convertView的疑问（软件管理器）

package com.hixin.appexplorer;

import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.TextView;

public class MainActivity extends Activity {

    GridView gv;
    private List<PackageInfo> packageInfos;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.show_app_grid);
        init();
        gv=(GridView)this.findViewById(R.id.gv_apps);
        gv.setAdapter(new GridViewAdapter(this));
    
        }
    private void init(){
        packageInfos = getPackageManager().getInstalledPackages(PackageManager.GET_UNINSTALLED_PACKAGES);
    }
    class GridViewAdapter extends BaseAdapter{

        LayoutInflater inflater;
        public GridViewAdapter(Context context) {
            inflater = LayoutInflater.from(context);
        }
        @Override
        public int getCount() {
            // TODO Auto-generated method stub
            return packageInfos.size();
        }

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

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

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            // TODO Auto-generated method stub
        
                View view = inflater.inflate(R.layout.gv_item, null);
                TextView tv = (TextView)view.findViewById(R.id.gv_item_appname);
                ImageView iv = (ImageView)view.findViewById(R.id.gv_item_icon);
                tv.setText(packageInfos.get(position).packageName);
                iv.setImageDrawable(packageInfos.get(position).applicationInfo.loadIcon(getPackageManager()));
            
            return view;
        }
        
    }
}

    

其中getView函数没有用到，程序运行并没有问题