如何手动选择页面查看器位置的滑动图像？

Question

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
    View itemView = mLayoutInflater.inflate(R.layout.viewpager_item, container, false);

    ImageView imageView = (ImageView) itemView.findViewById(R.id.imageView);

    if(count== 1){
        imageView.setImageResource(mThumbIds[firstposition]);
        count++;
        position=firstposition;

    }
    else
    {
        imageView.setImageResource(mThumbIds[position]);

    }

    container.addView(itemView);

    return itemView;
}