RecyclerView-如何将onBindViewHolder的位置传递给ViewHolder类？

Question

我正在尝试在ViewHolder类中设置onClickListeners，但是我需要每个位置。 如何将位置从onBindViewHolder传递给ViewHolder类？

@NonNull
@Override
public AdapterAllComments.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
    View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.model_rv_allcomments_container, viewGroup, false);

    return new ViewHolder(view);
}

@Override
public void onBindViewHolder(@NonNull AdapterAllComments.ViewHolder viewHolder, int position) {


}

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

public class ViewHolder extends RecyclerView.ViewHolder{



    LinearLayout viewHolderLayout;


    public ViewHolder(@NonNull View itemView) {
        super(itemView);

        viewHolderLayout = itemView.findViewById(R.id.item_child_layout);

    }
}

Answer 1

这个适配器来自我的其他项目：

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

    private List<String> mData;
    private LayoutInflater mInflater;
    private ItemClickListener mClickListener;
    private Context context;

    public ChildrenRvAdapter(Context context, List<String> data) {
        this.mInflater = LayoutInflater.from(context);
        this.mData = data;
        this.context = context;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = mInflater.inflate(R.layout.children_rv_row, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        String name = mData.get(position);
        holder.tv_name.setText(name);
        setAnimation(holder.itemView, position);
    }

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

    public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
        TextView tv_name;
        Button btn_remove;

        ViewHolder(View itemView) {
            super(itemView);
            tv_name = itemView.findViewById(R.id.tv_name);
            btn_remove = itemView.findViewById(R.id.btn_remove);
            btn_remove.setOnClickListener(this);
        }

        @Override
        public void onClick(View view) {
            if (mClickListener != null) mClickListener.onItemClick(view, getAdapterPosition());
        }
    }

    String getItem(int id) {
        return mData.get(id);
    }

    public void setClickListener(ItemClickListener itemClickListener) {
        this.mClickListener = itemClickListener;
    }

    public interface ItemClickListener {
        void onItemClick(View view, int position);
    }

    }
}

因此，您可以在适配器中创建interface ，还可以在本地mClickListener声明interface ，并在ViewHolder类和setonclick在创建setonclick位置进行viewholder ：

    ViewHolder(View itemView) {
        super(itemView);
        tv_name = itemView.findViewById(R.id.tv_name);
        btn_remove = itemView.findViewById(R.id.btn_remove);
        btn_remove.setOnClickListener(this);
    }

只是请注意，我把它放在一个button但你可以把它放在itemView还上的任何view认为有setOnClickListener所以你可以使用：

itemView.setOnClickListener(this);

然后从您的活动或片段以及无论使用适配器的任何地方，只需实现onlick interface并在初始化适配器后，使用我们在适配器中创建public void setClickListener onlick的方法，即可到适配器的本地接口

 public void setClickListener(ItemClickListener itemClickListener) {
    this.mClickListener = itemClickListener;
}

活动：

public class ChildrenEditDialog extends Dialog implements IChildren.IView, ChildrenRvAdapter.ItemClickListener

在活动onCreate或其他地方：

 childrenRvAdapter = new ChildrenRvAdapter(c, dataSource);
    childrenRvAdapter.setClickListener(this);

并且您的活动/片段/对话/等中有onlcick ...

Answer 2

使用ViewHolders getAdapterPosition()获取ViewHolder的当前位置。

Answer 3

要将onBindViewHolder的当前位置获取到ViewHolder类，可以使用getAdapterPosition() 。

举个例子，

public class ViewHolder extends RecyclerView.ViewHolder{
    LinearLayout viewHolderLayout;

    viewHolderLayout = itemView.findViewById(R.id.item_child_layout);

    public ViewHolder(@NonNull View itemView) {
        super(itemView);

        viewHolderLayout.setOnClickListener(v -> {
            lastClickedPosition = getAdapterPosition();
        });

    }
}