如何使用RxAndroid和Retrofit 2检索响应体？

概述我正在使用Retrofit 2(beta 4),我希望从使用标准的Call响应转向Rx Android Observable响应.我通过Call< List< ExampleObject>>的简单交换成功切换了我的大多数调用.到Observable< List< ExampleObject>>.我的一些电话使用Call< okhttp3.ResponseBody>,这很好用,但当我换掉Call时, 我正在使用Retrofit 2(beta 4),我希望从使用标准的Call响应转向Rx Android Observable响应.我通过Call< List< ExampleObject>>的简单交换成功切换了我的大多数调用.到Observable< List< ExampleObject>>.我的一些电话使用Call< okhttp3.ResponseBody>,这很好用,但当我换掉Call时,我遇到了一个错误：

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.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(LoginFragment.java:168)            at com.example.app.ui.fragment.LoginFragment.access$lambda(LoginFragment.java)            at com.example.app.ui.fragment.LoginFragment$$Lambda.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

之所以我像往常一样使用ResponseBody而不是另一个对象,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的情况下呢？有没有其他方法可以从Observable获取响应字符串？

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);}

回应尝试：

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.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(LoginFragment.java:160)            at com.example.app.ui.fragment.LoginFragment.access$lambda(LoginFragment.java)            at com.example.app.ui.fragment.LoginFragment$$Lambda.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

解决方法 尝试这样的事情：

import okhttp3.ResponseBody;import retrofit2.Response;@GET("/whatever")Observable<Response<ResponseBody>> getWhatever();

编辑：不要忘记你必须为RxJava指定适配器：

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

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