Question

我正在使用Retrofit 2（beta 4），我希望从使用标准Call响应转向RxAndroid Observable响应。通过从Call<List<ExampleObject>>到Observable<List<ExampleObject>>的简单交换，我成功切换了大部分通话。我的一些电话使用Call<okhttp3.ResponseBody>，效果很好，但当我换出Call时，我遇到了错误：

03-03 15:21:44.237 27333-27333/com.example.app E/AndroidRuntime: FATAL EXCEPTION: main
        Process: com.example.app, PID: 27333
        java.lang.IllegalArgumentException: Unable to create call adapter for rx.Observable<okhttp3.ResponseBody>
            for method AuthenticationService.getLoginForm
            at retrofit2.Utils.methodError(Utils.java:119)
            at retrofit2.MethodHandler.createCallAdapter(MethodHandler.java:52)
            at retrofit2.MethodHandler.create(MethodHandler.java:25)
            at retrofit2.Retrofit.loadMethodHandler(Retrofit.java:164)
            at retrofit2.Retrofit$1.invoke(Retrofit.java:145)
            at java.lang.reflect.Proxy.invoke(Proxy.java:393)
            at $Proxy6.getLoginForm(Unknown Source)
            at com.example.app.ui.fragment.LoginFragment.login(LoginFragment.java:214)
            at com.example.app.ui.fragment.LoginFragment.lambda$onContinue$1(LoginFragment.java:168)
            at com.example.app.ui.fragment.LoginFragment.access$lambda$1(LoginFragment.java)
            at com.example.app.ui.fragment.LoginFragment$$Lambda$4.onClick(Unknown Source)
            at android.view.View.performClick(View.java:5204)
            at android.view.View$PerformClick.run(View.java:21153)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:148)
            at android.app.ActivityThread.main(ActivityThread.java:5417)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
        Caused by: java.lang.IllegalArgumentException: Could not locate call adapter for rx.Observable<okhttp3.ResponseBody>.
         Tried:
          * retrofit2.ExecutorCallAdapterFactory
           at retrofit2.Retrofit.nextCallAdapter(Retrofit.java:230)
           at retrofit2.Retrofit.callAdapter(Retrofit.java:194)
           at retrofit2.MethodHandler.createCallAdapter(MethodHandler.java:50)
              ... 18 more

我像往常一样使用ResponseBody而不是另一个对象的原因是因为在这些情况下我需要解析HTML，据我所知，HTML解析器没有Retrofit转换器。我知道我可能会自己创建一个，但我宁愿不用我需要解析的少量HTML。

我的问题是为什么Retrofit 2 RxJava适配器在Retrofit 2本身没有支持ResponseBody时呢？还有另一种方法可以从Observable获取响应字符串吗？

我的服务：

public interface AuthenticationService() {

    @GET("cas/login")
    Observable<Response<ResponseBody>> login();
}

相关的改造代码：

public static Retrofit getRetrofit() {
    if(mRetrofit == null) {
        return new Retrofit.Builder()
                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
                .addConverterFactory(GsonConverterFactory.create(getGson()))
                .client(getOkHttpClient())
                .build();
    } return mRetrofit;
}

public static AuthenticationService getAuthenticationService() {
    return getRetrofit().create(AuthenticationService.class);
}

响应尝试：

private void login() {
    RestClient.getAuthenticationService().login()
            .observeOn(ASchedulers.newThread())
            .subscribeOn(AndroidSchedulers.mainThread())
            .doOnNext(this::onLoginResponse);
}

private void onLoginResponse(Response<ResponseBody>> response) {
    try {
        parseResponse(response.body().string());
    } catch (IOException) {
        Timber.w(throwable, "Failed to login");
    }
}

新堆栈跟踪：

03-03 16:14:57.848 26866-26866/com.example.app E/AndroidRuntime: FATAL EXCEPTION: main
        Process: com.example.app, PID: 26866
        java.lang.IllegalArgumentException: Unable to create call adapter for rx.Observable<retrofit2.Response<okhttp3.ResponseBody>>
            for method AuthenticationService.getLoginForm
            at retrofit2.Utils.methodError(Utils.java:119)
            at retrofit2.MethodHandler.createCallAdapter(MethodHandler.java:52)
            at retrofit2.MethodHandler.create(MethodHandler.java:25)
            at retrofit2.Retrofit.loadMethodHandler(Retrofit.java:164)
            at retrofit2.Retrofit$1.invoke(Retrofit.java:145)
            at java.lang.reflect.Proxy.invoke(Proxy.java:393)
            at $Proxy3.getLoginForm(Unknown Source)
            at com.example.app.ui.fragment.LoginFragment.login(LoginFragment.java:206)
            at com.example.app.ui.fragment.LoginFragment.lambda$onContinue$1(LoginFragment.java:160)
            at com.example.app.ui.fragment.LoginFragment.access$lambda$1(LoginFragment.java)
            at com.example.app.ui.fragment.LoginFragment$$Lambda$4.onClick(Unknown Source)
            at android.view.View.performClick(View.java:5204)
            at android.view.View$PerformClick.run(View.java:21153)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:148)
            at android.app.ActivityThread.main(ActivityThread.java:5417)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
        Caused by: java.lang.IllegalArgumentException: Could not locate call adapter for rx.Observable<retrofit2.Response<okhttp3.ResponseBody>>.
         Tried:
          * retrofit2.ExecutorCallAdapterFactory
           at retrofit2.Retrofit.nextCallAdapter(Retrofit.java:230)
           at retrofit2.Retrofit.callAdapter(Retrofit.java:194)
           at retrofit2.MethodHandler.createCallAdapter(MethodHandler.java:50)
              ... 18 more

Answer 1

尝试这样的事情：

import okhttp3.ResponseBody;
import retrofit2.Response;

@GET("/whatever")
Observable<Response<ResponseBody>> getWhatever();

编辑：不要忘记您必须为RxJava指定适配器：

    new Retrofit.Builder()
            ...
            .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
            .build()
            .create(Api.class);

如何使用RxAndroid和Retrofit 2检索响应主体？

1 个答案: