基础系列 06：Android倒计时一览

有下面几种实现方式：

• Timer和TimerTask(常规实现)

	@Override
	public void run() {
	// do some task
	Log.i("TAG","这是普通方式的TimerTask");
	}
},0,3000);

• Service中开启线程来实现定时器

  private void serviceTimerTask(){
       Thread mythread =  new Thread(new Runnable() {
       @Override
         public void run() {
                 while (true){
    					 try {
                             Thread.sleep(3000);
                           // do other task
                          } catch (InterruptedException e) {
                            e.printStackTrace();
                          }
                        }
                   }
                 });
                 mythread.start();
         }
  

  该定时器的生命周期和Service的生命周期一样，当Service销毁时，该定时任务结束。当退出该应用时，Service不会立即销毁，定时任务不会立即结束.

• ScheduledExecutorService去实现

  /**
     * 开启定时任务
     */
    void timerTask() {
        scheduleService = Executors.newSingleThreadScheduledExecutor();
        Runnable runnable = new Runnable() {
  
            @Override
            public void run() {
                // to do task
                CLog.i(TAG, "to do task");
            }
  
        };
        scheduleGetScanLists = scheduleService.scheduleAtFixedRate(runnable,
                0, 5, TimeUnit.SECONDS);
    }
      
    /**
     * 取消定时任务
     */
    void cancelTimerTask() {
        if (scheduleGetScanLists != null) {
            scheduleGetScanLists.cancel(true);
            scheduleService.shutdown();
        }
    }
  

• 系统的AlarmManager来实现定时任务

参考链接

• 1. http://yifeng.studio/2017/09/26/android-countdowntimer-using-attentions/
• 1. http://blog.csdn.net/s003603u/article/details/53322874
• 1. https://juejin.im/post/58bead54ac502e006b2fe6e0
• 1. https://www.jianshu.com/p/108a14d518a3