如何仅在设备在Volley中处于脱机状态时显示缓存

Question

我正在使用Volley，我想缓存响应（没有服务器控制缓存头）。

我想仅在没有互联网的情况下显示缓存值。

我尝试了什么：

private Entry getCachedEntry(NetworkResponse response) {
    // entry that will be passed to the response instance
    Entry cachedEntryForRequest = HttpHeaderParser
            .parseIgnoreCacheHeaders(response);

    // The request queue cache
    Cache cache = BaseApplication.getInstance().getRequestQueue()
            .getCache();

    // gets the cached entry for the request
    Entry cachedItems = cache.get(GetEvents.KEY_CACHE);

    if (NetworkChecker.isOnline(mContext)) {

        // puts the entry with the new data to the cache
        cache.put(GetEvents.KEY_CACHE, cachedEntryForRequest);

        // return null so the new data to be shown
        cachedEntryForRequest = null;
    } else {
        // show the cached data if the device is offline
        if (cachedItems != null) {
            cachedEntryForRequest.data = cachedItems.data;
        } else {
            cachedEntryForRequest = null;
        }
    }

    return cachedEntryForRequest;
}

    protected Response<T> parseNetworkResponse(NetworkResponse response) {
    try {
        String json = new String(response.data,
                HttpHeaderParser.parseCharset(response.headers));

        Log.v(TAG, "response: " + json);

        Object fromJson = mGson.fromJson(json, mType);

        return Response.success((T) fromJson, getCacheEntry(response));
    } catch (UnsupportedEncodingException e) {
        return Response.error(new ParseError(e));
    } catch (JsonSyntaxException e) {
        return Response.error(new ParseError(e));
    }
}

这是我自己的解决方案，但我做错了，因为即使设备在线，它也会显示缓存结果？！？！？