Android 判断 activity 初始化是否完成

handler.removeMessages(333);
handler.sendEmptyMessageDelayed(333,500);

Handler handler = new Handler(){
    @Override
    public void handleMessage(Message msg) {
        super.handleMessage(msg);
        if(msg.what==0){
            if(frist){
                Drawable drawable = new BitmapDrawable(firstFrame);
                videoView.setBackground(drawable);
            }
        }
       else if (msg.what == 111) {//初始化完成
            if (null != PlayVideoActivity.this.getWindow().getDecorView().getWindowToken()) {
                handler.removeMessages(333);
                Log.e("初始化已经完成", "333");
               // pd.show();
            } else {
                handler.removeMessages(333);
                handler.sendEmptyMessageDelayed(333, 300);
                Log.e("初始化未完成", "333");
            }
        }
        
        
    }
};