android FragmentPagerAdapter的“标准”配置

private class ImagePagerAdapter extends FragmentPagerAdapter {

public List<ImageItem> fileList;

public ImagePagerAdapter(FragmentManager fm, List<ImageItem> fileList) {
super(fm);
this.fileList = fileList;
}

@Override
public int getCount() {
return fileList == null ? 0 : fileList.size();
}
@Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
@Override
public boolean isViewFromObject(View view, Object obj) {
return view == ((Fragment) obj).getView();
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
Fragment fragment = ((Fragment) object);
container.removeView(fragment.getView());
FragmentUtils.removeFragmentRecently(getSupportFragmentManager(), fragment);
}
@Override
public Fragment getItem(int position) {
String url = fileList.get(position).getActualUrl();
return ImageDetailFragment.newInstance(url);
}

}