延时处理(Timer/TimerTask,Handler)

> bugs: TimerTask is scheduled already

rx.exceptions.OnErrorNotImplementedException: TimerTask is scheduled already

Caused by: rx.exceptions.OnErrorNotImplementedException: TimerTask is scheduled already。

Timer  timer = new Timer();  timer.schedule(new TimerTask(),8000);

所以同一个定时器任务只能被放置一次.

> Timer与TimerTask的使用

public void schedule(TimerTask task, long delay, long period)，

这个方法是调度一个task，在delay（ms）后开始调度，每次调度完后，最少等待period（ms）后才开始调度。

Timer timer = new Timer();  
timer.schedule(new TimerTask() {  
        public void run() {  
            System.out.println("abc");  
        }  
}, 200000 , 1000);  

> Handler的延时发消息

Handler发送消息，周期性更新UI总结- http://blog.csdn.net/yujiugang/article/details/52881527
handler.post(myRunnable)+runnable的方式处理 
handler.post(myRunnable)、 
handler.postDelayed(myRunnable,time)等方法，将消息交给runnable处理

mHandlerRunnable.postDelayed(myRunnable,1000);
private Handler mHandlerRunnable = new Handler();
    private Runnable myRunnable = new Runnable() {
        @Override
        public void run() {
            tvRunnable.setText("runnable+handle.postdelayer"+1);
        }
    };

private void updateUI(){
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                tvRunOnUi.setText("runOnUiThread"+1);
            }
        });
    }