Android网格视图girdview

package xcl.grid;

import java.util.ArrayList;
import java.util.HashMap;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.SimpleAdapter;
import android.widget.AdapterView.OnItemClickListener;

public class grid extends Activity {
    GridView grid;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        grid = (GridView)findViewById(R.id.gridview);
      //生成动态数组，并且转入数据  
        ArrayList<HashMap<String, Object>> listitem = new ArrayList<HashMap<String,Object>>();
        for(int i=0;i<10;i++){
            HashMap<String,Object> map = new HashMap<String, Object>();
            map.put("itemimg",R.drawable.icon);
            map.put("itemtext", String.valueOf(i));
            listitem.add(map);
        }
      //生成适配器的ImageItem动态数组的元素，两者一一对应  
        SimpleAdapter sa = new SimpleAdapter(this, 
                listitem, R.layout.night_item, 
                new String[]{"itemimg","itemtext"},
                new int[]{R.id.imageview,R.id.textview
        });
      //添加并且显示  
        grid.setAdapter(sa);
      //添加消息处理  
      //当AdapterView被单击(触摸屏或者键盘)，则返回的Item单击事件 
        grid.setOnItemClickListener(new OnItemClickListener(){

            @Override
            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                    long arg3) {
                // TODO Auto-generated method stub
                HashMap<String, Object> item = (HashMap<String, Object>) arg0.getItemAtPosition(arg2);
                setTitle(item.get("itemtext").toString());
                System.out.println(item.get("itemtext"));
            }
            
        });
    }
}