Retrofit添加缓存

public void init(Context context) {

//指定缓存路径

String directoryPath = context.getCacheDir().getAbsolutePath() + "/responses";

File directory = new File(directoryPath);

OkHttpClient okHttpClient = new OkHttpClient.Builder()

.cache(new Cache(directory, DEFAULT_CACHE_SIZE))//指定缓存目录和大小

.addNetworkInterceptor(REWRITE_CACHE_CONTROL_INTERCEPTOR)//网络拦截器

.build();

Retrofit retrofit = new Retrofit.Builder()

.baseUrl(Constant.HOST)

.client(okHttpClient)

.addConverterFactory(GsonConverterFactory.create(gson))

.build();

mApi = retrofit.create(Api.class);

}

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初始化

public class GooglePlayApplication extends Application {

@Override

public void onCreate() {

super.onCreate();

NetworkManager.init(getApplicationContext());

}

}

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重写网络响应的Cache-Control

如果服务器在网络响应头里配置了Cache-Contorol，那么其实客户端是不需要做任何事情就能使用缓存的，但如果服务器没有配置，我们可以拦截这个网络响应，加入我们自己的配置。

/**

* Dangerous interceptor that rewrites the server's cache-control header.

*/

private static final Interceptor REWRITE_CACHE_CONTROL_INTERCEPTOR = new Interceptor() {

@Override

public Response intercept(Interceptor.Chain chain) throws IOException {

Response originalResponse = chain.proceed(chain.request());

//设置5分钟后缓存过期

CacheControl.Builder builder = new CacheControl.Builder().maxAge(5, TimeUnit.MINUTES);

return originalResponse.newBuilder()

.header(CACHE_CONTROL, builder.build().toString())

.build();

}

};