处理程序/可运行与循环工作 [英] Handler/Runnable not working with loop

问题描述

我试图让我的TextView在一个单独的线程进行更新，以便它不会我的UI放缓。它的工作原理，但是当我在一个while循环来控制它添加，它在一个黑色的屏幕挂程序。

I am trying to get my TextView to update in a separate thread so that it doesn't slow down my UI. It works, but when I add in a while loop to control it, it hangs the program in a black screen.

code：

handler.post(new Runnable(){
           @Override
            public void run() {

            while(media[6].isPlaying()) {

            TextView myText = (TextView)findViewById(R.id.timerT);   

            myText.setText(getTimeString(media[1].getCurrentPosition()));        


            handler.postDelayed(this,10);
                                        }
        }

    });

我以为可运行创建一个新的线程，这意味着这不会发生？还是我厉害了？

I thought that the runnable creates a new thread, meaning that this wouldn't happen? Or am I going badly wrong?

推荐答案

您黑屏，是因为你正在运行的任意时间while循环事件调度线程上：从来没有做到这一点。对于这种要使用的AsyncTask或启动的Runnable在一个单独的线程，然后用View.post只发送定时更新的东西。

Your black screen is because you are running an arbitrary duration while loop on the event dispatch thread: never do this. For something of this sort you want to use AsyncTask or start your Runnable in a separate thread and then use View.post to send the timer updates only.

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