自定义BaseAdapter，兑现列表显示功能

public class AppInfo{  
	public String appName = null;//应用程序名
	public Drawable icon = null;//应用程序图片
	
}

import java.util.List;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

public class ListViewAdapter extends BaseAdapter{

	    private Context context;
	    private List<AppInfo> appList;

	    public ListViewAdapter(Context context, List<AppInfo> appList)
	    {
	        this.context = context;
	        this.appList = appList;
	    }

	    @Override
	    public int getCount()
	    {
	        // TODO Auto-generated method stub
	        return appList.size();
	    }

	    @Override
	    public Object getItem(int position)
	    {
	        // TODO Auto-generated method stub
	        return appList.get(position);
	    }

	    @Override
	    public long getItemId(int position)
	    {
	        // TODO Auto-generated method stub
	        return 0;
	    }

	    @Override
	    public View getView(int position, View convertView, ViewGroup parent)
	    {
	        // TODO Auto-generated method stub
	        View view = null;
	        ViewHolder holder = null;

	        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

	        if (convertView == null)
	        {
	            view = inflater.inflate(R.layout.list_item, null);
	            holder = new ViewHolder(view);
	            view.setTag(holder);
	        } else
	        {
	            view = convertView;
	            holder = (ViewHolder) convertView.getTag();
	        }        
	        AppInfo appInfo = (AppInfo)getItem(position);
	        holder.tvInfo.setText(appInfo.appName);
	        holder.imgInfo.setImageDrawable(appInfo.icon);
	        return view;
	    }

	    class ViewHolder
	    {
	        TextView tvInfo;
	        ImageView imgInfo;

	        public ViewHolder(View view)
	        {
	            tvInfo = (TextView) view.findViewById(R.id.tv01);
	            imgInfo = (ImageView) view.findViewById(R.id.img01);
	        }
	    }

	}

import android.app.Activity;
import android.app.AlertDialog;
import android.content.pm.PackageInfo;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;
import android.widget.ListView;
import java.util.*;

public class MyActivity extends Activity {
	
	    private ListView listView = null;
	    private List<AppInfo> appList = new ArrayList<AppInfo>();
	    private List<PackageInfo> manager = null;

	    @Override
	    public void onCreate(Bundle savedInstanceState)
	    {
	        super.onCreate(savedInstanceState);
	        setContentView(R.layout.main);

	        listView = (ListView) findViewById(R.id.mylist);

	        manager = getPackageManager().getInstalledPackages(0);
	        for (int i = 0; i < manager.size(); i++)
	        {
	            PackageInfo packageInfo = manager.get(i);
	            //应用程序信息存储到appinfo里
	            AppInfo appInfo = new AppInfo();
	            appInfo.appName = packageInfo.applicationInfo.loadLabel(getPackageManager()).toString();
	            appInfo.icon = packageInfo.applicationInfo.loadIcon(getPackageManager());
	            appList.add(appInfo);
	        }
	        
	        ListViewAdapter adapter = new ListViewAdapter(this, appList);
	        listView.setAdapter(adapter);
	    }
	}

<?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"
    >
    
    <ImageView 
        android:id="@+id/img01"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        />
    <TextView  
        android:id="@+id/tv01"
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content"         
        />
</LinearLayout>

<?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="wrap_content" 
        android:text="@string/hello"
        />
</LinearLayout>