型片段的方法，必须重写或实现超方法

Question

我得到一个编译时错误The method getLastCustomNonConfigurationInstance() of type TopRatedFragment must override or implement a supertype method

TopRatedFragment.java：

public class TopRatedFragment extends Fragment { 

    private CurlView mCurlView; 


    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
      Bundle savedInstanceState) { 

     View rootView = inflater.inflate(R.layout.fragment_top_rated, container, false); 

     int index = 0; 
     if (getLastCustomNonConfigurationInstance() != null) { 
      index = (Integer) getLastCustomNonConfigurationInstance(); 
     } 

     mCurlView = (CurlView)rootView.findViewById(R.id.curl); 
     mCurlView.setPageProvider(new PageProvider()); 
     mCurlView.setSizeChangedObserver(new SizeChangedObserver()); 
     mCurlView.setCurrentIndex(index); 
     mCurlView.setBackgroundColor(0xFF202830); 



     return rootView; 
    } 

    @Override 
    public Object getLastCustomNonConfigurationInstance() { ---> getting compile error 
     return mCurlView.getCurrentIndex(); 
    } 

我做的动作栏选项卡的页面卷曲所以我只是将FragmentActivity代码传递给Fragment。 getLastCustomNonConfigurationInstance()方法属于FragmentActivity.Thats为什么我得到错误。

我不知道如何以正确的方式解决这个错误。任何人都可以帮助我解决这个问题。

编辑︰我明确需要该方法。顺便说一句如果删除覆盖，然后在运行时得到空指针异常。

Answer 1

将配置方法及其调用保留在FragmentActivity中，并创建一个接口来在Fragment中获取/设置索引。

在Fragment：

public class TopRatedFragment extends Fragment 
{ 
    public interface ISettings 
    { 
     public int getIndex(); 
     public void setIndex(int index); 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) 
    { 
     ... 
     int index = ((ISettings) getActivity()).getIndex(); 
     ... 
    } 
    ... 
} 

而在FragmentActivity：事情我可以对我自己

public class MainActivity extends FragmentActivity 
    implements TopRatedFragment.ISettings 
{ 
    private int mCurlViewIndex = 0; 

    @Override 
    public int getIndex() 
    { 
     return mCurlViewIndex; 
    } 

    @Override 
    public void setIndex(int index) 
    { 
     mCurlViewIndex = index; 
    } 

    @Override 
    public void onCreate(Bundle savedInstanceState) 
    { 
     ... 
     if (getLastCustomNonConfigurationInstance() != null) 
     { 
      mCurlViewIndex = (Integer) getLastCustomNonConfigurationInstance(); 
     } 
     ... 
    } 
    ... 
}