连锁改造如何调用? [英] How chain Retrofit calls?

问题描述

如何进行一次又一次的改造?

How can I make one retrofit 2 call after another?

我正在阅读有关 RxJava 的文章，并且我已经在使用 RxJava 进行调用，但是我还没有找到如何使用 flatMaps 的好例子.

I'm reading about RxJava and I'm already doing my calls using RxJava, but I havn't found a good exemple of how to use flatMaps.

有人可以向我解释如何做吗?

Can someone explain how to do it to me?

我正在尝试拨打这两个电话，在这两个电话都完成后，我想开始一项新活动.

I'm trying to make these two calls, and after they're both done, I want to start a new activity.

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    Retrofit retrofit = new Retrofit.Builder()
            .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
            .addConverterFactory(GsonConverterFactory.create())
            .baseUrl("http://api.openweathermap.org/data/2.5/")
            .build();

    WeatherService weatherService = retrofit.create(WeatherService.class);
    final Observable<Weather> london = weatherService.getCurrent();

    london.subscribeOn(Schedulers.newThread())
            .observeOn(AndroidSchedulers.mainThread())
            .subscribe(new Subscriber<Weather>() {
                @Override
                public void onCompleted() {

                }

                @Override
                public void onError(Throwable e) {

                }

                @Override
                public void onNext(Weather weather) {

                    Log.i("WEATHER","Weather Name: " + weather.getName());


                }
            });

    final Observable<Wind> windObservable = weatherService.getWind();
    windObservable.subscribeOn(Schedulers.newThread())
            .observeOn(AndroidSchedulers.mainThread())
            .subscribe(new Subscriber<Wind>() {
                @Override
                public void onCompleted() {

                }

                @Override
                public void onError(Throwable e) {

                }

                @Override
                public void onNext(Wind wind) {

                  Log.i("WEATHER","Wind: " + wind.getSpeed().toString());  

                }
            });

}


}

推荐答案

也许这个链接:https://github.com/ReactiveX/RxJava/wiki/Combining-observables 会有所帮助.结帐 zip.最终 switchMap 方法可能对您有用.

Maybe this link: https://github.com/ReactiveX/RxJava/wiki/Combining-observables will help. Checkout for zip. Eventually switchMap method may be useful in Your case.

也许这个例子 http://joluet.github.io/blog/2014/07/07/rxjava-retrofit/ 会帮助你更多.

Maybe this example http://joluet.github.io/blog/2014/07/07/rxjava-retrofit/ will help You even more.

编辑 #2:一些代码

login().switchMap(new Func1<FirstResponse, Observable<SecondResponse>>() {
            @Override
            public Observable<SecondResponse> call(FirstResponse t) {
                if (ApiUtils.isLoginValid(t)) {
                        return profile(t.getToken());
                    }
                    else{
                        return Observable.error(new CustomException());
                    }
                }

            }
        }).subscribe(subscriber());

注意:profile方法返回类型是Observable，订阅者方法类型是Subscriber

Note: profile method return type is is Observable<SecondResponse> and subscriber method type is Subscriber<? super SecondResponse>

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