Issue summary:
========================== ==========================================
1)The app starts with Activity A, which simply shows a button called "Launch B". 2)Press this button -- this executes startActivity(FLAG_ACTIVITY_REORDER_TO_FRONT, ActivityB.class). 3)Activity B becomes active, which do some UI and backhand loading operation on UI thread. 4)After pressing back from Activity B, OnBackPressed Of Activity B, this executes startActivity(FLAG_ACTIVITY_REORDER_TO_FRONT, ActivityA.class). 5)Activity A's onResume() is called as expected and everything looks fine (I can see Activity A content again). 6)Press the device's Back key and App freezes for around 10 seconds or more and comes out of application. Without calling onPause(), onDestroy(). (So it may be anr with certain logs) 7)Sometime or may be repeating same above step for 4-5 times it also unfortunately force close googlequicksearchbox
After looking at system logs: found some important logs:
E/ActivityManager( 958): Reason: Input dispatching timed out (Waiting because no window has focus but there is a focused application that may eventually add a window when it finishes starting up.)
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Workaround: Use FLAG_ACTIVITY_NEW_TASK to start an activity example
that disappears after creation in the onNewIntent of the target Activity of FLAG_ACTIVITY_REORDER_TO_FRONT :
@Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
if ((intent.getFlags() & Intent.FLAG_ACTIVITY_REORDER_TO_FRONT) != 0 && Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
Intent trickIntent = new Intent(context, TrickActivity.class);
trickIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(trickIntent);
}
}
in
public class TrickActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate (savedInstanceState);
finish();
}
@Override
public void finish() {
super.finish();
// disable the animation
overridePendingTransition(0, 0);
}
}