单击项查看回收器视图

Question

public class MainFragment extends Fragment implements SearchView.OnQueryTextListener {

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

    private static final String[] MOVIES = new String[]{ "One", "Two", "Three" };

    private RecyclerView mRecyclerView;
    private ExampleAdapter mAdapter;
    private List<ExampleModel> mModels;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        final View view = inflater.inflate(R.layout.tms, container, false);

        mRecyclerView = (RecyclerView) view.findViewById(R.id.recycler_view);

        return view;
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        setHasOptionsMenu(true);

        mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));

        mModels = new ArrayList<>();

        for (String movie : MOVIES) {
            mModels.add(new ExampleModel(movie));
        }

        mAdapter = new ExampleAdapter(getActivity(), mModels);
        mRecyclerView.setAdapter(mAdapter);


    }


    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        inflater.inflate(R.menu.search_two, menu);

        final MenuItem item = menu.findItem(R.id.action_search);
        final SearchView searchView = (SearchView) MenuItemCompat.getActionView(item);
        searchView.setOnQueryTextListener(this);
    }

    @Override
    public boolean onQueryTextChange(String query) {
        final List<ExampleModel> filteredModelList = filter(mModels, query);
        mAdapter.animateTo(filteredModelList);
        mRecyclerView.scrollToPosition(0);
        return true;
    }

    @Override
    public boolean onQueryTextSubmit(String query) {
        return false;
    }

    private List<ExampleModel> filter(List<ExampleModel> models, String query) {
        query = query.toLowerCase();

        final List<ExampleModel> filteredModelList = new ArrayList<>();
        for (ExampleModel model : models) {
            final String text = model.getText().toLowerCase();
            if (text.contains(query)) {
                filteredModelList.add(model);
            }
        }
        return filteredModelList;
    }
}

public class ExampleViewHolder extends RecyclerView.ViewHolder {

    private final TextView tvText;

    public ExampleViewHolder(View itemView) {
        super(itemView);

        tvText = (TextView) itemView.findViewById(R.id.tvText);
    }

    public void bind(ExampleModel model) {
        tvText.setText(model.getText());  
    }
}

public class ExampleAdapter extends RecyclerView.Adapter<ExampleViewHolder> {

    private final LayoutInflater mInflater;
    private final List<ExampleModel> mModels;

    public ExampleAdapter(Context context, List<ExampleModel> models) {
        mInflater = LayoutInflater.from(context);
        mModels = new ArrayList<>(models);
    }

    @Override
    public ExampleViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        final View itemView = mInflater.inflate(R.layout.it_file, parent, false);
        return new ExampleViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(ExampleViewHolder holder, int position) {
        final ExampleModel model = mModels.get(position);
        holder.bind(model);
    }

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

    public void animateTo(List<ExampleModel> models) {
        applyAndAnimateRemovals(models);
        applyAndAnimateAdditions(models);
        applyAndAnimateMovedItems(models);
    }

    private void applyAndAnimateRemovals(List<ExampleModel> newModels) {
        for (int i = mModels.size() - 1; i >= 0; i--) {
            final ExampleModel model = mModels.get(i);
            if (!newModels.contains(model)) {
                removeItem(i);
            }
        }
    }

    private void applyAndAnimateAdditions(List<ExampleModel> newModels) {
        for (int i = 0, count = newModels.size(); i < count; i++) {
            final ExampleModel model = newModels.get(i);
            if (!mModels.contains(model)) {
                addItem(i, model);
            }
        }
    }

    private void applyAndAnimateMovedItems(List<ExampleModel> newModels) {
        for (int toPosition = newModels.size() - 1; toPosition >= 0; toPosition--) {
            final ExampleModel model = newModels.get(toPosition);
            final int fromPosition = mModels.indexOf(model);
            if (fromPosition >= 0 && fromPosition != toPosition) {
                moveItem(fromPosition, toPosition);
            }
        }
    }

    public ExampleModel removeItem(int position) {
        final ExampleModel model = mModels.remove(position);
        notifyItemRemoved(position);
        return model;
    }

    public void addItem(int position, ExampleModel model) {
        mModels.add(position, model);
        notifyItemInserted(position);
    }

    public void moveItem(int fromPosition, int toPosition) {
        final ExampleModel model = mModels.remove(fromPosition);
        mModels.add(toPosition, model);
        notifyItemMoved(fromPosition, toPosition);
    }
}

如果用户点击一个，我希望它做一些事情，也为两个和三个。我如何实现这一点？

Answer 1

MainActivity.java

public interface ClickListener {
    void onClick(View view, int position);
    void onLongClick(View view, int position);
}

public static class RecyclerTouchListener implements RecyclerView.OnItemTouchListener {

    private GestureDetector gestureDetector;
    private MainActivity.ClickListener clickListener;

    public RecyclerTouchListener(Context context, final RecyclerView recyclerView, final MainActivity.ClickListener clickListener) {
        this.clickListener = clickListener;
        gestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
            @Override
            public boolean onSingleTapUp(MotionEvent e) {
                return true;
            }

            @Override
            public void onLongPress(MotionEvent e) {
                View child = recyclerView.findChildViewUnder(e.getX(), e.getY());
                if (child != null && clickListener != null) {
                    clickListener.onLongClick(child, recyclerView.getChildPosition(child));
                }
            }
        });
    }

    @Override
    public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {

        View child = rv.findChildViewUnder(e.getX(), e.getY());
        if (child != null && clickListener != null && gestureDetector.onTouchEvent(e)) {
            clickListener.onClick(child, rv.getChildPosition(child));
        }
        return false;
    }

    @Override
    public void onTouchEvent(RecyclerView rv, MotionEvent e) {
    }

    @Override
    public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {

    }
}

和

recyclerView.addOnItemTouchListener(new  RecyclerTouchListener(getApplicationContext(), recyclerView, new ClickListener() {
    @Override
    public void onClick(View view, int position) {
        Movie movie = movieList.get(position);
        Toast.makeText(getApplicationContext(), movie.getTitle() + " is selected!", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onLongClick(View view, int position) {
    }
}));

您必须创建一个界面，并使用GestureDetector来检测视图是否已被单击！