Merge "Make transition ready if display becomes empty" into main

2 files changed, 10 insertions, 0 deletions

diff --git a/services/core/java/com/android/server/wm/ActivityRecord.java b/services/core/java/com/android/server/wm/ActivityRecord.java
index d38cd885529a..78a6816593ae 100644
--- a/services/core/java/com/android/server/wm/ActivityRecord.java
+++ b/services/core/java/com/android/server/wm/ActivityRecord.java
@@ -4033,6 +4033,10 @@ final class ActivityRecord extends WindowToken implements WindowManagerService.A
         if (next == null) {
             mRootWindowContainer.ensureVisibilityAndConfig(null /* starting */, mDisplayContent,
                     true /* deferResume */);
+            if (mDisplayContent.topRunningActivity() == null) {
+                // The transition is ready on a display with no running activities.
+                mTransitionController.setReady(mDisplayContent);
+            }
         }
         if (activityRemoved) {
             mRootWindowContainer.resumeFocusedTasksTopActivities();
diff --git a/services/tests/wmtests/src/com/android/server/wm/RootTaskTests.java b/services/tests/wmtests/src/com/android/server/wm/RootTaskTests.java
index 0f28528c9327..e019a416c069 100644
--- a/services/tests/wmtests/src/com/android/server/wm/RootTaskTests.java
+++ b/services/tests/wmtests/src/com/android/server/wm/RootTaskTests.java
@@ -1235,12 +1235,18 @@ public class RootTaskTests extends WindowTestsBase {
         assertEquals(STOPPING, activity2.getState());
         assertThat(mSupervisor.mStoppingActivities).contains(activity2);
 
+        registerTestTransitionPlayer();
+        final Transition transition = display.mTransitionController
+                .requestCloseTransitionIfNeeded(rootTask1);
+        transition.collectClose(rootTask1);
         // The display becomes empty. Since there is no next activity to be idle, the activity
         // should be destroyed immediately with updating configuration to restore original state.
         final ActivityRecord activity1 = finishTopActivity(rootTask1);
         assertEquals(DESTROYING, activity1.getState());
         verify(mRootWindowContainer).ensureVisibilityAndConfig(eq(null) /* starting */,
                 eq(display), anyBoolean());
+        assertTrue("Transition must be ready if there is no next running activity",
+                transition.allReady());
     }
 
     private ActivityRecord finishTopActivity(Task task) {