Bring back touch events for double tap and double tap and hold.

This CL includes all subsequent fixes that were caused by  the original change.
Bug: 159168795
Test: atest TouchExplorerTest
Change-Id: I416b90cf49a2804890246f2d52ee3a168059630f

Change-Id: Ibecc5f6cd1cdb682d1026869f6aa03da7f123e08

10 files changed, 527 insertions, 131 deletions

diff --git a/core/java/android/view/MotionEvent.java b/core/java/android/view/MotionEvent.java
index 19eff72ca814..51b0c6b59f3c 100644
--- a/core/java/android/view/MotionEvent.java
+++ b/core/java/android/view/MotionEvent.java
@@ -487,6 +487,21 @@ public final class MotionEvent extends InputEvent implements Parcelable {
     public static final int FLAG_TAINTED = 0x80000000;
 
     /**
+     * Private flag indicating that this event was synthesized by the system and should be delivered
+     * to the accessibility focused view first. When being dispatched such an event is not handled
+     * by predecessors of the accessibility focused view and after the event reaches that view the
+     * flag is cleared and normal event dispatch is performed. This ensures that the platform can
+     * click on any view that has accessibility focus which is semantically equivalent to asking the
+     * view to perform a click accessibility action but more generic as views not implementing click
+     * action correctly can still be activated.
+     *
+     * @hide
+     * @see #isTargetAccessibilityFocus()
+     * @see #setTargetAccessibilityFocus(boolean)
+     */
+    public static final int FLAG_TARGET_ACCESSIBILITY_FOCUS = 0x40000000;
+
+    /**
      * Flag indicating the motion event intersected the top edge of the screen.
      */
     public static final int EDGE_TOP = 0x00000001;
@@ -2140,6 +2155,20 @@ public final class MotionEvent extends InputEvent implements Parcelable {
     }
 
     /** @hide */
+    public  boolean isTargetAccessibilityFocus() {
+        final int flags = getFlags();
+        return (flags & FLAG_TARGET_ACCESSIBILITY_FOCUS) != 0;
+    }
+
+    /** @hide */
+    public void setTargetAccessibilityFocus(boolean targetsFocus) {
+        final int flags = getFlags();
+        nativeSetFlags(mNativePtr, targetsFocus
+                ? flags | FLAG_TARGET_ACCESSIBILITY_FOCUS
+                : flags & ~FLAG_TARGET_ACCESSIBILITY_FOCUS);
+    }
+
+    /** @hide */
     public final boolean isHoverExitPending() {
         final int flags = getFlags();
         return (flags & FLAG_HOVER_EXIT_PENDING) != 0;
diff --git a/core/java/android/view/View.java b/core/java/android/view/View.java
index 2168fe331972..f4809a99387f 100644
--- a/core/java/android/view/View.java
+++ b/core/java/android/view/View.java
@@ -14319,6 +14319,14 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
      */
     public boolean dispatchTouchEvent(MotionEvent event) {
         // If the event should be handled by accessibility focus first.
+        if (event.isTargetAccessibilityFocus()) {
+            // We don't have focus or no virtual descendant has it, do not handle the event.
+            if (!isAccessibilityFocusedViewOrHost()) {
+                return false;
+            }
+            // We have focus and got the event, then use normal event dispatch.
+            event.setTargetAccessibilityFocus(false);
+        }
         boolean result = false;
 
         if (mInputEventConsistencyVerifier != null) {
diff --git a/core/java/android/view/ViewGroup.java b/core/java/android/view/ViewGroup.java
index 05b75e4f0d41..347bb4191091 100644
--- a/core/java/android/view/ViewGroup.java
+++ b/core/java/android/view/ViewGroup.java
@@ -2048,8 +2048,26 @@ public abstract class ViewGroup extends View implements ViewParent, ViewManager
             for (int i = childrenCount - 1; i >= 0; i--) {
                 final int childIndex = getAndVerifyPreorderedIndex(childrenCount, i, customOrder);
                 final View child = getAndVerifyPreorderedView(preorderedList, children, childIndex);
+                View childWithAccessibilityFocus =
+                        event.isTargetAccessibilityFocus()
+                                ? findChildWithAccessibilityFocus()
+                                : null;
+
                 if (!child.canReceivePointerEvents()
                         || !isTransformedTouchPointInView(x, y, child, null)) {
+
+                    // If there is a view that has accessibility focus we want it
+                    // to get the event first and if not handled we will perform a
+                    // normal dispatch. We may do a double iteration but this is
+                    // safer given the timeframe.
+                    if (childWithAccessibilityFocus != null) {
+                        if (childWithAccessibilityFocus != child) {
+                            continue;
+                        }
+                        childWithAccessibilityFocus = null;
+                        i = childrenCount - 1;
+                    }
+                    event.setTargetAccessibilityFocus(false);
                     continue;
                 }
                 final PointerIcon pointerIcon =
@@ -2617,6 +2635,12 @@ public abstract class ViewGroup extends View implements ViewParent, ViewManager
             mInputEventConsistencyVerifier.onTouchEvent(ev, 1);
         }
 
+        // If the event targets the accessibility focused view and this is it, start
+        // normal event dispatch. Maybe a descendant is what will handle the click.
+        if (ev.isTargetAccessibilityFocus() && isAccessibilityFocusedViewOrHost()) {
+            ev.setTargetAccessibilityFocus(false);
+        }
+
         boolean handled = false;
         if (onFilterTouchEventForSecurity(ev)) {
             final int action = ev.getAction();
@@ -2647,6 +2671,13 @@ public abstract class ViewGroup extends View implements ViewParent, ViewManager
                 // so this view group continues to intercept touches.
                 intercepted = true;
             }
+
+            // If intercepted, start normal event dispatch. Also if there is already
+            // a view that is handling the gesture, do normal event dispatch.
+            if (intercepted || mFirstTouchTarget != null) {
+                ev.setTargetAccessibilityFocus(false);
+            }
+
             // Check for cancelation.
             final boolean canceled = resetCancelNextUpFlag(this)
                     || actionMasked == MotionEvent.ACTION_CANCEL;
@@ -2658,6 +2689,14 @@ public abstract class ViewGroup extends View implements ViewParent, ViewManager
             TouchTarget newTouchTarget = null;
             boolean alreadyDispatchedToNewTouchTarget = false;
             if (!canceled && !intercepted) {
+                // If the event is targeting accessibility focus we give it to the
+                // view that has accessibility focus and if it does not handle it
+                // we clear the flag and dispatch the event to all children as usual.
+                // We are looking up the accessibility focused host to avoid keeping
+                // state since these events are very rare.
+                View childWithAccessibilityFocus = ev.isTargetAccessibilityFocus()
+                        ? findChildWithAccessibilityFocus() : null;
+
                 if (actionMasked == MotionEvent.ACTION_DOWN
                         || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN)
                         || actionMasked == MotionEvent.ACTION_HOVER_MOVE) {
@@ -2720,6 +2759,10 @@ public abstract class ViewGroup extends View implements ViewParent, ViewManager
                                 alreadyDispatchedToNewTouchTarget = true;
                                 break;
                             }
+
+                            // The accessibility focus didn't handle the event, so clear
+                            // the flag and do a normal dispatch to all children.
+                            ev.setTargetAccessibilityFocus(false);
                         }
                         if (preorderedList != null) preorderedList.clear();
                     }
@@ -2803,6 +2846,34 @@ public abstract class ViewGroup extends View implements ViewParent, ViewManager
         return buildOrderedChildList();
     }
 
+     /**
+     * Finds the child which has accessibility focus.
+     *
+     * @return The child that has focus.
+     */
+    private View findChildWithAccessibilityFocus() {
+        ViewRootImpl viewRoot = getViewRootImpl();
+        if (viewRoot == null) {
+            return null;
+        }
+
+        View current = viewRoot.getAccessibilityFocusedHost();
+        if (current == null) {
+            return null;
+        }
+
+        ViewParent parent = current.getParent();
+        while (parent instanceof View) {
+            if (parent == this) {
+                return current;
+            }
+            current = (View) parent;
+            parent = current.getParent();
+        }
+
+        return null;
+    }
+
     /**
      * Resets all touch state in preparation for a new cycle.
      */
@@ -3258,8 +3329,8 @@ public abstract class ViewGroup extends View implements ViewParent, ViewManager
             }
             default:
                 throw new IllegalStateException("descendant focusability must be "
-                        + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS "
-                        + "but is " + descendantFocusability);
+            + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS "
+            + "but is " + descendantFocusability);
         }
         if (result && !isLayoutValid() && ((mPrivateFlags & PFLAG_WANTS_FOCUS) == 0)) {
             mPrivateFlags |= PFLAG_WANTS_FOCUS;
@@ -4923,7 +4994,8 @@ public abstract class ViewGroup extends View implements ViewParent, ViewManager
         if (params == null) {
             params = generateDefaultLayoutParams();
             if (params == null) {
-                throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null");
+                throw new IllegalArgumentException(
+                        "generateDefaultLayoutParams() cannot return null  ");
             }
         }
         addView(child, index, params);
diff --git a/diff b/diff
deleted file mode 100644
index 5c75d88e6789..000000000000
--- a/diff
+++ /dev/null
@@ -1,25 +0,0 @@
-diff --git a/services/accessibility/java/com/android/server/accessibility/AbstractAccessibilityServiceConnection.java b/services/accessibility/java/com/android/server/accessibility/AbstractAccessibilityServiceConnection.java
-index fc43882..832dc91 100644
---- a/services/accessibility/java/com/android/server/accessibility/AbstractAccessibilityServiceConnection.java
-+++ b/services/accessibility/java/com/android/server/accessibility/AbstractAccessibilityServiceConnection.java
-@@ -67,6 +67,7 @@ import java.util.Arrays;
- import java.util.HashSet;
- import java.util.List;
- import java.util.Set;
-+import java.util.NoSuchElementException;
- 
- /**
-  * This class represents an accessibility client - either an AccessibilityService or a UiAutomation.
-@@ -978,7 +979,11 @@ abstract class AbstractAccessibilityServiceConnection extends IAccessibilityServ
-                 /* ignore */
-         }
-         if (mService != null) {
--            mService.unlinkToDeath(this, 0);
-+            try {
-+                mService.unlinkToDeath(this, 0);
-+            }catch(NoSuchElementException e) {
-+                Slog.e(LOG_TAG, "Failed unregistering death link");
-+            }
-             mService = null;
-         }
- 
diff --git a/services/accessibility/java/com/android/server/accessibility/AccessibilityManagerService.java b/services/accessibility/java/com/android/server/accessibility/AccessibilityManagerService.java
index c92571ce31b0..2cd4c6939fa9 100644
--- a/services/accessibility/java/com/android/server/accessibility/AccessibilityManagerService.java
+++ b/services/accessibility/java/com/android/server/accessibility/AccessibilityManagerService.java
@@ -56,6 +56,8 @@ import android.content.pm.PackageManagerInternal;
 import android.content.pm.ResolveInfo;
 import android.content.pm.ServiceInfo;
 import android.database.ContentObserver;
+import android.graphics.Point;
+import android.graphics.Rect;
 import android.graphics.Region;
 import android.hardware.display.DisplayManager;
 import android.hardware.fingerprint.IFingerprintService;
@@ -194,6 +196,9 @@ public class AccessibilityManagerService extends IAccessibilityManager.Stub
     private final SimpleStringSplitter mStringColonSplitter =
             new SimpleStringSplitter(COMPONENT_NAME_SEPARATOR);
 
+    private final Rect mTempRect = new Rect();
+    private final Rect mTempRect1 = new Rect();
+
     private final PackageManager mPackageManager;
 
     private final PowerManager mPowerManager;
@@ -251,6 +256,7 @@ public class AccessibilityManagerService extends IAccessibilityManager.Stub
     //TODO: Remove this hack
     private boolean mInitialized;
 
+    private Point mTempPoint = new Point();
     private boolean mIsAccessibilityButtonShown;
 
     private AccessibilityUserState getCurrentUserStateLocked() {
@@ -1086,6 +1092,18 @@ public class AccessibilityManagerService extends IAccessibilityManager.Stub
     }
 
     /**
+     * Gets a point within the accessibility focused node where we can send down
+     * and up events to perform a click.
+     *
+     * @param outPoint The click point to populate.
+     * @return Whether accessibility a click point was found and set.
+     */
+    // TODO: (multi-display) Make sure this works for multiple displays.
+    public boolean getAccessibilityFocusClickPointInScreen(Point outPoint) {
+        return getInteractionBridge().getAccessibilityFocusClickPointInScreenNotLocked(outPoint);
+    }
+
+    /**
      * Perform an accessibility action on the view that currently has accessibility focus.
      * Has no effect if no item has accessibility focus, if the item with accessibility
      * focus does not expose the specified action, or if the action fails.
@@ -1099,6 +1117,32 @@ public class AccessibilityManagerService extends IAccessibilityManager.Stub
         return getInteractionBridge().performActionOnAccessibilityFocusedItemNotLocked(action);
     }
 
+    /**
+     * Returns true if accessibility focus is confined to the active window.
+     */
+    public boolean accessibilityFocusOnlyInActiveWindow() {
+        synchronized (mLock) {
+            return mA11yWindowManager.isTrackingWindowsLocked();
+        }
+    }
+
+    /**
+     * Gets the bounds of a window.
+     *
+     * @param outBounds The output to which to write the bounds.
+     */
+    boolean getWindowBounds(int windowId, Rect outBounds) {
+        IBinder token;
+        synchronized (mLock) {
+            token = getWindowToken(windowId, mCurrentUserId);
+        }
+        mWindowManagerService.getWindowFrame(token, outBounds);
+        if (!outBounds.isEmpty()) {
+            return true;
+        }
+        return false;
+    }
+
     public int getActiveWindowId() {
         return mA11yWindowManager.getActiveWindowId(mCurrentUserId);
     }
@@ -1877,9 +1921,11 @@ public class AccessibilityManagerService extends IAccessibilityManager.Stub
         for (int i = 0; !observingWindows && (i < boundServiceCount); i++) {
             AccessibilityServiceConnection boundService = boundServices.get(i);
             if (boundService.canRetrieveInteractiveWindowsLocked()) {
+                userState.setAccessibilityFocusOnlyInActiveWindow(false);
                 observingWindows = true;
             }
         }
+        userState.setAccessibilityFocusOnlyInActiveWindow(true);
 
         // Gets all valid displays and start tracking windows of each display if there is at least
         // one bound service that can retrieve window content.
@@ -2997,6 +3043,19 @@ public class AccessibilityManagerService extends IAccessibilityManager.Stub
         }
 
         /**
+         * Gets a point within the accessibility focused node where we can send down and up events
+         * to perform a click.
+         *
+         * @param outPoint The click point to populate.
+         * @return Whether accessibility a click point was found and set.
+         */
+        // TODO: (multi-display) Make sure this works for multiple displays.
+        boolean getAccessibilityFocusClickPointInScreen(Point outPoint) {
+            return getInteractionBridge()
+                    .getAccessibilityFocusClickPointInScreenNotLocked(outPoint);
+        }
+
+    /**
          * Perform an accessibility action on the view that currently has accessibility focus.
          * Has no effect if no item has accessibility focus, if the item with accessibility
          * focus does not expose the specified action, or if the action fails.
@@ -3014,6 +3073,43 @@ public class AccessibilityManagerService extends IAccessibilityManager.Stub
             return focus.performAction(action.getId());
         }
 
+        public boolean getAccessibilityFocusClickPointInScreenNotLocked(Point outPoint) {
+            AccessibilityNodeInfo focus = getAccessibilityFocusNotLocked();
+            if (focus == null) {
+                return false;
+            }
+
+            synchronized (mLock) {
+                Rect boundsInScreen = mTempRect;
+                focus.getBoundsInScreen(boundsInScreen);
+
+                // Apply magnification if needed.
+                MagnificationSpec spec = getCompatibleMagnificationSpecLocked(focus.getWindowId());
+                if (spec != null && !spec.isNop()) {
+                    boundsInScreen.offset((int) -spec.offsetX, (int) -spec.offsetY);
+                    boundsInScreen.scale(1 / spec.scale);
+                }
+
+                // Clip to the window bounds.
+                Rect windowBounds = mTempRect1;
+                getWindowBounds(focus.getWindowId(), windowBounds);
+                if (!boundsInScreen.intersect(windowBounds)) {
+                    return false;
+                }
+
+                // Clip to the screen bounds.
+                Point screenSize = mTempPoint;
+                mDefaultDisplay.getRealSize(screenSize);
+                if (!boundsInScreen.intersect(0, 0, screenSize.x, screenSize.y)) {
+                    return false;
+                }
+
+                outPoint.set(boundsInScreen.centerX(), boundsInScreen.centerY());
+            }
+
+            return true;
+        }
+
         private AccessibilityNodeInfo getAccessibilityFocusNotLocked() {
             final int focusedWindowId;
             synchronized (mLock) {
diff --git a/services/accessibility/java/com/android/server/accessibility/AccessibilityUserState.java b/services/accessibility/java/com/android/server/accessibility/AccessibilityUserState.java
index e54b0f9fb413..f865aa7d6e37 100644
--- a/services/accessibility/java/com/android/server/accessibility/AccessibilityUserState.java
+++ b/services/accessibility/java/com/android/server/accessibility/AccessibilityUserState.java
@@ -105,6 +105,7 @@ class AccessibilityUserState {
     private boolean mIsDisplayMagnificationEnabled;
     private boolean mIsFilterKeyEventsEnabled;
     private boolean mIsPerformGesturesEnabled;
+    private boolean mAccessibilityFocusOnlyInActiveWindow;
     private boolean mIsTextHighContrastEnabled;
     private boolean mIsTouchExplorationEnabled;
     private boolean mServiceHandlesDoubleTap;
@@ -742,6 +743,13 @@ class AccessibilityUserState {
         mIsPerformGesturesEnabled = enabled;
     }
 
+    public boolean isAccessibilityFocusOnlyInActiveWindow() {
+        return mAccessibilityFocusOnlyInActiveWindow;
+    }
+
+    public void setAccessibilityFocusOnlyInActiveWindow(boolean enabled) {
+        mAccessibilityFocusOnlyInActiveWindow = enabled;
+    }
     public ComponentName getServiceChangingSoftKeyboardModeLocked() {
         return mServiceChangingSoftKeyboardMode;
     }
diff --git a/services/accessibility/java/com/android/server/accessibility/gestures/EventDispatcher.java b/services/accessibility/java/com/android/server/accessibility/gestures/EventDispatcher.java
index 667364c9c901..070626be9f80 100644
--- a/services/accessibility/java/com/android/server/accessibility/gestures/EventDispatcher.java
+++ b/services/accessibility/java/com/android/server/accessibility/gestures/EventDispatcher.java
@@ -21,8 +21,11 @@ import static com.android.server.accessibility.gestures.TouchState.ALL_POINTER_I
 import static com.android.server.accessibility.gestures.TouchState.MAX_POINTER_COUNT;
 
 import android.content.Context;
+import android.graphics.Point;
 import android.util.Slog;
 import android.view.MotionEvent;
+import android.view.MotionEvent.PointerCoords;
+import android.view.MotionEvent.PointerProperties;
 import android.view.accessibility.AccessibilityEvent;
 import android.view.accessibility.AccessibilityManager;
 
@@ -37,19 +40,27 @@ import com.android.server.policy.WindowManagerPolicy;
  */
 class EventDispatcher {
     private static final String LOG_TAG = "EventDispatcher";
+    private static final int CLICK_LOCATION_NONE = 0;
+    private static final int CLICK_LOCATION_ACCESSIBILITY_FOCUS = 1;
+    private static final int CLICK_LOCATION_LAST_TOUCH_EXPLORED = 2;
 
     private final AccessibilityManagerService mAms;
     private Context mContext;
     // The receiver of motion events.
     private EventStreamTransformation mReceiver;
-    // Keep track of which pointers sent to the system are down.
-    private int mInjectedPointersDown;
 
-    // The time of the last injected down.
-    private long mLastInjectedDownEventTime;
+    // The long pressing pointer id if coordinate remapping is needed for double tap and hold
+    private int mLongPressingPointerId = -1;
+
+    // The long pressing pointer X if coordinate remapping is needed for double tap and hold.
+    private int mLongPressingPointerDeltaX;
+
+    // The long pressing pointer Y if coordinate remapping is needed for double tap and hold.
+    private int mLongPressingPointerDeltaY;
+
+    // Temporary point to avoid instantiation.
+    private final Point mTempPoint = new Point();
 
-    // The last injected hover event.
-    private MotionEvent mLastInjectedHoverEvent;
     private TouchState mState;
 
     EventDispatcher(
@@ -98,8 +109,18 @@ class EventDispatcher {
         if (action == MotionEvent.ACTION_DOWN) {
             event.setDownTime(event.getEventTime());
         } else {
-            event.setDownTime(getLastInjectedDownEventTime());
+            event.setDownTime(mState.getLastInjectedDownEventTime());
+        }
+        // If the user is long pressing but the long pressing pointer
+        // was not exactly over the accessibility focused item we need
+        // to remap the location of that pointer so the user does not
+        // have to explicitly touch explore something to be able to
+        // long press it, or even worse to avoid the user long pressing
+        // on the wrong item since click and long press behave differently.
+        if (mLongPressingPointerId >= 0) {
+            event = offsetEvent(event, -mLongPressingPointerDeltaX, -mLongPressingPointerDeltaY);
         }
+
         if (DEBUG) {
             Slog.d(
                     LOG_TAG,
@@ -116,7 +137,7 @@ class EventDispatcher {
         } else {
             Slog.e(LOG_TAG, "Error sending event: no receiver specified.");
         }
-        updateState(event);
+        mState.onInjectedMotionEvent(event);
 
         if (event != prototype) {
             event.recycle();
@@ -145,87 +166,15 @@ class EventDispatcher {
         mState.onInjectedAccessibilityEvent(type);
     }
 
-    /**
-     * Processes an injected {@link MotionEvent} event.
-     *
-     * @param event The event to process.
-     */
-    void updateState(MotionEvent event) {
-        final int action = event.getActionMasked();
-        final int pointerId = event.getPointerId(event.getActionIndex());
-        final int pointerFlag = (1 << pointerId);
-        switch (action) {
-            case MotionEvent.ACTION_DOWN:
-            case MotionEvent.ACTION_POINTER_DOWN:
-                mInjectedPointersDown |= pointerFlag;
-                mLastInjectedDownEventTime = event.getDownTime();
-                break;
-            case MotionEvent.ACTION_UP:
-            case MotionEvent.ACTION_POINTER_UP:
-                mInjectedPointersDown &= ~pointerFlag;
-                if (mInjectedPointersDown == 0) {
-                    mLastInjectedDownEventTime = 0;
-                }
-                break;
-            case MotionEvent.ACTION_HOVER_ENTER:
-            case MotionEvent.ACTION_HOVER_MOVE:
-            case MotionEvent.ACTION_HOVER_EXIT:
-                if (mLastInjectedHoverEvent != null) {
-                    mLastInjectedHoverEvent.recycle();
-                }
-                mLastInjectedHoverEvent = MotionEvent.obtain(event);
-                break;
-        }
-        if (DEBUG) {
-            Slog.i(LOG_TAG, "Injected pointer:\n" + toString());
-        }
-    }
-
-    /** Clears the internals state. */
-    public void clear() {
-        mInjectedPointersDown = 0;
-    }
-
-    /** @return The time of the last injected down event. */
-    public long getLastInjectedDownEventTime() {
-        return mLastInjectedDownEventTime;
-    }
-
-    /** @return The number of down pointers injected to the view hierarchy. */
-    public int getInjectedPointerDownCount() {
-        return Integer.bitCount(mInjectedPointersDown);
-    }
-
-    /** @return The bits of the injected pointers that are down. */
-    public int getInjectedPointersDown() {
-        return mInjectedPointersDown;
-    }
-
-    /**
-     * Whether an injected pointer is down.
-     *
-     * @param pointerId The unique pointer id.
-     * @return True if the pointer is down.
-     */
-    public boolean isInjectedPointerDown(int pointerId) {
-        final int pointerFlag = (1 << pointerId);
-        return (mInjectedPointersDown & pointerFlag) != 0;
-    }
-
-    /** @return The the last injected hover event. */
-    public MotionEvent getLastInjectedHoverEvent() {
-        return mLastInjectedHoverEvent;
-    }
-
     @Override
     public String toString() {
         StringBuilder builder = new StringBuilder();
         builder.append("=========================");
         builder.append("\nDown pointers #");
-        builder.append(Integer.bitCount(mInjectedPointersDown));
+        builder.append(Integer.bitCount(mState.getInjectedPointersDown()));
         builder.append(" [ ");
         for (int i = 0; i < MAX_POINTER_COUNT; i++) {
-            if ((mInjectedPointersDown & i) != 0) {
+            if (mState.isInjectedPointerDown(i)) {
                 builder.append(i);
                 builder.append(" ");
             }
@@ -236,6 +185,48 @@ class EventDispatcher {
     }
 
     /**
+     * /** Offsets all pointers in the given event by adding the specified X and Y offsets.
+     *
+     * @param event The event to offset.
+     * @param offsetX The X offset.
+     * @param offsetY The Y offset.
+     * @return An event with the offset pointers or the original event if both offsets are zero.
+     */
+    private MotionEvent offsetEvent(MotionEvent event, int offsetX, int offsetY) {
+        if (offsetX == 0 && offsetY == 0) {
+            return event;
+        }
+        final int remappedIndex = event.findPointerIndex(mLongPressingPointerId);
+        final int pointerCount = event.getPointerCount();
+        PointerProperties[] props = PointerProperties.createArray(pointerCount);
+        PointerCoords[] coords = PointerCoords.createArray(pointerCount);
+        for (int i = 0; i < pointerCount; i++) {
+            event.getPointerProperties(i, props[i]);
+            event.getPointerCoords(i, coords[i]);
+            if (i == remappedIndex) {
+                coords[i].x += offsetX;
+                coords[i].y += offsetY;
+            }
+        }
+        return MotionEvent.obtain(
+                event.getDownTime(),
+                event.getEventTime(),
+                event.getAction(),
+                event.getPointerCount(),
+                props,
+                coords,
+                event.getMetaState(),
+                event.getButtonState(),
+                1.0f,
+                1.0f,
+                event.getDeviceId(),
+                event.getEdgeFlags(),
+                event.getSource(),
+                event.getDisplayId(),
+                event.getFlags());
+    }
+
+    /**
      * Computes the action for an injected event based on a masked action and a pointer index.
      *
      * @param actionMasked The masked action.
@@ -247,7 +238,7 @@ class EventDispatcher {
             case MotionEvent.ACTION_DOWN:
             case MotionEvent.ACTION_POINTER_DOWN:
                 // Compute the action based on how many down pointers are injected.
-                if (getInjectedPointerDownCount() == 0) {
+                if (mState.getInjectedPointerDownCount() == 0) {
                     return MotionEvent.ACTION_DOWN;
                 } else {
                     return (pointerIndex << MotionEvent.ACTION_POINTER_INDEX_SHIFT)
@@ -255,7 +246,7 @@ class EventDispatcher {
                 }
             case MotionEvent.ACTION_POINTER_UP:
                 // Compute the action based on how many down pointers are injected.
-                if (getInjectedPointerDownCount() == 1) {
+                if (mState.getInjectedPointerDownCount() == 1) {
                     return MotionEvent.ACTION_UP;
                 } else {
                     return (pointerIndex << MotionEvent.ACTION_POINTER_INDEX_SHIFT)
@@ -280,7 +271,7 @@ class EventDispatcher {
         for (int i = 0; i < pointerCount; i++) {
             final int pointerId = prototype.getPointerId(i);
             // Do not send event for already delivered pointers.
-            if (!isInjectedPointerDown(pointerId)) {
+            if (!mState.isInjectedPointerDown(pointerId)) {
                 pointerIdBits |= (1 << pointerId);
                 final int action = computeInjectionAction(MotionEvent.ACTION_DOWN, i);
                 sendMotionEvent(
@@ -306,7 +297,7 @@ class EventDispatcher {
         for (int i = 0; i < pointerCount; i++) {
             final int pointerId = prototype.getPointerId(i);
             // Skip non injected down pointers.
-            if (!isInjectedPointerDown(pointerId)) {
+            if (!mState.isInjectedPointerDown(pointerId)) {
                 continue;
             }
             final int action = computeInjectionAction(MotionEvent.ACTION_POINTER_UP, i);
@@ -315,4 +306,103 @@ class EventDispatcher {
             pointerIdBits &= ~(1 << pointerId);
         }
     }
+
+    public boolean longPressWithTouchEvents(MotionEvent event, int policyFlags) {
+        final int pointerIndex = event.getActionIndex();
+        final int pointerId = event.getPointerId(pointerIndex);
+        Point clickLocation = mTempPoint;
+        final int result = computeClickLocation(clickLocation);
+        if (result == CLICK_LOCATION_NONE) {
+            return false;
+        }
+        mLongPressingPointerId = pointerId;
+        mLongPressingPointerDeltaX = (int) event.getX(pointerIndex) - clickLocation.x;
+        mLongPressingPointerDeltaY = (int) event.getY(pointerIndex) - clickLocation.y;
+        sendDownForAllNotInjectedPointers(event, policyFlags);
+        return true;
+    }
+
+    void clear() {
+        mLongPressingPointerId = -1;
+        mLongPressingPointerDeltaX = 0;
+        mLongPressingPointerDeltaY = 0;
+    }
+
+    public void clickWithTouchEvents(MotionEvent event, MotionEvent rawEvent, int policyFlags) {
+        final int pointerIndex = event.getActionIndex();
+        final int pointerId = event.getPointerId(pointerIndex);
+        Point clickLocation = mTempPoint;
+        final int result = computeClickLocation(clickLocation);
+        if (result == CLICK_LOCATION_NONE) {
+            Slog.e(LOG_TAG, "Unable to compute click location.");
+            // We can't send a click to no location, but the gesture was still
+            // consumed.
+            return;
+        }
+        // Do the click.
+        PointerProperties[] properties = new PointerProperties[1];
+        properties[0] = new PointerProperties();
+        event.getPointerProperties(pointerIndex, properties[0]);
+        PointerCoords[] coords = new PointerCoords[1];
+        coords[0] = new PointerCoords();
+        coords[0].x = clickLocation.x;
+        coords[0].y = clickLocation.y;
+        MotionEvent clickEvent =
+                MotionEvent.obtain(
+                        event.getDownTime(),
+                        event.getEventTime(),
+                        MotionEvent.ACTION_DOWN,
+                        1,
+                        properties,
+                        coords,
+                        0,
+                        0,
+                        1.0f,
+                        1.0f,
+                        event.getDeviceId(),
+                        0,
+                        event.getSource(),
+                        event.getDisplayId(),
+                        event.getFlags());
+        final boolean targetAccessibilityFocus = (result == CLICK_LOCATION_ACCESSIBILITY_FOCUS);
+        sendActionDownAndUp(clickEvent, rawEvent, policyFlags, targetAccessibilityFocus);
+        clickEvent.recycle();
+    }
+
+    private int computeClickLocation(Point outLocation) {
+        if (mState.getLastInjectedHoverEventForClick() != null) {
+            final int lastExplorePointerIndex =
+                    mState.getLastInjectedHoverEventForClick().getActionIndex();
+            outLocation.x =
+                    (int) mState.getLastInjectedHoverEventForClick().getX(lastExplorePointerIndex);
+            outLocation.y =
+                    (int) mState.getLastInjectedHoverEventForClick().getY(lastExplorePointerIndex);
+            if (!mAms.accessibilityFocusOnlyInActiveWindow()
+                    || mState.getLastTouchedWindowId() == mAms.getActiveWindowId()) {
+                if (mAms.getAccessibilityFocusClickPointInScreen(outLocation)) {
+                    return CLICK_LOCATION_ACCESSIBILITY_FOCUS;
+                } else {
+                    return CLICK_LOCATION_LAST_TOUCH_EXPLORED;
+                }
+            }
+        }
+        if (mAms.getAccessibilityFocusClickPointInScreen(outLocation)) {
+            return CLICK_LOCATION_ACCESSIBILITY_FOCUS;
+        }
+        return CLICK_LOCATION_NONE;
+    }
+
+    private void sendActionDownAndUp(
+            MotionEvent prototype,
+            MotionEvent rawEvent,
+            int policyFlags,
+            boolean targetAccessibilityFocus) {
+        // Tap with the pointer that last explored.
+        final int pointerId = prototype.getPointerId(prototype.getActionIndex());
+        final int pointerIdBits = (1 << pointerId);
+        prototype.setTargetAccessibilityFocus(targetAccessibilityFocus);
+        sendMotionEvent(prototype, MotionEvent.ACTION_DOWN, rawEvent, pointerIdBits, policyFlags);
+        prototype.setTargetAccessibilityFocus(targetAccessibilityFocus);
+        sendMotionEvent(prototype, MotionEvent.ACTION_UP, rawEvent, pointerIdBits, policyFlags);
+    }
 }
diff --git a/services/accessibility/java/com/android/server/accessibility/gestures/GestureManifold.java b/services/accessibility/java/com/android/server/accessibility/gestures/GestureManifold.java
index 6d0f069e51ac..e9c70c60a322 100644
--- a/services/accessibility/java/com/android/server/accessibility/gestures/GestureManifold.java
+++ b/services/accessibility/java/com/android/server/accessibility/gestures/GestureManifold.java
@@ -104,6 +104,7 @@ class GestureManifold implements GestureMatcher.StateChangeListener {
         mHandler = new Handler(context.getMainLooper());
         mListener = listener;
         mState = state;
+        mMultiFingerGesturesEnabled = false;
         // Set up gestures.
         // Start with double tap.
         mGestures.add(new MultiTap(context, 2, GESTURE_DOUBLE_TAP, this));
@@ -247,7 +248,7 @@ class GestureManifold implements GestureMatcher.StateChangeListener {
          * and hold is dispatched via onGestureCompleted. Otherwise, this method is called when the
          * user has performed a double tap and then held down the second tap.
          */
-        void onDoubleTapAndHold();
+        void onDoubleTapAndHold(MotionEvent event, MotionEvent rawEvent, int policyFlags);
 
         /**
          * When FLAG_SERVICE_HANDLES_DOUBLE_TAP is enabled, this method is not called; double-tap is
@@ -256,7 +257,7 @@ class GestureManifold implements GestureMatcher.StateChangeListener {
          *
          * @return true if the event is consumed, else false
          */
-        boolean onDoubleTap();
+        boolean onDoubleTap(MotionEvent event, MotionEvent rawEvent, int policyFlags);
 
         /**
          * Called when the system has decided the event stream is a potential gesture.
@@ -322,7 +323,7 @@ class GestureManifold implements GestureMatcher.StateChangeListener {
                             new AccessibilityGestureEvent(gestureId, event.getDisplayId());
                     mListener.onGestureCompleted(gestureEvent);
                 } else {
-                    mListener.onDoubleTap();
+                    mListener.onDoubleTap(event, rawEvent, policyFlags);
                 }
                 clear();
                 break;
@@ -332,7 +333,7 @@ class GestureManifold implements GestureMatcher.StateChangeListener {
                             new AccessibilityGestureEvent(gestureId, event.getDisplayId());
                     mListener.onGestureCompleted(gestureEvent);
                 } else {
-                    mListener.onDoubleTapAndHold();
+                    mListener.onDoubleTapAndHold(event, rawEvent, policyFlags);
                 }
                 clear();
                 break;
diff --git a/services/accessibility/java/com/android/server/accessibility/gestures/TouchExplorer.java b/services/accessibility/java/com/android/server/accessibility/gestures/TouchExplorer.java
index 7b5180d7041b..696702fad730 100644
--- a/services/accessibility/java/com/android/server/accessibility/gestures/TouchExplorer.java
+++ b/services/accessibility/java/com/android/server/accessibility/gestures/TouchExplorer.java
@@ -39,7 +39,6 @@ import static com.android.server.accessibility.gestures.TouchState.ALL_POINTER_I
 import android.accessibilityservice.AccessibilityGestureEvent;
 import android.annotation.NonNull;
 import android.content.Context;
-import android.graphics.Point;
 import android.graphics.Region;
 import android.os.Handler;
 import android.util.Slog;
@@ -133,8 +132,6 @@ public class TouchExplorer extends BaseEventStreamTransformation
     // Handle to the accessibility manager service.
     private final AccessibilityManagerService mAms;
 
-    // Temporary point to avoid instantiation.
-    private final Point mTempPoint = new Point();
 
     // Context in which this explorer operates.
     private final Context mContext;
@@ -301,6 +298,7 @@ public class TouchExplorer extends BaseEventStreamTransformation
         if (eventType == TYPE_VIEW_HOVER_EXIT) {
             sendsPendingA11yEventsIfNeeded();
         }
+        mState.onReceivedAccessibilityEvent(event);
         super.onAccessibilityEvent(event);
     }
 
@@ -332,16 +330,15 @@ public class TouchExplorer extends BaseEventStreamTransformation
     }
 
     @Override
-    public void onDoubleTapAndHold() {
-        // Try to use the standard accessibility API to long click
-        if (!mAms.performActionOnAccessibilityFocusedItem(
-                AccessibilityNodeInfo.AccessibilityAction.ACTION_LONG_CLICK)) {
-            Slog.e(LOG_TAG, "ACTION_LONG_CLICK failed.");
+    public void onDoubleTapAndHold(MotionEvent event, MotionEvent rawEvent, int policyFlags) {
+        if (mDispatcher.longPressWithTouchEvents(event, policyFlags)) {
+            sendHoverExitAndTouchExplorationGestureEndIfNeeded(policyFlags);
+            mState.startDelegating();
         }
     }
 
     @Override
-    public boolean onDoubleTap() {
+    public boolean onDoubleTap(MotionEvent event, MotionEvent rawEvent, int policyFlags) {
         mAms.onTouchInteractionEnd();
         // Remove pending event deliveries.
         mSendHoverEnterAndMoveDelayed.cancel();
@@ -357,7 +354,10 @@ public class TouchExplorer extends BaseEventStreamTransformation
         // Try to use the standard accessibility API to click
         if (!mAms.performActionOnAccessibilityFocusedItem(
                 AccessibilityNodeInfo.AccessibilityAction.ACTION_CLICK)) {
-            Slog.e(LOG_TAG, "ACTION_CLICK failed.");
+            Slog.e(LOG_TAG, "ACTION_CLICK failed. Dispatching motion events to simulate click.");
+
+            mDispatcher.clickWithTouchEvents(event, rawEvent, policyFlags);
+            return true;
         }
         return true;
     }
@@ -819,6 +819,7 @@ public class TouchExplorer extends BaseEventStreamTransformation
 
                 // Announce the end of a the touch interaction.
                 mAms.onTouchInteractionEnd();
+                mDispatcher.clear();
                 mDispatcher.sendAccessibilityEvent(TYPE_TOUCH_INTERACTION_END);
 
             } break;
@@ -851,7 +852,7 @@ public class TouchExplorer extends BaseEventStreamTransformation
      * @param policyFlags The policy flags associated with the event.
      */
     private void sendHoverExitAndTouchExplorationGestureEndIfNeeded(int policyFlags) {
-        MotionEvent event = mDispatcher.getLastInjectedHoverEvent();
+        MotionEvent event = mState.getLastInjectedHoverEvent();
         if (event != null && event.getActionMasked() != ACTION_HOVER_EXIT) {
             final int pointerIdBits = event.getPointerIdBits();
             if (!mSendTouchExplorationEndDelayed.isPending()) {
@@ -873,7 +874,7 @@ public class TouchExplorer extends BaseEventStreamTransformation
      * @param policyFlags The policy flags associated with the event.
      */
     private void sendTouchExplorationGestureStartAndHoverEnterIfNeeded(int policyFlags) {
-        MotionEvent event = mDispatcher.getLastInjectedHoverEvent();
+        MotionEvent event = mState.getLastInjectedHoverEvent();
         if (event != null && event.getActionMasked() == ACTION_HOVER_EXIT) {
             final int pointerIdBits = event.getPointerIdBits();
             mDispatcher.sendMotionEvent(
@@ -1198,7 +1199,6 @@ public class TouchExplorer extends BaseEventStreamTransformation
                 + ", mDetermineUserIntentTimeout: " + mDetermineUserIntentTimeout
                 + ", mDoubleTapSlop: " + mDoubleTapSlop
                 + ", mDraggingPointerId: " + mDraggingPointerId
-                + ", mTempPoint: " + mTempPoint
                 + " }";
     }
 }
diff --git a/services/accessibility/java/com/android/server/accessibility/gestures/TouchState.java b/services/accessibility/java/com/android/server/accessibility/gestures/TouchState.java
index d23dbbefd325..7a39bc29e8e5 100644
--- a/services/accessibility/java/com/android/server/accessibility/gestures/TouchState.java
+++ b/services/accessibility/java/com/android/server/accessibility/gestures/TouchState.java
@@ -75,6 +75,16 @@ public class TouchState {
     private MotionEvent mLastReceivedEvent;
     // The accompanying raw event without any transformations.
     private MotionEvent mLastReceivedRawEvent;
+    // The id of the last touch explored window.
+    private int mLastTouchedWindowId;
+    // The last injected hover event.
+    private MotionEvent mLastInjectedHoverEvent;
+    // The last injected hover event used for performing clicks.
+    private MotionEvent mLastInjectedHoverEventForClick;
+    // The time of the last injected down.
+    private long mLastInjectedDownEventTime;
+    // Keep track of which pointers sent to the system are down.
+    private int mInjectedPointersDown;
 
     public TouchState() {
         mReceivedPointerTracker = new ReceivedPointerTracker();
@@ -88,7 +98,9 @@ public class TouchState {
             mLastReceivedEvent.recycle();
             mLastReceivedEvent = null;
         }
+        mLastTouchedWindowId = -1;
         mReceivedPointerTracker.clear();
+        mInjectedPointersDown = 0;
     }
 
     /**
@@ -107,6 +119,71 @@ public class TouchState {
         mReceivedPointerTracker.onMotionEvent(rawEvent);
     }
 
+    /**
+     * Processes an injected {@link MotionEvent} event.
+     *
+     * @param event The event to process.
+     */
+    void onInjectedMotionEvent(MotionEvent event) {
+        final int action = event.getActionMasked();
+        final int pointerId = event.getPointerId(event.getActionIndex());
+        final int pointerFlag = (1 << pointerId);
+        switch (action) {
+            case MotionEvent.ACTION_DOWN:
+            case MotionEvent.ACTION_POINTER_DOWN:
+                mInjectedPointersDown |= pointerFlag;
+                mLastInjectedDownEventTime = event.getDownTime();
+                break;
+            case MotionEvent.ACTION_UP:
+            case MotionEvent.ACTION_POINTER_UP:
+                mInjectedPointersDown &= ~pointerFlag;
+                if (mInjectedPointersDown == 0) {
+                    mLastInjectedDownEventTime = 0;
+                }
+                break;
+            case MotionEvent.ACTION_HOVER_ENTER:
+            case MotionEvent.ACTION_HOVER_MOVE:
+                if (mLastInjectedHoverEvent != null) {
+                    mLastInjectedHoverEvent.recycle();
+                }
+                mLastInjectedHoverEvent = MotionEvent.obtain(event);
+                break;
+            case MotionEvent.ACTION_HOVER_EXIT:
+                if (mLastInjectedHoverEvent != null) {
+                    mLastInjectedHoverEvent.recycle();
+                }
+                mLastInjectedHoverEvent = MotionEvent.obtain(event);
+                if (mLastInjectedHoverEventForClick != null) {
+                    mLastInjectedHoverEventForClick.recycle();
+                }
+                mLastInjectedHoverEventForClick = MotionEvent.obtain(event);
+                break;
+        }
+        if (DEBUG) {
+            Slog.i(LOG_TAG, "Injected pointer:\n" + toString());
+        }
+    }
+
+    /** Updates state in response to an accessibility event received from the outside. */
+    public void onReceivedAccessibilityEvent(AccessibilityEvent event) {
+        // If a new window opens or the accessibility focus moves we no longer
+        // want to click/long press on the last touch explored location.
+        switch (event.getEventType()) {
+            case AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED:
+            case AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED:
+                if (mLastInjectedHoverEventForClick != null) {
+                    mLastInjectedHoverEventForClick.recycle();
+                    mLastInjectedHoverEventForClick = null;
+                }
+                mLastTouchedWindowId = -1;
+                break;
+            case AccessibilityEvent.TYPE_VIEW_HOVER_ENTER:
+            case AccessibilityEvent.TYPE_VIEW_HOVER_EXIT:
+                mLastTouchedWindowId = event.getWindowId();
+                break;
+        }
+    }
+
     public void onInjectedAccessibilityEvent(int type) {
         // The below state transitions go here because the related events are often sent on a
         // delay.
@@ -236,6 +313,46 @@ public class TouchState {
         return mLastReceivedEvent;
     }
 
+    /** @return The the last injected hover event. */
+    public MotionEvent getLastInjectedHoverEvent() {
+        return mLastInjectedHoverEvent;
+    }
+
+    /** @return The time of the last injected down event. */
+    public long getLastInjectedDownEventTime() {
+        return mLastInjectedDownEventTime;
+    }
+
+    public int getLastTouchedWindowId() {
+        return mLastTouchedWindowId;
+    }
+
+    /** @return The number of down pointers injected to the view hierarchy. */
+    public int getInjectedPointerDownCount() {
+        return Integer.bitCount(mInjectedPointersDown);
+    }
+
+    /** @return The bits of the injected pointers that are down. */
+    public int getInjectedPointersDown() {
+        return mInjectedPointersDown;
+    }
+
+    /**
+     * Whether an injected pointer is down.
+     *
+     * @param pointerId The unique pointer id.
+     * @return True if the pointer is down.
+     */
+    public boolean isInjectedPointerDown(int pointerId) {
+        final int pointerFlag = (1 << pointerId);
+        return (mInjectedPointersDown & pointerFlag) != 0;
+    }
+
+    /** @return The the last injected hover event used for a click. */
+    public MotionEvent getLastInjectedHoverEventForClick() {
+        return mLastInjectedHoverEventForClick;
+    }
+
     /** This class tracks where and when a pointer went down. It does not track its movement. */
     class ReceivedPointerTracker {
         private static final String LOG_TAG_RECEIVED_POINTER_TRACKER = "ReceivedPointerTracker";