RxJava:如何使用zip操作符处理错误？

Question

我正在使用RxJava和RxAndroid与Retrofit2.

Observable<ResponseOne> responseOneObservable = getRetrofitClient().getDataOne()
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread());

Observable<ResponseTwo> responseTwoObservable = getRetrofitClient().getDataTwo()
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread());

在上面两个Observer上使用如下的zip操作符.

 Observable<ArrayList<TestData>> testDataObservable = Observable.zip(responseOneObservable, responseTwoObservable, new Func2<ResponseOne, ResponseTwo, ArrayList<TestData>>() {
            @Override
                public ArrayList<TestData> call(ResponseOne responseOne, ResponseTwo responseTwo) {
                  ArrayList<TestData> testDataList = new ArrayList();
                      // Add test data from response responseOne & responseTwo
                  return testDataList;
            } 
    })
    .subscribeOn(Schedulers.io())
    .observeOn(AndroidSchedulers.mainThread())
    .subscribe(new Subscriber<ArrayList<TestData>>() {

        @Override
        public void onNext(ArrayList<TestData> testDataList) {

        }

        @Override
        public void onCompleted() {
            Log.d(TAG, "onCompleted" );
        }

        @Override
        public void onError(Throwable t) {
            Log.d(TAG, "onError Throwable: " + t.toString() );
        }
    });

如果在改装http呼叫期间发生任何错误 responseOneObservable,responseTwoObservable则它将直接调用onError用户的方法testDataObservable.

我想继续使用zip操作符的call方法,即使两个观察者中的任何一个都获得了成功响应.

如何使用zip运算符处理错误响应？

Answer 1

您可以使用onErrorResumeNext返回一些Observable或onErrorReturn返回一些默认值zip,如:

Observable.zip(
   responseOneObservable
       .onErrorReturn(new Func1<Throwable, ResponseOne>() {
        @Override
        public ResponseOne call(final Throwable throwable) {
            return new ResponseOne();
        }
    }),
   responseTwoObservable
       .onErrorReturn(new Func1<Throwable, ResponseTwo>() {
        @Override
        public ResponseTwo call(final Throwable throwable) {
            return new ResponseTwo();
        }
    }),
   ...

有关详细信息,请参阅onError处理.