ViewPager 简单实现左右无限滑动.

只需在在适配器中将getCount 给一个较大的值, 然后将currentItem 设为值的一半 就可以伪实现 无限循环.

  private static final int PAGE_COUNT = 600;

    class MyPagerAdapter extends PagerAdapter {

        @Override
        public int getCount() {
            return PAGE_COUNT;
        }

        @Override
        public void notifyDataSetChanged() {
            super.notifyDataSetChanged();
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
//            container.removeView(viewList.get(position % viewList.size()));
        }

        @Override
        public Object instantiateItem(ViewGroup container, final int position) {
            ImageView imageView = viewList.get(position % viewList.size());
            try {
                container.addView(imageView);
            } catch (Exception e) {

            }
            imageView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Intent intent = new Intent(MainActivity.this, NewsDetailActivity.class);
                    intent.putExtra("subject", topList.get(position % viewList.size()));
                    startActivity(intent);
                }
            });
            return imageView;
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == object;
        }
    }