findViewById(android.R.id.statusBarBackground) returns null

Question

I'm trying to get StatusBarView (I need it for activity shared element transition animation).

I use the following code in my activity:

View decorView = getWindow().getDecorView();
View statusBar = decorView.findViewById(android.R.id.statusBarBackground);

But statusBar is always null. I tried this code after onCreate() and after onResume() - no effect.

What's wrong?

@IntelliJAmiya nop, you can get some views with it, like getWindow().getDecorView().findViewById(android.R.id.content) that return root view from current activity — FarshidABZ, Nov 07 '17 at 13:16
You can't get status bar view from android R file. Why do you want to get it ? — FarshidABZ, Nov 07 '17 at 13:20
@FarshidABZ, well, have a look at this question and accepted answer https://stackoverflow.com/questions/26600263/how-do-i-prevent-the-status-bar-and-navigation-bar-from-animating-during-an-acti — T.Vert, Nov 07 '17 at 13:21
I got null too, and I read all comments, som people got null and nobody knows why?:D and some got a view!! — FarshidABZ, Nov 07 '17 at 13:44

score 4 · Answer 1 · edited Sep 23 '18 at 18:22

Snippet for those who just need a clean answer without reading the whole topic linked by T.Vert

    final View decor = getWindow().getDecorView();
    decor.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
        @Override
        public boolean onPreDraw() {
            decor.getViewTreeObserver().removeOnPreDrawListener(this);
            View statusBar = decor.findViewById(android.R.id.statusBarBackground);
            return true;
        }
    });

findViewById(android.R.id.statusBarBackground) returns null

1 Answers1

Linked