Merge "Prevent the launching activity be reparented into embedded task" into sc-v2-dev am: faf3acad45

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15390753

Change-Id: I878299bdb80bf2880fd5505b8ce9427a44a8c0f0

services/core/java/com/android/server/wm/ActivityStarter.java

@@ -2784,7 +2784,8 @@ class ActivityStarter {
             }
         } else {
             // Use the child TaskFragment (if any) as the new parent if the activity can be embedded
-            final ActivityRecord top = task.topRunningActivity();
+            final ActivityRecord top = task.topRunningActivity(false /* focusableOnly */,
+                    false /* includingEmbeddedTask */);
             newParent = top != null ? top.getTaskFragment() : task;
         }
 

services/core/java/com/android/server/wm/RootWindowContainer.java

@@ -365,8 +365,26 @@ class RootWindowContainer extends WindowContainer<DisplayContent>
                 return false;
             }
 
+            if (matchingCandidate(task)) {
+                return true;
+            }
+
+            // Looking for the embedded tasks (if any)
+            return !task.isLeafTaskFragment() && task.forAllLeafTaskFragments(
+                    this::matchingCandidate);
+        }
+
+        boolean matchingCandidate(TaskFragment taskFragment) {
+            final Task task = taskFragment.asTask();
+            if (task == null) {
+                return false;
+            }
+
             // Overlays should not be considered as the task's logical top activity.
-            final ActivityRecord r = task.getTopNonFinishingActivity(false /* includeOverlays */);
+            // Activities of the tasks that embedded from this one should not be used.
+            final ActivityRecord r = task.getTopNonFinishingActivity(false /* includeOverlays */,
+                    false /* includingEmbeddedTask */);
+
             if (r == null || r.finishing || r.mUserId != userId
                     || r.launchMode == ActivityInfo.LAUNCH_SINGLE_INSTANCE) {
                 ProtoLog.d(WM_DEBUG_TASKS, "Skipping %s: mismatch root %s", task, r);

services/core/java/com/android/server/wm/Task.java

@@ -1394,14 +1394,6 @@ class Task extends TaskFragment {
         return mFindRootHelper.findRoot(ignoreRelinquishIdentity, setToBottomIfNone);
     }
 
-    ActivityRecord getTopNonFinishingActivity() {
-        return getTopNonFinishingActivity(true /* includeOverlays */);
-    }
-
-    ActivityRecord getTopNonFinishingActivity(boolean includeOverlays) {
-        return getTopActivity(false /*includeFinishing*/, includeOverlays);
-    }
-
     ActivityRecord topRunningActivityLocked() {
         if (getParent() == null) {
             return null;
@@ -2976,11 +2968,53 @@ class Task extends TaskFragment {
     /** Returns the top-most activity that occludes the given one, or {@code null} if none. */
     @Nullable
     ActivityRecord getOccludingActivityAbove(ActivityRecord activity) {
-        final ActivityRecord top = getActivity(ActivityRecord::occludesParent,
-                true /* traverseTopToBottom */, activity);
+        final ActivityRecord top = getActivity(r -> {
+            if (!r.occludesParent()) {
+                return false;
+            }
+            if (r == activity) {
+                // Reached the given activity, return the activity to stop searching.
+                return true;
+            }
+
+            TaskFragment parent = r.getTaskFragment();
+            if (parent == activity.getTaskFragment()) {
+                // Found it. This activity on top of the given activity on the same TaskFragment.
+                return true;
+            }
+            if (isSelfOrNonEmbeddedTask(parent.asTask())) {
+                // Found it. This activity is the direct child of a leaf Task without being
+                // embedded.
+                return true;
+            }
+            // The candidate activity is being embedded. Checking if the bounds of the containing
+            // TaskFragment equals to the outer TaskFragment.
+            TaskFragment grandParent = parent.getParent().asTaskFragment();
+            while (grandParent != null) {
+                if (!parent.getBounds().equals(grandParent.getBounds())) {
+                    // Not occluding the grandparent.
+                    break;
+                }
+                if (isSelfOrNonEmbeddedTask(grandParent.asTask())) {
+                    // Found it. The activity occludes its parent TaskFragment and the parent
+                    // TaskFragment also occludes its parent all the way up.
+                    return true;
+                }
+                parent = grandParent;
+                grandParent = parent.getParent().asTaskFragment();
+            }
+            return false;
+        });
         return top != activity ? top : null;
     }
 
+    private boolean isSelfOrNonEmbeddedTask(Task task) {
+        if (task == this) {
+            return true;
+        }
+        return task != null && !task.isEmbedded();
+    }
+
     @Override
     public SurfaceControl.Builder makeAnimationLeash() {
         return super.makeAnimationLeash().setMetadata(METADATA_TASK_ID, mTaskId);

services/core/java/com/android/server/wm/TaskFragment.java

@@ -614,17 +614,68 @@ class TaskFragment extends WindowContainer<WindowContainer> {
         return false;
     }
 
+    ActivityRecord getTopNonFinishingActivity() {
+        return getTopNonFinishingActivity(true /* includeOverlays */);
+    }
+
+    ActivityRecord getTopNonFinishingActivity(boolean includeOverlays) {
+        return getTopNonFinishingActivity(includeOverlays, true /* includingEmbeddedTask */);
+    }
+
+    /**
+     * Returns the top-most non-finishing activity, even if the activity is NOT ok to show to
+     * the current user.
+     * @param includeOverlays whether the task overlay activity should be included.
+     * @param includingEmbeddedTask whether the activity in a task that being embedded from this
+     *                              one should be included.
+     * @see #topRunningActivity(boolean, boolean)
+     * @see ActivityRecord#okToShowLocked()
+     */
+    ActivityRecord getTopNonFinishingActivity(boolean includeOverlays,
+            boolean includingEmbeddedTask) {
+        // Split into 4 to avoid object creation due to variable capture.
+        if (includeOverlays) {
+            if (includingEmbeddedTask) {
+                return getActivity((r) -> !r.finishing);
+            }
+            return getActivity((r) -> !r.finishing && r.getTask() == this.getTask());
+        }
+
+        if (includingEmbeddedTask) {
+            return getActivity((r) -> !r.finishing && !r.isTaskOverlay());
+        }
+        return getActivity(
+                (r) -> !r.finishing && !r.isTaskOverlay() && r.getTask() == this.getTask());
+    }
+
     ActivityRecord topRunningActivity() {
         return topRunningActivity(false /* focusableOnly */);
     }
 
     ActivityRecord topRunningActivity(boolean focusableOnly) {
-        // Split into 2 to avoid object creation due to variable capture.
+        return topRunningActivity(focusableOnly, true /* includingEmbeddedTask */);
+    }
+
+    /**
+     * Returns the top-most running activity, which the activity is non-finishing and ok to show
+     * to the current user.
+     *
+     * @see ActivityRecord#canBeTopRunning()
+     */
+    ActivityRecord topRunningActivity(boolean focusableOnly, boolean includingEmbeddedTask) {
+        // Split into 4 to avoid object creation due to variable capture.
         if (focusableOnly) {
-            return getActivity((r) -> r.canBeTopRunning() && r.isFocusable());
-        } else {
+            if (includingEmbeddedTask) {
+                return getActivity((r) -> r.canBeTopRunning() && r.isFocusable());
+            }
+            return getActivity(
+                    (r) -> r.canBeTopRunning() && r.isFocusable() && r.getTask() == this.getTask());
+        }
+
+        if (includingEmbeddedTask) {
             return getActivity(ActivityRecord::canBeTopRunning);
         }
+        return getActivity((r) -> r.canBeTopRunning() && r.getTask() == this.getTask());
     }
 
     boolean isTopActivityFocusable() {