在另一个Viewpager内部的Viewpager中未调用片段setUserVisibleHint

Question

我有一个有4个选项卡的ViewPager片段，在第4个选项卡中有另一个有3个选项卡的ViewPager，这样，如果每当我切换我的topviewPagerTab（一个有4个选项卡）时，就不会调用sub ViewPager（有3个选项卡）中的setUserVisiblehint片段。

boolean isPageVisible = false;

@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
    super.setUserVisibleHint(isVisibleToUser);
    isPageVisible = isVisibleToUser;
}

Answer 1

public class UserAdapter extends FragmentPagerAdapter
{
    private ArrayList<Fragment> fragments;

    public UserAdapter(FragmentManager fm, ArrayList<Fragment> fragments)
    {
        super(fm);
        this.fragments = fragments;
    }

    public void clearFragment()
    {
        fragments.clear();
    }

    @Override
    public Fragment getItem(int position) {
        return fragments.get(position);
    }

    @Override
    public int getCount() {
        return fragments.size();
    }


    public void setUserVisibleHint(boolean isUserVisibleHint)
    {
        if(viewPagerPojos != null && viewPagerPojos.size() > 0)
        {
            for(ViewPagerPojo viewPagerPojo : viewPagerPojos)
            {
                viewPagerPojo.getFragment().setUserVisibleHint(isUserVisibleHint);
            }
        }
    }

}

在每一个片段里

@Override
public void setUserVisibleHint(boolean isVisible) {
    super.setUserVisibleHint(isVisible);
    if (mAdaptor != null) {
     mAdaptor.setUserVisibleHint(isVisible);
    }
}

在子片段中

boolean isPageVisible;

@Override
public void setUserVisibleHint(boolean isVisibleHint) 
{
    isPageVisible = this.isVisible() && isVisibleHint;
    super.setUserVisibleHint(isPageVisible);
}