Xamarin(vs2015) Android控件 WebView加载网页

axml代码:

xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:minWidth="25px"
    android:minHeight="25px">
    <WebView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/webView1" />
LinearLayout>

Activity代码:

[Activity(Label = "App6", MainLauncher = true, Icon = "@drawable/icon")]
public class MainActivity : Activity
{
    int count = 1;
    Android.Webkit.WebView webview;
    protected override void OnCreate(Bundle bundle)
    {
        base.OnCreate(bundle);
        //隐藏标题栏(须放在SetContentView函数之前)
        this.RequestWindowFeature(WindowFeatures.NoTitle);
        //设置全屏
        this.Window.SetFlags(WindowManagerFlags.Fullscreen, WindowManagerFlags.Fullscreen);
        // Set our view from the "main" layout resource
        SetContentView(Resource.Layout.Main);

        //需引用using Android.Webkit;命名空间
        //使用默认的浏览器打开网页
        // Android.Webkit.WebView webview = new Android.Webkit.WebView(this);
        // webview.LoadUrl("http://www.baidu.com");

        //使用WebView控件打开指定网页
        Android.Webkit.WebView webview2 = FindViewById(Resource.Id.webView1);
        this.webview = webview2;
          webview2.LoadUrl("http://www.5525.org/");
        //加载项目中本地文件夹Assets下的test.html文件
        // webview2.LoadUrl("file:///android_asset/test.html");
        // webview2.LoadUrl("file:///android_asset/abc/test.html");
        //启用脚本
        webview2.Settings.JavaScriptEnabled = true;

        #region --缩放--
        //设置支持缩放(前提是网页自身支持缩放)
        webview2.Settings.SetSupportZoom(true);
        webview2.Settings.BuiltInZoomControls = true;

        //支持任意比例缩放
        webview2.Settings.UseWideViewPort = true;
        //显示缩放控件(放大/缩小按钮)
        webview2.Settings.DisplayZoomControls = false;

        //自适应屏幕
        //  webview2.Settings.SetLayoutAlgorithm(WebSettings.LayoutAlgorithm.SingleColumn);
        //webview2.Settings.LoadWithOverviewMode = true;
        #endregion

        //webview2.ClearCache(true);
        //后退
        //webview2.GoBack();
        webview2.SetWebViewClient(new ExtWebViewClient());

    }
    public override bool OnKeyDown([GeneratedEnum] Keycode keyCode, KeyEvent e)
    {
        //当按下后退键时，返回WebView上一页面，而不是结束
        if (keyCode == Keycode.Back && webview.CanGoBack())
        {
            webview.GoBack();
            return true;
        }
        //else
        //{
        //    return false;
        //}
        //默认
        return base.OnKeyDown(keyCode, e);
    }
}
public class ExtWebViewClient : Android.Webkit.WebViewClient
{
    ///
    /// 响应超链接事件，通过改变Load加载方式，
    /// 使在WebView控件中的连接在当前视图中打开，而不是新窗口中打开
    ///
    ///
    ///
    ///
    public override bool ShouldOverrideUrlLoading(WebView view, string url)
    {
        //默认
        //return base.ShouldOverrideUrlLoading(view, url);
        view.LoadUrl(url);
        return true;
    }
}