mono for android 读取网络远程图片

布局

<?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"
    >
  <Button
  android:id="@+id/btn"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="查看" />
  <ImageButton
  android:id="@+id/imageView"
  android:layout_width="fill_parent"
  android:layout_height="200px" />
</LinearLayout>

C#代码

        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            // Set our view from the "main" layout resource
            SetContentView(Resource.Layout.Main);

            Button btn = FindViewById<Button>(Resource.Id.btn);
           
            btn.Click += new EventHandler(btn_Click);
            
            
        }

        void btn_Click(object sender, EventArgs e)
        {
            ImageView imgview = FindViewById<ImageView>(Resource.Id.imageView);
            imgview.SetImageBitmap(getImage("http://hiphotos.baidu.com/baidu/pic/item/7d8aebfebf3f9e125c6008d8.jpg"));
        }

        public static Bitmap getImage(string imagepath) {
            
            URL url=null;
            Bitmap bitmap = null;
            try
            {
                url = new URL(imagepath);
            }
            catch (Exception e)
            {

            } 

            HttpURLConnection conn = (HttpURLConnection)url.OpenConnection();
            conn.DoInput = true;
            conn.Connect();
            System.IO.Stream str = conn.InputStream;
            bitmap = BitmapFactory.DecodeStream(str);
            str.Close();

            return bitmap;
        }