RecyclerView notifydatasetchanged 未從片段調用

Question

我有一個家庭活動和 3 個子片段，在家庭活動中，我被調用了一個 api，然后我想將結果更新到片段中包含的回收器視圖。 現在除了 notifydatasetchanged() 之外的所有內容都運行良好。

你有任何關於片段的想法，請幫助我。

家庭活動.java

      // member variable for the first fragment

         private FeedsFragment feedsFragment;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);
    // initialised in oncreate    
        feedsFragment = new FeedsFragment();

    }

        private void setupViewPager(ViewPager viewPager) {
        ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
        adapter.addFragment(feedsFragment, "FEEDS");
}

// this is what i am called when get the api result
feedsFragment.setUpdateArrayList(updateArrayList);

FeedsFragment.java

    public class FeedsFragment extends Fragment {

        private RecyclerView recyclerView;
        private UpdateListAdapter uAdapter;
        private ArrayList<Updates> updateArrayList;
        private String TAG = UpdatesActivity.class.getSimpleName();

        public FeedsFragment() {
            // Required empty public constructor


        }

        @Override
        public void onCreate(Bundle savedInstanceState) {

            super.onCreate(savedInstanceState);
        }


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

        }

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

            updateArrayList = new ArrayList<Updates>();

            View thisView = inflater.inflate(R.layout.activity_updates, container, false);

            recyclerView = (RecyclerView) thisView.findViewById(R.id.recycler_view_updates);

            uAdapter = new UpdateListAdapter(getActivity(), updateArrayList, new UpdateListAdapter.UpdatesActionListener() {
                @Override
                public void onShareButtonTapped(int position) {

                }

                @Override
                public void onOptionsButtonTapped(int position, View v) {

                }

                @Override
                public void onProfileButtonTapped(int position) {

                }
            });

            LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());

            recyclerView.setLayoutManager(layoutManager);
            recyclerView.setItemAnimator(new DefaultItemAnimator());
            recyclerView.setAdapter(uAdapter);


            return thisView;
        }


        public void setUpdateArrayList(ArrayList<Updates> array){

            this.updateArrayList = array;
            this.recyclerView.getAdapter().notifyDataSetChanged();

//Also tried 
// uAdapter.notifyDataSetChanged();



        }

    }

Answer 1

問題是您更改了片段中的updateArrayList而不是適配器中的列表。

您可以在UpdateListAdapter添加一個 api 作為

public void setData(List<Updates> data){...}

然后調用該API setUpdateArrayList致電前notifyDataSetChanged 。

Answer 2

謝謝支持，問題暫時通過重新初始化upadadatelistadapter解決

    public void setUpdateArrayList(ArrayList<Updates> array){

        this.updateArrayList = array;

       ********** <Reinitialized the adapter here >**********

        this.recyclerView.getAdapter().notifyDataSetChanged();


    }