Retrofit Offline Request And Response

I've already read many questions and answers about my issue, but I slill can't understand how to solve it. I need to fetch response from server and store it in cache. After that wh

Solution 1:

Solved.

The trick is in combining Interceptor and NetworkInterceptor.

Steps:

1)Separate REWRITE_CACHE_CONTROL_INTERCEPTOR for two Interceptors, one for online work and other for offline work:

InterceptorOFFLINE_INTERCEPTOR=newInterceptor() {
            @Overridepublic okhttp3.Response intercept(Chain chain)throws IOException {
                Requestrequest= chain.request();
                if (!isOnline()) {
                    intmaxStale=60 * 60 * 24 * 28; // tolerate 4-weeks stale
                    request = request.newBuilder()
                            .header("Cache-Control", "public, only-if-cached, max-stale=" + maxStale)
                            .build();
                }

                return chain.proceed(request);
            }
        };


InterceptorONLINE_INTERCEPTOR=newInterceptor() {
            @Overridepublic okhttp3.Response intercept(Chain chain)throws IOException {
                okhttp3.Responseresponse= chain.proceed(chain.request());
                 intmaxAge=60; // read from cachereturn response.newBuilder()
                         .header("Cache-Control", "public, max-age=" + maxAge)
                        .build();
            }
        };

2)Add Interceptors to okHttpClient

OkHttpClientokHttpClient=newOkHttpClient.Builder()
            .addInterceptor(httpLoggingInterceptor)
            //.addNetworkInterceptor(REWRITE_CACHE_CONTROL_INTERCEPTOR)
            .addInterceptor(OFFLINE_INTERCEPTOR)
            .addNetworkInterceptor(ONLINE_INTERCEPTOR)
            .cache(provideOkHttpCache())
            .build();

Link to original article