if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
{
   // On API 23 and later ask the user to grant us permission to draw system overlay
   // windows.
   if (!Settings.canDrawOverlays(this))
   {
      Intent intent = new Intent(
             Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
             Uri.parse("package:" + getPackageName()));
 
      startActivityForResult(intent, REQUEST_PERMISSION_SYSTEM_OVERLAY_RESULT);
   }
}

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data)
    {
        super.onActivityResult(requestCode, resultCode, data);
 
        if(Build.VERSION.SDK_INT < Build.VERSION_CODES.M) return; if(requestCode == REQUEST_PERMISSION_SYSTEM_OVERLAY_RESULT) { if(Settings.canDrawOverlays(this)) { m_permissionSystemOverlayWindowGranted = true; if(m_permissionReadPhoneStateGranted && m_permissionProcessOutgoingCallsGranted) { startService(new Intent(this, EstatePlusService.class)); m_layoutNoPermissions.setVisibility(View.INVISIBLE); m_progressBar.setVisibility(View.INVISIBLE); m_layoutLogin.setVisibility(View.VISIBLE); } } else if(Build.VERSION.SDK_INT == Build.VERSION_CODES.O) { // NOTE: This is a workaround to fix the bug in Android O where the // Settings.canDrawOverlays() will always return 'false' if(canDrawOverlays(this)) { m_permissionSystemOverlayWindowGranted = true; if(m_permissionReadPhoneStateGranted && m_permissionProcessOutgoingCallsGranted) { startService(new Intent(this, EstatePlusService.class)); m_layoutNoPermissions.setVisibility(View.INVISIBLE); m_progressBar.setVisibility(View.INVISIBLE); m_layoutLogin.setVisibility(View.VISIBLE); } } } } } /** * Workaround for Android O */ public static boolean canDrawOverlays(Context context) { try { WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE); if (windowManager == null) { return false; } final View viewToAdd = new View(context); WindowManager.LayoutParams params = new WindowManager.LayoutParams( 0, 0, android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O ?
                                    WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY : WindowManager.LayoutParams.TYPE_SYSTEM_ALERT,
                            WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE, PixelFormat.TRANSPARENT);
            viewToAdd.setLayoutParams(params);
            windowManager.addView(viewToAdd, params);
            windowManager.removeView(viewToAdd);
            return true;
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
 
        return false;
    }