NullPointerException with AppCompat BottomSheets

Question

LinearLayout bottomSheetViewgroup = (LinearLayout) findViewById(R.id.bottomSheet);

bottomSheetBehavior = BottomSheetBehavior.from(bottomSheetViewgroup);

bottomShee         


        

Answer 1

I've found a solution but I still don't known why this happen. The solution is put this last line to user call directly after the activity is running. Ex: in a contextMenu callback or in any OnClickListener.