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$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
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$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
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);
