RxJava应用实例

在Http请求中，请求的结构一般包括：请求头 Header , 请求体 Body，正式请求类型，请求结果处理，如果我们需要将这三部分分开解耦，做到链式编程，那么我们应该怎么实现了 ？

1：请求头实现

  之间通过：Observable.create(new ObservableOnSubscribe()),  构造请求头。

protected Observable<Map<String, String>> getHeaders() {
        Observable<Map<String, String>> observable = Observable.create(new ObservableOnSubscribe<Map<String, String>>() {
            @Override
            public void subscribe(ObservableEmitter<Map<String, String>> e) throws Exception {
                if (mIUserAccountService != null) {
                    try {
                        String accessToken, idpUserId;
                        if (mIUserAccountService.getCurrentLoginStatus()) {
                            accessToken = mIUserAccountService.getInnerUserAccessToken();
                            idpUserId = mIUserAccountService.getCurrentIdpUserId();
                        } else {
                            accessToken = mIUserAccountService.getInnerAdminAccessToken();
                            idpUserId = StateConstant.HTTPHeaders.IDP_USER_VALUE;
                        }
                        mHeaders = new HashMap<>();
                        mHeaders.put(StateConstant.HTTPHeaders.ACCESS_TOKEN, accessToken);
                        mHeaders.put(StateConstant.HTTPHeaders.USER_ID, idpUserId);
                        LogUtil.i("wallpaper accessToken: ", accessToken, " idpUserId: ", idpUserId);
                    } catch (Exception e1) {
                        e1.printStackTrace();
                    }
                }
                e.onNext(mHeaders);
                e.onComplete();
            }
        });
        return observable;

2：请求body组装 ,正式请求类型 

Map<String, Object> params = new HashMap<>();
params.put(StateConstant.HTTPParams.VIN, getVin());

getHeaders().flatMap(new Function<Map<String, String>, ObservableSource<BaseWallpaperBean>>() {
                    @Override
                    public ObservableSource<BaseWallpaperBean> apply(Map<String, String> stringMap) throws Exception {
                        // http://{host}/apigateway/getThemeDafaultWallPaper 关联主题和壁纸
                        return mWallpaperSettingModel.getThemeAccociationWallpaper(mHeaders, convertParams(params));
                    }
                })

3：处理请求结果

.subscribe(new Consumer<BaseWallpaperBean>() {
                    @Override
                    public void accept(BaseWallpaperBean baseWallPaperBean) throws Exception {
                        LogUtil.i("theme association wallpaper: ", JSONUtil.toJson(baseWallPaperBean));
                        // TODO 待 后台IT 给出 title说明
                    }
                }, new Consumer<Throwable>() {
                    @Override
                    public void accept(Throwable throwable) throws Exception {
                        throwable.printStackTrace();
                    }
                });

完整代码