Android listview與adapter用法(BaseAdapter + getView)

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); //獲得一個MyAdapter對象
        
        lv.setAdapter(mAdapter); //爲ListView綁定Adapter 
        /*爲ListView添加點擊事件*/ 
        lv.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                Log.v("BaseAdapterTest", "你點擊了ListView條目" + position);
            }
        });
        
    }
    
    /*添加一個獲得數據的方法，方便使用*/
    private ArrayList<HashMap<String, Object>> getData() {
        ArrayList<HashMap<String, Object>> listItem = new ArrayList<HashMap<String,Object>>();
        
        /*爲動態數組添加數據*/
        for (int i = 0; i < 30; i++) {
            HashMap<String, Object> map = new HashMap<String, Object>();
            map.put("ItemTitle", "第" + i + "行");
            map.put("ItemText", "這是第" + i + "行");
            listItem.add(map);
        }
        
        return listItem;
    }
    
    // 新建一個類繼承BaseAdapter，實現視圖與數據的綁定
    private class MyAdapter extends BaseAdapter {
        
        private LayoutInflater mInflater; //獲得一個LayoutInfalter對象用來導入佈局
        
        public MyAdapter(Context context) {
            this.mInflater = LayoutInflater.from(context);
        }
        
        @Override
        public int getCount() {
            return getData().size(); //返回數組的長度
        }        
        
        @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();
                /*獲得各個控件的對象*/
                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); //綁定ViewHolder對象
            }
            else {
                holder = (ViewHolder) convertView.getTag(); //取出ViewHolder對象
            }
            
            /*設置TextView顯示的內容，即咱們存放在動態數組中的數據*/
            holder.title.setText(getData().get(position).get("ItemTitle").toString());
            holder.text.setText(getData().get(position).get("ItemText").toString());
            /*爲Button添加點擊事件*/
            holder.bt.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    Log.v("BaseAdapterTest", "你點擊了按鈕" + position);
                    //打印Button的點擊信息
                }
            });
            
            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;
    }

}