Cache.java 文件源码

public static Downloader createCacheDownloader(Context context) {
    try {
        Class.forName("com.squareup.okhttp.OkHttpClient");
        File cacheDir = createDefaultCacheDir(context, CACHE_PATH);
        long cacheSize = calculateDiskCacheSize(cacheDir);
        return new OkHttpDownloader(cacheDir, cacheSize);
    } catch (ClassNotFoundException e) {
        return new UrlConnectionDownloader(context);
    }
}