Android ViewGroup crash: Attempt to read from field 'int android.view.View.mViewFlags' on a null object reference

Question

We have found several cases for this kind of crashes reported by backend logging monitoring. It seems the crashes do not tie to particular UX failure. And from the reports,

Answer 1

Possible cause: I was having the exact same issue. It turned out it started to happen when I added code to modify the view tree within onDraw() call. To be specific, I removed a view with children in my derived onDraw() when certain conditions were met. I now believe this is a bad thing to do, probably because the platform is trying to draw views that I have now removed from the view tree. I resolved the issue by posting the deletion with Runnable to happen after the call to onDraw() has finished.