我试图将RxJava与Retrofit一起使用来链接Android中的网络请求。但是正如我在标题中所述,它会导致IllegalArgumentException。在下面的内容中,您可以看到我到目前为止编写的代码(我还包括导入和gradle文件以及用于我的项目的依赖项):
ApiClient.java:
import retrofit2.Retrofit;
import retrofit2.adapter.rxjava2.RxJava2CallAdapterFactory;
import retrofit2.converter.gson.GsonConverterFactory;
import retrofit2.http.GET;
import retrofit2.http.Header;
import retrofit2.http.Path;
import rx.Observable;
public class ApiClient {
// trailing slash is needed
public static final String BASE_URL = "....";
private static CliqueDBApiInterface sCliqueDBApiInterface;
public static CliqueDBApiInterface getCliqueDBApiInterface(){
if(sCliqueDBApiInterface == null){
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.addCallAdapterFactory(RxJava2CallAdapterFactory.create())
.build();
sCliqueDBApiInterface = retrofit.create(CliqueDBApiInterface.class);
}
return sCliqueDBApiInterface;
}
public interface CliqueDBApiInterface{
@GET("statementsOfClique/{idOfClique}")
//Call<ListOfStatements> getStatementsOfTheClique(@Path("idOfClique") int id, @Header("Authorization") String authHeader );
Observable<ListOfStatements> getStatementsOfTheClique(@Path("idOfClique") int id, @Header("Authorization") String authHeader );
}
}
MainActivity.java:
import retrofit2.HttpException;
import rx.Observable;
import rx.Subscriber;
import rx.android.schedulers.AndroidSchedulers;
import rx.schedulers.Schedulers;
// ... some other code
Observable<ListOfStatements> call = service.getStatementsOfTheClique(clique.getId(), authenticationToken);
call.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Subscriber<ListOfStatements>() {
@Override
public void onNext(ListOfStatements listOfStatements) {
// Called once the `ListOfStatements` object is available
List<Statement> statementList = listOfStatements.getStatementsOfClique();
// do something with statementList
}
@Override
public void onCompleted() {
// Nothing to do here
}
@Override
public void onError(Throwable e) {
if (e instanceof HttpException) {
int code = ((HttpException) e).code();
}
}
});
现在gradle文件:
apply plugin: 'com.android.application'
android {
compileSdkVersion 28
defaultConfig {
applicationId "com.celik.abdullah.hefuxi11"
minSdkVersion 19
targetSdkVersion 28
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
packagingOptions{
exclude 'META-INF/rxjava.properties'
}
}
dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
implementation 'com.android.support:recyclerview-v7:28.0.0'
implementation 'com.android.volley:volley:1.1.1'
implementation 'com.google.code.gson:gson:2.8.5'
implementation 'com.android.support:cardview-v7:28.0.0'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
implementation 'com.squareup.retrofit2:converter-gson:2.5.0'
implementation 'com.squareup.retrofit2:retrofit:2.5.0'
implementation 'com.squareup.retrofit2:adapter-rxjava2:2.5.0'
implementation 'io.reactivex:rxandroid:1.2.0'
implementation 'io.reactivex:rxjava:1.1.4'
implementation 'com.squareup.retrofit2:adapter-rxjava2:2.5.0'
}
但是应用程序崩溃了,我在LogCat中收到以下错误/异常:
03-13 18:36:29.190 4128-4128 / com.celik.abdullah.hefuxi11 E / AndroidRuntime:致命异常:main 流程:com.celik.abdullah.hefuxi11,PID:4128 java.lang.IllegalArgumentException:无法为rx.Observable创建调用适配器 用于方法CliqueDBApiInterface.getStatementsOfTheClique 在retrofit2.Utils.methodError(Utils.java:52) 在retrofit2.HttpServiceMethod.createCallAdapter(HttpServiceMethod.java:60) 在retrofit2.HttpServiceMethod.parseAnnotations(HttpServiceMethod.java:34) 在retrofit2.ServiceMethod.parseAnnotations(ServiceMethod.java:36) 在retrofit2.Retrofit.loadServiceMethod(Retrofit.java:168) 在retrofit2.Retrofit $ 1.invoke(Retrofit.java:147) 在java.lang.reflect.Proxy.invoke(Proxy.java:913) 位于$ Proxy1.getStatementsOfTheClique(未知来源) 在com.celik.abdullah.hefuxi11.adapters.CliqueAdapter $ 1.run(CliqueAdapter.java:124) 在android.os.Handler.handleCallback(Handler.java:790) 在android.os.Handler.dispatchMessage(Handler.java:99) 在android.os.Looper.loop(Looper.java:164) 在android.app.ActivityThread.main(ActivityThread.java:6494) 在java.lang.reflect.Method.invoke(本机方法) 在com.android.internal.os.RuntimeInit $ MethodAndArgsCaller.run(RuntimeInit.java:438) 在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807) 原因:java.lang.IllegalArgumentException:无法找到以下对象的调用适配器 rx。可观察。 尝试过: * retrofit2.adapter.rxjava2.RxJava2CallAdapterFactory * retrofit2.CompletableFutureCallAdapterFactory * retrofit2.ExecutorCallAdapterFactory 在retrofit2.Retrofit.nextCallAdapter(Retrofit.java:239) 在retrofit2.Retrofit.callAdapter(Retrofit.java:203) 在retrofit2.HttpServiceMethod.createCallAdapter(HttpServiceMethod.java:58) ...另外14个
有人知道如何解决该问题吗?我发现了有关此异常的其他一些SO问题,并通过播放/更改gradle文件中的导入包尝试了所有答案,但没有任何效果。构建改造实例时,我还添加了 addCallAdapterFactory(RxJava2CallAdapterFactory.create()),但出现了相同的错误。
谢谢,
答案 0 :(得分:2)
您正在使用RxJava 1.x的observable和订户。您已在.addCallAdapterFactory(RxJava2CallAdapterFactory.create())
您应该从RxJava 2.x导入
因此,您还需要更新依赖项
implementation 'io.reactivex.rxjava2:rxandroid:2.1.1'
implementation 'io.reactivex.rxjava2:rxjava:2.2.6'
implementation 'com.squareup.retrofit2:adapter-rxjava2:2.3.0'
import io.reactivex.Observable;
import io.reactivex.schedulers.Schedulers;
import io.reactivex.android.schedulers.AndroidSchedulers;
import io.reactivex.disposables.CompositeDisposable;
答案 1 :(得分:2)
是的,要么将所有内容都更新到RxJava2,要么可以使用RxJava1
在这种情况下,您的导入将类似于:
/* rx */
implementation 'io.reactivex:rxandroid:1.2.1'
implementation 'io.reactivex:rxjava:1.3.2'
/* retrofit, gson */
implementation 'com.squareup.retrofit2:retrofit:2.4.0'
implementation 'com.squareup.retrofit2:adapter-rxjava:2.3.0'
implementation 'com.squareup.retrofit2:converter-gson:2.4.0'
implementation 'com.squareup.okhttp3:logging-interceptor:3.8.1'
implementation 'com.squareup.retrofit2:converter-scalars:2.4.0'
然后您的RetrofitApiInterface将如下所示:
public static CliqueDBApiInterface getCliqueDBApiInterface(){
if(sCliqueDBApiInterface == null){
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(BASE_URL)
.addCallAdapterFactory(RxJavaCallAdapterFactory.create())
.addConverterFactory(GsonConverterFactory.create())
.client(okHttpClient)
.build();
sCliqueDBApiInterface = retrofit.create(CliqueDBApiInterface.class);
}
return sCliqueDBApiInterface;
}
where okHttpClient = new OkHttpClient.Builder().build();
答案 2 :(得分:0)
要立即创建一个呼叫,请使用flatMap operator而不是在Subscriber
方法中创建subscribe()
。