Android System overlay window

Question

I\'m trying to create a system overlay. But I keep getting \"permission denied\". I\'m using SDK version 23.

My manifest file:

Answer 1

for users below and above android 8 use

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
   LAYOUT_FLAG = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
} else {
    LAYOUT_FLAG = WindowManager.LayoutParams.TYPE_PHONE;
}