在 Android Webview 中离线时加载缓存 [英] Loading Cache when Offline in Android Webview

问题描述

我有一个从网站加载网址的应用程序.现在我希望应用程序在离线时使用缓存.但我只是得到失败页面，上面说我没有连接到网站.起初我将 Cachemode 设置为 Load_Normal 但这没有帮助.接下来我尝试了一个真正的傻"使用 ConnectivityManager 的方法:

I have an application which loads urls from a website. Now I want 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);
}

但这只会导致应用程序崩溃.

but this just leads to crashing the application.

是否有一种简单的方法可以在离线和存在时加载缓存，如果不存在则显示失败消息.

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

好的.上面的代码没问题.需要添加的权限是:

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

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