main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/MyLayout"android:orientation="vertical"android:layout_width="fill_parent"android:layout_height="fill_parent"android:gravity="bottom"><ImageSwitcherandroid:id="@+id/myImageSwitcher"android:layout_width="fill_parent"android:layout_height="wrap_content"/><Galleryandroid:id="@+id/myGallery"android:gravity="center_vertical"android:spacing="3px"android:layout_width="fill_parent"android:layout_height="wrap_content"/>
</LinearLayout>

grid_layout.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="horizontal" android:layout_width="wrap_content"android:layout_height="wrap_content"android:background="#FFFFFF"><ImageViewandroid:id="@+id/img"android:layout_width="wrap_content"android:layout_height="wrap_content"android:scaleType="center"/>
</LinearLayout>

MyGalleryDemo.java:

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Gallery;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.LinearLayout.LayoutParams;
import android.widget.SimpleAdapter;
import android.widget.ViewSwitcher.ViewFactory;public class MyGalleryDemo extends Activity {private Gallery gallery = null;                            // 图片浏览private List<Map<String,Integer>> list = new ArrayList<Map<String,Integer>>() ;private SimpleAdapter simpleAdapter = null;                 // 适配器private ImageSwitcher myImageSwitcher = null ;               // 图片切换@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);super.setContentView(R.layout.main);                   // 调用布局文件this.initAdapter() ;                                   // 初始化适配器this.gallery = (Gallery) super.findViewById(R.id.myGallery) ;// 取得组件this.myImageSwitcher = (ImageSwitcher) super.findViewById(R.id.myImageSwitcher);         // 取得组件this.myImageSwitcher.setFactory(new ViewFactoryImpl()) ;// 设置图片工厂this.gallery.setAdapter(this.simpleAdapter);                // 设置图片集this.gallery.setOnItemClickListener(new OnItemClickListenerImpl()) ;// 设置单击事件}private class OnItemClickListenerImpl implements OnItemClickListener {@SuppressWarnings("unchecked")@Overridepublic void onItemClick(AdapterView<?> parent, View view, int position,long id) { Map<String, Integer> map = (Map<String, Integer>) MyGalleryDemo.this.simpleAdapter.getItem(position);                   // 取出MapMyGalleryDemo.this.myImageSwitcher.setImageResource(map.get("img"));                      // 设置显示图片}}public void initAdapter(){                                   // 初始化适配器Field[] fields = R.drawable.class.getDeclaredFields(); for (int x = 0; x < fields.length; x++) {    if (fields[x].getName().startsWith("ispic_")){        // 所有ispic_*命名的图片Map<String,Integer> map = new HashMap<String,Integer>() ; // 定义Maptry {map.put("img", fields[x].getInt(R.drawable.class)) ;} catch (Exception e) {                          // 设置图片资源}this.list.add(map) ;                          // 保存Map}}this.simpleAdapter = new SimpleAdapter(this,             // 实例化SimpleAdapterthis.list,                                       // 要包装的数据集合R.layout.grid_layout,                            // 要使用的显示模板new String[] { "img" },                        // 定义要显示的Map的Keynew int[] {R.id.img });                         // 与模板中的组件匹配}private class ViewFactoryImpl implements ViewFactory {         // 定义视图工厂类@Overridepublic View makeView() {ImageView img = new ImageView(MyGalleryDemo.this);     // 实例化图片显示img.setBackgroundColor(0xFFFFFFFF);                       // 设置背景颜色img.setScaleType(ImageView.ScaleType.CENTER);          // 居中显示img.setLayoutParams(new ImageSwitcher.LayoutParams(      // 自适应图片大小LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));// 定义组件return img;}}}