use rxjava2 implement multiple clicks event detection

rxjava2_multiple_clicks_sample.java

 //triple clicks trigger toast git commit_id
 Observable<Object> observable = RxView.clicks(stv_version).share();
 observable.buffer(observable.debounce(500, TimeUnit.MILLISECONDS))
         .observeOn(AndroidSchedulers.mainThread())
         .compose(RxHelper.<List<Object>>lifeCycle(this))
         .subscribe(new Consumer<List<Object>>() {
                @Override
                public void accept(List<Object> objects) throws Exception {
                    if (objects.size() >= 3) {
                        new ToastView(OtherMoreActivity.this, BuildConfig.GIT_SHA).show();
                    }
                    //    ZLog.i(TAG, "accept:" + objects.size());
                    }
         });