Android计时器

private Handler handler  = new Handler(){    public void handleMessage(Message msg) {        super.handleMessage(msg);           //满足条件要执行的内容        if(msg.what == 1&&msg.arg1 == 0){            //        Log.v(TAG, "计时器");    if(todoNum != 0){    todoDocNumTV.setVisibility(View.VISIBLE);    todoDocNumTV.setText(todoNum+"");    isRefresh = 1;    }        }    }};  private Timer timer = new Timer(true); //任务private TimerTask task = new TimerTask() {  public void run() {    Message msg = new Message();    msg.what = 1;    msg.arg1 = isRefresh;    handler.sendMessage(msg);  }};

启动计时器

//启动定时器timer.schedule(task, 0, 1*1000);

当我想停止计时器再重启是遇到一个问题，报错ava.lang.IllegalStateException: TimerTask is scheduled already
发现每根TimerTask只能执行一次schedule
所以只能在重启之前清空之前的任务并重新赋值，然后再启动

if(task != null){task.cancel(); //将原任务从队列中移除}task = new TimerTask() {  public void run() {    Message msg = new Message();    msg.what = 1;    msg.arg1 = 0;    handler.sendMessage(msg);  }};//启动定时器timer.schedule(task, 0, 1*1000);

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