1.PagerAdapter {

    public int getCount() {

        return list.size();

    }

    public Object instantiateItem(ViewGroup container, int postion) {

        container.addView(iv);

        return iv;

    }

    public void destroyItem(ViewGroup container, int position, Object object) {

        //super.destroyItem(container, position, object);

        container.removeView((ImageView)object);

    }

    public boolean isViewFromObject(View view, Object object) {        //    判断当前看到的页面是否是通过instantiateItem()返回回来的视图页面

        return view == object;

    }

    public CharSequence getPageTitle(int position) {

        return "tab" + position;        //    PagerTabStrip(ViewPager子布局)

    }

}

2.监听器

OnPageChangeListener {

    public void onPageScrolled(int position, float positionOffSet, int positionOffSetPixels) {}

    public void onPageSelected(int position) {}

    public void onPageScrollStateChanged(int state) {}

}

3.ViewPager里放Fragment两种Adapter

FragmentPagerAdapter {

    public MyFragmentAdapter(FragmentManager fm) {

        super(fm);

    }

    public Fragment getItem(int position) {}

    public int getCount() {}

}

FragmentStatePagerAdapter    只保留3个页面的状态、数据

4.ViewPager的应用

a.在ListView上方展示一个Banner（广告）条，向左右无限滑动

b.ViewPager和ActionBar、RadioGroup、Button的联动

tab.getPosition();

tab.select();

actionBar.getTabAt(position);

 

RadioButton rb = (RadioButton)rg.getChildAt(position);

rg.getChildCount();

c.ViewPager欢迎页.