mono for android Listview 里面按钮 view Button click 注册方法 并且传值给其他Activity 主要是context

需求：为Listview的Item里面的按钮Button添加一个事件，单击按钮时通过事件传值并跳转到新的页面。

环境：mono

效果：

 

 布局代码

   主布局

<?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">
    <ListView
        android:id="@+id/myList"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />
</LinearLayout>

Item布局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:padding="10dp"
              >

  <TextView
    android:id="@+id/txt"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    />

  <Button
    android:id="@+id/btn"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentRight="true"
    />
</RelativeLayout>

 MainActivity

using System;

using Android.App;
using Android.Content;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;
using System.Collections.Generic;

namespace ListViewItemBtnClick
{
    [Activity(Label = "ListViewItemBtnClick", MainLauncher = true, Icon = "@drawable/icon")]
    public class Activity1 : Activity
    {
        ListView listView;

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

            SetContentView(Resource.Layout.Main);


            listView = FindViewById<ListView>(Resource.Id.myList);

         
            //填充Listview
            getList(listView);



        }
        
        //获取Listview
        private void getList(ListView listview)
        {

            Adapter goodsAdapter = new Adapter(this);
            List<Item> itemList = new List<Item>();
            Item item = new Item();

            //给Item赋值 并且添加到list里面
            for (int i = 0; i <10; i++)
            {
                item.title = i + "|标题|";
                item.button = i + "btn";
                itemList.Add(item);
            }
            //给adapter中添加list的值
            foreach (Item item1 in itemList)
            {
                goodsAdapter.Add(item1);
            }
            //将adapter的值付给listview
            listview.Adapter = goodsAdapter;
        }

    }
}

Item类

    class Item
    {
        //标题 textview
        public string title { get; set; }
        //按钮
        public string button { get; set; }
    }

Adapter配置数据

namespace ListViewItemBtnClick
{
    class Adapter:ArrayAdapter<Item>,View.IOnClickListener
    {

        private Context context;

        public Adapter(Context context):base(context,0){
            //通过构造函数获取context
            this.context = context;
        
        }
         




        public override View GetView(int position, View convertView, ViewGroup parent)
        {
            View view;
            //如果convertView不为空则直接使用
            if (convertView!=null)
            {
                view = convertView;

            }

            else
            {
                view = LayoutInflater.From(this.Context).Inflate(Resource.Layout.ListItem, null);

            }

            //设置title的值
            TextView title = view.FindViewById<TextView>(Resource.Id.txt);
            Button btn = view.FindViewById<Button>(Resource.Id.btn);

            Item item = GetItem(position);

            title.Text = item.title + position;
            //给每个按钮添加一个tag tag的值为position 或者自定义的ID
            btn.SetTag(Resource.Id.btn,position);
            btn.Text ="--"+ position+"---";
            //注册事件
            btn.SetOnClickListener(this);
            return view;
        }

        

        public void OnClick(View v)
        {
            //获得点击的按钮
            Button btn = v as Button;
            //获得tag
            int id =  Convert.ToInt32(btn.GetTag(btn.Id));

            Intent it = new Android.Content.Intent();

            it.SetClass(context,typeof(Activity2));
            it.PutExtra("pos", id);
            //注意！启动新Activity
            context.StartActivity(it);
        }
    }
}

在其他地方显示数据

 string PosValue = Intent.GetStringExtra("pos");
            

            Toast.MakeText(this, PosValue.ToString(), ToastLength.Long).Show();

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