Android实现轮询的三种方式

private static final int PERIOD = 10 * 1000;
private static final int DELAY = 100;
private Disposable mDisposable;
/**
 * 定时循环任务
 */
private void timeLoop() {
  mDisposable = Observable.interval(DELAY, PERIOD, TimeUnit.MILLISECONDS)
      .map((aLong -> aLong + 1))
      .subscribeOn(Schedulers.io())
      .observeOn(AndroidSchedulers.mainThread())
      .subscribe(aLong -> getUnreadCount());//getUnreadCount()执行的任务
}
//关闭定时任务
if (mDisposable != null) mDisposable.dispose();

private Handler mHandler = new Handler(Looper.getMainLooper()); // 全局变量
private Runnable mTimeCounterRunnable = new Runnable() {
  @Override
  public void run() {//在此添加需轮寻的接口
getUnreadCount();//getUnreadCount()执行的任务
    mHandler.postDelayed(this, 20 * 1000);
  }
};
//关闭定时任务
mHandler.removeCallbacks(mTimeCounterRunnable);

private static final int PERIOD = 10 * 1000;
private static final int DELAY = 100;
private Timer mTimer;
private TimerTask mTimerTask;
private void timeLoop2(){
  mTimer = new Timer();
  mTimerTask = new TimerTask() {
    @Override
    public void run() {
      //在此添加轮询
    }
  };
  mTimer.schedule(mTimerTask,DELAY,PERIOD);
}
//关闭定时任务
if (mTimer != null) mTimer.cancel();