实现效果：

activity文件代码：

package com.tmacsky;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.GridView;

import android.widget.ImageView;

public class MyGridViewActivity extends Activity {

	//定义图片数组

	private int[] mImages = new int[]{R.drawable.ha,R.drawable.hb,R.drawable.hc,R.drawable.hd,R.drawable.he,R.drawable.hf,R.drawable.hg,R.drawable.hh};

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		// TODO Auto-generated method stub

		super.onCreate(savedInstanceState);

		setContentView(R.layout.gridview);

		GridView gView = (GridView)findViewById(R.id.gView);

		//建立数据源，设置adapter

		gView.setAdapter(new ImageAdapter());

	}

	class ImageAdapter extends BaseAdapter{

		public int getCount() {

			// TODO Auto-generated method stub

			return mImages.length;

		}

		public Object getItem(int position) {

			// TODO Auto-generated method stub

			return mImages[position];

		}

		public long getItemId(int position) {

			// TODO Auto-generated method stub

			return mImages[position];

		}

		public View getView(int position, View convertView, ViewGroup parent) {

			// TODO Auto-generated method stub

			ImageView imageView = new ImageView(MyGridViewActivity.this);

			imageView.setLayoutParams(new GridView.LayoutParams(85, 85));

			imageView.setPadding(5, 5, 5, 5);

			imageView.setImageResource(mImages[position]);

			return imageView;

		}

	}

}

对应gridview.xml的代码：

<?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" >

    <GridView

        android:horizontalSpacing="2dp"

        android:verticalSpacing="2dp"

        android:columnWidth="100dp"

        android:numColumns="auto_fit"

        android:id="@+id/gView"

        android:layout_width="wrap_content"

		android:layout_height="match_parent"

        />

</LinearLayout>

更多详情参看官方帮助文档里的GridView源码：