Merge "Animation for bubbles home gesture" into tm-qpr-dev

libs/WindowManager/Shell/src/com/android/wm/shell/animation/Interpolators.java

@@ -52,6 +52,19 @@ public class Interpolators {
      */
     public static final Interpolator LINEAR_OUT_SLOW_IN = new PathInterpolator(0f, 0f, 0.2f, 1f);
 
+    /**
+     * The accelerated emphasized interpolator. Used for hero / emphasized movement of content that
+     * is disappearing e.g. when moving off screen.
+     */
+    public static final Interpolator EMPHASIZED_ACCELERATE = new PathInterpolator(
+            0.3f, 0f, 0.8f, 0.15f);
+
+    /**
+     * The decelerating emphasized interpolator. Used for hero / emphasized movement of content that
+     * is appearing e.g. when coming from off screen
+     */
+    public static final Interpolator EMPHASIZED_DECELERATE = new PathInterpolator(
+            0.05f, 0.7f, 0.1f, 1f);
     /**
      * Interpolator to be used when animating a move based on a click. Pair with enough duration.
      */

libs/WindowManager/Shell/src/com/android/wm/shell/bubbles/BubbleController.java

@@ -1512,7 +1512,7 @@ public class BubbleController {
         public void onImeVisibilityChanged(boolean imeVisible, int imeHeight) {
             mBubblePositioner.setImeVisible(imeVisible, imeHeight);
             if (mStackView != null) {
-                mStackView.animateForIme(imeVisible);
+                mStackView.setImeVisible(imeVisible);
             }
         }
     }

libs/WindowManager/Shell/src/com/android/wm/shell/bubbles/BubbleDebugConfig.java

@@ -46,6 +46,9 @@ public class BubbleDebugConfig {
     static final boolean DEBUG_OVERFLOW = false;
     static final boolean DEBUG_USER_EDUCATION = false;
     static final boolean DEBUG_POSITIONER = false;
+    public static final boolean DEBUG_COLLAPSE_ANIMATOR = false;
+    static final boolean DEBUG_BUBBLE_GESTURE = false;
+    public static boolean DEBUG_EXPANDED_VIEW_DRAGGING = false;
 
     private static final boolean FORCE_SHOW_USER_EDUCATION = false;
     private static final String FORCE_SHOW_USER_EDUCATION_SETTING =

libs/WindowManager/Shell/src/com/android/wm/shell/bubbles/BubbleExpandedView.java

@@ -43,10 +43,13 @@ import android.graphics.CornerPathEffect;
 import android.graphics.Outline;
 import android.graphics.Paint;
 import android.graphics.Picture;
+import android.graphics.PointF;
 import android.graphics.Rect;
 import android.graphics.drawable.ShapeDrawable;
 import android.os.RemoteException;
 import android.util.AttributeSet;
+import android.util.FloatProperty;
+import android.util.IntProperty;
 import android.util.Log;
 import android.util.TypedValue;
 import android.view.LayoutInflater;
@@ -75,6 +78,48 @@ import java.io.PrintWriter;
 public class BubbleExpandedView extends LinearLayout {
     private static final String TAG = TAG_WITH_CLASS_NAME ? "BubbleExpandedView" : TAG_BUBBLES;
 
+    /** {@link IntProperty} for updating bottom clip */
+    public static final IntProperty<BubbleExpandedView> BOTTOM_CLIP_PROPERTY =
+            new IntProperty<BubbleExpandedView>("bottomClip") {
+                @Override
+                public void setValue(BubbleExpandedView expandedView, int value) {
+                    expandedView.setBottomClip(value);
+                }
+
+                @Override
+                public Integer get(BubbleExpandedView expandedView) {
+                    return expandedView.mBottomClip;
+                }
+            };
+
+    /** {@link FloatProperty} for updating taskView or overflow alpha */
+    public static final FloatProperty<BubbleExpandedView> CONTENT_ALPHA =
+            new FloatProperty<BubbleExpandedView>("contentAlpha") {
+                @Override
+                public void setValue(BubbleExpandedView expandedView, float value) {
+                    expandedView.setContentAlpha(value);
+                }
+
+                @Override
+                public Float get(BubbleExpandedView expandedView) {
+                    return expandedView.getContentAlpha();
+                }
+            };
+
+    /** {@link FloatProperty} for updating manage button alpha */
+    public static final FloatProperty<BubbleExpandedView> MANAGE_BUTTON_ALPHA =
+            new FloatProperty<BubbleExpandedView>("manageButtonAlpha") {
+                @Override
+                public void setValue(BubbleExpandedView expandedView, float value) {
+                    expandedView.mManageButton.setAlpha(value);
+                }
+
+                @Override
+                public Float get(BubbleExpandedView expandedView) {
+                    return expandedView.mManageButton.getAlpha();
+                }
+            };
+
     // The triangle pointing to the expanded view
     private View mPointerView;
     @Nullable private int[] mExpandedViewContainerLocation;
@@ -90,7 +135,7 @@ public class BubbleExpandedView extends LinearLayout {
 
     /**
      * Whether we want the {@code TaskView}'s content to be visible (alpha = 1f). If
-     * {@link #mIsAlphaAnimating} is true, this may not reflect the {@code TaskView}'s actual alpha
+     * {@link #mIsAnimating} is true, this may not reflect the {@code TaskView}'s actual alpha
      * value until the animation ends.
      */
     private boolean mIsContentVisible = false;
@@ -99,12 +144,13 @@ public class BubbleExpandedView extends LinearLayout {
      * Whether we're animating the {@code TaskView}'s alpha value. If so, we will hold off on
      * applying alpha changes from {@link #setContentVisibility} until the animation ends.
      */
-    private boolean mIsAlphaAnimating = false;
+    private boolean mIsAnimating = false;
 
     private int mPointerWidth;
     private int mPointerHeight;
     private float mPointerRadius;
     private float mPointerOverlap;
+    private final PointF mPointerPos = new PointF();
     private CornerPathEffect mPointerEffect;
     private ShapeDrawable mCurrentPointer;
     private ShapeDrawable mTopPointer;
@@ -113,11 +159,13 @@ public class BubbleExpandedView extends LinearLayout {
     private float mCornerRadius = 0f;
     private int mBackgroundColorFloating;
     private boolean mUsingMaxHeight;
-
+    private int mTopClip = 0;
+    private int mBottomClip = 0;
     @Nullable private Bubble mBubble;
     private PendingIntent mPendingIntent;
     // TODO(b/170891664): Don't use a flag, set the BubbleOverflow object instead
     private boolean mIsOverflow;
+    private boolean mIsClipping;
 
     private BubbleController mController;
     private BubbleStackView mStackView;
@@ -268,7 +316,8 @@ public class BubbleExpandedView extends LinearLayout {
         mExpandedViewContainer.setOutlineProvider(new ViewOutlineProvider() {
             @Override
             public void getOutline(View view, Outline outline) {
-                outline.setRoundRect(0, 0, view.getWidth(), view.getHeight(), mCornerRadius);
+                Rect clip = new Rect(0, mTopClip, view.getWidth(), view.getHeight() - mBottomClip);
+                outline.setRoundRect(clip, mCornerRadius);
             }
         });
         mExpandedViewContainer.setClipToOutline(true);
@@ -429,7 +478,7 @@ public class BubbleExpandedView extends LinearLayout {
      * ordering surfaces during animations. When content is drawn on top of the app (e.g. bubble
      * being dragged out, the manage menu) this is set to false, otherwise it should be true.
      */
-    void setSurfaceZOrderedOnTop(boolean onTop) {
+    public void setSurfaceZOrderedOnTop(boolean onTop) {
         if (mTaskView == null) {
             return;
         }
@@ -510,12 +559,12 @@ public class BubbleExpandedView extends LinearLayout {
     }
 
     /**
-     * Whether we are currently animating the {@code TaskView}'s alpha value. If this is set to
+     * Whether we are currently animating the {@code TaskView}. If this is set to
      * true, calls to {@link #setContentVisibility} will not be applied until this is set to false
      * again.
      */
-    void setAlphaAnimating(boolean animating) {
+    public void setAnimating(boolean animating) {
-        mIsAlphaAnimating = animating;
+        mIsAnimating = animating;
 
         // If we're done animating, apply the correct
         if (!animating) {
@@ -524,15 +573,128 @@ public class BubbleExpandedView extends LinearLayout {
     }
 
     /**
-     * Sets the alpha of the underlying {@code TaskView}, since changing the expanded view's alpha
+     * Get alpha from underlying {@code TaskView} if this view is for a bubble.
-     * does not affect the {@code TaskView} since it uses a Surface.
+     * Or get alpha for the overflow view if this view is for overflow.
+     *
+     * @return alpha for the content being shown
      */
-    void setTaskViewAlpha(float alpha) {
+    public float getContentAlpha() {
+        if (mIsOverflow) {
+            return mOverflowView.getAlpha();
+        }
         if (mTaskView != null) {
+            return mTaskView.getAlpha();
+        }
+        return 1f;
+    }
+
+    /**
+     * Set alpha of the underlying {@code TaskView} if this view is for a bubble.
+     * Or set alpha for the overflow view if this view is for overflow.
+     *
+     * Changing expanded view's alpha does not affect the {@code TaskView} since it uses a Surface.
+     */
+    public void setContentAlpha(float alpha) {
+        if (mIsOverflow) {
+            mOverflowView.setAlpha(alpha);
+        } else if (mTaskView != null) {
             mTaskView.setAlpha(alpha);
         }
-        mPointerView.setAlpha(alpha);
+    }
-        setAlpha(alpha);
+
+    /**
+     * Set translation Y for the expanded view content.
+     * Excludes manage button and pointer.
+     */
+    public void setContentTranslationY(float translationY) {
+        mExpandedViewContainer.setTranslationY(translationY);
+
+        // Left or right pointer can become detached when moving the view up
+        if (translationY <= 0 && (isShowingLeftPointer() || isShowingRightPointer())) {
+            // Y coordinate where the pointer would start to get detached from the expanded view.
+            // Takes into account bottom clipping and rounded corners
+            float detachPoint =
+                    mExpandedViewContainer.getBottom() - mBottomClip - mCornerRadius + translationY;
+            float pointerBottom = mPointerPos.y + mPointerHeight;
+            // If pointer bottom is past detach point, move it in by that many pixels
+            float horizontalShift = 0;
+            if (pointerBottom > detachPoint) {
+                horizontalShift = pointerBottom - detachPoint;
+            }
+            if (isShowingLeftPointer()) {
+                // Move left pointer right
+                movePointerBy(horizontalShift, 0);
+            } else {
+                // Move right pointer left
+                movePointerBy(-horizontalShift, 0);
+            }
+            // Hide pointer if it is moved by entire width
+            mPointerView.setVisibility(
+                    horizontalShift > mPointerWidth ? View.INVISIBLE : View.VISIBLE);
+        }
+    }
+
+    /**
+     * Update alpha value for the manage button
+     */
+    public void setManageButtonAlpha(float alpha) {
+        mManageButton.setAlpha(alpha);
+    }
+
+    /**
+     * Set {@link #setTranslationY(float) translationY} for the manage button
+     */
+    public void setManageButtonTranslationY(float translationY) {
+        mManageButton.setTranslationY(translationY);
+    }
+
+    /**
+     * Set top clipping for the view
+     */
+    public void setTopClip(int clip) {
+        mTopClip = clip;
+        onContainerClipUpdate();
+    }
+
+    /**
+     * Set bottom clipping for the view
+     */
+    public void setBottomClip(int clip) {
+        mBottomClip = clip;
+        onContainerClipUpdate();
+    }
+
+    private void onContainerClipUpdate() {
+        if (mTopClip == 0 && mBottomClip == 0) {
+            if (mIsClipping) {
+                mIsClipping = false;
+                if (mTaskView != null) {
+                    mTaskView.setClipBounds(null);
+                    mTaskView.setEnableSurfaceClipping(false);
+                }
+                mExpandedViewContainer.invalidateOutline();
+            }
+        } else {
+            if (!mIsClipping) {
+                mIsClipping = true;
+                if (mTaskView != null) {
+                    mTaskView.setEnableSurfaceClipping(true);
+                }
+            }
+            mExpandedViewContainer.invalidateOutline();
+            if (mTaskView != null) {
+                mTaskView.setClipBounds(new Rect(0, mTopClip, mTaskView.getWidth(),
+                        mTaskView.getHeight() - mBottomClip));
+            }
+        }
+    }
+
+    /**
+     * Move pointer from base position
+     */
+    public void movePointerBy(float x, float y) {
+        mPointerView.setTranslationX(mPointerPos.x + x);
+        mPointerView.setTranslationY(mPointerPos.y + y);
     }
 
     /**
@@ -543,13 +705,13 @@ public class BubbleExpandedView extends LinearLayout {
      * Note that this contents visibility doesn't affect visibility at {@link android.view.View},
      * and setting {@code false} actually means rendering the contents in transparent.
      */
-    void setContentVisibility(boolean visibility) {
+    public void setContentVisibility(boolean visibility) {
         if (DEBUG_BUBBLE_EXPANDED_VIEW) {
             Log.d(TAG, "setContentVisibility: visibility=" + visibility
                     + " bubble=" + getBubbleKey());
         }
         mIsContentVisible = visibility;
-        if (mTaskView != null && !mIsAlphaAnimating) {
+        if (mTaskView != null && !mIsAnimating) {
             mTaskView.setAlpha(visibility ? 1f : 0f);
             mPointerView.setAlpha(visibility ? 1f : 0f);
         }
@@ -560,6 +722,44 @@ public class BubbleExpandedView extends LinearLayout {
         return mTaskView;
     }
 
+    @VisibleForTesting
+    public BubbleOverflowContainerView getOverflow() {
+        return mOverflowView;
+    }
+
+
+    /**
+     * Return content height: taskView or overflow.
+     * Takes into account clippings set by {@link #setTopClip(int)} and {@link #setBottomClip(int)}
+     *
+     * @return if bubble is for overflow, return overflow height, otherwise return taskView height
+     */
+    public int getContentHeight() {
+        if (mIsOverflow) {
+            return mOverflowView.getHeight() - mTopClip - mBottomClip;
+        }
+        if (mTaskView != null) {
+            return mTaskView.getHeight() - mTopClip - mBottomClip;
+        }
+        return 0;
+    }
+
+    /**
+     * Return bottom position of the content on screen
+     *
+     * @return if bubble is for overflow, return value for overflow, otherwise taskView
+     */
+    public int getContentBottomOnScreen() {
+        Rect out = new Rect();
+        if (mIsOverflow) {
+            mOverflowView.getBoundsOnScreen(out);
+        }
+        if (mTaskView != null) {
+            mTaskView.getBoundsOnScreen(out);
+        }
+        return out.bottom;
+    }
+
     int getTaskId() {
         return mTaskId;
     }
@@ -728,27 +928,47 @@ public class BubbleExpandedView extends LinearLayout {
         post(() -> {
             mCurrentPointer = showVertically ? onLeft ? mLeftPointer : mRightPointer : mTopPointer;
             updatePointerView();
-            float pointerY;
-            float pointerX;
             if (showVertically) {
-                pointerY = bubbleCenter - (mPointerWidth / 2f);
+                mPointerPos.y = bubbleCenter - (mPointerWidth / 2f);
-                pointerX = onLeft
+                mPointerPos.x = onLeft
                         ? -mPointerHeight + mPointerOverlap
                         : getWidth() - mPaddingRight - mPointerOverlap;
             } else {
-                pointerY = mPointerOverlap;
+                mPointerPos.y = mPointerOverlap;
-                pointerX = bubbleCenter - (mPointerWidth / 2f);
+                mPointerPos.x = bubbleCenter - (mPointerWidth / 2f);
             }
             if (animate) {
-                mPointerView.animate().translationX(pointerX).translationY(pointerY).start();
+                mPointerView.animate().translationX(mPointerPos.x).translationY(
+                        mPointerPos.y).start();
             } else {
-                mPointerView.setTranslationY(pointerY);
+                mPointerView.setTranslationY(mPointerPos.y);
-                mPointerView.setTranslationX(pointerX);
+                mPointerView.setTranslationX(mPointerPos.x);
                 mPointerView.setVisibility(VISIBLE);
             }
         });
     }
 
+    /**
+     * Return true if pointer is shown on the left
+     */
+    public boolean isShowingLeftPointer() {
+        return mCurrentPointer == mLeftPointer;
+    }
+
+    /**
+     * Return true if pointer is shown on the right
+     */
+    public boolean isShowingRightPointer() {
+        return mCurrentPointer == mRightPointer;
+    }
+
+    /**
+     * Return width of the current pointer
+     */
+    public int getPointerWidth() {
+        return mPointerWidth;
+    }
+
     /**
      * Position of the manage button displayed in the expanded view. Used for placing user
      * education about the manage button.

libs/WindowManager/Shell/src/com/android/wm/shell/bubbles/BubblePositioner.java

@@ -344,6 +344,14 @@ public class BubblePositioner {
         return mImeVisible ? mImeHeight : 0;
     }
 
+    /** Return top position of the IME if it's visible */
+    public int getImeTop() {
+        if (mImeVisible) {
+            return getScreenRect().bottom - getImeHeight() - getInsets().bottom;
+        }
+        return 0;
+    }
+
     /** Sets whether the IME is visible. **/
     public void setImeVisible(boolean visible, int height) {
         mImeVisible = visible;
@@ -706,4 +714,21 @@ public class BubblePositioner {
     public void setPinnedLocation(PointF point) {
         mPinLocation = point;
     }
+
+    /**
+     * Navigation bar has an area where system gestures can be started from.
+     *
+     * @return {@link Rect} for system navigation bar gesture zone
+     */
+    public Rect getNavBarGestureZone() {
+        // Gesture zone height from the bottom
+        int gestureZoneHeight = mContext.getResources().getDimensionPixelSize(
+                com.android.internal.R.dimen.navigation_bar_gesture_height);
+        Rect screen = getScreenRect();
+        return new Rect(
+                screen.left,
+                screen.bottom - gestureZoneHeight,
+                screen.right,
+                screen.bottom);
+    }
 }

libs/WindowManager/Shell/src/com/android/wm/shell/bubbles/BubbleStackView.java

@@ -44,6 +44,7 @@ import android.graphics.Rect;
 import android.graphics.RectF;
 import android.graphics.drawable.ColorDrawable;
 import android.os.Bundle;
+import android.os.SystemProperties;
 import android.provider.Settings;
 import android.util.Log;
 import android.view.Choreographer;
@@ -56,6 +57,7 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.view.ViewOutlineProvider;
 import android.view.ViewTreeObserver;
+import android.view.WindowManagerPolicyConstants;
 import android.view.accessibility.AccessibilityNodeInfo;
 import android.view.accessibility.AccessibilityNodeInfo.AccessibilityAction;
 import android.widget.FrameLayout;
@@ -75,8 +77,12 @@ import com.android.internal.util.FrameworkStatsLog;
 import com.android.wm.shell.R;
 import com.android.wm.shell.animation.Interpolators;
 import com.android.wm.shell.animation.PhysicsAnimator;
+import com.android.wm.shell.bubbles.BubblesNavBarMotionEventHandler.MotionEventListener;
 import com.android.wm.shell.bubbles.animation.AnimatableScaleMatrix;
 import com.android.wm.shell.bubbles.animation.ExpandedAnimationController;
+import com.android.wm.shell.bubbles.animation.ExpandedViewAnimationController;
+import com.android.wm.shell.bubbles.animation.ExpandedViewAnimationControllerImpl;
+import com.android.wm.shell.bubbles.animation.ExpandedViewAnimationControllerStub;
 import com.android.wm.shell.bubbles.animation.PhysicsAnimationLayout;
 import com.android.wm.shell.bubbles.animation.StackAnimationController;
 import com.android.wm.shell.common.FloatingContentCoordinator;
@@ -97,6 +103,12 @@ import java.util.stream.Collectors;
  */
 public class BubbleStackView extends FrameLayout
         implements ViewTreeObserver.OnComputeInternalInsetsListener {
+    /**
+     * Set to {@code true} to enable home gesture handling in bubbles
+     */
+    public static final boolean HOME_GESTURE_ENABLED =
+            SystemProperties.getBoolean("persist.wm.debug.bubbles_home_gesture", false);
+
     private static final String TAG = TAG_WITH_CLASS_NAME ? "BubbleStackView" : TAG_BUBBLES;
 
     /** How far the flyout needs to be dragged before it's dismissed regardless of velocity. */
@@ -148,7 +160,7 @@ public class BubbleStackView extends FrameLayout
      * Handler to use for all delayed animations - this way, we can easily cancel them before
      * starting a new animation.
      */
-    private final ShellExecutor mDelayedAnimationExecutor;
+    private final ShellExecutor mMainExecutor;
     private Runnable mDelayedAnimation;
 
     /**
@@ -197,6 +209,7 @@ public class BubbleStackView extends FrameLayout
     private PhysicsAnimationLayout mBubbleContainer;
     private StackAnimationController mStackAnimationController;
     private ExpandedAnimationController mExpandedAnimationController;
+    private ExpandedViewAnimationController mExpandedViewAnimationController;
 
     private View mScrim;
     private View mManageMenuScrim;
@@ -276,6 +289,9 @@ public class BubbleStackView extends FrameLayout
      */
     private int mPointerIndexDown = -1;
 
+    @Nullable
+    private BubblesNavBarGestureTracker mBubblesNavBarGestureTracker;
+
     /** Description of current animation controller state. */
     public void dump(PrintWriter pw, String[] args) {
         pw.println("Stack view state:");
@@ -693,6 +709,67 @@ public class BubbleStackView extends FrameLayout
         }
     };
 
+    /** Touch listener set on the whole view that forwards event to the swipe up listener. */
+    private final RelativeTouchListener mContainerSwipeListener = new RelativeTouchListener() {
+        @Override
+        public boolean onDown(@NonNull View v, @NonNull MotionEvent ev) {
+            // Pass move event on to swipe listener
+            mSwipeUpListener.onDown(ev.getX(), ev.getY());
+            return true;
+        }
+
+        @Override
+        public void onMove(@NonNull View v, @NonNull MotionEvent ev, float viewInitialX,
+                float viewInitialY, float dx, float dy) {
+            // Pass move event on to swipe listener
+            mSwipeUpListener.onMove(dx, dy);
+        }
+
+        @Override
+        public void onUp(@NonNull View v, @NonNull MotionEvent ev, float viewInitialX,
+                float viewInitialY, float dx, float dy, float velX, float velY) {
+            // Pass up even on to swipe listener
+            mSwipeUpListener.onUp(velX, velY);
+        }
+    };
+
+    /** MotionEventListener that listens from home gesture swipe event. */
+    private final MotionEventListener mSwipeUpListener = new MotionEventListener() {
+        @Override
+        public void onDown(float x, float y) {}
+
+        @Override
+        public void onMove(float dx, float dy) {
+            if ((mManageEduView != null && mManageEduView.getVisibility() == VISIBLE)
+                    || isStackEduShowing()) {
+                return;
+            }
+
+            if (mShowingManage) {
+                showManageMenu(false /* show */);
+            }
+            // Only allow up
+            float collapsed = Math.min(dy, 0);
+            mExpandedViewAnimationController.updateDrag((int) -collapsed);
+        }
+
+        @Override
+        public void onCancel() {
+            mExpandedViewAnimationController.animateBackToExpanded();
+        }
+
+        @Override
+        public void onUp(float velX, float velY) {
+            mExpandedViewAnimationController.setSwipeVelocity(velY);
+            if (mExpandedViewAnimationController.shouldCollapse()) {
+                // Update data first and start the animation when we are processing change
+                mBubbleData.setExpanded(false);
+            } else {
+                mExpandedViewAnimationController.animateBackToExpanded();
+            }
+        }
+    };
+
     /** Click listener set on the flyout, which expands the stack when the flyout is tapped. */
     private OnClickListener mFlyoutClickListener = new OnClickListener() {
         @Override
@@ -766,7 +843,7 @@ public class BubbleStackView extends FrameLayout
             ShellExecutor mainExecutor) {
         super(context);
 
-        mDelayedAnimationExecutor = mainExecutor;
+        mMainExecutor = mainExecutor;
         mBubbleController = bubbleController;
         mBubbleData = data;
 
@@ -796,6 +873,14 @@ public class BubbleStackView extends FrameLayout
 
         mExpandedAnimationController = new ExpandedAnimationController(mPositioner,
                 onBubbleAnimatedOut, this);
+
+        if (HOME_GESTURE_ENABLED) {
+            mExpandedViewAnimationController =
+                    new ExpandedViewAnimationControllerImpl(context, mPositioner);
+        } else {
+            mExpandedViewAnimationController = new ExpandedViewAnimationControllerStub();
+        }
+
         mSurfaceSynchronizer = synchronizer != null ? synchronizer : DEFAULT_SURFACE_SYNCHRONIZER;
 
         // Force LTR by default since most of the Bubbles UI is positioned manually by the user, or
@@ -971,7 +1056,7 @@ public class BubbleStackView extends FrameLayout
                 if (mExpandedBubble != null && mExpandedBubble.getExpandedView() != null) {
                     // We need to be Z ordered on top in order for alpha animations to work.
                     mExpandedBubble.getExpandedView().setSurfaceZOrderedOnTop(true);
-                    mExpandedBubble.getExpandedView().setAlphaAnimating(true);
+                    mExpandedBubble.getExpandedView().setAnimating(true);
                 }
             }
 
@@ -985,14 +1070,15 @@ public class BubbleStackView extends FrameLayout
                         // = 0f remains in effect.
                         && !mExpandedViewTemporarilyHidden) {
                     mExpandedBubble.getExpandedView().setSurfaceZOrderedOnTop(false);
-                    mExpandedBubble.getExpandedView().setAlphaAnimating(false);
+                    mExpandedBubble.getExpandedView().setAnimating(false);
                 }
             }
         });
         mExpandedViewAlphaAnimator.addUpdateListener(valueAnimator -> {
             if (mExpandedBubble != null && mExpandedBubble.getExpandedView() != null) {
-                mExpandedBubble.getExpandedView().setTaskViewAlpha(
+                float alpha = (float) valueAnimator.getAnimatedValue();
-                        (float) valueAnimator.getAnimatedValue());
+                mExpandedBubble.getExpandedView().setContentAlpha(alpha);
+                mExpandedBubble.getExpandedView().setAlpha(alpha);
             }
         });
 
@@ -1795,6 +1881,7 @@ public class BubbleStackView extends FrameLayout
     private void showNewlySelectedBubble(BubbleViewProvider bubbleToSelect) {
         final BubbleViewProvider previouslySelected = mExpandedBubble;
         mExpandedBubble = bubbleToSelect;
+        mExpandedViewAnimationController.setExpandedView(mExpandedBubble.getExpandedView());
 
         if (mIsExpanded) {
             hideCurrentInputMethod();
@@ -1848,7 +1935,12 @@ public class BubbleStackView extends FrameLayout
         mBubbleController.getSysuiProxy().onStackExpandChanged(shouldExpand);
 
         if (mIsExpanded) {
+            stopMonitoringSwipeUpGesture();
+            if (HOME_GESTURE_ENABLED) {
                 animateCollapse();
+            } else {
+                animateCollapseWithScale();
+            }
             logBubbleEvent(mExpandedBubble, FrameworkStatsLog.BUBBLE_UICHANGED__ACTION__COLLAPSED);
         } else {
             animateExpansion();
@@ -1856,10 +1948,37 @@ public class BubbleStackView extends FrameLayout
             logBubbleEvent(mExpandedBubble, FrameworkStatsLog.BUBBLE_UICHANGED__ACTION__EXPANDED);
             logBubbleEvent(mExpandedBubble,
                     FrameworkStatsLog.BUBBLE_UICHANGED__ACTION__STACK_EXPANDED);
+            if (HOME_GESTURE_ENABLED) {
+                startMonitoringSwipeUpGesture();
+            }
         }
         notifyExpansionChanged(mExpandedBubble, mIsExpanded);
     }
 
+    private void startMonitoringSwipeUpGesture() {
+        stopMonitoringSwipeUpGesture();
+
+        if (isGestureNavEnabled()) {
+            mBubblesNavBarGestureTracker = new BubblesNavBarGestureTracker(mContext, mPositioner);
+            mBubblesNavBarGestureTracker.start(mSwipeUpListener);
+            setOnTouchListener(mContainerSwipeListener);
+        }
+    }
+
+    private boolean isGestureNavEnabled() {
+        return mContext.getResources().getInteger(
+                com.android.internal.R.integer.config_navBarInteractionMode)
+                == WindowManagerPolicyConstants.NAV_BAR_MODE_GESTURAL;
+    }
+
+    private void stopMonitoringSwipeUpGesture() {
+        if (mBubblesNavBarGestureTracker != null) {
+            mBubblesNavBarGestureTracker.stop();
+            mBubblesNavBarGestureTracker = null;
+            setOnTouchListener(null);
+        }
+    }
+
     /**
      * Called when back press occurs while bubbles are expanded.
      */
@@ -2072,11 +2191,12 @@ public class BubbleStackView extends FrameLayout
         mExpandedViewContainer.setAnimationMatrix(mExpandedViewContainerMatrix);
 
         if (mExpandedBubble.getExpandedView() != null) {
-            mExpandedBubble.getExpandedView().setTaskViewAlpha(0f);
+            mExpandedBubble.getExpandedView().setContentAlpha(0f);
+            mExpandedBubble.getExpandedView().setAlpha(0f);
 
             // We'll be starting the alpha animation after a slight delay, so set this flag early
             // here.
-            mExpandedBubble.getExpandedView().setAlphaAnimating(true);
+            mExpandedBubble.getExpandedView().setAnimating(true);
         }
 
         mDelayedAnimation = () -> {
@@ -2114,10 +2234,10 @@ public class BubbleStackView extends FrameLayout
                     })
                     .start();
         };
-        mDelayedAnimationExecutor.executeDelayed(mDelayedAnimation, startDelay);
+        mMainExecutor.executeDelayed(mDelayedAnimation, startDelay);
     }
 
-    private void animateCollapse() {
+    private void animateCollapseWithScale() {
         cancelDelayedExpandCollapseSwitchAnimations();
 
         if (mManageEduView != null && mManageEduView.getVisibility() == VISIBLE) {
@@ -2217,6 +2337,68 @@ public class BubbleStackView extends FrameLayout
                 .start();
     }
 
+    private void animateCollapse() {
+        cancelDelayedExpandCollapseSwitchAnimations();
+
+        if (mManageEduView != null && mManageEduView.getVisibility() == VISIBLE) {
+            mManageEduView.hide();
+        }
+
+        mIsExpanded = false;
+        mIsExpansionAnimating = true;
+
+        showScrim(false);
+
+        mBubbleContainer.cancelAllAnimations();
+
+        // If we were in the middle of swapping, the animating-out surface would have been scaling
+        // to zero - finish it off.
+        PhysicsAnimator.getInstance(mAnimatingOutSurfaceContainer).cancel();
+        mAnimatingOutSurfaceContainer.setScaleX(0f);
+        mAnimatingOutSurfaceContainer.setScaleY(0f);
+
+        // Let the expanded animation controller know that it shouldn't animate child adds/reorders
+        // since we're about to animate collapsed.
+        mExpandedAnimationController.notifyPreparingToCollapse();
+
+        final Runnable collapseBackToStack = () -> mExpandedAnimationController.collapseBackToStack(
+                mStackAnimationController
+                        .getStackPositionAlongNearestHorizontalEdge()
+                /* collapseTo */,
+                () -> mBubbleContainer.setActiveController(mStackAnimationController));
+
+        final Runnable after = () -> {
+            final BubbleViewProvider previouslySelected = mExpandedBubble;
+            // TODO(b/231350255): investigate why this call is needed here
+            beforeExpandedViewAnimation();
+            if (mManageEduView != null) {
+                mManageEduView.hide();
+            }
+
+            if (DEBUG_BUBBLE_STACK_VIEW) {
+                Log.d(TAG, "animateCollapse");
+                Log.d(TAG, BubbleDebugConfig.formatBubblesString(getBubblesOnScreen(),
+                        mExpandedBubble));
+            }
+            updateOverflowVisibility();
+            updateZOrder();
+            updateBadges(true /* setBadgeForCollapsedStack */);
+            afterExpandedViewAnimation();
+            if (previouslySelected != null) {
+                previouslySelected.setTaskViewVisibility(false);
+            }
+            mExpandedViewAnimationController.reset();
+        };
+        mExpandedViewAnimationController.animateCollapse(collapseBackToStack, after);
+        if (mExpandedBubble != null && mExpandedBubble.getExpandedView() != null) {
+            // When the animation completes, we should no longer be showing the content.
+            // This won't actually update content visibility immediately, if we are currently
+            // animating. But updates the internal state for the content to be hidden after
+            // animation completes.
+            mExpandedBubble.getExpandedView().setContentVisibility(false);
+        }
+    }
+
     private void animateSwitchBubbles() {
         // If we're no longer expanded, this is meaningless.
         if (!mIsExpanded) {
@@ -2278,7 +2460,7 @@ public class BubbleStackView extends FrameLayout
 
         mExpandedViewContainer.setAnimationMatrix(mExpandedViewContainerMatrix);
 
-        mDelayedAnimationExecutor.executeDelayed(() -> {
+        mMainExecutor.executeDelayed(() -> {
             if (!mIsExpanded) {
                 mIsBubbleSwitchAnimating = false;
                 return;
@@ -2309,7 +2491,7 @@ public class BubbleStackView extends FrameLayout
      * animating flags for those animations.
      */
     private void cancelDelayedExpandCollapseSwitchAnimations() {
-        mDelayedAnimationExecutor.removeCallbacks(mDelayedAnimation);
+        mMainExecutor.removeCallbacks(mDelayedAnimation);
 
         mIsExpansionAnimating = false;
         mIsBubbleSwitchAnimating = false;
@@ -2333,9 +2515,18 @@ public class BubbleStackView extends FrameLayout
     /**
      * Updates the stack based for IME changes. When collapsed it'll move the stack if it
      * overlaps where they IME would be. When expanded it'll shift the expanded bubbles
-     * if they might overlap with the IME (this only happens for large screens).
+     * if they might overlap with the IME (this only happens for large screens)
+     * and clip the expanded view.
      */
-    public void animateForIme(boolean visible) {
+    public void setImeVisible(boolean visible) {
+        if (HOME_GESTURE_ENABLED) {
+            setImeVisibleInternal(visible);
+        } else {
+            setImeVisibleWithoutClipping(visible);
+        }
+    }
+
+    private void setImeVisibleWithoutClipping(boolean visible) {
         if ((mIsExpansionAnimating || mIsBubbleSwitchAnimating) && mIsExpanded) {
             // This will update the animation so the bubbles move to position for the IME
             mExpandedAnimationController.expandFromStack(() -> {
@@ -2386,6 +2577,62 @@ public class BubbleStackView extends FrameLayout
         }
     }
 
+    private void setImeVisibleInternal(boolean visible) {
+        if ((mIsExpansionAnimating || mIsBubbleSwitchAnimating) && mIsExpanded) {
+            // This will update the animation so the bubbles move to position for the IME
+            mExpandedAnimationController.expandFromStack(() -> {
+                updatePointerPosition(false /* forIme */);
+                afterExpandedViewAnimation();
+                mExpandedViewAnimationController.animateForImeVisibilityChange(visible);
+            } /* after */);
+            return;
+        }
+
+        if (!mIsExpanded && getBubbleCount() > 0) {
+            final float stackDestinationY =
+                    mStackAnimationController.animateForImeVisibility(visible);
+
+            // How far the stack is animating due to IME, we'll just animate the flyout by that
+            // much too.
+            final float stackDy =
+                    stackDestinationY - mStackAnimationController.getStackPosition().y;
+
+            // If the flyout is visible, translate it along with the bubble stack.
+            if (mFlyout.getVisibility() == VISIBLE) {
+                PhysicsAnimator.getInstance(mFlyout)
+                        .spring(DynamicAnimation.TRANSLATION_Y,
+                                mFlyout.getTranslationY() + stackDy,
+                                FLYOUT_IME_ANIMATION_SPRING_CONFIG)
+                        .start();
+            }
+        }
+
+        if (mIsExpanded) {
+            mExpandedViewAnimationController.animateForImeVisibilityChange(visible);
+            if (mPositioner.showBubblesVertically()
+                    && mExpandedBubble != null && mExpandedBubble.getExpandedView() != null) {
+                float selectedY = mPositioner.getExpandedBubbleXY(getState().selectedIndex,
+                        getState()).y;
+                float newExpandedViewTop = mPositioner.getExpandedViewY(mExpandedBubble, selectedY);
+                mExpandedBubble.getExpandedView().setImeVisible(visible);
+                if (!mExpandedBubble.getExpandedView().isUsingMaxHeight()) {
+                    mExpandedViewContainer.animate().translationY(newExpandedViewTop);
+                }
+                List<Animator> animList = new ArrayList();
+                for (int i = 0; i < mBubbleContainer.getChildCount(); i++) {
+                    View child = mBubbleContainer.getChildAt(i);
+                    float transY = mPositioner.getExpandedBubbleXY(i, getState()).y;
+                    ObjectAnimator anim = ObjectAnimator.ofFloat(child, TRANSLATION_Y, transY);
+                    animList.add(anim);
+                }
+                updatePointerPosition(true /* forIme */);
+                AnimatorSet set = new AnimatorSet();
+                set.playTogether(animList);
+                set.start();
+            }
+        }
+    }
+
     @Override
     public boolean dispatchTouchEvent(MotionEvent ev) {
         if (ev.getAction() != MotionEvent.ACTION_DOWN && ev.getActionIndex() != mPointerIndexDown) {
@@ -2821,7 +3068,7 @@ public class BubbleStackView extends FrameLayout
                 && mExpandedBubble.getExpandedView() != null) {
             BubbleExpandedView bev = mExpandedBubble.getExpandedView();
             bev.setContentVisibility(false);
-            bev.setAlphaAnimating(!mIsExpansionAnimating);
+            bev.setAnimating(!mIsExpansionAnimating);
             mExpandedViewContainerMatrix.setScaleX(0f);
             mExpandedViewContainerMatrix.setScaleY(0f);
             mExpandedViewContainerMatrix.setTranslate(0f, 0f);

libs/WindowManager/Shell/src/com/android/wm/shell/bubbles/BubblesNavBarGestureTracker.java

@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2022 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.wm.shell.bubbles;
+
+import static com.android.wm.shell.bubbles.BubbleDebugConfig.TAG_BUBBLES;
+import static com.android.wm.shell.bubbles.BubbleDebugConfig.TAG_WITH_CLASS_NAME;
+
+import android.content.Context;
+import android.hardware.input.InputManager;
+import android.util.Log;
+import android.view.Choreographer;
+import android.view.InputChannel;
+import android.view.InputEventReceiver;
+import android.view.InputMonitor;
+
+import androidx.annotation.Nullable;
+
+import com.android.wm.shell.bubbles.BubblesNavBarMotionEventHandler.MotionEventListener;
+
+/**
+ * Set up tracking bubbles gestures that begin in navigation bar
+ */
+class BubblesNavBarGestureTracker {
+
+    private static final String TAG = TAG_WITH_CLASS_NAME ? "BubblesGestureTracker" : TAG_BUBBLES;
+
+    private static final String GESTURE_MONITOR = "bubbles-gesture";
+    private final Context mContext;
+    private final BubblePositioner mPositioner;
+
+    @Nullable
+    private InputMonitor mInputMonitor;
+    @Nullable
+    private InputEventReceiver mInputEventReceiver;
+
+    BubblesNavBarGestureTracker(Context context, BubblePositioner positioner) {
+        mContext = context;
+        mPositioner = positioner;
+    }
+
+    /**
+     * Start tracking gestures
+     *
+     * @param listener listener that is notified of touch events
+     */
+    void start(MotionEventListener listener) {
+        if (BubbleDebugConfig.DEBUG_BUBBLE_GESTURE) {
+            Log.d(TAG, "start monitoring bubbles swipe up gesture");
+        }
+
+        stopInternal();
+
+        mInputMonitor = InputManager.getInstance().monitorGestureInput(GESTURE_MONITOR,
+                mContext.getDisplayId());
+        InputChannel inputChannel = mInputMonitor.getInputChannel();
+
+        BubblesNavBarMotionEventHandler motionEventHandler =
+                new BubblesNavBarMotionEventHandler(mContext, mPositioner,
+                        this::onInterceptTouch, listener);
+        mInputEventReceiver = new BubblesNavBarInputEventReceiver(inputChannel,
+                Choreographer.getInstance(), motionEventHandler);
+    }
+
+    void stop() {
+        if (BubbleDebugConfig.DEBUG_BUBBLE_GESTURE) {
+            Log.d(TAG, "stop monitoring bubbles swipe up gesture");
+        }
+        stopInternal();
+    }
+
+    private void stopInternal() {
+        if (mInputEventReceiver != null) {
+            mInputEventReceiver.dispose();
+            mInputEventReceiver = null;
+        }
+        if (mInputMonitor != null) {
+            mInputMonitor.dispose();
+            mInputMonitor = null;
+        }
+    }
+
+    private void onInterceptTouch() {
+        if (BubbleDebugConfig.DEBUG_BUBBLE_GESTURE) {
+            Log.d(TAG, "intercept touch event");
+        }
+        if (mInputMonitor != null) {
+            mInputMonitor.pilferPointers();
+        }
+    }
+}

libs/WindowManager/Shell/src/com/android/wm/shell/bubbles/BubblesNavBarInputEventReceiver.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2022 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.wm.shell.bubbles;
+
+import android.os.Looper;
+import android.view.BatchedInputEventReceiver;
+import android.view.Choreographer;
+import android.view.InputChannel;
+import android.view.InputEvent;
+import android.view.MotionEvent;
+
+/**
+ * Bubbles {@link BatchedInputEventReceiver} for monitoring touches from navbar gesture area
+ */
+class BubblesNavBarInputEventReceiver extends BatchedInputEventReceiver {
+
+    private final BubblesNavBarMotionEventHandler mMotionEventHandler;
+
+    BubblesNavBarInputEventReceiver(InputChannel inputChannel,
+            Choreographer choreographer, BubblesNavBarMotionEventHandler motionEventHandler) {
+        super(inputChannel, Looper.myLooper(), choreographer);
+        mMotionEventHandler = motionEventHandler;
+    }
+
+    @Override
+    public void onInputEvent(InputEvent event) {
+        boolean handled = false;
+        try {
+            if (!(event instanceof MotionEvent)) {
+                return;
+            }
+            handled = mMotionEventHandler.onMotionEvent((MotionEvent) event);
+        } finally {
+            finishInputEvent(event, handled);
+        }
+    }
+}

libs/WindowManager/Shell/src/com/android/wm/shell/bubbles/BubblesNavBarMotionEventHandler.java

@@ -0,0 +1,175 @@
+/*
+ * Copyright (C) 2022 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.wm.shell.bubbles;
+
+import static com.android.wm.shell.bubbles.BubbleDebugConfig.DEBUG_BUBBLE_GESTURE;
+import static com.android.wm.shell.bubbles.BubbleDebugConfig.TAG_BUBBLES;
+import static com.android.wm.shell.bubbles.BubbleDebugConfig.TAG_WITH_CLASS_NAME;
+
+import android.content.Context;
+import android.graphics.PointF;
+import android.util.Log;
+import android.view.MotionEvent;
+import android.view.VelocityTracker;
+import android.view.ViewConfiguration;
+
+import androidx.annotation.Nullable;
+
+/**
+ * Handles {@link MotionEvent}s for bubbles that begin in the nav bar area
+ */
+class BubblesNavBarMotionEventHandler {
+    private static final String TAG =
+            TAG_WITH_CLASS_NAME ? "BubblesNavBarMotionEventHandler" : TAG_BUBBLES;
+    private static final int VELOCITY_UNITS = 1000;
+
+    private final Runnable mOnInterceptTouch;
+    private final MotionEventListener mMotionEventListener;
+    private final int mTouchSlop;
+    private final BubblePositioner mPositioner;
+    private final PointF mTouchDown = new PointF();
+    private boolean mTrackingTouches;
+    private boolean mInterceptingTouches;
+    @Nullable
+    private VelocityTracker mVelocityTracker;
+
+    BubblesNavBarMotionEventHandler(Context context, BubblePositioner positioner,
+            Runnable onInterceptTouch, MotionEventListener motionEventListener) {
+        mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
+        mPositioner = positioner;
+        mOnInterceptTouch = onInterceptTouch;
+        mMotionEventListener = motionEventListener;
+    }
+
+    /**
+     * Handle {@link MotionEvent} and forward it to {@code motionEventListener} defined in
+     * constructor
+     *
+     * @return {@code true} if this {@link MotionEvent} is handled (it started in the gesture area)
+     */
+    public boolean onMotionEvent(MotionEvent motionEvent) {
+        float dx = motionEvent.getX() - mTouchDown.x;
+        float dy = motionEvent.getY() - mTouchDown.y;
+
+        switch (motionEvent.getAction()) {
+            case MotionEvent.ACTION_DOWN:
+                if (isInGestureRegion(motionEvent)) {
+                    mTouchDown.set(motionEvent.getX(), motionEvent.getY());
+                    mMotionEventListener.onDown(motionEvent.getX(), motionEvent.getY());
+                    mTrackingTouches = true;
+                    return true;
+                }
+                break;
+            case MotionEvent.ACTION_MOVE:
+                if (mTrackingTouches) {
+                    if (!mInterceptingTouches && Math.hypot(dx, dy) > mTouchSlop) {
+                        mInterceptingTouches = true;
+                        mOnInterceptTouch.run();
+                    }
+                    if (mInterceptingTouches) {
+                        getVelocityTracker().addMovement(motionEvent);
+                        mMotionEventListener.onMove(dx, dy);
+                    }
+                    return true;
+                }
+                break;
+            case MotionEvent.ACTION_CANCEL:
+                if (mTrackingTouches) {
+                    mMotionEventListener.onCancel();
+                    finishTracking();
+                    return true;
+                }
+                break;
+            case MotionEvent.ACTION_UP:
+                if (mTrackingTouches) {
+                    if (mInterceptingTouches) {
+                        getVelocityTracker().computeCurrentVelocity(VELOCITY_UNITS);
+                        mMotionEventListener.onUp(getVelocityTracker().getXVelocity(),
+                                getVelocityTracker().getYVelocity());
+                    }
+                    finishTracking();
+                    return true;
+                }
+                break;
+        }
+        return false;
+    }
+
+    private boolean isInGestureRegion(MotionEvent ev) {
+        // Only handles touch events beginning in navigation bar system gesture zone
+        if (mPositioner.getNavBarGestureZone().contains((int) ev.getX(), (int) ev.getY())) {
+            if (DEBUG_BUBBLE_GESTURE) {
+                Log.d(TAG, "handling touch y=" + ev.getY()
+                        + " navBarGestureZone=" + mPositioner.getNavBarGestureZone());
+            }
+            return true;
+        }
+        return false;
+    }
+
+    private VelocityTracker getVelocityTracker() {
+        if (mVelocityTracker == null) {
+            mVelocityTracker = VelocityTracker.obtain();
+        }
+        return mVelocityTracker;
+    }
+
+    private void finishTracking() {
+        mTouchDown.set(0, 0);
+        mTrackingTouches = false;
+        mInterceptingTouches = false;
+        if (mVelocityTracker != null) {
+            mVelocityTracker.recycle();
+            mVelocityTracker = null;
+        }
+    }
+
+    /**
+     * Callback for receiving {@link MotionEvent} updates
+     */
+    interface MotionEventListener {
+        /**
+         * Touch down action.
+         *
+         * @param x x coordinate
+         * @param y y coordinate
+         */
+        void onDown(float x, float y);
+
+        /**
+         * Move action.
+         * Reports distance from point reported in {@link #onDown(float, float)}
+         *
+         * @param dx distance moved on x-axis from starting point, in pixels
+         * @param dy distance moved on y-axis from starting point, in pixels
+         */
+        void onMove(float dx, float dy);
+
+        /**
+         * Touch up action.
+         *
+         * @param velX velocity of the move action on x axis
+         * @param velY velocity of the move actin on y axis
+         */
+        void onUp(float velX, float velY);
+
+        /**
+         * Motion action was cancelled.
+         */
+        void onCancel();
+    }
+}

libs/WindowManager/Shell/src/com/android/wm/shell/bubbles/RelativeTouchListener.kt

@@ -17,8 +17,6 @@
 package com.android.wm.shell.bubbles
 
 import android.graphics.PointF
-import android.os.Handler
-import android.os.Looper
 import android.view.MotionEvent
 import android.view.VelocityTracker
 import android.view.View
@@ -146,6 +144,12 @@ abstract class RelativeTouchListener : View.OnTouchListener {
                 velocityTracker.clear()
                 movedEnough = false
             }
+
+            MotionEvent.ACTION_CANCEL -> {
+                v.handler.removeCallbacksAndMessages(null)
+                velocityTracker.clear()
+                movedEnough = false
+            }
         }
 
         return true

libs/WindowManager/Shell/src/com/android/wm/shell/bubbles/animation/ExpandedAnimationController.java

@@ -17,11 +17,13 @@
 package com.android.wm.shell.bubbles.animation;
 
 import static com.android.wm.shell.bubbles.BubblePositioner.NUM_VISIBLE_WHEN_RESTING;
+import static com.android.wm.shell.bubbles.BubbleStackView.HOME_GESTURE_ENABLED;
 
 import android.content.res.Resources;
 import android.graphics.Path;
 import android.graphics.PointF;
 import android.view.View;
+import android.view.animation.Interpolator;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
@@ -61,7 +63,10 @@ public class ExpandedAnimationController
     private static final float DAMPING_RATIO_MEDIUM_LOW_BOUNCY = 0.65f;
 
     /** Stiffness for the expand/collapse path-following animation. */
-    private static final int EXPAND_COLLAPSE_ANIM_STIFFNESS = 1000;
+    private static final int EXPAND_COLLAPSE_ANIM_STIFFNESS = 400;
+
+    /** Stiffness for the expand/collapse animation when home gesture handling is off */
+    private static final int EXPAND_COLLAPSE_ANIM_STIFFNESS_WITHOUT_HOME_GESTURE = 1000;
 
     /**
      * Velocity required to dismiss an individual bubble without dragging it into the dismiss
@@ -73,6 +78,11 @@ public class ExpandedAnimationController
             new PhysicsAnimator.SpringConfig(
                     EXPAND_COLLAPSE_ANIM_STIFFNESS, SpringForce.DAMPING_RATIO_NO_BOUNCY);
 
+    private final PhysicsAnimator.SpringConfig mAnimateOutSpringConfigWithoutHomeGesture =
+            new PhysicsAnimator.SpringConfig(
+                    EXPAND_COLLAPSE_ANIM_STIFFNESS_WITHOUT_HOME_GESTURE,
+                    SpringForce.DAMPING_RATIO_NO_BOUNCY);
+
     /** Horizontal offset between bubbles, which we need to know to re-stack them. */
     private float mStackOffsetPx;
     /** Size of each bubble. */
@@ -278,11 +288,20 @@ public class ExpandedAnimationController
                     (firstBubbleLeads && index == 0)
                             || (!firstBubbleLeads && index == mLayout.getChildCount() - 1);
 
+            Interpolator interpolator;
+            if (HOME_GESTURE_ENABLED) {
+                // When home gesture is enabled, we use a different animation timing for collapse
+                interpolator = expanding
+                        ? Interpolators.EMPHASIZED_ACCELERATE : Interpolators.EMPHASIZED_DECELERATE;
+            } else {
+                interpolator = Interpolators.LINEAR;
+            }
+
             animation
                     .followAnimatedTargetAlongPath(
                             path,
                             EXPAND_COLLAPSE_TARGET_ANIM_DURATION /* targetAnimDuration */,
-                            Interpolators.LINEAR /* targetAnimInterpolator */,
+                            interpolator /* targetAnimInterpolator */,
                             isLeadBubble ? mLeadBubbleEndAction : null /* endAction */,
                             () -> mLeadBubbleEndAction = null /* endAction */)
                     .withStartDelay(startDelay)
@@ -525,10 +544,16 @@ public class ExpandedAnimationController
             finishRemoval.run();
             mOnBubbleAnimatedOutAction.run();
         } else {
+            PhysicsAnimator.SpringConfig springConfig;
+            if (HOME_GESTURE_ENABLED) {
+                springConfig = mAnimateOutSpringConfig;
+            } else {
+                springConfig = mAnimateOutSpringConfigWithoutHomeGesture;
+            }
             PhysicsAnimator.getInstance(child)
                     .spring(DynamicAnimation.ALPHA, 0f)
-                    .spring(DynamicAnimation.SCALE_X, 0f, mAnimateOutSpringConfig)
+                    .spring(DynamicAnimation.SCALE_X, 0f, springConfig)
-                    .spring(DynamicAnimation.SCALE_Y, 0f, mAnimateOutSpringConfig)
+                    .spring(DynamicAnimation.SCALE_Y, 0f, springConfig)
                     .withEndActions(finishRemoval, mOnBubbleAnimatedOutAction)
                     .start();
         }

libs/WindowManager/Shell/src/com/android/wm/shell/bubbles/animation/ExpandedViewAnimationController.java

@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2022 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.wm.shell.bubbles.animation;
+
+import com.android.wm.shell.bubbles.BubbleExpandedView;
+
+/**
+ * Animation controller for bubble expanded view collapsing
+ */
+public interface ExpandedViewAnimationController {
+    /**
+     * Set expanded view that this controller is working with.
+     */
+    void setExpandedView(BubbleExpandedView expandedView);
+
+    /**
+     * Set current collapse value, in pixels.
+     *
+     * @param distance pixels that user dragged the view by
+     */
+    void updateDrag(float distance);
+
+    /**
+     * Set current swipe velocity.
+     * Velocity is directional:
+     * <ul>
+     *     <li>velocity < 0 means swipe direction is up</li>
+     *     <li>velocity > 0 means swipe direction is down</li>
+     * </ul>
+     */
+    void setSwipeVelocity(float velocity);
+
+    /**
+     * Check if view is dragged past collapse threshold or swipe up velocity exceeds min velocity
+     * required to collapse the view
+     */
+    boolean shouldCollapse();
+
+    /**
+     * Animate view to collapsed state
+     *
+     * @param startStackCollapse runnable that is triggered when bubbles can start moving back to
+     *                           their collapsed location
+     * @param after              runnable to run after animation is complete
+     */
+    void animateCollapse(Runnable startStackCollapse, Runnable after);
+
+    /**
+     * Animate the view back to fully expanded state.
+     */
+    void animateBackToExpanded();
+
+    /**
+     * Animate view for IME visibility change
+     */
+    void animateForImeVisibilityChange(boolean visible);
+
+    /**
+     * Reset the view to fully expanded state
+     */
+    void reset();
+}

libs/WindowManager/Shell/src/com/android/wm/shell/bubbles/animation/ExpandedViewAnimationControllerImpl.java

@@ -0,0 +1,432 @@
+/*
+ * Copyright (C) 2022 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.wm.shell.bubbles.animation;
+
+import static android.view.View.ALPHA;
+
+import static com.android.wm.shell.bubbles.BubbleDebugConfig.DEBUG_COLLAPSE_ANIMATOR;
+import static com.android.wm.shell.bubbles.BubbleDebugConfig.DEBUG_EXPANDED_VIEW_DRAGGING;
+import static com.android.wm.shell.bubbles.BubbleDebugConfig.TAG_BUBBLES;
+import static com.android.wm.shell.bubbles.BubbleDebugConfig.TAG_WITH_CLASS_NAME;
+import static com.android.wm.shell.bubbles.BubbleExpandedView.BOTTOM_CLIP_PROPERTY;
+import static com.android.wm.shell.bubbles.BubbleExpandedView.CONTENT_ALPHA;
+import static com.android.wm.shell.bubbles.BubbleExpandedView.MANAGE_BUTTON_ALPHA;
+
+import android.animation.Animator;
+import android.animation.AnimatorListenerAdapter;
+import android.animation.AnimatorSet;
+import android.animation.ObjectAnimator;
+import android.animation.ValueAnimator;
+import android.annotation.SuppressLint;
+import android.content.Context;
+import android.util.Log;
+import android.view.HapticFeedbackConstants;
+import android.view.ViewConfiguration;
+
+import androidx.annotation.Nullable;
+import androidx.dynamicanimation.animation.DynamicAnimation;
+import androidx.dynamicanimation.animation.FloatPropertyCompat;
+import androidx.dynamicanimation.animation.SpringAnimation;
+import androidx.dynamicanimation.animation.SpringForce;
+
+import com.android.wm.shell.animation.FlingAnimationUtils;
+import com.android.wm.shell.animation.Interpolators;
+import com.android.wm.shell.bubbles.BubbleExpandedView;
+import com.android.wm.shell.bubbles.BubblePositioner;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Implementation of {@link ExpandedViewAnimationController} that uses a collapse animation to
+ * hide the {@link BubbleExpandedView}
+ */
+public class ExpandedViewAnimationControllerImpl implements ExpandedViewAnimationController {
+
+    private static final String TAG = TAG_WITH_CLASS_NAME ? "ExpandedViewAnimCtrl" : TAG_BUBBLES;
+
+    private static final float COLLAPSE_THRESHOLD = 0.02f;
+
+    private static final int COLLAPSE_DURATION_MS = 250;
+
+    private static final int MANAGE_BUTTON_ANIM_DURATION_MS = 78;
+
+    private static final int CONTENT_OPACITY_ANIM_DELAY_MS = 93;
+    private static final int CONTENT_OPACITY_ANIM_DURATION_MS = 78;
+
+    private static final int BACKGROUND_OPACITY_ANIM_DELAY_MS = 172;
+    private static final int BACKGROUND_OPACITY_ANIM_DURATION_MS = 78;
+
+    /** Animation fraction threshold for content alpha animation when stack collapse should begin */
+    private static final float STACK_COLLAPSE_THRESHOLD = 0.5f;
+
+    private static final FloatPropertyCompat<ExpandedViewAnimationControllerImpl>
+            COLLAPSE_HEIGHT_PROPERTY =
+            new FloatPropertyCompat<ExpandedViewAnimationControllerImpl>("CollapseSpring") {
+                @Override
+                public float getValue(ExpandedViewAnimationControllerImpl controller) {
+                    return controller.getCollapsedAmount();
+                }
+
+                @Override
+                public void setValue(ExpandedViewAnimationControllerImpl controller,
+                        float value) {
+                    controller.setCollapsedAmount(value);
+                }
+            };
+
+    private final int mMinFlingVelocity;
+    private float mSwipeUpVelocity;
+    private float mSwipeDownVelocity;
+    private final BubblePositioner mPositioner;
+    private final FlingAnimationUtils mFlingAnimationUtils;
+    private int mDraggedAmount;
+    private float mCollapsedAmount;
+    @Nullable
+    private BubbleExpandedView mExpandedView;
+    @Nullable
+    private AnimatorSet mCollapseAnimation;
+    private boolean mNotifiedAboutThreshold;
+    private SpringAnimation mBackToExpandedAnimation;
+    @Nullable
+    private ObjectAnimator mBottomClipAnim;
+
+    public ExpandedViewAnimationControllerImpl(Context context, BubblePositioner positioner) {
+        mFlingAnimationUtils = new FlingAnimationUtils(context.getResources().getDisplayMetrics(),
+                COLLAPSE_DURATION_MS / 1000f);
+        mMinFlingVelocity = ViewConfiguration.get(context).getScaledMinimumFlingVelocity();
+        mPositioner = positioner;
+    }
+
+    private static void adjustAnimatorSetDuration(AnimatorSet animatorSet,
+            float durationAdjustment) {
+        for (Animator animator : animatorSet.getChildAnimations()) {
+            animator.setStartDelay((long) (animator.getStartDelay() * durationAdjustment));
+            animator.setDuration((long) (animator.getDuration() * durationAdjustment));
+        }
+    }
+
+    @Override
+    public void setExpandedView(BubbleExpandedView expandedView) {
+        if (mExpandedView != null) {
+            if (DEBUG_COLLAPSE_ANIMATOR) {
+                Log.d(TAG, "updating expandedView, resetting previous");
+            }
+            if (mCollapseAnimation != null) {
+                mCollapseAnimation.cancel();
+            }
+            if (mBackToExpandedAnimation != null) {
+                mBackToExpandedAnimation.cancel();
+            }
+            reset();
+        }
+        mExpandedView = expandedView;
+    }
+
+    @Override
+    public void updateDrag(float distance) {
+        if (mExpandedView != null) {
+            mDraggedAmount = OverScroll.dampedScroll(distance, mExpandedView.getContentHeight());
+
+            if (DEBUG_COLLAPSE_ANIMATOR && DEBUG_EXPANDED_VIEW_DRAGGING) {
+                Log.d(TAG, "updateDrag: distance=" + distance + " dragged=" + mDraggedAmount);
+            }
+
+            setCollapsedAmount(mDraggedAmount);
+
+            if (!mNotifiedAboutThreshold && isPastCollapseThreshold()) {
+                mNotifiedAboutThreshold = true;
+                if (DEBUG_COLLAPSE_ANIMATOR) {
+                    Log.d(TAG, "notifying over collapse threshold");
+                }
+                vibrateIfEnabled();
+            }
+        }
+    }
+
+    @Override
+    public void setSwipeVelocity(float velocity) {
+        if (velocity < 0) {
+            mSwipeUpVelocity = Math.abs(velocity);
+            mSwipeDownVelocity = 0;
+        } else {
+            mSwipeUpVelocity = 0;
+            mSwipeDownVelocity = velocity;
+        }
+    }
+
+    @Override
+    public boolean shouldCollapse() {
+        if (mSwipeDownVelocity > mMinFlingVelocity) {
+            // Swipe velocity is positive and over fling velocity.
+            // This is a swipe down, always reset to expanded state, regardless of dragged amount.
+            if (DEBUG_COLLAPSE_ANIMATOR) {
+                Log.d(TAG,
+                        "not collapsing expanded view, swipe down velocity: " + mSwipeDownVelocity
+                                + " minV: " + mMinFlingVelocity);
+            }
+            return false;
+        }
+
+        if (mSwipeUpVelocity > mMinFlingVelocity) {
+            // Swiping up and over fling velocity, collapse the view.
+            if (DEBUG_COLLAPSE_ANIMATOR) {
+                Log.d(TAG,
+                        "collapse expanded view, swipe up velocity: " + mSwipeUpVelocity + " minV: "
+                                + mMinFlingVelocity);
+            }
+            return true;
+        }
+
+        if (isPastCollapseThreshold()) {
+            if (DEBUG_COLLAPSE_ANIMATOR) {
+                Log.d(TAG, "collapse expanded view, past threshold, dragged: " + mDraggedAmount);
+            }
+            return true;
+        }
+
+        if (DEBUG_COLLAPSE_ANIMATOR) {
+            Log.d(TAG, "not collapsing expanded view");
+        }
+
+        return false;
+    }
+
+    @Override
+    public void animateCollapse(Runnable startStackCollapse, Runnable after) {
+        if (DEBUG_COLLAPSE_ANIMATOR) {
+            Log.d(TAG,
+                    "expandedView animate collapse swipeVel=" + mSwipeUpVelocity + " minFlingVel="
+                            + mMinFlingVelocity);
+        }
+        if (mExpandedView != null) {
+            // Mark it as animating immediately to avoid updates to the view before animation starts
+            mExpandedView.setAnimating(true);
+
+            if (mCollapseAnimation != null) {
+                mCollapseAnimation.cancel();
+            }
+            mCollapseAnimation = createCollapseAnimation(mExpandedView, startStackCollapse, after);
+
+            if (mSwipeUpVelocity >= mMinFlingVelocity) {
+                int contentHeight = mExpandedView.getContentHeight();
+
+                // Use a temp animator to get adjusted duration value for swipe.
+                // This new value will be used to adjust animation times proportionally in the
+                // animator set. If we adjust animator set duration directly, all child animations
+                // will get the same animation time.
+                ValueAnimator tempAnimator = new ValueAnimator();
+                mFlingAnimationUtils.applyDismissing(tempAnimator, mCollapsedAmount, contentHeight,
+                        mSwipeUpVelocity, (contentHeight - mCollapsedAmount));
+
+                float durationAdjustment =
+                        (float) tempAnimator.getDuration() / COLLAPSE_DURATION_MS;
+
+                adjustAnimatorSetDuration(mCollapseAnimation, durationAdjustment);
+                mCollapseAnimation.setInterpolator(tempAnimator.getInterpolator());
+            }
+            mCollapseAnimation.start();
+        }
+    }
+
+    @Override
+    public void animateBackToExpanded() {
+        if (DEBUG_COLLAPSE_ANIMATOR) {
+            Log.d(TAG, "expandedView animate back to expanded");
+        }
+        BubbleExpandedView expandedView = mExpandedView;
+        if (expandedView == null) {
+            return;
+        }
+
+        expandedView.setAnimating(true);
+
+        mBackToExpandedAnimation = new SpringAnimation(this, COLLAPSE_HEIGHT_PROPERTY);
+        mBackToExpandedAnimation.setSpring(new SpringForce()
+                .setStiffness(SpringForce.STIFFNESS_LOW)
+                .setDampingRatio(SpringForce.DAMPING_RATIO_LOW_BOUNCY)
+        );
+        mBackToExpandedAnimation.addEndListener(new OneTimeEndListener() {
+            @Override
+            public void onAnimationEnd(DynamicAnimation animation, boolean canceled, float value,
+                    float velocity) {
+                super.onAnimationEnd(animation, canceled, value, velocity);
+                mNotifiedAboutThreshold = false;
+                mBackToExpandedAnimation = null;
+                expandedView.setAnimating(false);
+            }
+        });
+        mBackToExpandedAnimation.setStartValue(mCollapsedAmount);
+        mBackToExpandedAnimation.animateToFinalPosition(0);
+    }
+
+    @Override
+    public void animateForImeVisibilityChange(boolean visible) {
+        if (mExpandedView != null) {
+            if (mBottomClipAnim != null) {
+                mBottomClipAnim.cancel();
+            }
+            int clip = 0;
+            if (visible) {
+                // Clip the expanded view at the top of the IME view
+                clip = mExpandedView.getContentBottomOnScreen() - mPositioner.getImeTop();
+                // Don't allow negative clip value
+                clip = Math.max(clip, 0);
+            }
+            mBottomClipAnim = ObjectAnimator.ofInt(mExpandedView, BOTTOM_CLIP_PROPERTY, clip);
+            mBottomClipAnim.addListener(new AnimatorListenerAdapter() {
+                @Override
+                public void onAnimationEnd(Animator animation) {
+                    mBottomClipAnim = null;
+                }
+            });
+            mBottomClipAnim.start();
+        }
+    }
+
+    @Override
+    public void reset() {
+        if (DEBUG_COLLAPSE_ANIMATOR) {
+            Log.d(TAG, "reset expandedView collapsed state");
+        }
+        if (mExpandedView == null) {
+            return;
+        }
+        mExpandedView.setAnimating(false);
+
+        if (mCollapseAnimation != null) {
+            mCollapseAnimation.cancel();
+        }
+        if (mBackToExpandedAnimation != null) {
+            mBackToExpandedAnimation.cancel();
+        }
+        mExpandedView.setContentAlpha(1);
+        mExpandedView.setAlpha(1);
+        mExpandedView.setManageButtonAlpha(1);
+        setCollapsedAmount(0);
+        mExpandedView.setBottomClip(0);
+        mExpandedView.movePointerBy(0, 0);
+        mCollapsedAmount = 0;
+        mDraggedAmount = 0;
+        mSwipeUpVelocity = 0;
+        mSwipeDownVelocity = 0;
+        mNotifiedAboutThreshold = false;
+    }
+
+    private float getCollapsedAmount() {
+        return mCollapsedAmount;
+    }
+
+    private void setCollapsedAmount(float collapsed) {
+        if (mCollapsedAmount != collapsed) {
+            float previous = mCollapsedAmount;
+            mCollapsedAmount = collapsed;
+
+            if (mExpandedView != null) {
+                if (previous == 0) {
+                    // View was not collapsed before. Apply z order change
+                    mExpandedView.setSurfaceZOrderedOnTop(true);
+                    mExpandedView.setAnimating(true);
+                }
+
+                mExpandedView.setTopClip((int) mCollapsedAmount);
+                // Move up with translationY. Use negative collapsed value
+                mExpandedView.setContentTranslationY(-mCollapsedAmount);
+                mExpandedView.setManageButtonTranslationY(-mCollapsedAmount);
+
+                if (mCollapsedAmount == 0) {
+                    // View is no longer collapsed. Revert z order change
+                    mExpandedView.setSurfaceZOrderedOnTop(false);
+                    mExpandedView.setAnimating(false);
+                }
+            }
+        }
+    }
+
+    private boolean isPastCollapseThreshold() {
+        if (mExpandedView != null) {
+            return mDraggedAmount > mExpandedView.getContentHeight() * COLLAPSE_THRESHOLD;
+        }
+        return false;
+    }
+
+    private AnimatorSet createCollapseAnimation(BubbleExpandedView expandedView,
+            Runnable startStackCollapse, Runnable after) {
+        List<Animator> animatorList = new ArrayList<>();
+        animatorList.add(createHeightAnimation(expandedView));
+        animatorList.add(createManageButtonAnimation());
+        ObjectAnimator contentAlphaAnimation = createContentAlphaAnimation();
+        final boolean[] notified = {false};
+        contentAlphaAnimation.addUpdateListener(animation -> {
+            if (!notified[0] && animation.getAnimatedFraction() > STACK_COLLAPSE_THRESHOLD) {
+                notified[0] = true;
+                // Notify bubbles that they can start moving back to the collapsed position
+                startStackCollapse.run();
+            }
+        });
+        animatorList.add(contentAlphaAnimation);
+        animatorList.add(createBackgroundAlphaAnimation());
+
+        AnimatorSet animatorSet = new AnimatorSet();
+        animatorSet.addListener(new AnimatorListenerAdapter() {
+            @Override
+            public void onAnimationEnd(Animator animation) {
+                after.run();
+            }
+        });
+        animatorSet.playTogether(animatorList);
+        return animatorSet;
+    }
+
+    private ValueAnimator createHeightAnimation(BubbleExpandedView expandedView) {
+        ValueAnimator animator = ValueAnimator.ofInt((int) mCollapsedAmount,
+                expandedView.getContentHeight());
+        animator.setInterpolator(Interpolators.EMPHASIZED_ACCELERATE);
+        animator.setDuration(COLLAPSE_DURATION_MS);
+        animator.addUpdateListener(anim -> setCollapsedAmount((int) anim.getAnimatedValue()));
+        return animator;
+    }
+
+    private ObjectAnimator createManageButtonAnimation() {
+        ObjectAnimator animator = ObjectAnimator.ofFloat(mExpandedView, MANAGE_BUTTON_ALPHA, 0f);
+        animator.setDuration(MANAGE_BUTTON_ANIM_DURATION_MS);
+        animator.setInterpolator(Interpolators.LINEAR);
+        return animator;
+    }
+
+    private ObjectAnimator createContentAlphaAnimation() {
+        ObjectAnimator animator = ObjectAnimator.ofFloat(mExpandedView, CONTENT_ALPHA, 0f);
+        animator.setDuration(CONTENT_OPACITY_ANIM_DURATION_MS);
+        animator.setInterpolator(Interpolators.LINEAR);
+        animator.setStartDelay(CONTENT_OPACITY_ANIM_DELAY_MS);
+        return animator;
+    }
+
+    private ObjectAnimator createBackgroundAlphaAnimation() {
+        ObjectAnimator animator = ObjectAnimator.ofFloat(mExpandedView, ALPHA, 0f);
+        animator.setDuration(BACKGROUND_OPACITY_ANIM_DURATION_MS);
+        animator.setInterpolator(Interpolators.LINEAR);
+        animator.setStartDelay(BACKGROUND_OPACITY_ANIM_DELAY_MS);
+        return animator;
+    }
+
+    @SuppressLint("MissingPermission")
+    private void vibrateIfEnabled() {
+        if (mExpandedView != null) {
+            mExpandedView.performHapticFeedback(HapticFeedbackConstants.DRAG_CROSSING);
+        }
+    }
+}

libs/WindowManager/Shell/src/com/android/wm/shell/bubbles/animation/ExpandedViewAnimationControllerStub.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2022 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.wm.shell.bubbles.animation;
+
+import com.android.wm.shell.bubbles.BubbleExpandedView;
+
+/**
+ * Stub implementation {@link ExpandedViewAnimationController} that does not animate the
+ * {@link BubbleExpandedView}
+ */
+public class ExpandedViewAnimationControllerStub implements ExpandedViewAnimationController {
+    @Override
+    public void setExpandedView(BubbleExpandedView expandedView) {
+    }
+
+    @Override
+    public void updateDrag(float distance) {
+    }
+
+    @Override
+    public void setSwipeVelocity(float velocity) {
+    }
+
+    @Override
+    public boolean shouldCollapse() {
+        return false;
+    }
+
+    @Override
+    public void animateCollapse(Runnable startStackCollapse, Runnable after) {
+    }
+
+    @Override
+    public void animateBackToExpanded() {
+    }
+
+    @Override
+    public void animateForImeVisibilityChange(boolean visible) {
+    }
+
+    @Override
+    public void reset() {
+    }
+}

libs/WindowManager/Shell/src/com/android/wm/shell/bubbles/animation/OverScroll.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2022 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.wm.shell.bubbles.animation;
+
+/**
+ * Utility methods for overscroll damping and related effect.
+ *
+ * Copied from packages/apps/Launcher3/src/com/android/launcher3/touch/OverScroll.java
+ */
+public class OverScroll {
+
+    private static final float OVERSCROLL_DAMP_FACTOR = 0.07f;
+
+    /**
+     * This curve determines how the effect of scrolling over the limits of the page diminishes
+     * as the user pulls further and further from the bounds
+     *
+     * @param f The percentage of how much the user has overscrolled.
+     * @return A transformed percentage based on the influence curve.
+     */
+    private static float overScrollInfluenceCurve(float f) {
+        f -= 1.0f;
+        return f * f * f + 1.0f;
+    }
+
+    /**
+     * @param amount The original amount overscrolled.
+     * @param max The maximum amount that the View can overscroll.
+     * @return The dampened overscroll amount.
+     */
+    public static int dampedScroll(float amount, int max) {
+        if (Float.compare(amount, 0) == 0) return 0;
+
+        float f = amount / max;
+        f = f / (Math.abs(f)) * (overScrollInfluenceCurve(Math.abs(f)));
+
+        // Clamp this factor, f, to -1 < f < 1
+        if (Math.abs(f) >= 1) {
+            f /= Math.abs(f);
+        }
+
+        return Math.round(OVERSCROLL_DAMP_FACTOR * f * max);
+    }
+}

libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/bubbles/BubblesNavBarMotionEventHandlerTest.java

@@ -0,0 +1,142 @@
+/*
+ * Copyright (C) 2022 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.wm.shell.bubbles;
+
+import static android.view.MotionEvent.ACTION_CANCEL;
+import static android.view.MotionEvent.ACTION_DOWN;
+import static android.view.MotionEvent.ACTION_MOVE;
+import static android.view.MotionEvent.ACTION_UP;
+
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.ArgumentMatchers.floatThat;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyNoMoreInteractions;
+import static org.mockito.Mockito.verifyZeroInteractions;
+
+import android.os.SystemClock;
+import android.testing.AndroidTestingRunner;
+import android.testing.TestableLooper;
+import android.view.MotionEvent;
+import android.view.WindowManager;
+
+import androidx.test.filters.SmallTest;
+
+import com.android.wm.shell.ShellTestCase;
+import com.android.wm.shell.bubbles.BubblesNavBarMotionEventHandler.MotionEventListener;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+/**
+ * Test {@link MotionEvent} handling in {@link BubblesNavBarMotionEventHandler}.
+ * Verifies that swipe events
+ */
+@SmallTest
+@TestableLooper.RunWithLooper(setAsMainLooper = true)
+@RunWith(AndroidTestingRunner.class)
+public class BubblesNavBarMotionEventHandlerTest extends ShellTestCase {
+
+    private BubblesNavBarMotionEventHandler mMotionEventHandler;
+    @Mock
+    private WindowManager mWindowManager;
+    @Mock
+    private Runnable mInterceptTouchRunnable;
+    @Mock
+    private MotionEventListener mMotionEventListener;
+    private long mMotionEventTime;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        TestableBubblePositioner positioner = new TestableBubblePositioner(getContext(),
+                mWindowManager);
+        mMotionEventHandler = new BubblesNavBarMotionEventHandler(getContext(), positioner,
+                mInterceptTouchRunnable, mMotionEventListener);
+        mMotionEventTime = SystemClock.uptimeMillis();
+    }
+
+    @Test
+    public void testMotionEvent_swipeUpInGestureZone_handled() {
+        mMotionEventHandler.onMotionEvent(newEvent(ACTION_DOWN, 0, 990));
+        mMotionEventHandler.onMotionEvent(newEvent(ACTION_MOVE, 0, 690));
+        mMotionEventHandler.onMotionEvent(newEvent(ACTION_MOVE, 0, 490));
+        mMotionEventHandler.onMotionEvent(newEvent(ACTION_MOVE, 0, 390));
+        mMotionEventHandler.onMotionEvent(newEvent(ACTION_UP, 0, 390));
+
+        verify(mMotionEventListener).onDown(0, 990);
+        verify(mMotionEventListener).onMove(0, -300);
+        verify(mMotionEventListener).onMove(0, -500);
+        verify(mMotionEventListener).onMove(0, -600);
+        // Check that velocity up is about 5000
+        verify(mMotionEventListener).onUp(eq(0f), floatThat(f -> Math.round(f) == -5000));
+        verifyZeroInteractions(mMotionEventListener);
+        verify(mInterceptTouchRunnable).run();
+    }
+
+    @Test
+    public void testMotionEvent_swipeUpOutsideGestureZone_ignored() {
+        mMotionEventHandler.onMotionEvent(newEvent(ACTION_DOWN, 0, 500));
+        mMotionEventHandler.onMotionEvent(newEvent(ACTION_MOVE, 0, 100));
+        mMotionEventHandler.onMotionEvent(newEvent(ACTION_UP, 0, 100));
+
+        verifyZeroInteractions(mMotionEventListener);
+        verifyZeroInteractions(mInterceptTouchRunnable);
+    }
+
+    @Test
+    public void testMotionEvent_horizontalMoveMoreThanTouchSlop_handled() {
+        mMotionEventHandler.onMotionEvent(newEvent(ACTION_DOWN, 0, 990));
+        mMotionEventHandler.onMotionEvent(newEvent(ACTION_MOVE, 100, 990));
+        mMotionEventHandler.onMotionEvent(newEvent(ACTION_UP, 100, 990));
+
+        verify(mMotionEventListener).onDown(0, 990);
+        verify(mMotionEventListener).onMove(100, 0);
+        verify(mMotionEventListener).onUp(0, 0);
+        verifyZeroInteractions(mMotionEventListener);
+        verify(mInterceptTouchRunnable).run();
+    }
+
+    @Test
+    public void testMotionEvent_moveLessThanTouchSlop_ignored() {
+        mMotionEventHandler.onMotionEvent(newEvent(ACTION_DOWN, 0, 990));
+        mMotionEventHandler.onMotionEvent(newEvent(ACTION_MOVE, 0, 989));
+        mMotionEventHandler.onMotionEvent(newEvent(ACTION_UP, 0, 989));
+
+        verify(mMotionEventListener).onDown(0, 990);
+        verifyNoMoreInteractions(mMotionEventListener);
+        verifyZeroInteractions(mInterceptTouchRunnable);
+    }
+
+    @Test
+    public void testMotionEvent_actionCancel_listenerNotified() {
+        mMotionEventHandler.onMotionEvent(newEvent(ACTION_DOWN, 0, 990));
+        mMotionEventHandler.onMotionEvent(newEvent(ACTION_CANCEL, 0, 990));
+        verify(mMotionEventListener).onDown(0, 990);
+        verify(mMotionEventListener).onCancel();
+        verifyNoMoreInteractions(mMotionEventListener);
+        verifyZeroInteractions(mInterceptTouchRunnable);
+    }
+
+    private MotionEvent newEvent(int actionDown, float x, float y) {
+        MotionEvent event = MotionEvent.obtain(0L, mMotionEventTime, actionDown, x, y, 0);
+        mMotionEventTime += 10;
+        return event;
+    }
+}

libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/bubbles/animation/ExpandedViewAnimationControllerTest.java

@@ -0,0 +1,181 @@
+/*
+ * Copyright (C) 2022 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.wm.shell.bubbles.animation;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.junit.Assume.assumeTrue;
+import static org.mockito.ArgumentMatchers.anyInt;
+import static org.mockito.Mockito.atLeastOnce;
+import static org.mockito.Mockito.reset;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.testing.AndroidTestingRunner;
+import android.testing.TestableLooper;
+import android.view.ViewConfiguration;
+import android.view.WindowManager;
+
+import androidx.test.filters.SmallTest;
+
+import com.android.wm.shell.ShellTestCase;
+import com.android.wm.shell.bubbles.BubbleExpandedView;
+import com.android.wm.shell.bubbles.TestableBubblePositioner;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+@SmallTest
+@RunWith(AndroidTestingRunner.class)
+@TestableLooper.RunWithLooper(setAsMainLooper = true)
+public class ExpandedViewAnimationControllerTest extends ShellTestCase {
+
+    private ExpandedViewAnimationController mController;
+
+    @Mock
+    private WindowManager mWindowManager;
+
+    @Mock
+    private BubbleExpandedView mMockExpandedView;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+
+        TestableBubblePositioner positioner = new TestableBubblePositioner(getContext(),
+                mWindowManager);
+        mController = new ExpandedViewAnimationControllerImpl(getContext(), positioner);
+
+        mController.setExpandedView(mMockExpandedView);
+        when(mMockExpandedView.getContentHeight()).thenReturn(1000);
+    }
+
+    @Test
+    public void testUpdateDrag_expandedViewMovesUpAndClipped() {
+        // Drag by 50 pixels which corresponds to 10 pixels with overscroll
+        int dragDistance = 50;
+        int dampenedDistance = 10;
+
+        mController.updateDrag(dragDistance);
+
+        verify(mMockExpandedView).setTopClip(dampenedDistance);
+        verify(mMockExpandedView).setContentTranslationY(-dampenedDistance);
+        verify(mMockExpandedView).setManageButtonTranslationY(-dampenedDistance);
+    }
+
+    @Test
+    public void testUpdateDrag_zOrderUpdates() {
+        mController.updateDrag(10);
+        mController.updateDrag(20);
+
+        verify(mMockExpandedView, times(1)).setSurfaceZOrderedOnTop(true);
+        verify(mMockExpandedView, times(1)).setAnimating(true);
+    }
+
+    @Test
+    public void testUpdateDrag_moveBackToZero_zOrderRestored() {
+        mController.updateDrag(50);
+        reset(mMockExpandedView);
+        mController.updateDrag(0);
+        mController.updateDrag(0);
+
+        verify(mMockExpandedView, times(1)).setSurfaceZOrderedOnTop(false);
+        verify(mMockExpandedView, times(1)).setAnimating(false);
+    }
+
+    @Test
+    public void testUpdateDrag_hapticFeedbackOnlyOnce() {
+        // Drag by 10 which is below the collapse threshold - no feedback
+        mController.updateDrag(10);
+        verify(mMockExpandedView, times(0)).performHapticFeedback(anyInt());
+        // 150 takes it over the threshold - perform feedback
+        mController.updateDrag(150);
+        verify(mMockExpandedView, times(1)).performHapticFeedback(anyInt());
+        // Continue dragging, no more feedback
+        mController.updateDrag(200);
+        verify(mMockExpandedView, times(1)).performHapticFeedback(anyInt());
+        // Drag below threshold and over again - no more feedback
+        mController.updateDrag(10);
+        mController.updateDrag(150);
+        verify(mMockExpandedView, times(1)).performHapticFeedback(anyInt());
+    }
+
+    @Test
+    public void testShouldCollapse_doNotCollapseIfNotDragged() {
+        assertThat(mController.shouldCollapse()).isFalse();
+    }
+
+    @Test
+    public void testShouldCollapse_doNotCollapseIfVelocityDown() {
+        assumeTrue("Min fling velocity should be > 1 for this test", getMinFlingVelocity() > 1);
+        mController.setSwipeVelocity(getVelocityAboveMinFling());
+        assertThat(mController.shouldCollapse()).isFalse();
+    }
+
+    @Test
+    public void tesShouldCollapse_doNotCollapseIfVelocityUpIsSmall() {
+        assumeTrue("Min fling velocity should be > 1 for this test", getMinFlingVelocity() > 1);
+        mController.setSwipeVelocity(-getVelocityBelowMinFling());
+        assertThat(mController.shouldCollapse()).isFalse();
+    }
+
+    @Test
+    public void testShouldCollapse_collapseIfVelocityUpIsLarge() {
+        assumeTrue("Min fling velocity should be > 1 for this test", getMinFlingVelocity() > 1);
+        mController.setSwipeVelocity(-getVelocityAboveMinFling());
+        assertThat(mController.shouldCollapse()).isTrue();
+    }
+
+    @Test
+    public void testShouldCollapse_collapseIfPastThreshold() {
+        mController.updateDrag(500);
+        assertThat(mController.shouldCollapse()).isTrue();
+    }
+
+    @Test
+    public void testReset() {
+        mController.updateDrag(100);
+        reset(mMockExpandedView);
+        mController.reset();
+        verify(mMockExpandedView, atLeastOnce()).setAnimating(false);
+        verify(mMockExpandedView).setContentAlpha(1);
+        verify(mMockExpandedView).setAlpha(1);
+        verify(mMockExpandedView).setManageButtonAlpha(1);
+        verify(mMockExpandedView).setManageButtonAlpha(1);
+        verify(mMockExpandedView).setTopClip(0);
+        verify(mMockExpandedView).setContentTranslationY(-0f);
+        verify(mMockExpandedView).setManageButtonTranslationY(-0f);
+        verify(mMockExpandedView).setBottomClip(0);
+        verify(mMockExpandedView).movePointerBy(0, 0);
+        assertThat(mController.shouldCollapse()).isFalse();
+    }
+
+    private int getVelocityBelowMinFling() {
+        return getMinFlingVelocity() - 1;
+    }
+
+    private int getVelocityAboveMinFling() {
+        return getMinFlingVelocity() + 1;
+    }
+
+    private int getMinFlingVelocity() {
+        return ViewConfiguration.get(getContext()).getScaledMinimumFlingVelocity();
+    }
+}

packages/SystemUI/src/com/android/systemui/flags/Flags.java

@@ -166,6 +166,13 @@ public class Flags {
     public static final SysPropBooleanFlag WM_ENABLE_SHELL_TRANSITIONS =
             new SysPropBooleanFlag(1100, "persist.wm.debug.shell_transit", false);
 
+    /**
+     * b/170163464: animate bubbles expanded view collapse with home gesture
+     */
+    @Keep
+    public static final SysPropBooleanFlag BUBBLES_HOME_GESTURE =
+            new SysPropBooleanFlag(1101, "persist.wm.debug.bubbles_home_gesture", false);
+
     // 1200 - predictive back
     @Keep
     public static final SysPropBooleanFlag WM_ENABLE_PREDICTIVE_BACK = new SysPropBooleanFlag(