Android中动态更新TextView上的文字

示例代码：

1、新线程，定时更新文字

class testThread extends Thread{
            public void run() {
              Message message = new Message();
          mHandler.sendMessage(message);
       }
}
//在handler中更新UI
private Handler mHandler = new Handler(){
            public void handleMessage(Message msg) {
                textView.setText("你想变的内容");
            };
        };
//启动线程
new testThread().start();

　2、定时器，定时更新文字

private final Timer timer = new Timer();
private TimerTask task;
Handler handler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
        // TODO Auto-generated method stub
        textView.setText("XXXX");
        super.handleMessage(msg);
    }
};

task = new TimerTask() {
    @Override
    public void run() {
        // TODO Auto-generated method stub
        Message message = new Message();
        message.what = 1;
        handler.sendMessage(message);
    }
}; 

timer.schedule(task, 1000, 1000); 

在TimerTask中执行界面相关的代码，比如setText，程序会崩溃。下面这段代码就不能完成更新文字。

TimerTask task = new TimerTask(){
     public void run(){
       mShortTestNo.setText(" Pass");
   }
 };
Timer timer = new Timer();
timer.schedule(task, 6000);