无法从片段内的静态上下文引用自定义适配器

Question

我正在尝试使用自定义适配器填充列表视图，但我得到了 以下错误“App.this无法从静态上下文引用”。

问题不在于“getActivity（）”，而是从静态上下文调用CustomAdapter本身。这样做的正确方法是什么？

public class App extends Activity {

   @Override
   protected void onCreate(Bundle savedInstanceState) {
   //
   }

   static public class PlanetFragment extends Fragment {
       ListView lv;
       String planet=null;

       public PlanetFragment() {
        // Empty constructor required for fragment subclasses
       } 



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

           lv.setAdapter(new CustomAdapter(getActivity(), savedInstanceState, planet));

       }



       @Override
       public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             final Bundle savedInstanceState) {
           View rootView = inflater.inflate(R.layout.fragment_planet, container, false);
           lv = (ListView) rootView.findViewById(R.id.list);
           }
        }
      }

   class CustomAdapter extends BaseAdapter
   {

   //Some access to context and operations etc is done to populate the rows

   }
}