mHandler.sendEmptyMessageDelayed(1, 10*1000);
  private Handler mHandler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
      super.handleMessage(msg);
      Log.e("流程", "10秒時間已到");
    }
  };

// RxAndroid
compile 'io.reactivex:rxandroid:1.2.1'
// RxJava
compile 'io.reactivex:rxjava:1.2.4'

private void timer() {
    Observable.timer(10000, TimeUnit.MILLISECONDS)
        .observeOn(AndroidSchedulers.mainThread())
        .subscribe(new Action1<Long>() {
          @Override
          public void call(Long aLong) {
            Log.e("流程", "10秒倒計時已結束");
          }
        });
  }

 private Subscription subscribe;
  private void timer() {
    subscribe= Observable.timer(1000,1000,TimeUnit.MILLISECONDS).subscribe(new Subscriber<Long>() {
      @Override
      public void onCompleted() {
      }

      @Override
      public void onError(Throwable e) {

      }

      @Override
      public void onNext(Long aLong) {
        Log.e(TAG, "------>along："+aLong+" time:"+ SystemClock.elapsedRealtime());
      }
    });
  }

 private void stop() {
    if (subscribe != null && !subscribe.isUnsubscribed()) {
      subscribe.unsubscribe();
    }
  }