Android控件 WebView加载网页

添加控件

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

方法二、Activity代码:

using System;
using Android.App;
using Android.Content;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;
using Android.Webkit;

namespace App1
{
    [Activity(Label = "百姓市场", MainLauncher = true, Icon = "@drawable/icon1")]
    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);

            Android.Webkit.WebView webview2 = FindViewById<Android.Webkit.WebView>(Resource.Id.webView1);
            this.webview = webview2;
            webview2.LoadUrl("http://www.bxsc.net");
            //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();  

            //设置Web视图  
            webview2.SetWebViewClient(new ExtWebViewClient());

        }

        int sftc = 0;
        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
            {
                if(sftc == 0)
                {
                    Toast.MakeText(this, "在按一次退出程序", ToastLength.Long).Show();
                    sftc++;
                    if(sftc > 1)
                    {
                        return base.OnKeyDown(keyCode, e);
                    }

                    System.Timers.Timer timer = new System.Timers.Timer();
                    timer.Enabled = true;
                    timer.Interval = 3000;//执行间隔时间,单位为毫秒  
                    timer.Start();
                    timer.Elapsed += new System.Timers.ElapsedEventHandler(Timer1_Elapsed);

                    return false;
                }
                else
                {
                    return base.OnKeyDown(keyCode, e);
                }
            }
        }

        private void Timer1_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            sftc = 0;
        }

    }

    public class ExtWebViewClient : Android.Webkit.WebViewClient
    {
        /// <summary>  
        /// 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  
        /// </summary>  
        /// <param name="view"></param>  
        /// <param name="url"></param>  
        /// <returns></returns>  
        public override bool ShouldOverrideUrlLoading(WebView view, string url)
        {
            //默认  
            //return base.ShouldOverrideUrlLoading(view, url);  
            view.LoadUrl(url);
            return true;
        }
    }
}