从 RxAndroid 访问项目布局?

Access to items layout from RxAndroid?

我正在使用下面的代码:

    mCompositeDisposable.add(myObservable(IdLang, shortTermCoursesModels)
            .subscribeOn(Schedulers.io())
            .observeOn(AndroidSchedulers.mainThread())
            .subscribeWith(new DisposableObserver<String>() {
                @Override
                public void onComplete() {
                }

                @Override
                public void onError(Throwable e) {
                }

                @Override
                public void onNext(String string) {
                    listenerCoursesListItemService.adapterHideProgress();
                }
            }));

并且:

private Observable<String> myObservable(String IdLang, List<GetShortTermCoursesModel> shortTermCoursesModels) {
    return Observable.defer(new Callable<ObservableSource<? extends String>>() {
        @Override
        public ObservableSource<? extends String> call() throws Exception {
            listenerCoursesListItemService.adapterShowProgress();
            for (int i = 0; i < 900000; i++) {
                Log.i("WWWWWWWW", "A " + i);
            }
            return Observable.just("ok");
        }
    });

但是给我以下错误:

 android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.

如何从 RxAndroid.

访问 UI

我的错误在这里:

listenerCoursesListItemService.adapterShowProgress();
listenerCoursesListItemService.adapterHideProgress();

你必须在主线程上订阅:

mCompositeDisposable.add(myObservable(IdLang, shortTermCoursesModels)
        .subscribeOn(AndroidSchedulers.mainThread())
        .observeOn(AndroidSchedulers.mainThread())
        .subscribeWith(new DisposableObserver<String>() {
            @Override
            public void onComplete() {
            }

            @Override
            public void onError(Throwable e) {
            }

            @Override
            public void onNext(String string) {
                listenerCoursesListItemService.adapterHideProgress();
            }
        }));

原因是您试图显示进度 ->

listenerCoursesListItemService.adapterShowProgress(); 

实际上在不同线程 (Schedulers.io()) 而不是 UI 线程 (AndroidSchedulers.mainThread()) 上运行的内部 call() 方法。

相反,您可以在 doOnSubscribe() 方法中显示进度并在 onComplete() 中关闭它。这两种方法都将在 UI 线程上调用。更新了下面的代码以供参考,

mCompositeDisposable.add(myObservable(IdLang, shortTermCoursesModels)
    .subscribeOn(Schedulers.io())
    .observeOn(AndroidSchedulers.mainThread())
    .doOnSubscribe(new Consumer<Disposable>() {
        @Override
        public void accept(@NonNull Disposable disposable) throws Exception {
            listenerCoursesListItemService.adapterShowProgress();
        }
    })
    .doFinally(new Action() {
        @Override
        public void run() throws Exception {
           listenerCoursesListItemService.adapterHideProgress();
        }
    })
    .subscribeWith(new DisposableObserver<String>() {
        @Override
        public void onComplete() {
        }

        @Override
        public void onError(Throwable e) {
        }

        @Override
        public void onNext(String string) {
        }
    }));

并且:

private Observable<String> myObservable(String IdLang, List<GetShortTermCoursesModel> shortTermCoursesModels) {
    return Observable.defer(new Callable<ObservableSource<? extends String>>() {
        @Override
        public ObservableSource<? extends String> call() throws Exception {
            for (int i = 0; i < 900000000; i++) {
                Log.i("WWWWWWWW", "A " + i);
            }
            return Observable.just("ok");
        }
    });
}

在 onNext() 中,您将从 call() 方法中获取 return 的字符串。