commit c2f262bc1ad78783ac40e149ea1373526fc2aefe
author Jorim Jaggi <jjaggi@google.com> Mon Dec 07 16:59:10 2015 -0800
committer Jorim Jaggi <jjaggi@google.com> Wed Dec 09 00:59:37 2015 +0000
tree e3937fcf9ecb42ab4f0e796464fde62743adde13
parent 315574621a6d89cc7141eb61d1195129116fee15

Only take screenshot when hiding activities

So we don't take screenshots when just switching focus between
activities or when docking activities.

Bug: 26070919
Bug: 25845255
Change-Id: Ie924c5f72f4168806b949ad10df7ef139cd280cc

services/core/java/com/android/server/am/ActivityStack.java

diff --git a/services/core/java/com/android/server/am/ActivityStack.java b/services/core/java/com/android/server/am/ActivityStack.java
index 60f26e2..b052d17 100644
--- a/services/core/java/com/android/server/am/ActivityStack.java
+++ b/services/core/java/com/android/server/am/ActivityStack.java
@@ -925,7 +925,7 @@
         final ActivityRecord next = mStackSupervisor.topRunningActivityLocked();
         if (mService.mHasRecents
                 && (next == null || next.noDisplay || next.task != prev.task || uiSleeping)) {
-            prev.updateThumbnailLocked(screenshotActivitiesLocked(prev), null);
+            prev.mUpdateTaskThumbnailWhenHidden = true;
         }
         stopFullyDrawnTraceIfNeeded();
 
@@ -1221,6 +1221,10 @@
 
     private void setVisible(ActivityRecord r, boolean visible) {
         r.visible = visible;
+        if (!visible && r.mUpdateTaskThumbnailWhenHidden) {
+            r.updateThumbnailLocked(r.task.stack.screenshotActivitiesLocked(r), null);
+            r.mUpdateTaskThumbnailWhenHidden = false;
+        }
         mWindowManager.setAppVisibility(r.appToken, visible);
         final ArrayList<ActivityContainer> containers = r.mChildContainers;
         for (int containerNdx = containers.size() - 1; containerNdx >= 0; --containerNdx) {