RecyclerView.ViewHolder中的onClickListener

Question

我有一个RecyclerView.ViewHolder和RecyclerView.Adapter,我需要在点击项目后,然后将有关此项目的信息发送给另一个Activity.

PlacesAdapter.java

public class PlacesAdapter extends RecyclerView.Adapter<PlacesViewHolder> {
private PlacesActivity placesActivity;

    Context context;
    private int position;
    List<Places> places;

    public PlacesAdapter(List<Places> places) {
        this.places = places;}

    @Override
    public void onAttachedToRecyclerView(RecyclerView recyclerView) {
        super.onAttachedToRecyclerView(recyclerView);
    }

    @Override
    public PlacesViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.places_view, viewGroup, false);
        PlacesViewHolder pvh = new PlacesViewHolder(v);
        return pvh;
    }

    @Override
    public void onBindViewHolder(PlacesViewHolder personViewHolder, int i) {
        personViewHolder.name.setText(places.get(i).name);
        personViewHolder.address.setText(places.get(i).address);
        Picasso.with(personViewHolder.itemView.getContext())
                .load(places.get(i).photo)
                .into(personViewHolder.getPhoto());
       }

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

}

PlacesViewHolder.java

在这一行"intent.putExtra(PlacesDetail.PLACES_NAME,);"我如何发送姓名？

 public  class PlacesViewHolder extends RecyclerView.ViewHolder {

    CardView cv;
    public TextView name;
    public TextView address;
    public ImageView photo;
    public PlacesViewHolder(final View itemView) {
        super(itemView);
        cv = (CardView)itemView.findViewById(R.id.cv);
        name = (TextView)itemView.findViewById(R.id.person_name);
        address = (TextView)itemView.findViewById(R.id.person_age);
        photo = (ImageView)itemView.findViewById(R.id.person_photo);

        itemView.setOnClickListener(new View.OnClickListener(){

            @Override
            public void onClick(View v) {
                Context context = v.getContext();
                Intent intent = new Intent(context, PlacesDetail.class);
                intent.putExtra(PlacesDetail.PLACES_NAME,);
                context.startActivity(intent);
            }
        });

    }

    public TextView getAddress() {
        return address;
    }

    public TextView getName() {
        return name;
    }
    public ImageView getPhoto() {
        return photo;
    }
}

Answer 1

您可以通过在适配器内创建一个接口来实现此目的itemclicklistener，然后您可以onItemClickListener从您的PlacesActivity.

在你内心的某个地方，PlacesAdapter你需要以下内容：

private onRecyclerViewItemClickListener mItemClickListener;

 public void setOnItemClickListener(onRecyclerViewItemClickListener mItemClickListener) {
        this.mItemClickListener = mItemClickListener;
    }

    public interface onRecyclerViewItemClickListener {
        void onItemClickListener(View view, int position, String places_name);
    }

然后在您的ViewHolder（我已将其作为适配器中的内部类添加）内部，您可以将侦听器应用到您希望用户单击的组件，如下所示：

class PlacesViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
        PlacesViewHolder(View view) {
            super(view);
            view.setOnClickListener(this);
        }

        @Override
        public void onClick(View v) {
            if (mItemClickListener != null) {
                mItemClickListener.onItemClickListener(v, getAdapterPosition(), PlacesDetail.PLACES_NAME);
            }
        }
    }

这个例子展示了一个onClickListener被应用到里面的视图PlacesViewHolder。

recyclerView.setAdapter(adapter);// set adapter on recyclerview
            adapter.notifyDataSetChanged();// Notify the adapter
            adapter.setOnItemClickListener(new PlacesAdapter.onRecyclerViewItemClickListener() {
                @Override
                public void onItemClickListener(View view, int position, String places_name) { 
//perform click logic here (places_name is passed)
                    }
                });

要实现此代码，您需要setOnItemClickListener将适配器添加到内部PlacesActivity，如上所示。