Main.axml

MainActivity.cs

using System;using System.IO;using System.Net;using Android.App;using Android.Content;using Android.Graphics.Drawables;using Android.Runtime;using Android.Views;using Android.Widget;using Android.OS;namespace LoadPic{    [Activity(Label = "LoadPic", MainLauncher = true)]    public class MainActivity : Activity    {        private ImageView showPic;        private string picPath = "http://www.kl.cc/images/about/tizi/jiangkun/inscription-jiangkun.jpg";        ProgressDialog msgbox;        protected override void OnCreate(Bundle bundle)        {            base.OnCreate(bundle);            SetContentView(Resource.Layout.Main);            showPic = FindViewById
     
      (Resource.Id.showPic);            msgbox = ProgressDialog.Show(this, "请稍等", "图片正在加载中...", true, true);                         HttpWebRequest req = WebRequest.Create(picPath) as HttpWebRequest;            req.Method = "Get";            req.GetResponseAsync().ContinueWith(o =>            {                                HttpWebResponse resp = (HttpWebResponse)o.Result;                                this.RunOnUiThread(() =>                {                    Drawable dr = new BitmapDrawable(resp.GetResponseStream());                    showPic.SetImageDrawable(dr);                    msgbox.Cancel();                });            });        }    }}