使用getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT)設定全域性對話方塊
新增許可權

public static void showDialog(String name){
        try {
            if (dialogPtt != null && dialogPtt.isShowing()) {
                return;
            }else if (dialogPtt != null && !dialogPtt.isShowing
 
()){
                dialogPtt.show();
                return;
            }
            dialogPtt = new Dialog(MyApplication.instance);
            View view = LayoutInflater.from(MyApplication.context).inflate(R.layout.dialog_progress, null);
            dialogPtt.setContentView(view);
            TextView tv_name = (TextView) view.findViewById
 
(R.id.tv_name);
            tv_name.setText(name);
            dialogPtt.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
            dialogPtt.show();
            dialogPtt.setCancelable(false);
        }catch (Exception e){
            e.printStackTrace();
        }
    }