RxJava获取链式网络请求中前一个观察值的结果

Observable.just(requestData)
    .flatMap(new Function<RequestData, ObservableSource<ResponseData>>() {
        @Override
        public ObservableSource<ResponseData> apply(RequestData requestData) throws Exception {
            // 发起网络请求并获取结果
            return ApiClient.getInstance().getData(requestData);
        }
    })
    .map(new Function<ResponseData, Result>() {
        @Override
        public Result apply(ResponseData responseData) throws Exception {
            // 对前一个观察值的结果进行处理
            return processResponse(responseData);
        }
    })
    .subscribe(new Consumer<Result>() {
        @Override
        public void accept(Result result) throws Exception {
            // 处理最终的结果
            handleResult(result);
        }
    });