Android图片无限轮播的实现代码

public class MainActivity extends Activity {

  private ViewPager viewPager;
  private LinearLayout ll_dot;
   private String[] imageUrls = new String[] {
  "http://pic8.nipic.com/20100701/5290458_114840036316_2.jpg",
   "http://pic2.nipic.com/20090424/1468853_230119053_2.jpg",
   "http://img3.3lian.com/2013/s1/20/d/57.jpg",
  "http://pic39.nipic.com/20140226/18071023_164300608000_2.jpg",
  "http://a0.att.hudong.com/15/08/300218769736132194086202411_950.jpg" };

  //private String[] imageUrls = new String[] {
      //"http://192.168.230.1:8080/ab.jpg",
      //"http://192.168.230.1:8080/ae.jpg",
      //"http://192.168.230.1:8080/af.jpg",
      //"http://192.168.230.1:8080/ah.jpg" };

  private ArrayList viewList;
  private ArrayList dotList;
  Handler handler = new Handler() {
    public void handleMessage(android.os.Message msg) {
      // 先去获取到当前条目索引
      int currentItem = viewPager.getCurrentItem();
      // 条目索引+1
      currentItem++;
      // 重新设置给viewPager
      viewPager.setCurrentItem(currentItem);
      // 再调用发延时消息的方法
      sendDelayMessage();
    };
  };

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    viewPager = (ViewPager) findViewById(R.id.viewPager);
    ll_dot = (LinearLayout) findViewById(R.id.ll_dot);
    // 初始化图片
    initViewList();
    // 初始化小圆点
    initDots();
    // 设置数据适配器
    viewPager.setAdapter(new MyPagerAdapter(this, viewList, handler));
    // 设置初始的展示条目
    viewPager.setCurrentItem(viewList.size() * 100000);
    // 设置延时切换
    sendDelayMessage();

    // 监听viewPager的一个滑动事件
    viewPager.setOnPageChangeListener(new OnPageChangeListener() {
      @Override
      public void onPageSelected(int position) {
        // 遍历小点的集合
        for (int i = 0; i ();
    dotList.clear();
    for (int i = 0; i ();
    for (int i = 0; i 

public class MyPagerAdapter extends PagerAdapter {
  private List viewList;
  private Context context;
  private Handler handler;

  public MyPagerAdapter(Context context, List viewList,
      Handler handler) {
    this.cOntext= context;
    this.viewList = viewList;
    this.handler = handler;
  }

  @Override
  public int getCount() {
    return Integer.MAX_VALUE;
  }

  @Override
  public boolean isViewFromObject(View arg0, Object arg1) {
    return arg0 == arg1;
  }

  @Override
  public Object instantiateItem(ViewGroup container, int position) {
    // 通过控件集合获取imageView 添加到容器中，并作为key 返回
    ImageView imageView = viewList.get(position % viewList.size());
    imageView.setOnTouchListener(new OnTouchListener() {
      @Override
      public boolean onTouch(View v, MotionEvent event) {
        switch (event.getAction()) {
        // 当按下的时候，停止轮播
        case MotionEvent.ACTION_DOWN:
          // 移除所有的回调和消息
          handler.removeCallbacksAndMessages(null);
          break;
        // 抬起
        case MotionEvent.ACTION_UP:
          handler.sendEmptyMessageDelayed(0, 2000);
          break;
        // 取消的时候，继续开始录播
        case MotionEvent.ACTION_CANCEL:
          handler.sendEmptyMessageDelayed(0, 2000);
          break;
        default:
          break;
        }
        //触摸事件不被消费，true 消费该触摸事件
        return true;
      }
    });
    container.addView(imageView);
    return imageView;
  }

  @Override
  public void destroyItem(ViewGroup container, int position, Object object) {
    // super.destroyItem(container, position, object);
    container.removeView((View) object);
  }
}