如何为OkHttp客户端设置应用程序级缓存目录

Question

我正在使用Retrofit - OkHttp 进行网络服务调用。 使用OkHttp的OkHttpClient.Builder获取OkHttpClient时， 缓存有参数。

见下面一行：

OkHttpClient.Builder builder = new OkHttpClient.Builder()
            .cache(?);// This last parameter

如何设置此缓存参数？

Answer 1

使用以下代码，我们可以为 OkHttpClient 设置应用程序级缓存目录：

// Install an HTTP cache in the application cache directory.

    File cacheDir = new File(app.getCacheDir(), "http");
    // [app] is your Application class object.
    // using [app.getCacheDir()], get app cache directory.

    Cache cache = new Cache(cacheDir, DISK_CACHE_SIZE);
    //DISK_CACHE_SIZE is constant for OkHttpClient cache directory size.    
   //private int DISK_CACHE_SIZE = 50 * 1024 * 1024; // 50MB


    OkHttpClient.Builder builder = new OkHttpClient.Builder()
            .cache(cache);

    OkHttpClient okHttpClient=builder.build();