Android listview与adapter用法(BaseAdapter + getView)

Android listview与adapter用法
http://www.cnblogs.com/zhengbeibei/archive/2013/05/14/3078805.html

package com.example.listviewtest;

import java.util.ArrayList;

import java.util.HashMap;

import android.app.Activity;

import android.content.Context;

import android.os.Bundle;

import android.util.Log;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.view.View.OnClickListener;

import android.widget.AdapterView;

import android.widget.BaseAdapter;

import android.widget.Button;

import android.widget.TextView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.ListView;

//import com.example.listviewtest.MyAdapter;

public class BaseAdapterTest extends Activity {

    private ListView lv;

    ArrayList<HashMap<String, Object>> listItem;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        // TODO Auto-generated method stub

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        lv = (ListView) findViewById(R.id.listview01);

        MyAdapter mAdapter = new MyAdapter(this); //得到一个MyAdapter对象

        lv.setAdapter(mAdapter); //为ListView绑定Adapter

        /*为ListView添加点击事件*/

        lv.setOnItemClickListener(new OnItemClickListener() {

            @Override

            public void onItemClick(AdapterView<?> parent, View view,

                    int position, long id) {

                Log.v("BaseAdapterTest", "你点击了ListView条目" + position);

            }

        });

    }

    /*添加一个得到数据的方法，方便使用*/

    private ArrayList<HashMap<String, Object>> getData() {

        ArrayList<HashMap<String, Object>> listItem = new ArrayList<HashMap<String,Object>>();

        /*为动态数组添加数据*/

        for (int i = 0; i < 30; i++) {

            HashMap<String, Object> map = new HashMap<String, Object>();

            map.put("ItemTitle", "第" + i + "行");

            map.put("ItemText", "这是第" + i + "行");

            listItem.add(map);

        }

        return listItem;

    }

    // 新建一个类继承BaseAdapter，实现视图与数据的绑定

    private class MyAdapter extends BaseAdapter {

        private LayoutInflater mInflater; //得到一个LayoutInfalter对象用来导入布局

        public MyAdapter(Context context) {

            this.mInflater = LayoutInflater.from(context);

        }

        @Override

        public int getCount() {

            return getData().size(); //返回数组的长度

        }

        @Override

        public View getView(final int position, View convertView, ViewGroup parent) {

            ViewHolder holder;

            Log.v("BaseAdapterTest", "getView " + position + " " + convertView);

            if (convertView == null) {

                convertView = mInflater.inflate(R.layout.listitem, null);

                holder = new ViewHolder();

                /*得到各个控件的对象*/

                holder.title = (TextView) convertView.findViewById(R.id.ItemTitle);

                holder.text = (TextView) convertView.findViewById(R.id.ItemText);

                holder.bt = (Button) convertView.findViewById(R.id.ItemButton); // to ItemButton

                convertView.setTag(holder); //绑定ViewHolder对象

            }

            else {

                holder = (ViewHolder) convertView.getTag(); //取出ViewHolder对象

            }

            /*设置TextView显示的内容，即我们存放在动态数组中的数据*/

            holder.title.setText(getData().get(position).get("ItemTitle").toString());

            holder.text.setText(getData().get(position).get("ItemText").toString());

            /*为Button添加点击事件*/

            holder.bt.setOnClickListener(new OnClickListener() {

                @Override

                public void onClick(View v) {

                    Log.v("BaseAdapterTest", "你点击了按钮" + position);

                    //打印Button的点击信息

                }

            });

            return convertView;

        }

        @Override

        public Object getItem(int position) {

            // TODO Auto-generated method stub

            return null;

        }

        @Override

        public long getItemId(int position) {

            // TODO Auto-generated method stub

            return 0;

        }

    }

    /*存放控件 的ViewHolder*/

    public final class ViewHolder {

        public TextView title;

        public TextView text;

        public Button bt;

    }

}