Android RxJava创建操作符Interval

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

 private Subscription subscribe;
 private void start() {
  if (subscribe == null || subscribe.isUnsubscribed()) {
   subscribe = Observable.interval(3000, 3000, TimeUnit.MILLISECONDS)//延时3000 ，每间隔3000，时间单位
     .observeOn(AndroidSchedulers.mainThread())
     .subscribe(new Action1<Long>() {
      @Override
      public void call(Long aLong) {
       Log.e("1234", "执行一次");
      }
     });
  }
 }

private void stop() {
  if (subscribe != null && !subscribe.isUnsubscribed()) {
   subscribe.unsubscribe();
   Log.e("1234", "停止");
  }
 }