diff --git a/quickstep/src/com/android/launcher3/uioverrides/QuickstepLauncher.java b/quickstep/src/com/android/launcher3/uioverrides/QuickstepLauncher.java
index 28c8980..8bd72d8 100644
--- a/quickstep/src/com/android/launcher3/uioverrides/QuickstepLauncher.java
+++ b/quickstep/src/com/android/launcher3/uioverrides/QuickstepLauncher.java
@@ -69,9 +69,13 @@
 import android.view.RemoteAnimationTarget;
 import android.view.View;
 import android.view.WindowManagerGlobal;
+import android.window.BackEvent;
+import android.window.OnBackAnimationCallback;
+import android.window.OnBackInvokedDispatcher;
 import android.window.SplashScreen;
 
 import androidx.annotation.BinderThread;
+import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
 import com.android.app.viewcapture.ViewCapture;
@@ -105,6 +109,8 @@
 import com.android.launcher3.statemanager.StateManager.StateHandler;
 import com.android.launcher3.taskbar.LauncherTaskbarUIController;
 import com.android.launcher3.taskbar.TaskbarManager;
+import com.android.launcher3.testing.TestLogging;
+import com.android.launcher3.testing.shared.TestProtocol;
 import com.android.launcher3.uioverrides.QuickstepWidgetHolder.QuickstepHolderFactory;
 import com.android.launcher3.uioverrides.states.QuickstepAtomicAnimationFactory;
 import com.android.launcher3.uioverrides.touchcontrollers.NavBarToHomeTouchController;
@@ -623,6 +629,29 @@
         }
     }
 
+    @Override
+    protected void registerBackDispatcher() {
+        getOnBackInvokedDispatcher().registerOnBackInvokedCallback(
+                OnBackInvokedDispatcher.PRIORITY_DEFAULT,
+                new OnBackAnimationCallback() {
+                    @Override
+                    public void onBackInvoked() {
+                        onBackPressed();
+                        TestLogging.recordEvent(TestProtocol.SEQUENCE_MAIN, "onBackInvoked");
+                    }
+
+                    @Override
+                    public void onBackProgressed(@NonNull BackEvent backEvent) {
+                        QuickstepLauncher.this.onBackProgressed(backEvent.getProgress());
+                    }
+
+                    @Override
+                    public void onBackCancelled() {
+                        QuickstepLauncher.this.onBackCancelled();
+                    }
+                });
+    }
+
     private void onTaskbarInAppDisplayProgressUpdate(float progress, int flag) {
         if (mTaskbarManager == null
                 || mTaskbarManager.getCurrentActivityContext() == null
diff --git a/src/com/android/launcher3/BaseActivity.java b/src/com/android/launcher3/BaseActivity.java
index 61707df..e71391f 100644
--- a/src/com/android/launcher3/BaseActivity.java
+++ b/src/com/android/launcher3/BaseActivity.java
@@ -176,14 +176,7 @@
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        if (Utilities.ATLEAST_T) {
-            getOnBackInvokedDispatcher().registerOnBackInvokedCallback(
-                    OnBackInvokedDispatcher.PRIORITY_DEFAULT,
-                    () -> {
-                        onBackPressed();
-                        TestLogging.recordEvent(TestProtocol.SEQUENCE_MAIN, "onBackInvoked");
-                    });
-        }
+        registerBackDispatcher();
     }
 
     @Override
@@ -246,6 +239,17 @@
 
     }
 
+    protected void registerBackDispatcher() {
+        if (Utilities.ATLEAST_T) {
+            getOnBackInvokedDispatcher().registerOnBackInvokedCallback(
+                    OnBackInvokedDispatcher.PRIORITY_DEFAULT,
+                    () -> {
+                        onBackPressed();
+                        TestLogging.recordEvent(TestProtocol.SEQUENCE_MAIN, "onBackInvoked");
+                    });
+        }
+    }
+
     public boolean isStarted() {
         return (mActivityFlags & ACTIVITY_STATE_STARTED) != 0;
     }
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index 43772e4..1563130 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -120,6 +120,7 @@
 import android.widget.Toast;
 
 import androidx.annotation.CallSuper;
+import androidx.annotation.FloatRange;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.annotation.StringRes;
@@ -2065,6 +2066,14 @@
         mStateManager.getState().onBackPressed(this);
     }
 
+    protected void onBackProgressed(@FloatRange(from = 0.0, to = 1.0) float backProgress) {
+        mStateManager.getState().onBackProgressed(this, backProgress);
+    }
+
+    protected void onBackCancelled() {
+        mStateManager.getState().onBackCancelled(this);
+    }
+
     protected void onScreenOff() {
         // Reset AllApps to its initial state only if we are not in the middle of
         // processing a multi-step drop
diff --git a/src/com/android/launcher3/LauncherState.java b/src/com/android/launcher3/LauncherState.java
index 5dddc6f..b9e4c17 100644
--- a/src/com/android/launcher3/LauncherState.java
+++ b/src/com/android/launcher3/LauncherState.java
@@ -34,6 +34,8 @@
 import android.graphics.Color;
 import android.view.animation.Interpolator;
 
+import androidx.annotation.FloatRange;
+
 import com.android.launcher3.statemanager.BaseState;
 import com.android.launcher3.statemanager.StateManager;
 import com.android.launcher3.states.HintState;
@@ -342,6 +344,27 @@
         }
     }
 
+    /**
+     * Find {@link StateManager} and target {@link LauncherState} to handle back progress in
+     * predictive back gesture.
+     */
+    public void onBackProgressed(
+            Launcher launcher, @FloatRange(from = 0.0, to = 1.0) float backProgress) {
+        StateManager<LauncherState> lsm = launcher.getStateManager();
+        LauncherState toState = lsm.getLastState();
+        lsm.onBackProgressed(toState, backProgress);
+    }
+
+    /**
+     * Find {@link StateManager} and target {@link LauncherState} to handle backProgress in
+     * predictive back gesture.
+     */
+    public void onBackCancelled(Launcher launcher) {
+        StateManager<LauncherState> lsm = launcher.getStateManager();
+        LauncherState toState = lsm.getLastState();
+        lsm.onBackCancelled(toState);
+    }
+
     public static abstract class PageAlphaProvider {
 
         public final Interpolator interpolator;
diff --git a/src/com/android/launcher3/allapps/AllAppsTransitionController.java b/src/com/android/launcher3/allapps/AllAppsTransitionController.java
index 9930abe..24bfedb 100644
--- a/src/com/android/launcher3/allapps/AllAppsTransitionController.java
+++ b/src/com/android/launcher3/allapps/AllAppsTransitionController.java
@@ -15,6 +15,7 @@
  */
 package com.android.launcher3.allapps;
 
+import static com.android.launcher3.LauncherAnimUtils.SCALE_PROPERTY;
 import static com.android.launcher3.LauncherAnimUtils.VIEW_TRANSLATE_Y;
 import static com.android.launcher3.LauncherState.ALL_APPS;
 import static com.android.launcher3.LauncherState.ALL_APPS_CONTENT;
@@ -33,11 +34,15 @@
 import android.view.View;
 import android.view.animation.Interpolator;
 
+import androidx.annotation.FloatRange;
+
 import com.android.launcher3.DeviceProfile;
 import com.android.launcher3.DeviceProfile.OnDeviceProfileChangeListener;
 import com.android.launcher3.Launcher;
 import com.android.launcher3.LauncherState;
+import com.android.launcher3.anim.AnimatedFloat;
 import com.android.launcher3.anim.AnimatorListeners;
+import com.android.launcher3.anim.Interpolators;
 import com.android.launcher3.anim.PendingAnimation;
 import com.android.launcher3.anim.PropertySetter;
 import com.android.launcher3.statemanager.StateManager.StateHandler;
@@ -61,6 +66,8 @@
         implements StateHandler<LauncherState>, OnDeviceProfileChangeListener {
     // This constant should match the second derivative of the animator interpolator.
     public static final float INTERP_COEFF = 1.7f;
+    private static final float SWIPE_ALL_APPS_TO_HOME_MIN_SCALE = 0.9f;
+    private static final int REVERT_SWIPE_ALL_APPS_TO_HOME_ANIMATION_DURATION_MS = 200;
 
     public static final FloatProperty<AllAppsTransitionController> ALL_APPS_PROGRESS =
             new FloatProperty<AllAppsTransitionController>("allAppsProgress") {
@@ -139,6 +146,7 @@
     private ActivityAllAppsContainerView<Launcher> mAppsView;
 
     private final Launcher mLauncher;
+    private final AnimatedFloat mAllAppScale = new AnimatedFloat(this::onScaleProgressChanged);
     private boolean mIsVerticalLayout;
 
     // Whether this class should take care of closing the keyboard.
@@ -232,6 +240,52 @@
         onProgressAnimationEnd();
     }
 
+    @Override
+    public void onBackProgressed(
+            LauncherState toState, @FloatRange(from = 0.0, to = 1.0) float backProgress) {
+        if (!mLauncher.isInState(ALL_APPS) || !NORMAL.equals(toState)) {
+            return;
+        }
+
+        float deceleratedProgress =
+                Interpolators.PREDICTIVE_BACK_DECELERATED_EASE.getInterpolation(backProgress);
+        float scaleProgress = SWIPE_ALL_APPS_TO_HOME_MIN_SCALE
+                + (1 - SWIPE_ALL_APPS_TO_HOME_MIN_SCALE) * (1 - deceleratedProgress);
+
+        mAllAppScale.updateValue(scaleProgress);
+    }
+
+    @Override
+    public void onBackCancelled(LauncherState toState) {
+        if (!mLauncher.isInState(ALL_APPS) || !NORMAL.equals(toState)) {
+            return;
+        }
+
+        // TODO: once ag/20649618 is picked into tm-qpr, we don't need to animate back on cancel
+        // swipe because framework will do that for us in {@link #onBackProgressed}.
+        animateAllAppsToNoScale();
+    }
+
+    private void onScaleProgressChanged() {
+        final float scaleProgress = mAllAppScale.value;
+        SCALE_PROPERTY.set(mLauncher.getAppsView(), scaleProgress);
+        mLauncher.getScrimView().setScrimHeaderScale(scaleProgress);
+
+        AllAppsRecyclerView rv = mLauncher.getAppsView().getActiveRecyclerView();
+        if (rv != null && rv.getScrollbar() != null) {
+            rv.getScrollbar().setVisibility(scaleProgress < 1f ? View.INVISIBLE : View.VISIBLE);
+        }
+
+        // TODO(b/264906511): We need to disable view clipping on all apps' parent views so
+        //  that the extra roll of app icons are displayed.
+    }
+
+    private void animateAllAppsToNoScale() {
+        mAllAppScale.animateToValue(1f)
+                .setDuration(REVERT_SWIPE_ALL_APPS_TO_HOME_ANIMATION_DURATION_MS)
+                .start();
+    }
+
     /**
      * Creates an animation which updates the vertical transition progress and updates all the
      * dependent UI using various animation events
@@ -258,6 +312,8 @@
                 if (config.userControlled && success && mShouldControlKeyboard) {
                     mLauncher.getAppsView().getSearchUiManager().getEditText().hideKeyboard();
                 }
+
+                mAllAppScale.updateValue(1f);
             });
         }
 
diff --git a/src/com/android/launcher3/allapps/BaseAllAppsContainerView.java b/src/com/android/launcher3/allapps/BaseAllAppsContainerView.java
index 00e89ba..4878077 100644
--- a/src/com/android/launcher3/allapps/BaseAllAppsContainerView.java
+++ b/src/com/android/launcher3/allapps/BaseAllAppsContainerView.java
@@ -808,7 +808,7 @@
     }
 
     @Override
-    public void drawOnScrim(Canvas canvas) {
+    public void drawOnScrimWithScale(Canvas canvas, float scale) {
         boolean isTablet = mActivityContext.getDeviceProfile().isTablet;
 
         // Draw full background panel for tablets.
@@ -833,7 +833,9 @@
         if (mHeaderPaint.getColor() == mScrimColor || mHeaderPaint.getColor() == 0) {
             return;
         }
-        int bottom = getHeaderBottom() + getVisibleContainerView().getPaddingTop();
+        final float offset = (getVisibleContainerView().getHeight() * (1 - scale) / 2);
+        final float bottom =
+                scale * (getHeaderBottom() + getVisibleContainerView().getPaddingTop()) + offset;
         FloatingHeaderView headerView = getFloatingHeaderView();
         if (isTablet) {
             // Start adding header protection if search bar or tabs will attach to the top.
diff --git a/src/com/android/launcher3/anim/Interpolators.java b/src/com/android/launcher3/anim/Interpolators.java
index b55a1e4..e886543 100644
--- a/src/com/android/launcher3/anim/Interpolators.java
+++ b/src/com/android/launcher3/anim/Interpolators.java
@@ -56,6 +56,8 @@
 
     public static final Interpolator DECELERATED_EASE = new PathInterpolator(0, 0, .2f, 1f);
     public static final Interpolator ACCELERATED_EASE = new PathInterpolator(0.4f, 0, 1f, 1f);
+    public static final Interpolator PREDICTIVE_BACK_DECELERATED_EASE =
+            new PathInterpolator(0, 0, 0, 1f);
 
     /**
      * The default emphasized interpolator. Used for hero / emphasized movement of content.
diff --git a/src/com/android/launcher3/statemanager/StateManager.java b/src/com/android/launcher3/statemanager/StateManager.java
index ad1e7f0..34ac8c2 100644
--- a/src/com/android/launcher3/statemanager/StateManager.java
+++ b/src/com/android/launcher3/statemanager/StateManager.java
@@ -28,6 +28,8 @@
 import android.os.Handler;
 import android.os.Looper;
 
+import androidx.annotation.FloatRange;
+
 import com.android.launcher3.anim.AnimationSuccessListener;
 import com.android.launcher3.anim.AnimatorPlaybackController;
 import com.android.launcher3.anim.PendingAnimation;
@@ -195,6 +197,21 @@
         }
     }
 
+    /** Handles backProgress in predictive back gesture by passing it to state handlers. */
+    public void onBackProgressed(
+            STATE_TYPE toState, @FloatRange(from = 0.0, to = 1.0) float backProgress) {
+        for (StateHandler handler : getStateHandlers()) {
+            handler.onBackProgressed(toState, backProgress);
+        }
+    }
+
+    /** Handles back cancelled event in predictive back gesture by passing it to state handlers. */
+    public void onBackCancelled(STATE_TYPE toState) {
+        for (StateHandler handler : getStateHandlers()) {
+            handler.onBackCancelled(toState);
+        }
+    }
+
     private void goToState(
             STATE_TYPE state, boolean animated, long delay, AnimatorListener listener) {
         animated &= areAnimatorsEnabled();
@@ -586,6 +603,13 @@
          */
         void setStateWithAnimation(
                 STATE_TYPE toState, StateAnimationConfig config, PendingAnimation animation);
+
+        /** Handles backProgress in predictive back gesture for target state. */
+        default void onBackProgressed(
+                STATE_TYPE toState, @FloatRange(from = 0.0, to = 1.0) float backProgress) {};
+
+        /** Handles back cancelled event in predictive back gesture for target state.  */
+        default void onBackCancelled(STATE_TYPE toState) {};
     }
 
     public interface StateListener<STATE_TYPE> {
diff --git a/src/com/android/launcher3/views/ScrimView.java b/src/com/android/launcher3/views/ScrimView.java
index 4c0bfde..870ff12 100644
--- a/src/com/android/launcher3/views/ScrimView.java
+++ b/src/com/android/launcher3/views/ScrimView.java
@@ -46,6 +46,7 @@
     private int mBackgroundColor;
     private boolean mIsVisible = true;
     private boolean mLastDispatchedOpaqueness;
+    private float mHeaderScale = 1f;
 
     public ScrimView(Context context, AttributeSet attrs) {
         super(context, attrs);
@@ -91,7 +92,16 @@
     protected void onDraw(Canvas canvas) {
         super.onDraw(canvas);
         if (mDrawingController != null) {
-            mDrawingController.drawOnScrim(canvas);
+            mDrawingController.drawOnScrimWithScale(canvas, mHeaderScale);
+        }
+    }
+
+    /** Set scrim header's scale and bottom offset. */
+    public void setScrimHeaderScale(float scale) {
+        boolean hasChanged = mHeaderScale != scale;
+        mHeaderScale = scale;
+        if (hasChanged) {
+            invalidate();
         }
     }
 
@@ -176,6 +186,6 @@
         /**
          * Called inside ScrimView#OnDraw
          */
-        void drawOnScrim(Canvas canvas);
+        void drawOnScrimWithScale(Canvas canvas, float scale);
     }
 }