Android 使用 ViewPager循环广告位的实现

final List<Integer> datas = new ArrayList<>();
//这里添加测试数据，实际项目中可以是从网络获取数据
    datas.add(R.mipmap.welcome_page_01);
    datas.add(R.mipmap.welcome_page_02);
    datas.add(R.mipmap.welcome_page_03);
    //处理数据源
    datas.add(0,datas.get(datas.size()-1));
    datas.add(datas.get(1));

mViewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
      @Override
      public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
      }
      @Override
      public void onPageSelected(int position) {
        if(position==0){
          mViewPager.setCurrentItem(datas.size()-2,false);
        }else if(position==datas.size()-1){
          mViewPager.setCurrentItem(1,false);
        }
      }
      @Override
      public void onPageScrollStateChanged(int state) {
      }
    });

  public class BannerHander extends Handler{
    @Override
    public void handleMessage(Message msg) {
      if(msg.what==1){
        mViewPager.setCurrentItem(mViewPager.getCurrentItem()+1);
        sendEmptyMessageDelayed(1,3000);
      }
    }
  }

if(!(mHandler!=null && mHandler.get()!=null)){
　　mHandler = new WeakReference<BannerHander>(new BannerHander());
}
mHandler.get().sendEmptyMessageDelayed(1, 300);