在SherlockFragment中刷新Gridview

Question

我正在尝试刷新我在SherlockFragment中的Gridview图像。

我写了一个接口来更新适配器。但是当我尝试使用自定义覆盖接口（onCardTypeSelected）方法调用它时，所有视图都抛出NullPointerException。

我最好的尝试了我的水平。无法找到解决方案。需要一些帮助 以下是我的代码段。

 public class PhotosFragment extends SherlockFragment implements CardSelectionInterface {
    private Integer[] mThumbIds = {
            R.drawable.thumb_card1,
            R.drawable.thumb_card2,
            R.drawable.thumb_card3,
            R.drawable.thumb_card4
    };
     View view;
     GridView gridView;  
     String[] cardTypes;
     Context context;
     public static PhotoImageAdapter photoImageAdapter;

     @Override
        public View onCreateView (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            view = inflater.inflate(R.layout.photos_layout,container,false);
            gridView = (GridView) view.findViewById(R.id.photogridview);
            context = view.getContext();
            photoImageAdapter = new PhotoImageAdapter(context, mThumbIds);
            gridView.setAdapter(photoImageAdapter); // uses the view to get the context instead of getActivity().

            cardTypes = getResources().getStringArray(R.array.card_types);

            gridView.setOnItemClickListener(new OnItemClickListener() {

                @Override
                public void onItemClick(AdapterView<?> arg0, View arg1,
                        int position, long arg3) {
                    System.out.println("*** Clicked : " + position);
                }
            });
            System.out.println("Returning view");
            return view;
        }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        System.out.println("On Activity created");
    }

    @Override
    public void onPause() {
        super.onPause();
    }

    @Override
    public void onCardTypeSelected(TypedArray typedArrayImages) {
        mThumbIds = new Integer[typedArrayImages.length()];
        for (int i = 0; i < typedArrayImages.length(); i++) 
            mThumbIds[i] = typedArrayImages.getResourceId(i, -1);
        this.photoImageAdapter.notifyDataSetChanged();
}



    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        System.out.println("OnAttach");
    }

}