Some fixes for black screen when pressing home button
Pressing home button sometimes involves a rotation (eg. when app is
running in landscape mode but launch is fixed portrait mode). This will
trigger a screen freeze, which clears the transition. We still need to
add the opening app to the opening list even if transition is unset,
otherwise it doesn't wait for app to draw first frame.
Also during rotation, app, launcher and wallpaper all get relaunched.
The transition can't start until the first frame on the new launcher
window comes back. We can't start it based on the draw state of the old
window, because the old window could get removed and readded shortly
after we start the transition, and it shows up as a black frame.
bug: 27391256
bug: 27295820
Change-Id: I346685076657eef209d0fab68f272e218b55e011
diff --git a/services/core/java/com/android/server/wm/WindowSurfacePlacer.java b/services/core/java/com/android/server/wm/WindowSurfacePlacer.java
index e3955fe..ba4e1f1 100644
--- a/services/core/java/com/android/server/wm/WindowSurfacePlacer.java
+++ b/services/core/java/com/android/server/wm/WindowSurfacePlacer.java
@@ -1278,7 +1278,12 @@
"Check opening app=" + wtoken + ": allDrawn="
+ wtoken.allDrawn + " startingDisplayed="
+ wtoken.startingDisplayed + " startingMoved="
- + wtoken.startingMoved);
+ + wtoken.startingMoved + " isRelaunching()="
+ + wtoken.isRelaunching());
+
+ if (wtoken.isRelaunching()) {
+ return false;
+ }
final boolean drawnBeforeRestoring = wtoken.allDrawn;
wtoken.restoreSavedSurfaces();