如何在Android RecyclerView中删除项目

Question

一项任务： 当您单击RecyclerView元素时，该项目将被删除。

MainActivity.java

    public class MainActivity extends AppCompatActivity  implements MultipleAdapter.OnItemClickListener{


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

    }

    @Override
    public void onItemClick(int position) {
        // Here we can get the item's position in RecyclerView
        Toast.makeText(this, "Position: " + position, Toast.LENGTH_SHORT).show();
    }
}

MultipleAdapter.java

    public class MultipleAdapter extends RecyclerView.Adapter{

    private List<RowType> dataSet;

    OnItemClickListener mListener;

    public MultipleAdapter(List<RowType> dataSet) {
        this.dataSet = dataSet;
    }

    @Override
    public int getItemViewType(int position) {
        // SOME CODE
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        // SOME CODE
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        if(holder instanceof CountryHolder){
            ((CountryHolder) holder).mName
                    .setText(((CountryBase) dataSet.get(position)).getName());
        }
    }

    @Override
    public int getItemCount() {
        return dataSet.size();
    }

    public void setListener(OnItemClickListener listener) {
        mListener = listener;
    }

    public static class CountryHolder extends RecyclerView.ViewHolder{
        public TextView mName;
        public TextView mPopulation;

        public CountryHolder(View itemView) {
            super(itemView);
            mName = itemView.findViewById(R.id.tv_name);               
        }

        public void setListener(final OnItemClickListener mListener) {
            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    mListener.onItemClick(getLayoutPosition());
                }
            });
        }
    }

    public static class FlagHolder extends RecyclerView.ViewHolder{
        // SOME CODE (COPY CountryHolder)
    }

    public interface OnItemClickListener{
        void onItemClick(int position);
    }
}

RecyclerFragment.java

    public class RecyclerFragment extends Fragment{

    Toolbar toolbar;
    RecyclerView recyclerView;
    MultipleAdapter adapter;
    List<RowType> items = new ArrayList<>();
    CountryGenerator cG = new CountryGenerator();
    MultipleAdapter.OnItemClickListener mListener;

    public static RecyclerFragment newInstance() {
        return new RecyclerFragment();
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_recycler, container, false);
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        recyclerView = view.findViewById(R.id.recycler);

        items.add(new CountryBase(cG.generatorCountryName(), cG.generatorCountryPopulation()));
        items.add(new FlagBase("MultiFLAG"));

        recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
        adapter = new MultipleAdapter(items);
        recyclerView.setAdapter(adapter);
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        adapter.setListener(mListener);
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        // SOME CODE
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // SOME CODE
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if(context instanceof MultipleAdapter.OnItemClickListener){
            mListener = (MultipleAdapter.OnItemClickListener) context;
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }
}

收到MainActivity.java中的职位后，我在RecyclerFragment.java removeItem(int position);中创建了方法，但是当我在MainActivity.java中应用此方法时，该应用程序被删除。 我能以某种简单的方式处理单击元素吗？如果您能帮助我理解此代码中的错误，将不胜感激。