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问题是我可以使用 anObserver但我不能使用SingleObserver. 它给了我这个错误:

Inferred type 'E' for type parameter 'E' is not within its bound; should implement 'io.reactivex.rxjava3.core.Observer<? super com.xxx.Network.Response.ResponseLogin>'

.subscribeWith(new SingleObserver<ResponseLogin>(){
                ^
  required: E
  found: <anonymous SingleObserver<ResponseLogin>>
  reason: inferred type does not conform to upper bound(s)
    inferred: <anonymous SingleObserver<ResponseLogin>>
    upper bound(s): Observer<? super ResponseLogin>
  where E,T are type-variables:
    E extends Observer<? super ResponseLogin> declared in method <E>subscribeWith(E)
    T extends Object declared in class Observable

以下是一些实现细节:

//build.gradle
    implementation "io.reactivex.rxjava3:rxandroid:3.0.0"
    implementation "io.reactivex.rxjava3:rxjava:3.0.2"
//ApiInterface.java
import io.reactivex.rxjava3.core.Observable;
...
public interface ServerAPIInterface {
    // For POST request
    @FormUrlEncoded
    @POST("/login")
    public Observable<ResponseLogin> login(
        // the POST params to server
        @Field("user_email") String user_email,
        @Field("user_password") String user_password
    );

故障在于:

import io.reactivex.rxjava3.android.schedulers.AndroidSchedulers;
import io.reactivex.rxjava3.core.Observer;
import io.reactivex.rxjava3.core.SingleObserver;
import io.reactivex.rxjava3.disposables.CompositeDisposable;
import io.reactivex.rxjava3.disposables.Disposable;
import io.reactivex.rxjava3.schedulers.Schedulers;
...
        myApiInterface
                .login(myUserEmail, myPassword)
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribeWith(new SingleObserver<ResponseLogin>() {
                    @Override
                    public void onSuccess(ResponseLogin data) {
                        // update the adapter
                    }


                    @Override
                    public void onSubscribe(Disposable d) {
                        disposables.add(d);
                    }

                    @Override
                    public void onError(Throwable e) {
                        // display an error message
                    }
                });

如果我替换SingleObserverObserver( 并实现它编译好的所有必需的onXXX()方法。但我想要一个观察者。

我应该降级到 rxjava2(未经测试)吗?

我怀疑我的进口产品很混乱。

似乎有 2 个SingleObserver,另一个在io.reactivex.SingleObserver.

我确实尝试使用这些导入并跳过了rxjava3大多数的前缀。不过AndroidSchedulers只能在io.reactivex.rxjava3.android.schedulers.AndroidSchedulers.

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