RecyclerView 适配器中的 onClickListener？

Question

我想在我的 RecyclerView 适配器中设置一个 onClickListener，这样我就可以轻松地参考其他视图来检索它们的标签。

是否可以在 RecyclerView 适配器中设置 onClickListener？我该怎么做？会影响性能吗？

这是我的 RecyclerView 适配器：

public class PostRecyclerAdapter extends RecyclerView.Adapter<PostRecyclerAdapter.ViewHolder> {

    private Context context;
    private List<Post> mDataset;

    public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnCreateContextMenuListener {
        public LinearLayout mainLayout;
        public TextView username;
        public ImageView image;

        public ViewHolder(LinearLayout view) {
            super(view);
            view.setOnCreateContextMenuListener(this);

            mainLayout = (LinearLayout) view.findViewById(R.id.main_view);
            username = (TextView) view.findViewById(R.id.username);
            image = (ImageView) view.findViewById(R.id.image);
        }
    }

    public PostRecyclerAdapter(Context context, List<Post> myDataset) {
        this.context = context;
        this.mDataset = myDataset;
    }

    @Override
    public PostRecyclerAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.post_layout, parent, false);
        ViewHolder vh = new ViewHolder((LinearLayout) view);

        return vh;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        Post postItem = mDataset.get(position);

        holder.username.setText(postItem.getUserame());
    }

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

}

Answer 1

我想提出一种比上面给出的方法更简单的方法。 在您的适配器中，您将为此编写静态视图持有者类，添加以下代码

public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
       // your views declared here           
        CardView cardView;

        public ViewHolder(View itemView) {
            super(itemView);                
           // your view initialised here
              cardView=itemView.findViewById(R.id.card_view);
              cardView.setOnClickListener(this);
        }

        @Override
        public void onClick(View v) {
            switch (v.getId()){
                case R.id.card_view:
                    // your logic
                break;
            }
        }
    }

通过这样做，您可以处理布局的单个点击以及整个布局的点击

Answer 2

您可以为此使用 GestureDetector。这使用起来非常简单：

创建一个类 RecyclerTouchListener ：

public class RecyclerTouchListener implements RecyclerView.OnItemTouchListener {

    private GestureDetector gestureDetector;
    private ClickListener clickListener;

    public RecyclerTouchListener(Context context, final RecyclerView recyclerView, final 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.getChildAdapterPosition(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) {

    }


    public interface ClickListener {

        void onClick(View view, int position);

        void onLongClick(View view, int position);
    }

}

你可以像下面这样使用这个类：

rvFilterOptions = (RecyclerView) rootView.findViewById(R.id.rvCommon);
        rvFilterOptions.setHasFixedSize(true);
        rvFilterOptions.addItemDecoration(new DividerItemDecoration(getActivity(),
                DividerItemDecoration.VERTICAL_LIST));
        LinearLayoutManager mLayoutManager = new LinearLayoutManager(getActivity());
        rvFilterOptions.setLayoutManager(mLayoutManager);


        rvFilterOptions.addOnItemTouchListener(new RecyclerTouchListener(getActivity(), rvFilterOptions, new RecyclerTouchListener.ClickListener() {
            @Override
            public void onClick(View view, int position) {

// Perform click operation  and you can get post item from array using position
            }

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

// Perform Long click operation 
            }
        }));

注意：概念取自LINK

Answer 3

这是最简单的实现，但这将在 recyclerviews 适配器中。如果您想在活动中获取行项点击侦听器，请使用接口。

public class PostRecyclerAdapter extends RecyclerView.Adapter<PostRecyclerAdapter.ViewHolder> {

    private Context context;
    private List<Post> mDataset;

    public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnCreateContextMenuListener {
        public LinearLayout mainLayout;
        public TextView username;
        public ImageView image;
        public View mRowItem;   

        public ViewHolder(LinearLayout view) {
            super(view);
            view.setOnCreateContextMenuListener(this);
            mRowItem = view;
            mainLayout = (LinearLayout) view.findViewById(R.id.main_view);
            username = (TextView) view.findViewById(R.id.username);
            image = (ImageView) view.findViewById(R.id.image);
        }
    }

    public PostRecyclerAdapter(Context context, List<Post> myDataset) {
        this.context = context;
        this.mDataset = myDataset;
    }

    @Override
    public PostRecyclerAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.post_layout, parent, false);
        ViewHolder vh = new ViewHolder((LinearLayout) view);


        return vh;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        Post postItem = mDataset.get(position);

        holder.username.setText(postItem.getUserame());

        //Whole row item
        holder.mRowItem.setTag(position);
        holder.mRowItem.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                  int pos = (int) v.getTag();
                  // handle your row item click.
              }
           });

    }

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

}