android中执行定时任务的几种方式

* handler    private Handler handler;    private Runnable task = new Runnable() {      @Override      public void run() {        Log.i(TAG, "task thread: " + Thread.currentThread().getName()); // main        if (handler != null) {          handler.postDelayed(this, 1000L);  // 继续循环        }      }    };      private void fun4() {        handler = new Handler();        handler.postDelayed(task, 1000L); // 1s后执行                btn2.setOnClickListener(new OnClickListener() {        @Override        public void onClick(View v) {          handler.removeCallbacks(task);  // 停止执行        }      });      }  * AlarmManager    AlarmManager manager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);manager.setRepeating(AlarmManager.RTC_WAKEUP, 1000L, 1000L, pi);  * Timer    Timer senderTimer = new Timer();senderTimer.schedule(new TimerTask() {@Overridepublic void run() {sendProbeData();}}, 1000L, 1000L);