Retrofit缓存

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 public static OkHttpClient genericClient() {        if (client != null) {            return client;        }        //缓存路径        File cacheFile = new File(App.getContext().getCacheDir(), "HttpCache");        Cache cache = new Cache(cacheFile, 1024 * 1024 * 10);//缓存文件为10MB        Interceptor interceptor = new Interceptor() {            @Override            public okhttp3.Response intercept(Chain chain) throws IOException {                int maxAge = 60 * 60; // 有网络时 设置缓存超时时间1个小时                int maxStale = 60 * 60 * 24 * 28; // 无网络时，设置超时为4周                Request request = chain.request();                if (isNetworkReachable(App.getContext())) {                    request = request.newBuilder()                            .cacheControl(CacheControl.FORCE_NETWORK)//有网络时只从网络获取                            .build();                } else {                    request = request.newBuilder()                            .cacheControl(CacheControl.FORCE_CACHE)//无网络时只从缓存中读取                            .build();                }                okhttp3.Response response = chain.proceed(request);                if (isNetworkReachable(App.getContext())) {                    response = response.newBuilder()                            .removeHeader("Pragma")                            .header("Cache-Control", "public, max-age=" + maxAge)                            .build();                } else {                    response = response.newBuilder()                            .removeHeader("Pragma")                            .header("Cache-Control", "public, only-if-cached, max-stale=" + maxStale)                            .build();                }                return response;            }        };        client = new OkHttpClient.Builder()                .addNetworkInterceptor(interceptor)                .connectTimeout(10 * 1000, TimeUnit.SECONDS)                .cache(cache)                .build();        return client;    }

网络判断需添加权限

  <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

public static Boolean isNetworkReachable(Context context) {        ConnectivityManager cm = (ConnectivityManager) context                .getSystemService(Context.CONNECTIVITY_SERVICE);        NetworkInfo current = cm.getActiveNetworkInfo();        if (current == null) {            return false;        }        return (current.isAvailable());    }

Get请求可将其缓存,JSONConverterFactory是自定义的转换

   Retrofit.Builder builder = new Retrofit.Builder()                .client(genericClient())                .baseUrl(baseUrl)                .addConverterFactory(new JSONConverterFactory());

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