1 //gallery实现图片大图预览的循环播放
 2 //ImageSwitcher 和 ImageView 的功能有点类似，他们都可以用于显示图片，
 3 //区别在于 ImageSwitcher 的效果更炫，它可以指定图片切换时的动画效果。
 4 //ImageSwitcher实现ViewFactory,监听事件 OnItemSelectedListener
 5 public class MainActivity extends Activity implements OnItemSelectedListener,
 6         ViewFactory {
 7     // 准备数据源
 8     private int[] res = { R.drawable.item1, R.drawable.item2, R.drawable.item3,
 9             R.drawable.item4, R.drawable.item5, R.drawable.item6,
10             R.drawable.item7, R.drawable.item8, R.drawable.item9,
11             R.drawable.item10, R.drawable.item11, R.drawable.item12 };
12     private Gallery gallery;
13     private ImageAdapter adapter;
14
15
16     private ImageSwitcher imageSwitcher;
17
18     // ArrayAdapter<String> adapter;
19     // SimpleAdapter adapter2;
20     @Override
21     protected void onCreate(Bundle savedInstanceState) {
22         super.onCreate(savedInstanceState);
23         setContentView(R.layout.main);
24         gallery = (Gallery) findViewById(R.id.gallery);
25         imageSwitcher = (ImageSwitcher) findViewById(R.id.imageswitcher);
26
27         // gallery加载适配器
28         adapter = new ImageAdapter(res, this);
29         gallery.setAdapter(adapter);
30         gallery.setOnItemSelectedListener(this);
31
32         imageSwitcher.setFactory(this);
33         //添加动画效果
34         imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(this,
35                 android.R.anim.fade_in));
36         imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this,
37                 android.R.anim.fade_out));
38
39     }
40
41     @Override
42     public void onItemSelected(AdapterView<?> parent, View view, int position,
43             long id) {
44         // TODO Auto-generated method stub
45
46         imageSwitcher.setBackgroundResource(res[position % res.length]);
47     }
48
49     @Override
50     public void onNothingSelected(AdapterView<?> parent) {
51         // TODO Auto-generated method stub
52
53     }
54
55     @Override
56     public View makeView() {
57         // TODO Auto-generated method stub
58         ImageView imageView = new ImageView(this);
59         imageView.setScaleType(ScaleType.FIT_CENTER);// 大图预览
60         return imageView;
61     }
62
63 }

 1 public class ImageAdapter extends BaseAdapter {
 2     private int[] res;
 3     private Context context;
 4
 5     public ImageAdapter(int[] res, Context context) {
 6         // TODO Auto-generated constructor stub
 7         this.res = res;
 8         this.context = context;
 9     }
10
11     // 返回已定义的数据源总数量
12     @Override
13     public int getCount() {
14         // TODO Auto-generated method stub
15
16         //return res.length;
17         return Integer.MAX_VALUE;//循环播放
18     }
19
20     // 告诉适配器取得目前容器中的数据ID和对象
21     @Override
22     public Object getItem(int position) {
23         // TODO Auto-generated method stub
24         return res[position];
25     }
26
27     @Override
28     public long getItemId(int position) {
29         // TODO Auto-generated method stub
30         return position;
31     }
32
33     // 取得目前欲显示的图像view，传入数组ID值使之读取与成像
34     @Override
35     public View getView(int position, View convertView, ViewGroup parent) {
36         // TODO Auto-generated method stub
37         ImageView imageView = new ImageView(context);
38         imageView.setBackgroundResource(res[position%res.length]);//循环播放
39         imageView.setLayoutParams(new Gallery.LayoutParams(100,50));//设置图像大小
40
41         imageView.setScaleType(ScaleType.FIT_XY);
42         return imageView;
43     }
44
45 }