如何在Android中保存和读取tar.gz文件？

Question

我从服务器获取tar.gz文件。使用改造我使用Charles代理检查了响应。现在，如何将响应存储在内部存储中并读取文件内容？ tar.gz文件包含PNG文件。下面是我从服务器获得响应的代码片段。

OkHttpClient.Builder builder = new OkHttpClient.Builder();
    builder.connectTimeout(60, TimeUnit.SECONDS);

    Retrofit retrofit = new Retrofit.Builder()
            .client(builder.build())
            .addConverterFactory(GsonConverterFactory.create())
            .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
            .baseUrl("http://www.labox.com/")
            .build();

    HttpService downloadService = retrofit.create(HttpService.class);

    downloadService.downloadChannelLogoZipFile(URI)
            .flatMap(new Func1<Response<ResponseBody>, Observable<File>>() {
                @Override
                public Observable<File> call(final Response<ResponseBody> responseBodyResponse) {
                    return Observable.create(new Observable.OnSubscribe<File>() {
                        @Override
                        public void call(Subscriber<? super File> subscriber) {
                            try {
....}