private void requestSettingCanDrawOverlays() {
        Toast.makeText(MainActivity.this, "請開啟顯示懸浮窗開關!", Toast.LENGTH_LONG).show();
        int sdkInt = Build.VERSION.SDK_INT;
        if (sdkInt >= Build.VERSION_CODES.O) {//8.0以上
            Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION);
            startActivityForResult(intent, REQUEST_DIALOG_PERMISSION);
        } else if (sdkInt >= Build.VERSION_CODES.M) {//6.0-8.0
            Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION);
            intent.setData(Uri.parse("package:" + getPackageName()));
            startActivityForResult(intent, REQUEST_DIALOG_PERMISSION);
        } else {//4.4-6.0一下
            //無需處理了
        }
    }