Merge "Run end actions immediately if there are no children to animate." into qt-dev

packages/SystemUI/src/com/android/systemui/bubbles/animation/PhysicsAnimationLayout.java

@@ -202,13 +202,21 @@ public class PhysicsAnimationLayout extends FrameLayout {
             // add a multiple property end listener to the layout that will call the end action
             // provided to startAll() once all animations on the animated properties complete.
             return (endActions) -> {
+                final Runnable runAllEndActions = () -> {
+                    for (Runnable action : endActions) {
+                        action.run();
+                    }
+                };
+
+                // If there aren't any children to animate, just run the end actions.
+                if (mLayout.getChildCount() == 0) {
+                    runAllEndActions.run();
+                    return;
+                }
+
                 if (endActions != null) {
                     mLayout.setEndActionForMultipleProperties(
-                            () -> {
-                                for (Runnable action : endActions) {
-                                    action.run();
-                                }
-                            },
+                            runAllEndActions,
                             allAnimatedProperties.toArray(
                                     new DynamicAnimation.ViewProperty[0]));
                 }

packages/SystemUI/tests/src/com/android/systemui/bubbles/animation/PhysicsAnimationLayoutTest.java

@@ -25,6 +25,7 @@ import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.Mockito.inOrder;
 import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
 
 import android.os.SystemClock;
 import android.testing.AndroidTestingRunner;
@@ -449,6 +450,18 @@ public class PhysicsAnimationLayoutTest extends PhysicsAnimationLayoutTestCase {
         Mockito.verify(allEnd, times(1)).run();
     }
 
+    @Test
+    public void testAnimationsForChildrenFromIndex_noChildren() {
+        mLayout.setController(mTestableController);
+
+        final Runnable after = Mockito.mock(Runnable.class);
+        mTestableController
+                .animationsForChildrenFromIndex(0, (index, animation) -> { })
+                .startAll(after);
+
+        verify(after, Mockito.times(1)).run();
+    }
+
     /**
      * Animation controller with configuration methods whose return values can be set by individual
      * tests.