@Override
10 public void onPageSelected(int arg0) {
11 Animation animation = null;
12 switch (arg0) {
13 case 0:
14 if (currIndex == 1) {
15 animation = new TranslateAnimation(one, 0, 0, 0);
16 } else if (currIndex == 2) {
17 animation = new TranslateAnimation(two, 0, 0, 0);
18 }
19 break;
20 case 1:
21 if (currIndex == 0) {
22 animation = new TranslateAnimation(offset, one, 0, 0);
23 } else if (currIndex == 2) {
24 animation = new TranslateAnimation(two, one, 0, 0);
25 }
26 break;
27 case 2:
28 if (currIndex == 0) {
29 animation = new TranslateAnimation(offset, two, 0, 0);
30 } else if (currIndex == 1) {
31 animation = new TranslateAnimation(one, two, 0, 0);
32 }
33 break;
34 }
35 currIndex = arg0;
36 animation.setFillAfter(true);// True:图片停在动画结束位置
37 animation.setDuration(300);
38 cursor.startAnimation(animation);
39 }
3页切换时的位移动画，比如第一个case，意思是切换到第0页时，分为两种情况，一是从第一页切回0页，二是从第二页切回0页，也是3页轮播。
第15行是当从第一页切到第0页的时候，做了一个位移动画，四个参数分别表示：动画起始坐标x坐标，结束时x坐标，起始y坐标，结束y坐标，以此类推，后边也一样。