android - 如何更新 OkHttp 缓存

Question

在我的 android 应用程序中，我使用 OkHttp 缓存来自服务器的响应。为此，我实现了如下代码

     private class CacheInterceptor implements Interceptor {

        Context mContext;

        public CacheInterceptor(Context context) {
            this.mContext = context;
        }

        @Override
        public Response intercept(Chain chain) throws IOException {
            Request request = chain.request();
                request = request.newBuilder()
                        .header(HEADER_MOBILE_OS, Constants.MOBILE_OS)
                        .header(HEADER_APP_VERSION, BuildConfig.VERSION_NAME)
                        .build();
            Response response = chain.proceed(request);

            if (!mShouldUpdateCache) {
                response.newBuilder()
                        .header("Cache-Control", String.format("max-age=%d", CACHE_MAX_AGE)).build();
            } else {
//update cache in this case
                response.newBuilder()
                        .header("Cache-Control", "no-cache").build();
                mShouldUpdateCache = false;
            }
            return response;
        }
    }

这是我的拦截器类，我将其设置为 OkClient，如下所示

okHttpClient.networkInterceptors().add(new CacheInterceptor(context));

    File httpCacheDirectory = new File(context.getCacheDir(), "response_cache");
    Cache cache = new Cache(httpCacheDirectory, CACHE_SIZE);

    if (cache != null) {
        okHttpClient.setCache(cache);
    }

但问题是，当布尔值mShouldUpdateCache变为真时，我必须更新缓存。现在我已经写了response.newBuilder().header("Cache-Control", "no-cache").build();，但它既没有更新缓存也没有从服务器获取，我该如何解决这个问题？

Answer 1