<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:layout_width="fill_parent"  
    android:layout_height="fill_parent"  
    android:orientation="vertical" >  
    <ImageView   
        android:id="@+id/imageView"  
        android:layout_width="match_parent"  
        android:layout_height="0dip"  
        android:layout_weight="1"/>  
    <Gallery   
        android:id="@+id/gallery"  
        android:layout_width="match_parent"  
        android:layout_height="wrap_content"  
        android:layout_marginTop="25dip"  
        android:unselectedAlpha="0.6"  
        android:spacing="2pt"/>  
</LinearLayout>  

package com.example.testgallary;  
  
import android.app.Activity;  
import android.content.res.TypedArray;  
import android.os.Bundle;  
import android.view.View;  
import android.view.ViewGroup;  
import android.widget.AdapterView;  
import android.widget.AdapterView.OnItemSelectedListener;  
import android.widget.BaseAdapter;  
import android.widget.Gallery;  
import android.widget.ImageView;  
  
public class MainActivity extends Activity {  
  
    private int[] imageIds = new int[]{  
            R.drawable.img1, R.drawable.img2,  
            R.drawable.img3, R.drawable.img4,  
            R.drawable.img5, R.drawable.img6,  
    };  
      
    private Gallery gallery;  
    private ImageView imageView;  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
        gallery = (Gallery) findViewById(R.id.gallery);  
        imageView = (ImageView) findViewById(R.id.imageView);  
          
        BaseAdapter adapter = new BaseAdapter() {  
              
            @Override  
            public View getView(int position, View convertView, ViewGroup parent) {  
                // 创建一个ImageView  
                ImageView imageView = new ImageView(MainActivity.this);  
                imageView.setImageResource(imageIds[position]);  
                // 设置ImageView的缩放类型  
                imageView.setScaleType(ImageView.ScaleType.FIT_XY);  
                // 为imageView设置布局参数  
                imageView.setLayoutParams(new Gallery.LayoutParams(75, 100));  
                TypedArray typedArray = obtainStyledAttributes(  
                        R.styleable.Gallery);  
                imageView.setBackgroundResource(typedArray.getResourceId(  
                        R.styleable.Gallery_android_galleryItemBackground, 0));  
                return imageView;  
            }  
              
            @Override  
            public long getItemId(int position) {  
                // TODO Auto-generated method stub  
                return position;  
            }  
              
            @Override  
            public Object getItem(int item) {  
                // TODO Auto-generated method stub  
                return item;  
            }  
              
            @Override  
            public int getCount() {  
                // TODO Auto-generated method stub  
                return imageIds.length;  
            }  
        };  
          
        gallery.setAdapter(adapter);  
        gallery.setOnItemSelectedListener(new OnItemSelectedListener() {  
  
            @Override  
            public void onItemSelected(AdapterView<?> parent, View view,  
                    int position, long id) {  
                imageView.setImageResource(imageIds[position]);  
                  
            }  
  
            @Override  
            public void onNothingSelected(AdapterView<?> view) {  
                  
                  
            }  
        });  
    }  
  
}