我有它加载的URL从网站的应用程序。现在，我想，该应用程序在离线时使用缓存。但我只是得到了失败的页面，该页面表示，即时通讯没有连接到该网站。起初我设置CacheMode参数为Load_Normal但这并没有帮助。接下来，我尝试了真的傻使用ConnectivityManager方式：

I have an application which loads urls from a website. Now I want that the application to use the cache when offline. But I just get the failure page which says that im not connected to the website. At first I set the Cachemode to Load_Normal but this doesn't help. Next I tried a realy "silly" approach using the ConnectivityManager:

cm = (ConnectivityManager) this.getSystemService(Activity.CONNECTIVITY_SERVICE);
if(cm.getActiveNetworkInfo().isConnected()){
  mfnWebView.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT);
  mfnWebView.loadUrl(url);
}
else{
  mfnWebView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
  mfnWebView.loadUrl(url);
}

但这只是导致崩溃的应用程序。

but this just leads to crashing the application.

有没有一种简单的方式来加载时，离线和现有的，只是不存在则显示失败消息的缓存。

Is there a simple way to load the cache when offline and existing and just if not existing showing the failure message.

推荐答案

确定。在code以上的罚款。需要被添加的许可是：

OK. The code is fine above. The permission needed to be added are:

。互联网

.ACCESS_NETWORK_STATE

.ACCESS_NETWORK_STATE

.ACCESS_WIFI_STATE

.ACCESS_WIFI_STATE