android - 从 android 上的改造方法返回 Callable

Question

这是我在 Retrofit 上的方法:

@GET("comments")
Callable<List<Comments>> getCommentsRx();

我已经为 Rxjava 创建了 Thread 类:

public static <T> Disposable async(Callable<List<T>> task, Consumer<List<T>> finished, Consumer<Throwable> onError) {
        return async(task, finished, onError, Schedulers.io());
    }

public static <T> Disposable async(Callable<List<T>> task, Consumer<List<T>> finished,
                                   Consumer<Throwable> onError, Scheduler scheduler) {
    finished = finished != null ? finished
            : (a) -> {
    };
    onError = onError != null ? onError
            : throwable -> {
    };

    return Single.fromCallable(task)
            .subscribeOn(scheduler)
            .observeOn(AndroidSchedulers.mainThread())
            .subscribe(finished, onError);
}

我有 loadjson 方法从网络获取数据:

private void loadJson(Consumer<List<Comments>> finished) {

    Threading.async(() -> fetchingServer(),finished,null);
}

private List<Comments> fetchingServer() {
    JsonplaceholderService service =
            ServiceGenerator.createService(JsonplaceholderService.class);

    try {
        return service.getCommentsRx().call();
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

但我在 fetchingServer 方法中出错。

java.lang.IllegalArgumentException: Unable to create call adapter for java.util.concurrent.Callable> for method JsonplaceholderService.getCommentsRx

Answer 1

Retrofit 没有用于Callable 的适配器，您不能在@GET 方法中使用它。

您可以使用:

1. RxJava2 Observable、Flowable、Single、Completable & Maybe,

2. Java 8 CompletableFuture

3. 改造调用

所以，你可以这样做:

@GET("comments")
Observable<List<Comments>> getCommentsRx(); //rx observable, not java.util.observable

在您的客户端中:

  service.getCommentsRx()
        .subscribeOn(scheduler)
        .observeOn(AndroidSchedulers.mainThread())
        .subscribe(finished, onError)