由网友(承蒙时光不弃)分享简介：在我的Andr​​oid客户端我收到此JSON数据从后端：In my Android client I receive this JSON data from a backend:[[1427378400000,553],[1427382000000,553]]下面是实际加载数据的程序。我使用 RxAndroid...

在我的Andr​​oid客户端我收到此JSON数据从后端：

In my Android client I receive this JSON data from a backend:

[
    [
        1427378400000,
        553
    ],
    [
        1427382000000,
        553
    ]
]

下面是实际加载数据的程序。我使用 RxAndroid 和的改造这里。

Here is the routine which actually loads the data. I am using RxAndroid and Retrofit here.

private void getProductLevels() {
    Observable<List<List<Double>>> responseObservable =
        mProductService.readProductLevels();
    AppObservable.bindFragment(this, responseObservable)
        .subscribeOn(Schedulers.io())
        .observeOn(AndroidSchedulers.mainThread())
        // TODO: Transform List<List<Double>> into List<ProductLevel>
        .subscribe(new Subscriber<List<List<Double>>>() {
            @Override
            public void onCompleted() {}

            @Override
            public void onError(Throwable e) {}

            @Override
            public void onNext(List<List<Double>> response) {}
        });

}

我该如何映射内名单，其中，双＆GT; 到一个特定的Java类，如 ProductLevel 使用的 RxJava运营商

How can I map the inner List<Double> to a specific Java class such as ProductLevel using RxJava operators?

public class ProductLevel {

    public Double mTimeStamp;
    public Double mLevel;

    public ProductLevel(Double timeStamp, Double level) {
        mTimeStamp = timeStamp;
        mLevel = level;
    }

}

最后，我希望收到这样：名单，其中，ProductLevel＆GT;

推荐答案

根据您的资料，您会收到对（时间戳，级别）的列表。这对被重新presented由只包含两个值的列表。

According to your Data, you receive a list of pair (timestamp, level). This pair is represented by a list which contains only 2 values.

所以，你要为 EMIT 每一对，和转换每对成 ProductLevel 。

So you want to emit each pair, and transform each pair into a ProductLevel.

要做到这一点，你必须 flatMap 您对列表发出的一对。然后到地图每对成 ProductLevel 。最后，只是建立一个列表所有emited项目。

To do this, you'll have to flatMap your list of pair to emit each pair. Then to map each pair into a ProductLevel. Finally, just build a list with all emited items.

（java8风格）

AppObservable.bindFragment(this, responseObservable)
             .subscribeOn(Schedulers.io())
             .observeOn(AndroidSchedulers.mainThread())
             .flatMapIterable(listOfList -> listOfList) // or flatMap(l -> Observable.from(l))
             .map(pair -> new ProductLevel(pair.get(0),pair.get(1))) // build ProductLevel for each pair
             .toList() // build a list with all ProductLevel
             .subscribe(listOfProductLevel -> /** ... **/);