6a8d2c5e55
Re-launching volume panel continuously will trigger an endless panel loading, show a transparent unfinished UI, and then block the user's screen. Root cause: When the activity receives a new intent from user's clicking, it will call PanelFragment#createPanelContent to update the current fragment. The method triggers an animation and then loads the panel content. If multiple invocations run concurrently before the animation or the loading finish, the loader's countdown latch will be increased abnormally and lead to the endless loading. Solution: 1. Since the invocations are in UI thread, simply add a flag to avoid reentrance when the panel is animating or loading. 2. Filter out the same panel's creation request when the panel is still visible. 3. Do not force a panel's recreation when it's under construction. Bug: 143889510 Bug: 160491854 Test: robotest, manual Change-Id: I821faedeb62354929f3af9804cbbe44ee5bb8a53