GridView常用的XML属性：
android:columnWidth
 设置列的宽度.
android:horizontalSpacing
 两列之间的间距.
 android:numColumns
 设置列数.可以为具体数字,也可以为auto_fit 表示自动适应 
 android:stretchMode
 缩放模式
 android:verticalSpacing
 两行之间的间距

例子:

<?xml version="1.0" encoding="utf-8"?>

<GridView xmlns:android="http://schemas.android.com/apk/res/android"

    android:id="@+id/gridview"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:columnWidth="90dp"

    android:numColumns="auto_fit"

    android:verticalSpacing="10dp"

    android:horizontalSpacing="10dp"

    android:stretchMode="columnWidth"

    android:gravity="center"

    />

package com.light.android.study;

import java.util.ArrayList;

import java.util.List;

import android.app.Activity;

import android.content.Context;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.view.Window;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.BaseAdapter;

import android.widget.GridView;

import android.widget.ImageView;

import android.widget.TextView;

import android.widget.Toast;

public class MainActivity extends Activity {

		private GridView gridView;

	    //图片的文字标题

	    private String[] titles = new String[]

	    { "pic1", "pic2", "pic3", "pic4", "pic5", "pic6", "pic7", "pic8", "pic9"};

	    //图片ID数组

	    private int[] images = new int[]{

	            R.drawable.gallery_photo_1, R.drawable.gallery_photo_2, R.drawable.gallery_photo_3,

	            R.drawable.gallery_photo_4, R.drawable.gallery_photo_5, R.drawable.gallery_photo_6,

	            R.drawable.photo1, R.drawable.photo2, R.drawable.photo3

	    }; 

	    @Override

	    public void onCreate(Bundle savedInstanceState){

	        super.onCreate(savedInstanceState);

	        requestWindowFeature(Window.FEATURE_NO_TITLE);

	        setContentView(R.layout.activity_main);

	        gridView = (GridView) findViewById(R.id.gridview); 

	        PictureAdapter adapter = new PictureAdapter(titles, images, this);

	        gridView.setAdapter(adapter); 

	        //點擊事件

	        gridView.setOnItemClickListener(new OnItemClickListener()

	            {

	                public void onItemClick(AdapterView<?> parent, View v, int position, long id)

	                {

	                    Toast.makeText(MainActivity.this, "pic" + (position+1), Toast.LENGTH_SHORT).show();

	                }

	            });

	    } 

	//自定义适配器

	class PictureAdapter extends BaseAdapter{

	    private LayoutInflater inflater;

	    private List<Picture> pictures; 

	    public PictureAdapter(String[] titles, int[] images, Context context)

	    {

	        super();

	        pictures = new ArrayList<Picture>();

	        inflater = LayoutInflater.from(context);

	        for (int i = 0; i < images.length; i++)

	        {

	            Picture picture = new Picture(titles[i], images[i]);

	            pictures.add(picture);

	        }

	    } 

	    @Override

	    public int getCount()

	    {

	        if (null != pictures)

	        {

	            return pictures.size();

	        } else

	        {

	            return 0;

	        }

	    } 

	    @Override

	    public Object getItem(int position)

	    {

	        return pictures.get(position);

	    } 

	    @Override

	    public long getItemId(int position)

	    {

	        return position;

	    } 

	    @Override

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

	    {

	        ViewHolder viewHolder;

	        if (convertView == null)

	        {

	            convertView = inflater.inflate(R.layout.picture_item, null);

	            viewHolder = new ViewHolder();

	            viewHolder.title = (TextView) convertView.findViewById(R.id.title);

	            viewHolder.image = (ImageView) convertView.findViewById(R.id.image);

	            convertView.setTag(viewHolder);

	        } else

	        {

	            viewHolder = (ViewHolder) convertView.getTag();

	        }

	        viewHolder.title.setText(pictures.get(position).getTitle());

	        viewHolder.image.setImageResource(pictures.get(position).getImageId());

	        return convertView;

	    } 

	} 

	class ViewHolder

	{

	    public TextView title;

	    public ImageView image;

	} 

	class Picture

	{

	    private String title;

	    private int imageId; 

	    public Picture()

	    {

	        super();

	    } 

	    public Picture(String title, int imageId)

	    {

	        super();

	        this.title = title;

	        this.imageId = imageId;

	    } 

	    public String getTitle()

	    {

	        return title;

	    } 

	    public void setTitle(String title)

	    {

	        this.title = title;

	    } 

	    public int getImageId()

	    {

	        return imageId;

	    } 

	    public void setImageId(int imageId)

	    {

	        this.imageId = imageId;

	    }

	}

}

知识点:

GridView中的item实现自适应正方形

http://yunfeng.sinaapp.com/?p=465

http://yunfeng.sinaapp.com/?p=466