控件：Gallery 1.（自定义适配器）

发现setAdapter()设置的时候可以使用的子类：ArrayAdapter、SimpleAdapter、BaseAdapter。
1.BaseAdapter实际上是一个用户自己去实现的操作，包括定义显示的组件等等。

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns: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">
    <Gallery
        android:id="@+id/myGallery"
        android:gravity="center_vertical"
        android:spacing="3px"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"/>
</LinearLayout>

ImageGalleryAdapter.java

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.LinearLayout.LayoutParams;

public class ImageGalleryAdapter extends BaseAdapter {
    // Context对象
    private Context myContext;                            
    private int imgRes[] = new int[] { 
            R.drawable.ispic_a, R.drawable.ispic_b,
            R.drawable.ispic_c, R.drawable.ispic_d, 
            R.drawable.ispic_e };
    // 接收Context
    public ImageGalleryAdapter(Context c) {                
        this.myContext = c;
    }
    @Override
    public int getCount() {     // 返回图片个数
        return this.imgRes.length;
    }
    @Override
    public Object getItem(int position) {     // 取得指定位置的图片
        return this.imgRes[position];
    }
    @Override
    public long getItemId(int position) {     // 取得指定位置的图片
        return this.imgRes[position];
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView img = new ImageView(this.myContext);
        img.setBackgroundColor(0xFFFFFFFF);
        // 给ImageView设置资源
        img.setImageResource(this.imgRes[position]);
        // 居中显示
        img.setScaleType(ImageView.ScaleType.CENTER);
        // 布局参数
        img.setLayoutParams(new Gallery.LayoutParams(
                LayoutParams.WRAP_CONTENT,
                LayoutParams.WRAP_CONTENT));            
        return img;
    }

}

MyGalleryDemo.java

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.Toast;

public class MyGalleryDemo extends Activity {
    // 图片浏览
    private Gallery gallery = null;                             
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // 调用布局文件
        super.setContentView(R.layout.main);                
        // 取得组件
        this.gallery = (Gallery) super.findViewById(R.id.myGallery) ;
        // 设置图片集
        this.gallery.setAdapter(new ImageGalleryAdapter(this));    
        // 设置单击事件
        this.gallery.setOnItemClickListener(new OnItemClickListenerImpl()) ;
    }
    private class OnItemClickListenerImpl implements OnItemClickListener {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position,long id) {
            // 显示图片编号
            Toast.makeText(MyGalleryDemo.this, 
                    "" + position, Toast.LENGTH_SHORT).show();                                         
        }
        
    }
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="org.lxh.demo"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="3" />

    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".MyGalleryDemo"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>
</manifest>