图片浏览gallery控件自定义风格，即加上灰色边框：

1、main.xml文件如下：

[java] 
<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="www.2cto.com" 
    android:id="@+id/widget0" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    > 
<Gallery 
    android:id="@+id/Gallery" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:layout_centerInParent="true" 
    /> 
</RelativeLayout> 

2、attrs.xml文件如下：

[java]
<?xml version="1.0" encoding="utf-8"?> 
<resources> 
    <declare-styleable name="Gallery1"> 
        <attr name="android:galleryItemBackground" /> 
    </declare-styleable> 
</resources> 

3、Activity代码如下：

[java] 
public class gallery extends Activity { 
    private int size; 
    private List<Drawable> list = new ArrayList<Drawable>(); 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        //全屏 
        requestWindowFeature(Window.FEATURE_NO_TITLE); 
       getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN); 
        setContentView(R.layout.main); 
         
        final Object data = getLastNonConfigurationInstance(); 
        if(data == null){ 
            getImage(); 
        }else{ 
            list = (List<Drawable>) data; 
        } 
         
        final Gallery g = (Gallery) findViewById(R.id.Gallery); 
        g.setAdapter(new ImageAdapter(this,list)); 
        //默认显示Gallery的中间一个图片 
        g.setSelection(size/2); 
    } 
 
    @Override 
    public Object onRetainNonConfigurationInstance() { 
        return list; 
    } 
 
    //获取系统应用的图标 
    private List<Drawable> getImage(){ 
        PackageManager packageManager = this.getPackageManager(); 
        Intent intent = new Intent(Intent.ACTION_MAIN); 
        intent.addCategory(Intent.CATEGORY_LAUNCHER); 
        List<ResolveInfo> infos = packageManager.queryIntentActivities(intent, 0); 
        for(ResolveInfo info : infos){ 
            ActivityInfo ai = info.activityInfo; 
            Drawable icon = ai.loadIcon(packageManager); 
            list.add(icon); 
       } 
       return list; 
    } 
} 

4、适配器代码如下：

[java] 
public class ImageAdapter extends BaseAdapter { 
    int mGalleryItemBackGround; 
    private Context mContext; 
    private List<Drawable> list; 
    public ImageAdapter(Context mContext,List<Drawable> li) { 
        this.mContext = mContext; 
        this.list = li; 
        TypedArray a = mContext.obtainStyledAttributes(R.styleable.Gallery1); 
        mGalleryItemBackGround = a.getResourceId(R.styleable.Gallery1_android_galleryItemBackground, 0); 
        a.recycle(); 
    } 
 
    public int getCount() { 
        return list.size(); 
    } 
 
    public Object getItem(int position) { 
        return position; 
    } 
 
    public long getItemId(int position) { 
        return position; 
    } 
 
    public View getView(int position, View convertView, ViewGroup parent) { 
        // 声明一个ImageView对象 
        ImageView i = new ImageView(mContext);   
        BitmapFactory.Options options = new BitmapFactory.Options(); 
        //设置图片的大小，宽高都为原来的二分之一，即图片为原来的四分之一  
        options.inSampleSize = 2;  
        i.setImageDrawable(list.get(position)); 
        //设置layout的宽高 
        i.setLayoutParams(new Gallery.LayoutParams(200,200));//layout   
        //重新设置图片的宽高 
        i.setScaleType(ImageView.ScaleType.FIT_XY);//set scale type 
        //设置图片的背景，即自定义的背景风格 
        i.setBackgroundResource(mGalleryItemBackGround); 
        return i; 
    } 
    class ViewHolder{ 
        ImageView image; 
    } 
}