在Android开发中利用ViewPager实现一个轮播功能

class ImageAdapter extends PagerAdapter { private ArrayList<ImageView> viewlist; public ImageAdapter(ArrayList<ImageView> viewlist) {  this.viewlist = viewlist; } @Override public int getCount() {  // 设置成最大，使用户看不到边界  return Integer.MAX_VALUE; } @Override public boolean isViewFromObject(View arg0, Object arg1) {  return arg0 == arg1; } @Override public void destroyItem(ViewGroup container, int position, Object object) {  // Warning：不要在这里调用removeView } @Override public Object instantiateItem(ViewGroup container, int position) {  // 对ViewPager页号求模取出View列表中要显示的项  position %= viewlist.size();  if (position < 0) {   position = viewlist.size() + position;  }  ImageView view = viewlist.get(position);  // 如果View已经在之前添加到了一个父组件，则必须先remove，否则会抛出IllegalStateException。  ViewParent vp = view.getParent();  if (vp != null) {   ViewGroup parent = (ViewGroup) vp;   parent.removeView(view);  }  container.addView(view);  // add listeners here if necessary  return view; }}