Activity调用静态方法改变UI,使用Handler来改变UI显示

本人菜鸟,请各位多多指点,不足之处,请斧正.没啥技术含量,就权当丰富下mono for android的小代码.

Activity调用静态方法改变UI

using System;

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

namespace AndroidApplication1
{
    [Activity(Label = "AndroidApplication1", MainLauncher = true, Icon = "@drawable/icon")]
    public class Activity1 : Activity
    {
        int count = 1;

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

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

            // Get our button from the layout resource,
            // and attach an event to it
            Button button = FindViewById<Button>(Resource.Id.MyButton);

            button.Click += delegate { Class1.fun("改变一下咯", button); };
        }
    }
}

使用Handler来改变UI显示

using System;
using System.Collections.Generic;
using System.Text;
using Android.App;
using Android.OS;
using Android.Widget;
namespace AndroidApplication1
{
    public static class Class1
    {
        public static void fun(string str, Button button)
        {
            Java.Lang.Runnable rb;
            Handler handler = new Handler();
            rb = new Java.Lang.Runnable(() =>
            {
                button.Text = str;
            });
            handler.PostDelayed(rb, 1000);
        }

    }
}

代码不对,请告诉我哦.