public void initItemList(List<MediaIntro> mediaList){
      List<MediaIntro> newMediaList = new ArrayList<MediaIntro>();
      newMediaList.addAll(mediaList);
      if(newMediaList.size() > 1){
        //第0个位最后一个，向左拉动时，可以实现直接滑动到最后一个，最后一个是第0个，可以实现向右滑动的时直接跳到第0个
        newMediaList.add(0,mediaList.get(mediaList.size() -1));
        newMediaList.add(mediaList.get(0));
      }
      mMediaList = newMediaList;
    }

public class AdImagePagerAdapter extends RecyclingPagerAdapter{
    private LayoutInflater mInflater;
    private List<MediaIntro> mMediaList = new ArrayList<MediaIntro>();

    private boolean isInfiniteLoop; //是否无限循环
    int size;

    public AdImagePagerAdapter (LayoutInflater inflater ,List<MediaIntro> mediaList){
      mInflater = inflater;
      isInfiniteLoop = false;
      initItemList(mediaList);
      size = mMediaList.size();
    }

    public void initItemList(List<MediaIntro> mediaList){
      List<MediaIntro> newMediaList = new ArrayList<MediaIntro>();
      newMediaList.addAll(mediaList);
      if(newMediaList.size() > 1){
        //第0个位最后一个，向左拉动时，可以实现直接滑动到最后一个，最后一个是第0个，可以实现向右滑动的时直接跳到第0个
        newMediaList.add(0,mediaList.get(mediaList.size() -1));
        newMediaList.add(mediaList.get(0));
      }
      mMediaList = newMediaList;
    }

    public MediaIntro getItem(int position){
      return mMediaList.get(position);
    }
    public int getPosition(int position){
      return isInfiniteLoop? position%size:position;
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
      // TODO Auto-generated method stub
      final ViewHolder holder;
      final MediaIntro media = getItem(position);
      if(convertView == null){
        holder = new ViewHolder();
        convertView = mInflater.inflate(R.layout.home_ad_item, parent,false);
        holder.mImageView = (ImageView)convertView.findViewById(R.id.homeAdItemImg);
        holder.mTextView = (TextView)convertView.findViewById(R.id.homeAdItemTxt);
        convertView.setTag(holder);
      }else{
        holder=(ViewHolder)convertView.getTag();
      }
      if(media.source.equals(MagicSource.SOURCE_OUT_AD)){
        imageLoader.displayImage(adImageUrl,holder.mImageView,adImageOptions,null,null);
        holder.mTextView.setText("");
        holder.mImageView.setOnClickListener(new OnClickListener() {
          @Override
          public void onClick(View v) {
            // TODO Auto-generated method stub
            //广告点击事件
          }
        });
      }else {
        imageLoader.displayImage(media.imgUrl, holder.mImageView,adImageOptions,null,null);
        holder.mTextView.setText(media.desc+"");
        holder.mImageView.setOnClickListener(new OnClickListener() {

          @Override
          public void onClick(View v) {
            // TODO Auto-generated method stub
            startMediaDetail(media);
          }
        });
      }
      return convertView;
    }
    @Override
    public int getCount() {
      // TODO Auto-generated method stub
      return isInfiniteLoop ? Integer.MAX_VALUE : mMediaList.size();
    }
    private class ViewHolder{
      ImageView mImageView = null;
      TextView mTextView = null;
    }
    public boolean isInfiniteLoop(){
      return isInfiniteLoop;
    }
    public AdImagePagerAdapter setInfiniteLoop(boolean isInfiniteLoop){
      this.isInfiniteLoop =isInfiniteLoop;
      return this;
    }
  }

@Override
    public void onPageSelected(int position) {
      // TODO Auto-generated method stub

      if(adImageAdapter.getCount()>1){ 
        if(position<1){
          position=adImageAdapter.getCount()-2;
          adViewPager.setCurrentItem(adImageAdapter.getCount()-2,false);
        }else if(position > adImageAdapter.getCount()-2){
          position = 1;
          adViewPager.setCurrentItem(1, false);
        }
        setAdPagePointSelected(position-1);
      }
    }

public class OnAdPageChangeListener implements OnPageChangeListener{

    @Override
    public void onPageScrollStateChanged(int arg0) {
      // TODO Auto-generated method stub

    }

    @Override
    public void onPageScrolled(int arg0, float arg1, int arg2) {
      // TODO Auto-generated method stub

    }

    @Override
    public void onPageSelected(int position) {
      // TODO Auto-generated method stub

      if(adImageAdapter.getCount()>1){ 
        if(position<1){
          position=adImageAdapter.getCount()-2;
          adViewPager.setCurrentItem(adImageAdapter.getCount()-2,false);
        }else if(position > adImageAdapter.getCount()-2){
          position = 1;
          adViewPager.setCurrentItem(1, false);
        }
        setAdPagePointSelected(position-1);
      }
    }

  }