ListView简单用法

package com.cn.listview;  
 
import java.util.ArrayList;  
import java.util.HashMap;  
import java.util.List;  
import java.util.Map;  
 
import android.app.AlertDialog;  
import android.app.ListActivity;  
import android.content.Context;  
import android.content.DialogInterface;  
import android.os.Bundle;  
import android.view.LayoutInflater;  
import android.view.View;  
import android.view.View.OnClickListener;  
import android.view.ViewGroup;  
import android.widget.*;  
 
public class ListView04 extends ListActivity {  
    private List<Map<String,Object>> mData;  
    @Override 
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        mData=getData();  
        MyAdapter mAdapter=new MyAdapter(this);  
        setListAdapter(mAdapter);  
    }  
      
      
    private List<Map<String,Object>> getData(){  
        List<Map<String,Object>> list=new ArrayList<Map<String,Object>>();  
        Map<String,Object> map=new HashMap<String,Object>();  
        map.put("title", "title01");  
        map.put("info", "info01");  
        map.put("img", R.drawable.icon);  
        list.add(map);  
        map=new HashMap<String,Object>();  
        map.put("title", "title02");  
        map.put("info", "info02");  
        map.put("img", R.drawable.icon);  
        list.add(map);  
        return list;  
    }  
      
    public void showInfo(){  
        new AlertDialog.Builder(this)  
        .setTitle("myListView")  
        .setMessage("instruction")  
        .setPositiveButton("OK", new DialogInterface.OnClickListener() {  
              
            @Override 
            public void onClick(DialogInterface arg0, int arg1) {  
                  
            }  
        }).show();  
    }  
      
    public final class ViewHolder{  
        public ImageView img;  
        public TextView title;  
        public TextView info;  
        public Button viewBtn;  
    }  
      
    public class MyAdapter extends BaseAdapter{  
        private LayoutInflater mflater;  
        public MyAdapter(Context mContext){  
            this.mflater=LayoutInflater.from(mContext);  
        }  
        @Override 
        public int getCount() {  
            // TODO Auto-generated method stub  
            return mData.size();  
        }  
 
        @Override 
        public Object getItem(int arg0) {  
            return null;  
        }  
 
        @Override 
        public long getItemId(int arg0) {  
            return 0;  
        }  
 
        @Override 
        public View getView(int arg0, View arg1, ViewGroup arg2) {  
            ViewHolder holder=null;  
            if (arg1==null) {  
                holder=new ViewHolder();  
                arg1=mflater.inflate(R.layout.main, null);  
                holder.img=(ImageView)arg1.findViewById(R.id.img);  
                holder.title=(TextView)arg1.findViewById(R.id.title);  
                holder.info=(TextView)arg1.findViewById(R.id.info);  
                holder.viewBtn=(Button)arg1.findViewById(R.id.btn);  
                arg1.setTag(holder);  
            }else{  
                holder=(ViewHolder)arg1.getTag();  
            }  
            holder.img.setBackgroundResource((Integer)mData.get(arg0).get("img"));  
            holder.title.setText((String)mData.get(arg0).get("title"));  
            holder.info.setText((String)mData.get(arg0).get("info"));  
            holder.viewBtn.setOnClickListener(new btn_click());  
            return arg1;  
        }  
          
        class btn_click implements OnClickListener{  
 
            @Override 
            public void onClick(View arg0) {  
                // TODO Auto-generated method stub  
                showInfo();  
            }  
              
        }  
          
    }  
} 
<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="horizontal" android:layout_width="fill_parent" 
    android:layout_height="fill_parent"> 
    <ImageView android:id="@+id/img" android:layout_width="45px" 
        android:layout_height="45px" /> 
    <TableLayout android:layout_width="fill_parent" 
        android:layout_height="fill_parent" android:stretchColumns="0"> 
        <TableRow> 
            <LinearLayout android:orientation="vertical" 
                android:layout_width="fill_parent" android:layout_height="fill_parent" 
                android:gravity="left"> 
                <TextView android:textSize="16px" android:textColor="#ffffff" 
                    android:layout_width="wrap_content" android:layout_height="wrap_content" 
                    android:id="@+id/title" /> 
                <TextView android:textSize="13px" android:textColor="#ffffff" 
                    android:layout_width="wrap_content" android:layout_height="wrap_content" 
                    android:id="@+id/info" /> 
            </LinearLayout> 
 
            <Button android:id="@+id/btn" android:text="@string/viewBtn" 
                android:layout_width="65px" android:layout_height="wrap_content" /> 
        </TableRow> 
    </TableLayout> 
</LinearLayout>