实现无限循环ViewPager

来源：互联网发布：网络会议软件编辑：程序博客网时间：2024/05/17 08:17

（1）设置ViewPager的Adapter中的item数量为无限大。
（2）在Adapter的instantiateItem方法中用当前的position 除以图片数组长度取余数是关键，数据显示在数据显示是在0至size-1之间
（3）设置viewpager在无限大item中间

mViewHolder.mViewPager.setAdapter(new HotSalePagerAdapter(mContext, recommandList));mViewPager.setCurrentItem(recommandList.size() * 100);

public class HotSalePagerAdapter extends PagerAdapter {    private Context mContext;    private ArrayList<RecommandBodyValue> mData;    private LayoutInflater mInflate;    private ImageLoaderManager mImageLoader;    public HotSalePagerAdapter(Context context, ArrayList<RecommandBodyValue> list) {        mContext = context;        mData = list;        mInflate = LayoutInflater.from(mContext);        mImageLoader = ImageLoaderManager.getInstance(mContext);    }    //设置viewpager中itemd的数量为无限大    @Override    public int getCount() {        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) {        container.removeView((View) object);    }    /**     * 载入图片进去，用当前的position 除以 图片数组长度取余数是关键     */    @Override    public Object instantiateItem(ViewGroup container, int position) {        //数据显示是在0至size-1之间        final RecommandBodyValue value = mData.get(position % mData.size());        View rootView = mInflate.inflate(R.layout.item_hot_product_pager_layout, null);        TextView titleView = (TextView) rootView.findViewById(R.id.title_view);        TextView infoView = (TextView) rootView.findViewById(R.id.info_view);        TextView gonggaoView = (TextView) rootView.findViewById(R.id.gonggao_view);        TextView saleView = (TextView) rootView.findViewById(R.id.sale_num_view);        ImageView[] imageViews = new ImageView[3];        imageViews[0] = (ImageView) rootView.findViewById(R.id.image_one);        imageViews[1] = (ImageView) rootView.findViewById(R.id.image_two);        imageViews[2] = (ImageView) rootView.findViewById(R.id.image_three);        rootView.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Intent intent = new Intent(mContext, CourseDetailActivity.class);                intent.putExtra(CourseDetailActivity.COURSE_ID, value.adid);                mContext.startActivity(intent);            }        });        titleView.setText(value.title);        infoView.setText(value.price);        gonggaoView.setText(value.info);        saleView.setText(value.text);        for (int i = 0; i < imageViews.length; i++) {            mImageLoader.displayImage(imageViews[i], value.url.get(i));        }        container.addView(rootView, 0);        return rootView;    }}

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