Gallery与Spinner组件有共同的父类：AbsSpinner，表明Gallery和Spinner都是一个列表框。它们之间的区别在于Spinner显示的是一个垂直的列表选择框吗，而Gallery显示的是一个水平的列表选择框。

下面以一个例子来说明：

activity_main.xml

MainActivity.java

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) {											}		});	}}

运行结果：