Cancelling event due to no windo

点击返回键报错 Cancelling event due to no window focus: KeyEvent

// 监听手机返回键
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
         
            if (addRecordList.size() != 0 || addImgList.size() != 0 || !tvAcdLogText.getText().toString().trim().isEmpty()) {
                dialog();
            } else {
               // 这里是核心代码,点击返回键如果不符合条件,不要马上关闭当前页面,否则就会报标题的错误,加一个延迟器即可
                Handler mHandler= new Handler();
                Runnable r1 = new Runnable() {
                    @Override
                    public void run() {
                        onBackPressed();
                    }};
                mHandler.postDelayed(r1, 300);
            }


        }
        return super.onKeyDown(keyCode, event);
    }