gridview

import android.app.Activity;
import android.os.Bundle;
import android.widget.GridView;
import android.widget.SimpleAdapter;

public class GridActivity extends Activity {

    private GridView grid_test;
    private List<Map<String,Object>> dataList;
    private SimpleAdapter simpleAdapter;
    private int[] img = {R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher, R.drawable.ic_launcher,
            R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,
            R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,
            R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,
            R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,
            R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher};
    private  String[] imgName = {"1","2","3","4",
            "5","6","7","8",
            "9","10","11","12",
            "13","14","15","16",
            "17","18","19","20",
            "21","22","23","24"};


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_grid);

        grid_test = (GridView) findViewById(R.id.grid_test);
        dataList = new ArrayList<Map<String, Object>>();
        simpleAdapter = new SimpleAdapter(this,getData(),R.layout.grid_item,
                new String[] {"img","txt"},new int[]{R.id.img_item,R.id.txt_item});
        grid_test.setAdapter(simpleAdapter);
    }

    private  List<Map<String,Object>> getData() {
        for (int i=0; i<img.length; i++) {
            Map<String,Object> map = new HashMap<String, Object>();
            map.put("img", img[i]);
            map.put("txt", imgName[i]);
            dataList.add(map);
        }

        return dataList;
    }
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <GridView
        android:id="@+id/grid_test"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:columnWidth="80dp"
        android:padding="10dp"
        android:numColumns="3"
        android:text="@string/hello_world" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <ImageView
        android:id="@+id/img_item"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" 
        android:layout_gravity="center"/>

    <TextView
        android:id="@+id/txt_item"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" 
        android:layout_gravity="center"/>

</LinearLayout>