object();
     private static final boolean DEBUG = false;
-    private static PackageInstallerCompat sInstance;
+
+    public static final MainThreadInitializedObject<InstallSessionHelper> INSTANCE =
+            new MainThreadInitializedObject<>(InstallSessionHelper::new);
+
     private final LauncherApps mLauncherApps;
     private final Context mAppContext;
     private final IntSet mPromiseIconIds;
@@ -59,7 +65,7 @@
     private final PackageInstaller mInstaller;
     private final HashMap<String, Boolean> mSessionVerifiedMap = new HashMap<>();
 
-    public PackageInstallerCompat(Context context) {
+    public InstallSessionHelper(Context context) {
         mInstaller = context.getPackageManager().getPackageInstaller();
         mAppContext = context.getApplicationContext();
         mLauncherApps = context.getSystemService(LauncherApps.class);
@@ -70,15 +76,6 @@
         cleanUpPromiseIconIds();
     }
 
-    public static PackageInstallerCompat getInstance(Context context) {
-        synchronized (sInstanceLock) {
-            if (sInstance == null) {
-                sInstance = new PackageInstallerCompat(context);
-            }
-            return sInstance;
-        }
-    }
-
     public static UserHandle getUserHandle(SessionInfo info) {
         return Utilities.ATLEAST_Q ? info.getUser() : Process.myUserHandle();
     }
diff --git a/src/com/android/launcher3/pm/InstallSessionTracker.java b/src/com/android/launcher3/pm/InstallSessionTracker.java
index f157603..eb3ca73 100644
--- a/src/com/android/launcher3/pm/InstallSessionTracker.java
+++ b/src/com/android/launcher3/pm/InstallSessionTracker.java
@@ -15,9 +15,9 @@
  */
 package com.android.launcher3.pm;
 
+import static com.android.launcher3.pm.InstallSessionHelper.getUserHandle;
 import static com.android.launcher3.pm.PackageInstallInfo.STATUS_FAILED;
 import static com.android.launcher3.pm.PackageInstallInfo.STATUS_INSTALLED;
-import static com.android.launcher3.pm.PackageInstallerCompat.getUserHandle;
 
 import android.content.pm.PackageInstaller;
 import android.content.pm.PackageInstaller.SessionInfo;
@@ -31,10 +31,10 @@
     // Lazily initialized
     private SparseArray<PackageUserKey> mActiveSessions = null;
 
-    private final PackageInstallerCompat mInstallerCompat;
+    private final InstallSessionHelper mInstallerCompat;
     private final Callback mCallback;
 
-    InstallSessionTracker(PackageInstallerCompat installerCompat, Callback callback) {
+    InstallSessionTracker(InstallSessionHelper installerCompat, Callback callback) {
         mInstallerCompat = installerCompat;
         mCallback = callback;
     }
diff --git a/src/com/android/launcher3/pm/PackageInstallInfo.java b/src/com/android/launcher3/pm/PackageInstallInfo.java
index 6776ec4..7997d16 100644
--- a/src/com/android/launcher3/pm/PackageInstallInfo.java
+++ b/src/com/android/launcher3/pm/PackageInstallInfo.java
@@ -38,7 +38,7 @@
         this.packageName = info.getAppPackageName();
         this.componentName = new ComponentName(packageName, "");
         this.progress = (int) (info.getProgress() * 100f);
-        this.user = PackageInstallerCompat.getUserHandle(info);
+        this.user = InstallSessionHelper.getUserHandle(info);
     }
 
     public PackageInstallInfo(String packageName, int state, int progress, UserHandle user) {
diff --git a/src/com/android/launcher3/popup/SystemShortcut.java b/src/com/android/launcher3/popup/SystemShortcut.java
index 222c6c9..b580bd6 100644
--- a/src/com/android/launcher3/popup/SystemShortcut.java
+++ b/src/com/android/launcher3/popup/SystemShortcut.java
@@ -144,7 +144,7 @@
         }
     }
 
-    public static Factory<BaseDraggingActivity> INSTALL = (activity, itemInfo) -> {
+    public static final Factory<BaseDraggingActivity> INSTALL = (activity, itemInfo) -> {
         boolean supportsWebUI = (itemInfo instanceof WorkspaceItemInfo)
                 && ((WorkspaceItemInfo) itemInfo).hasStatusFlag(
                         WorkspaceItemInfo.FLAG_SUPPORTS_WEB_UI);
@@ -176,7 +176,7 @@
         }
     }
 
-    public static Factory<Launcher> DISMISS_PREDICTION = (launcher, itemInfo) -> {
+    public static final Factory<Launcher> DISMISS_PREDICTION = (launcher, itemInfo) -> {
         if (!FeatureFlags.ENABLE_PREDICTION_DISMISS.get()) return null;
         if (itemInfo.container != LauncherSettings.Favorites.CONTAINER_PREDICTION) return null;
         return new DismissPrediction(launcher, itemInfo);
diff --git a/src/com/android/launcher3/touch/ItemClickHandler.java b/src/com/android/launcher3/touch/ItemClickHandler.java
index 7e65840..f7ce160 100644
--- a/src/com/android/launcher3/touch/ItemClickHandler.java
+++ b/src/com/android/launcher3/touch/ItemClickHandler.java
@@ -51,7 +51,7 @@
 import com.android.launcher3.WorkspaceItemInfo;
 import com.android.launcher3.folder.Folder;
 import com.android.launcher3.folder.FolderIcon;
-import com.android.launcher3.pm.PackageInstallerCompat;
+import com.android.launcher3.pm.InstallSessionHelper;
 import com.android.launcher3.util.PackageManagerHelper;
 import com.android.launcher3.views.FloatingIconView;
 import com.android.launcher3.widget.PendingAppWidgetHostView;
@@ -169,8 +169,8 @@
     private static void startMarketIntentForPackage(View v, Launcher launcher, String packageName) {
         ItemInfo item = (ItemInfo) v.getTag();
         if (Utilities.ATLEAST_Q) {
-            PackageInstallerCompat pkgInstaller = PackageInstallerCompat.getInstance(launcher);
-            SessionInfo sessionInfo = pkgInstaller.getActiveSessionInfo(item.user, packageName);
+            SessionInfo sessionInfo = InstallSessionHelper.INSTANCE.get(launcher)
+                    .getActiveSessionInfo(item.user, packageName);
             if (sessionInfo != null) {
                 LauncherApps launcherApps = launcher.getSystemService(LauncherApps.class);
                 try {
diff --git a/src/com/android/launcher3/touch/ItemLongClickListener.java b/src/com/android/launcher3/touch/ItemLongClickListener.java
index aa02d0a..ba1bfa5 100644
--- a/src/com/android/launcher3/touch/ItemLongClickListener.java
+++ b/src/com/android/launcher3/touch/ItemLongClickListener.java
@@ -22,7 +22,6 @@
 import static com.android.launcher3.LauncherState.NORMAL;
 import static com.android.launcher3.LauncherState.OVERVIEW;
 
-import android.util.Log;
 import android.view.View;
 import android.view.View.OnLongClickListener;
 
@@ -34,19 +33,16 @@
 import com.android.launcher3.dragndrop.DragController;
 import com.android.launcher3.dragndrop.DragOptions;
 import com.android.launcher3.folder.Folder;
-import com.android.launcher3.testing.TestProtocol;
-
-import java.util.Arrays;
 
 /**
  * Class to handle long-clicks on workspace items and start drag as a result.
  */
 public class ItemLongClickListener {
 
-    public static OnLongClickListener INSTANCE_WORKSPACE =
+    public static final OnLongClickListener INSTANCE_WORKSPACE =
             ItemLongClickListener::onWorkspaceItemLongClick;
 
-    public static OnLongClickListener INSTANCE_ALL_APPS =
+    public static final OnLongClickListener INSTANCE_ALL_APPS =
             ItemLongClickListener::onAllAppsItemLongClick;
 
     private static boolean onWorkspaceItemLongClick(View v) {
diff --git a/src/com/android/launcher3/util/PackageManagerHelper.java b/src/com/android/launcher3/util/PackageManagerHelper.java
index 91f687e..2d56ce7 100644
--- a/src/com/android/launcher3/util/PackageManagerHelper.java
+++ b/src/com/android/launcher3/util/PackageManagerHelper.java
@@ -16,6 +16,8 @@
 
 package com.android.launcher3.util;
 
+import static android.content.pm.PackageManager.MATCH_SYSTEM_ONLY;
+
 import android.app.AppOpsManager;
 import android.content.ActivityNotFoundException;
 import android.content.ComponentName;
@@ -297,16 +299,13 @@
      */
     public static Pair<String, Resources> findSystemApk(String action, PackageManager pm) {
         final Intent intent = new Intent(action);
-        for (ResolveInfo info : pm.queryBroadcastReceivers(intent, 0)) {
-            if (info.activityInfo != null &&
-                    (info.activityInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0) {
-                final String packageName = info.activityInfo.packageName;
-                try {
-                    final Resources res = pm.getResourcesForApplication(packageName);
-                    return Pair.create(packageName, res);
-                } catch (NameNotFoundException e) {
-                    Log.w(TAG, "Failed to find resources for " + packageName);
-                }
+        for (ResolveInfo info : pm.queryBroadcastReceivers(intent, MATCH_SYSTEM_ONLY)) {
+            final String packageName = info.activityInfo.packageName;
+            try {
+                final Resources res = pm.getResourcesForApplication(packageName);
+                return Pair.create(packageName, res);
+            } catch (NameNotFoundException e) {
+                Log.w(TAG, "Failed to find resources for " + packageName);
             }
         }
         return null;
diff --git a/src/com/android/launcher3/util/Themes.java b/src/com/android/launcher3/util/Themes.java
index 0d02715..da59afe 100644
--- a/src/com/android/launcher3/util/Themes.java
+++ b/src/com/android/launcher3/util/Themes.java
@@ -36,7 +36,7 @@
 public class Themes {
 
     public static int getActivityThemeRes(Context context) {
-        WallpaperColorInfo wallpaperColorInfo = WallpaperColorInfo.getInstance(context);
+        WallpaperColorInfo wallpaperColorInfo = WallpaperColorInfo.INSTANCE.get(context);
         boolean darkTheme;
         if (Utilities.ATLEAST_Q) {
             Configuration configuration = context.getResources().getConfiguration();
diff --git a/src/com/android/launcher3/util/UiThreadHelper.java b/src/com/android/launcher3/util/UiThreadHelper.java
index ec87e79..0498052 100644
--- a/src/com/android/launcher3/util/UiThreadHelper.java
+++ b/src/com/android/launcher3/util/UiThreadHelper.java
@@ -29,26 +29,20 @@
  */
 public class UiThreadHelper {
 
-    private static Handler sHandler;
+    private static final MainThreadInitializedObject<Handler> HANDLER =
+            new MainThreadInitializedObject<>(
+                    c -> new Handler(UI_HELPER_EXECUTOR.getLooper(), new UiCallbacks(c)));
 
     private static final int MSG_HIDE_KEYBOARD = 1;
     private static final int MSG_SET_ORIENTATION = 2;
     private static final int MSG_RUN_COMMAND = 3;
 
-    private static Handler getHandler(Context context) {
-        if (sHandler == null) {
-            sHandler = new Handler(UI_HELPER_EXECUTOR.getLooper(),
-                    new UiCallbacks(context.getApplicationContext()));
-        }
-        return sHandler;
-    }
-
     public static void hideKeyboardAsync(Context context, IBinder token) {
-        Message.obtain(getHandler(context), MSG_HIDE_KEYBOARD, token).sendToTarget();
+        Message.obtain(HANDLER.get(context), MSG_HIDE_KEYBOARD, token).sendToTarget();
     }
 
     public static void setOrientationAsync(Activity activity, int orientation) {
-        Message.obtain(getHandler(activity), MSG_SET_ORIENTATION, orientation, 0, activity)
+        Message.obtain(HANDLER.get(activity), MSG_SET_ORIENTATION, orientation, 0, activity)
                 .sendToTarget();
     }
 
@@ -58,7 +52,7 @@
     }
 
     public static void runAsyncCommand(Context context, AsyncCommand command, int arg1, int arg2) {
-        Message.obtain(getHandler(context), MSG_RUN_COMMAND, arg1, arg2, command).sendToTarget();
+        Message.obtain(HANDLER.get(context), MSG_RUN_COMMAND, arg1, arg2, command).sendToTarget();
     }
 
     private static class UiCallbacks implements Handler.Callback {
diff --git a/src/com/android/launcher3/views/AbstractSlideInView.java b/src/com/android/launcher3/views/AbstractSlideInView.java
index 195a77a..9334c46 100644
--- a/src/com/android/launcher3/views/AbstractSlideInView.java
+++ b/src/com/android/launcher3/views/AbstractSlideInView.java
@@ -41,7 +41,7 @@
 public abstract class AbstractSlideInView extends AbstractFloatingView
         implements SingleAxisSwipeDetector.Listener {
 
-    protected static Property<AbstractSlideInView, Float> TRANSLATION_SHIFT =
+    protected static final Property<AbstractSlideInView, Float> TRANSLATION_SHIFT =
             new Property<AbstractSlideInView, Float>(Float.class, "translationShift") {
 
                 @Override
diff --git a/src/com/android/launcher3/views/ScrimView.java b/src/com/android/launcher3/views/ScrimView.java
index e64b2fb..8ce98f2 100644
--- a/src/com/android/launcher3/views/ScrimView.java
+++ b/src/com/android/launcher3/views/ScrimView.java
@@ -131,7 +131,7 @@
     public ScrimView(Context context, AttributeSet attrs) {
         super(context, attrs);
         mLauncher = Launcher.cast(Launcher.getLauncher(context));
-        mWallpaperColorInfo = WallpaperColorInfo.getInstance(context);
+        mWallpaperColorInfo = WallpaperColorInfo.INSTANCE.get(context);
         mEndScrim = Themes.getAttrColor(context, R.attr.allAppsScrimColor);
 
         mMaxScrimAlpha = 0.7f;
diff --git a/src/com/android/launcher3/widget/BaseWidgetSheet.java b/src/com/android/launcher3/widget/BaseWidgetSheet.java
index 72cddc7..6cae43d 100644
--- a/src/com/android/launcher3/widget/BaseWidgetSheet.java
+++ b/src/com/android/launcher3/widget/BaseWidgetSheet.java
@@ -182,7 +182,7 @@
         View view = new View(context);
         view.forceHasOverlappingRendering(false);
 
-        WallpaperColorInfo colors = WallpaperColorInfo.getInstance(context);
+        WallpaperColorInfo colors = WallpaperColorInfo.INSTANCE.get(context);
         int alpha = context.getResources().getInteger(R.integer.extracted_color_gradient_alpha);
         view.setBackgroundColor(setColorAlphaBound(colors.getSecondaryColor(), alpha));
 
diff --git a/src_ui_overrides/com/android/launcher3/uioverrides/WallpaperColorInfo.java b/src_ui_overrides/com/android/launcher3/uioverrides/WallpaperColorInfo.java
index b05e125..b3aa365 100644
--- a/src_ui_overrides/com/android/launcher3/uioverrides/WallpaperColorInfo.java
+++ b/src_ui_overrides/com/android/launcher3/uioverrides/WallpaperColorInfo.java
@@ -16,18 +16,19 @@
 
 package com.android.launcher3.uioverrides;
 
+import static android.app.WallpaperManager.FLAG_SYSTEM;
+
 import android.content.Context;
 import android.graphics.Color;
 import android.util.Pair;
 
+import com.android.launcher3.uioverrides.dynamicui.ColorExtractionAlgorithm;
 import com.android.launcher3.uioverrides.dynamicui.WallpaperColorsCompat;
 import com.android.launcher3.uioverrides.dynamicui.WallpaperManagerCompat;
-import com.android.launcher3.uioverrides.dynamicui.ColorExtractionAlgorithm;
+import com.android.launcher3.util.MainThreadInitializedObject;
 
 import java.util.ArrayList;
 
-import static android.app.WallpaperManager.FLAG_SYSTEM;
-
 public class WallpaperColorInfo implements WallpaperManagerCompat.OnColorsChangedListenerCompat {
 
     private static final int MAIN_COLOR_LIGHT = 0xffdadce0;
@@ -35,17 +36,9 @@
     private static final int MAIN_COLOR_REGULAR = 0xff000000;
 
     private static final int FALLBACK_COLOR = Color.WHITE;
-    private static final Object sInstanceLock = new Object();
-    private static WallpaperColorInfo sInstance;
 
-    public static WallpaperColorInfo getInstance(Context context) {
-        synchronized (sInstanceLock) {
-            if (sInstance == null) {
-                sInstance = new WallpaperColorInfo(context.getApplicationContext());
-            }
-            return sInstance;
-        }
-    }
+    public static final MainThreadInitializedObject<WallpaperColorInfo> INSTANCE =
+            new MainThreadInitializedObject<>(WallpaperColorInfo::new);
 
     private final ArrayList<OnChangeListener> mListeners = new ArrayList<>();
     private final WallpaperManagerCompat mWallpaperManager;
diff --git a/tests/src/com/android/launcher3/ui/widget/BindWidgetTest.java b/tests/src/com/android/launcher3/ui/widget/BindWidgetTest.java
index 357fbe1..21a654f 100644
--- a/tests/src/com/android/launcher3/ui/widget/BindWidgetTest.java
+++ b/tests/src/com/android/launcher3/ui/widget/BindWidgetTest.java
@@ -41,7 +41,7 @@
 import com.android.launcher3.LauncherAppWidgetInfo;
 import com.android.launcher3.LauncherAppWidgetProviderInfo;
 import com.android.launcher3.LauncherSettings;
-import com.android.launcher3.pm.PackageInstallerCompat;
+import com.android.launcher3.pm.InstallSessionHelper;
 import com.android.launcher3.tapl.Workspace;
 import com.android.launcher3.ui.AbstractLauncherUiTest;
 import com.android.launcher3.ui.TestViewHelpers;
@@ -302,7 +302,7 @@
 
         Set<String> activePackage = getOnUiThread(() -> {
             Set<String> packages = new HashSet<>();
-            PackageInstallerCompat.getInstance(mTargetContext).getActiveSessions()
+            InstallSessionHelper.INSTANCE.get(mTargetContext).getActiveSessions()
                     .keySet().forEach(packageUserKey -> packages.add(packageUserKey.mPackageName));
             return packages;
         });