Question

我有一个包含项目列表的主片段，点击一个项目，我在一个新片段中打开项目的详细视图

使用

transaction.replace(R.id.container, FeedDetail.newInstance(title, position)).commit();

详细片段包含FragmentStatePagerAdapter以显示项目的滑动列表。一切正常，但项目的主要列表在后台更新（AsyncTask）。在详细视图中滑动项目时，我得到了

java.lang.IllegalStateException：应用程序的PagerAdapter 无需调用就更改了适配器的内容 PagerAdapter＃notifyDataSetChanged！预期的适配器项目数：30，发现：40寻呼机身份

我正确地从onPostExecute（）调用adapter.notifyDataSetChanged（），仍无法解决此问题。我想这个问题可能与此处共享http://translate.google.co.in/translate?hl=en&sl=zh-CN&u=http://blog.csdn.net/hlglinglong/article/details/34845519&prev=search类似，但不确定。我尝试使用适配器的getItemPosition（）中的不同值，但没有成功。在这个问题上得到一些暗示会很好。我在这里粘贴详细的片段代码以供参考，

public class FeedDetail extends Fragment {
    private ViewPager mPager = null;
    private PagerAdapter mPagerAdapter;
    private OnFragmentInteractionListener mListener;
    private FragmentActivity myContext;
    public static String title;
    public  static Integer pos;
    private LayoutInflater mInflater;
    private View  mRootView = null;
    ViewGroup mViewGroup = null;
    public static FeedDetail newInstance(String title,  int pos) {
        FeedDetail fragment = new FeedDetail();
        Bundle args = new Bundle();
        args.putString("title", title);
        args.putInt("pos", pos);
        fragment.setArguments(args);
        return fragment;
    }
    public FeedDetail() {
        // Required empty public constructor
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            title = getArguments().getString("title");            
            pos = getArguments().getInt("pos");
        }
    }


    @Override
    public void onDestroyView()
    {
        super.onDestroyView();
        ViewGroup parentViewGroup = (ViewGroup) mRootView.getParent();
        if( null != parentViewGroup ) {
            parentViewGroup.removeAllViews();
        }
        mViewGroup.removeAllViews();
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        mViewGroup = container;
        if (mRootView == null) {
            mRootView = (View) inflater.inflate(R.layout.feedpager, null, false);
        }
        else {
            ViewGroup parent = (ViewGroup) mRootView.getParent();
            parent.removeView(mRootView);
        }
        mPager = (ViewPager) mRootView.findViewById(R.id.pager);
        mPagerAdapter = new ScreenSlidePagerAdapter(getChildFragmentManager());
        mPager.setAdapter(mPagerAdapter);
        mPager.setCurrentItem(pos);
        mRootView.setFocusableInTouchMode(true);
        mRootView.requestFocus();
        return  mRootView;
    }




    @Override
    public void onAttach(Activity activity) {
        myContext=(FragmentActivity) activity;
        super.onAttach(activity);
    }


    @Override
    public void onDetach() {
        super.onDetach();

        try {
            Field childFragmentManager = Fragment.class.getDeclaredField("mChildFragmentManager");
            childFragmentManager.setAccessible(true);
            childFragmentManager.set(this, null);

        } catch (NoSuchFieldException e) {
            throw new RuntimeException(e);
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        }
    }
    public static interface OnFragmentInteractionListener {
        public void onFragmentInteraction(Uri uri);
    }

    private class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter{
        public ScreenSlidePagerAdapter(FragmentManager fm) {
            super(fm);
            setRetainInstance(true);
        }

        @Override
        public Fragment getItem(int position) {
            return ScreenSlidePageFragment.newInstance(position);
        }

        @Override
        public int getItemPosition(Object object) {
            return 1;
        }

        @Override
        public int getCount() {
            return Navigation.adapter.getCount();
        }

        @Override
        public CharSequence getPageTitle(int position) {
            return Navigation.adapter.getFeeds().get(position).title;

        }
    }
}

具有动态数据的FragmentStatePagerAdapter，IllegalStateException

0 个答案: