Java RxAndroid取消谷歌地图对相机的影响

我有一个应用程序，它正在使用谷歌地图和监听摄像头的变化。我的问题是，每次更换相机时，我都必须请求后端。我想做的只是通过使用RxAndroid/Java来限制请求的数量

我的代码如下所示：

Observable.create(new Observable.OnSubscribe<CameraPosition>() {
        @Override
        public void call(Subscriber<? super CameraPosition> subscriber) {
            if (!subscriber.isUnsubscribed()) {
                map.setOnCameraChangeListener(new GoogleMap.OnCameraChangeListener() {
                    @Override
                    public void onCameraChange(CameraPosition cameraPosition) {
                        subscriber.onNext(cameraPosition);
                    }
                });
            }
        }
    }).subscribeOn(AndroidSchedulers.mainThread())
            .observeOn(AndroidSchedulers.mainThread())
            .onErrorResumeNext(Observable.<CameraPosition>empty())
            .debounce(1, TimeUnit.SECONDS)
            .subscribe(cameraPosition -> {
                final LatLngBounds item = map.getProjection().getVisibleRegion().latLngBounds;

                homeActionBarActivity.getNMB().getRide().list(
                        item.southwest.latitude,
                        item.southwest.longitude,
                        item.northeast.latitude,
                        item.northeast.longitude)
                        .subscribeOn(Schedulers.newThread())
                        .observeOn(AndroidSchedulers.mainThread())
                        .onErrorResumeNext(Observable.<List<Ride>>empty())
                        .subscribe(new Action1<List<Ride>>() {
                            @Override
                            public void call(List<Ride> rides) {

                                clearRidePointsFromMap();

                                for (Ride ride : rides) {
                                    if (isAdded())
                                        addRideStartPointToMap(ride);
                                }

                            }
                        });
            });

你知道吗

注意：如果我从Observable.create（…）中取出map.setOnCamerachenglisterner（…），它工作正常。

好的，这似乎（可能）是由于RxJava内部关于如何管理将对象从订阅者传递给观察者的问题。我通过简单地将LatLngBounds放在订阅者内部而不是观察者内部来解决问题

Observable.create(new Observable.OnSubscribe<LatLngBounds>() {
    @Override
    public void call(Subscriber<? super LatLngBounds> subscriber) {
        if (!subscriber.isUnsubscribed()) {
            map.setOnCameraChangeListener(cameraPosition ->
                    subscriber.onNext(map.getProjection().getVisibleRegion().latLngBounds));
        }
    }
}).subscribeOn(AndroidSchedulers.mainThread())
        .observeOn(AndroidSchedulers.mainThread())
        .onErrorResumeNext(Observable.<LatLngBounds>empty())
        .debounce(1, TimeUnit.SECONDS)
        .subscribe(item -> {
            homeActionBarActivity.getNMB().getRide().list(
                    item.southwest.latitude,
                    item.southwest.longitude,
                    item.northeast.latitude,
                    item.northeast.longitude)
                    .subscribeOn(Schedulers.newThread())
                    .observeOn(AndroidSchedulers.mainThread())
                    .onErrorResumeNext(Observable.<List<Ride>>empty())
                    .subscribe(new Action1<List<Ride>>() {
                        @Override
                        public void call(List<Ride> rides) {

                            clearRidePointsFromMap();

                            for (Ride ride : rides) {
                                if (isAdded())
                                    addRideStartPointToMap(ride);
                            }

                        }
                    });
        });

Observable.create（新建Observable.OnSubscribe（））{
@凌驾
public void call（subscriber）也有同样的问题，这种方法解决了它。你有没有机会弄明白为什么这不起作用？这让我不确定在订阅者中做一般的UI工作是否像我想的那样安全。
Observable.create(new Observable.OnSubscribe<LatLngBounds>() {
    @Override
    public void call(Subscriber<? super LatLngBounds> subscriber) {
        if (!subscriber.isUnsubscribed()) {
            map.setOnCameraChangeListener(cameraPosition ->
                    subscriber.onNext(map.getProjection().getVisibleRegion().latLngBounds));
        }
    }
}).subscribeOn(AndroidSchedulers.mainThread())
        .observeOn(AndroidSchedulers.mainThread())
        .onErrorResumeNext(Observable.<LatLngBounds>empty())
        .debounce(1, TimeUnit.SECONDS)
        .subscribe(item -> {
            homeActionBarActivity.getNMB().getRide().list(
                    item.southwest.latitude,
                    item.southwest.longitude,
                    item.northeast.latitude,
                    item.northeast.longitude)
                    .subscribeOn(Schedulers.newThread())
                    .observeOn(AndroidSchedulers.mainThread())
                    .onErrorResumeNext(Observable.<List<Ride>>empty())
                    .subscribe(new Action1<List<Ride>>() {
                        @Override
                        public void call(List<Ride> rides) {

                            clearRidePointsFromMap();

                            for (Ride ride : rides) {
                                if (isAdded())
                                    addRideStartPointToMap(ride);
                            }

                        }
                    });
        });