[Activity(Label = "Main", MainLauncher = true, Icon = "@drawable/icon")]
     public class MainActivity : Activity,IGongAnView,View.IOnClickListener
     {
         TextView txt_result;
         Button btn_search;
         EditText btn_sitedomain;
         
         protected override void OnCreate(Bundle bundle)
         {
             base.OnCreate(bundle);
             SetContentView(Resource.Layout.Main);
             txt_result = FindViewById<TextView>(Resource.Id.txt_result);
             btn_search = FindViewById<Button>(Resource.Id.btn_search);
             btn_sitedomain = FindViewById<EditText>(Resource.Id.btn_sitedomain); 
             btn_search.SetOnClickListener(this);
         }
 
         public void OnClick(View v)
         {
             if (v.Id == Resource.Id.btn_search)
             {
                 string sitedomain = btn_sitedomain.Text;
                 string pattern = @"^[a-zA-Z0-9][-a-zA-Z0-9]{0,62}(\.[a-zA-Z0-9][-a-zA-Z0-9]{0,62})+$";
                 Regex reg = new Regex(pattern);
                 if (string.IsNullOrEmpty(sitedomain))
                 {
                     Toast.MakeText(this, "请输入域名", ToastLength.Short).Show();
                 }
                 else if (reg.IsMatch(sitedomain))
                 {
                     progressDialog.Show();
                     presenter.showResult(sitedomain);
                 }
                 else
                 {
                     Toast.MakeText(this, "域名错误，请重新输入", ToastLength.Short).Show();
                 }
             }
         }
       
     }