Question

我通过使用RxAndroid进行改造来调用api。这是方法的定义方式

@GET("product")
    Observable<BaseResponse<List<Product>>> getProducts(@Query("lang") String lang,
                                                        @Query("category_id") String category_id,
                                                        @Query("start") String start,
                                                        @Query("count") String count);

此api返回Product列表。我想处理列表中的每个Product对象，以检查该产品是否存在于本地db＆amp;在产品对象中设置布尔值。所以我这样做了，

public Observable<List<Product>> getProductList(String catId, int start, int count) {

        final List<Product> products = new ArrayList<>();
        return RestClient.callApiWrapper(mContext, true, null,
                RestClient.get().getProducts("en", catId, "" + start, "" + count))
                .subscribeOn(Schedulers.newThread())
                .observeOn(AndroidSchedulers.mainThread())
                .flatMapIterable(new Func1<BaseResponse<List<Product>>, Iterable<Product>>() {
                    @Override
                    public Iterable<Product> call(BaseResponse<List<Product>> listBaseResponse) {
                        Log.e("TAG", "flatMapIterable called");
                        return listBaseResponse.getData();
                    }
                })
                .map(new Func1<Product, List<Product>>() {
                    @Override
                    public List<Product> call(Product product) {
                        Log.e("TAG", "map called => " + products.size());
                        products.add(checkIfProductAddedToCart(product));
                        return products;
                    }
                });

    }

我订阅了getProductList，我需要以这种方式处理已处理的列表：

mProductListDataModel.getProductList(mCategoryId, mStartOffset, mCount)
                .subscribeOn(Schedulers.newThread())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Subscriber<List<Product>>() {
                    @Override
                    public void onCompleted() {

                    }

                    @Override
                    public void onError(Throwable e) {

                    }

                    @Override
                    public void onNext(List<Product> products) {
                        Log.e("TAG", "onNext => " + products.size());
                        if(mOnProductListLoaded != null)
                            mOnProductListLoaded.onProductListLoaded(products);
                    }
                });

现在问题是，API实际上返回了5个产品的列表，但onNext每次被调用5次，大小增加到40个产品。请让我知道我在哪里做错了。

Answer 1

我现在改变了一些东西，如下所示：

更改了getProductList以返回Product而不是List<Product> 所以它看起来像

public Observable<Product> getProductList(String catId, int start, int count) {

        //final List<Product> products = new ArrayList<>();
        return RestClient.callApiWrapper(mContext, true, null,
                RestClient.get().getProducts("en", catId, "" + start, "" + count))
                .subscribeOn(Schedulers.newThread())
                .observeOn(AndroidSchedulers.mainThread())
                .flatMap(new Func1<BaseResponse<List<Product>>, Observable<Product>>() {
                    @Override
                    public Observable<Product> call(BaseResponse<List<Product>> listBaseResponse) {
                        return Observable.from(listBaseResponse.getData());
                    }
                })
                .map(new Func1<Product, Product>() {
                    @Override
                    public Product call(Product product) {
                        //Log.e("TAG", "map called => " + products.size());
                        //products.add(checkIfProductAddedToCart(product));
                        //return products;
                        return checkIfProductAddedToCart(product);
                    }
                });
    }

并更改了此可观察者订阅的位置：

final List<Product> products = new ArrayList<>();
    mProductListDataModel.getProductList(mCategoryId, mStartOffset, mCount)
                    .subscribeOn(Schedulers.newThread())
                    .observeOn(AndroidSchedulers.mainThread())
                    .subscribe(new Subscriber<Product>() {
                        @Override
                        public void onCompleted() {
                            Log.e("TAG", "onCompleted => " + products.size());
                            if (mOnProductListLoaded != null)
                                mOnProductListLoaded.onProductListLoaded(products);
                        }

                        @Override
                        public void onError(Throwable e) {

                        }

                        @Override
                        public void onNext(Product product) {
                            products.add(product);
                        }
                    });

但是，我仍然不确定这是否是正确的做法。如果这不是正确的方法，请告诉我。

RxAndroid onNext被多次调用

1 个答案: