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我想在横向和纵向模式下运行我的应用程序。我已经使用ViewPager并将FragmentPagerAdapter在您滑动列表时分离每个片段，但将它们保留在内存中，以便在用户向后滑动时可以简单地重新连接它们。它在纵向模式下正常工作。但是当它进入横向模式时，当我交换屏幕时它只显示第一个片段视图。请给我解决方案。

片段适配器：

public class FragmentAdapter extends FragmentStatePagerAdapter
{
    private final int three = 3 ;

    public FragmentAdapter(FragmentManager fm)
    {       
        super(fm);
        Log.e("adapter", "const");
    }

    @Override
    public Fragment getItem(int position)
    {
        Log.e("adapter", "getitem");
        return ViewFragment.newInstance(position);  
    }

    @Override
    public int getCount()
    {
        Log.v("adpt", "getcount");
        return three;
    }
}

视图片段：

public final class ViewFragment extends Fragment
{
    private int position;
    public static ViewFragment newInstance(int position)
    {
        ViewFragment viewFragment = new ViewFragment();
        viewFragment.position = position;
        Log.e("newinstance", "pos="+position);

        return viewFragment;
    }

     @Override  
     public void onCreate(Bundle savedInstanceState)
     {  
         super.onCreate(savedInstanceState);  
     } 

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) 
    {
        Log.d("oncreateview", ":)");

        View view = null ;

        if (position == 0)
        {
            Log.e("oncreateview", "0/"+position);
            View v = inflater.inflate(R.layout.first_view_fragment, null) ;
            view = v.findViewById(R.id.firstViewFragmentLayout);

        }
        else if (position == 1 )
        {
            Log.e("oncreateview", "1/"+position);
            View v = inflater.inflate(R.layout.second_view_fragment, null) ;
            view = v.findViewById(R.id.secondViewFragmentLayout);

        }
        else if (position == 2)
        {
            Log.e("oncreateviewr", "2/"+position);
            View v = inflater.inflate(R.layout.third_view_fragment, null) ;
            view = v.findViewById(R.id.thirdViewFragmentLayout);
        }

        return view;
    }
}
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