SYSTEM_ALERT_WINDOW PERMISSION on API 26 not working as expected. Permission denied for window type 2002

Question

I am using overlay permission to display certain information in my app. Running it on API 23 - 25 it works fine (asking for permission, granting, etc. according to

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Answer 1

Use following code

int LAYOUT_FLAG = Build.VERSION.SDK_INT >= Build.VERSION_CODES.O ?
            WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY : WindowManager.LayoutParams.TYPE_PHONE;
    mWindowParams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT,
            LAYOUT_FLAG, // Overlay over the other apps.
            LayoutParams.FLAG_NOT_FOCUSABLE    // This flag will enable the back key press.
                    | LayoutParams.FLAG_NOT_TOUCH_MODAL, // make the window to deliver the focus to the BG window.
            PixelFormat.TRANSPARENT);