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

时间:2019-06-22 08:36:30

标签: android android-recyclerview

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传递给我 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);

    }
}

3 个答案:

答案 0 :(得分:2)

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,您需要在适配器中创建interface,并在本地mClickListener中声明它,并在ViewHolder类和setonclick中创建viewholder的地方实现它:

    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);
    }

请注意,我将其设置在button上,但是您可以将其设置在itemView上 也可以在任何具有view的{​​{1}}上使用,因此您可以使用:

setOnClickListener

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itemView.setOnClickListener(this); onlick,并在初始化适配器后,使用我们在适配器中创建的interface的方法即可适配器中的界面

public void setClickListener

活动:

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

和活动public class ChildrenEditDialog extends Dialog implements IChildren.IView, ChildrenRvAdapter.ItemClickListener 或其他地方:

onCreate

您的活动/片段/对话/等中有onlcick ...

答案 1 :(得分:1)

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

答案 2 :(得分:0)

要获取onBindViewHolder的当前位置,可以使用ViewHolder类getAdapterPosition()

例如,

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();
        });

    }
}