viewpager+fragment 防止fragment重新加载

mViewPager.setOffscreenPageLimit(categoryList.size());
mViewPager.setAdapter(new VPAdapter(getSupportFragmentManager(), categoryList));

new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

}

@Override
public void onPageSelected(int position) {
VideosListFragment fragment = (VideosListFragment) mViewPager.getAdapter().instantiateItem(mViewPager, position);
fragment.onPageSelected(position, categoryList.get(position).getName());
}

@Override
public void onPageScrollStateChanged(int state) {

}

在VPAdapter中不初始化item，由ViewPager.OnPageChangeListener每次只初始化当前fragment，而加载过的fragment再次选中不会重新加载