CacheUtil.java 文件源码

@TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
private static HttpResponseCache installHttpResponseCache(final File cacheDir)
        throws IOException {
    HttpResponseCache cache = HttpResponseCache.getInstalled();
    if (cache == null) {
        final long maxSize = calculateDiskCacheSize(cacheDir);
        cache = HttpResponseCache.install(cacheDir, maxSize);
    }
    return cache;
}