AndroidStudio如何实现九宫格功能

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package edu.hrbust.syoneninelayout;

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

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

public class MainActivity extends Activity {
 // 调用活动
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 // 关联activity_main.xml 和 控件GridView
 setContentView(R.layout.activity_main);
 GridView gridView = (GridView) findViewById(R.id.GridView);
 // 构建ArrayList是HashMap格式，HashMap格式是
 ArrayList> meumList = new ArrayList>();
 // 向ArrayList填入数据 图片+i i设置为1~9,形成九宫格
 for(int i = 1; i < 10; i++){
  HashMap map = new HashMap();
  //R.mipmap.ic_luminggai是关联的图片 我的图片在res的mipmap下面
  map.put("ItemImage",R.mipmap.ic_luminggai);
  map.put("ItemText",""+i);
  meumList.add(map);
 }
 // 构建数据适配器
 SimpleAdapter saItem = new SimpleAdapter(this,
  meumList,
  R.layout.item,
  new String[]{"ItemImage","ItemText"},
  new int[]{R.id.ItemImage,R.id.ItemText});
 // 应用适配器
 gridView.setAdapter(saItem);
 gridView.setOnItemClickListener(
  new OnItemClickListener() {
   @SuppressLint("WrongConstant")
   public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
   int index = arg2 + 1;
   Toast.makeText(getApplicationContext(),"点击了选项：" + index,0).show();
   }
  }
 );
 }
}