c# - 如何使用 WebView 在 Xamarin C# 应用程序中为 Android 设置代理？

Question

我有一个使用 Xamarin 在 C# 中创建的 Android 应用程序。

这本质上是一个具有一些附加功能的网络浏览器，现在我想添加一个选项来设置要使用的代理。在应用程序中，我使用 WebView 连接到网站。

我尝试从该主题(How can I set ProxySettings and ProxyProperties on Android Wi-Fi connection using Java?)中实现解决方案，但 WifiConfiguration 中没有 linkProperties。这是它的样子:

private static Java.Lang.Object getField(Java.Lang.Object obj, String name)
{
   Field f = obj.Class.GetField(name);
   Java.Lang.Object o = f.Get(obj);
   return o;
}

public void SetHttpProxy(string proxyServerAddress, int proxyServerInt)
{
   try
   {
       var wifiManager = context.GetSystemService(Context.WifiService) as WifiManager;
       if (!wifiManager.IsWifiEnabled)
           return;

       var configurationList = wifiManager.ConfiguredNetworks;

       var cur = wifiManager.ConnectionInfo.NetworkId;
       var configuration = configurationList.FirstOrDefault(conf => conf.NetworkId == cur);

       getField(configuration, "linkProperties");

   }
   catch (Exception e)
   {
       throw;
   }
}

Answer 1

这是适用于 4.、5.、6.* 和 7.* Android 操作系统版本的解决方案:

public static void SetProxy(WebView webView, string host, int port, bool bypass)
{
    Context appContext = webView.Context.ApplicationContext;
    JavaSystem.SetProperty("http.proxyHost", host);
    JavaSystem.SetProperty("http.proxyPort", port + "");
    JavaSystem.SetProperty("https.proxyHost", host);
    JavaSystem.SetProperty("https.proxyPort", port + "");
    if (bypass)
        JavaSystem.SetProperty("http.nonProxyHosts", BYPASS_PATTERN);

    try
    {
        Class applictionCls = Class.ForName(APPLICATION_CLASS_NAME);
        Field loadedApkField = applictionCls.GetField("mLoadedApk");
        loadedApkField.Accessible = true;
        Object loadedApk = loadedApkField.Get(appContext);
        Class loadedApkCls = Class.ForName("android.app.LoadedApk");
        Field receiversField = loadedApkCls.GetDeclaredField("mReceivers");
        receiversField.Accessible = true;
        ArrayMap receivers = (ArrayMap) receiversField.Get(loadedApk);
        foreach (Object receiverMap in receivers.Values())
        {
            foreach (Object rec in Extensions.JavaCast<ArrayMap>(receiverMap).KeySet())
            {
                Class clazz = rec.Class;
                if (clazz.Name.Contains("ProxyChangeListener"))
                {
                    Method onReceiveMethod = clazz.GetDeclaredMethod("onReceive", Class.FromType(typeof(Context)), Class.FromType(typeof(Intent)));
                    Intent intent = new Intent(Android.Net.Proxy.ProxyChangeAction);

                    onReceiveMethod.Invoke(rec, appContext, intent);
                }
            }
        }
    }
    catch (Exception)
    {
    }
}