带按钮切换RxJava订阅

Question

我一直在尝试使用Android中的单个按钮和merge()将订阅切换为我boolean mSubsciptionToggle的2个Observable。首次创建片段时，切换设置为false。

我正在使用Observable.create()自己创建Observable，看起来像这样：

    Observable<String> observable = Observable.create(observer -> {

        final BroadcastReceiver receiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                // Log incoming broadcasts
            }
        };

        getActivity().registerReceiver(receiver, filter);

        if (mSubscriptionToggle) {
            observer.onComplete();
        }
    });

然后我将OnClickListener添加到按钮中，如下所示：

    mStickyButton.setOnClickListener( (View view) -> {

                // Observables were created from the first code snippet
                Observable.merge(mBatteryObservable, mAirplaneModeObservable)
                        .observeOn(AndroidSchedulers.mainThread())
                        .subscribeOn(AndroidSchedulers.mainThread())
                        .subscribe(// Logging each emitted String);

                // Toggling the subscription each time the button is clicked
                mSubscriptionToggle = !mSubscriptionToggle;
            }
    );

我的问题是：第一次单击该按钮时，onComplete()立即发生。但是，在发生这种情况之前，我打电话给subscribe()：

mSubscriptionToggle = !mSubscriptionToggle

为什么我打电话给subscribe()之后布尔值会发生变化？