1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical" >
 6
 7
 8
 9     <Gallery
10         android:id="@+id/gallery"
11         android:spacing="5px"          //设置列表项之间的间距为5像素
12         android:unselectedAlpha="0.5"  //设置未被选中的列表项的透明度
13         android:layout_width="match_parent"
14         android:layout_height="wrap_content" />
15
16
17 </LinearLayout>

 1 package xqx;
 2
 3 import com.example.xqx_lianxi.R;
 4
 5 import android.app.Activity;
 6 import android.content.res.TypedArray;
 7 import android.os.Bundle;
 8 import android.view.View;
 9 import android.view.ViewGroup;
10 import android.widget.AdapterView;
11 import android.widget.AdapterView.OnItemClickListener;
12 import android.widget.BaseAdapter;
13 import android.widget.Gallery;
14 import android.widget.ImageView;
15 import android.widget.Toast;
16
17 public class MainGallery extends Activity{
18      //设置画廊图片
19     private int[] imageId = new int[] { R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher};
20     @Override
21     protected void onCreate(Bundle savedInstanceState) {
22         // TODO Auto-generated method stub
23         super.onCreate(savedInstanceState);
24         setContentView(R.layout.main_gallery);
25         //获取Gallery组件
26         Gallery gallery = (Gallery) findViewById(R.id.gallery);
27         BaseAdapter adapter = new BaseAdapter() {
28                //获取当前选项ID
29                @Override
30                public long getItemId(int position) {
31                    return position;
32                }
33                //获取当前选项值
34                @Override
35                public Object getItem(int position) {
36                    return position;
37                }
38                //获取数量
39                @Override
40                public int getCount() {
41                    return imageId.length;
42                }
43
44             @Override
45             public View getView(int position, View convertView, ViewGroup parent) {
46                 ImageView imageview;   //声明ImageView的对象
47                 if (convertView == null) {
48                     imageview = new ImageView(MainGallery.this); //创建ImageView的对象
49                     imageview.setScaleType(ImageView.ScaleType.FIT_XY);  //设置缩放方式
50                     imageview.setLayoutParams(new Gallery.LayoutParams(500, 400));
51                     TypedArray typedArray = obtainStyledAttributes(R.styleable.Gallery);
52                     imageview.setBackgroundResource(typedArray.getResourceId(
53                             R.styleable.Gallery_android_galleryItemBackground,
54                             0));
55                     imageview.setPadding(5, 0, 5, 0);  //设置imageview的内边距
56                 }
57                 else
58                 {
59                     imageview = (ImageView) convertView;
60                 }
61                 imageview.setImageResource(imageId[position]);
62                 return imageview;
63             }
64
65         };
66            //将适配器与Gallery关联
67            gallery.setAdapter(adapter);
68            gallery.setSelection(imageId.length / 2); //默认显示的图片的id
69            //画廊图片的点击事件
70            gallery.setOnItemClickListener(new OnItemClickListener() {
71                @Override
72                public void onItemClick(AdapterView<?> parent, View view,
73                        int position, long id) {
74
75                    Toast.makeText(MainGallery.this,
76                            "第" + String.valueOf(position+1) + "张图片被选中",
77                            Toast.LENGTH_SHORT).show();
78                }
79            });
80
81 }
82 }

1 <declare-styleable name="Gallery">
2         <attr name="android:galleryItemBackground" />
3     </declare-styleable>