如何使用 gridlayout 设置 OnClick android cardview 示例

Question

我有一个 Android 项目来创建可以单击的网格布局项。我对设置 On Click 侦听器的位置以及代码的外观感到困惑。这是我的适配器代码程序：

public class MyAdapter extends RecyclerView.Adapter <FruitViewHolder> {

    private Context mContext;
    private List< FruitsData > mFruitList;

    MyAdapter(Context mContext, List< FruitsData > mFruitList) {
        this.mContext = mContext;
        this.mFruitList = mFruitList;
    }

    @Override
    public FruitViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View mView = LayoutInflater.from(parent.getContext()).inflate(R.layout.recyclerview_item_row, parent, false);
        return new FruitViewHolder(mView);

    }

    @Override
    public void onBindViewHolder(final FruitViewHolder holder, int position) {
        holder.mImage.setImageResource(mFruitList.get(position).getFruitImage());
        holder.mTitle.setText(mFruitList.get(position).getFruitName());


    }

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

class FruitViewHolder extends RecyclerView.ViewHolder {

    ImageView mImage;
    TextView mTitle;

    FruitViewHolder(View itemView) {
        super(itemView);

        mImage = itemView.findViewById(R.id.ivImage);
        mTitle = itemView.findViewById(R.id.tvTitle);


    }
}

感谢您的关注..

Answer 1

基本上你必须执行以下步骤：

1. 定义一个 ClickListener 接口

   public interface OnItemClickListener {
     void onItemClick(FruitsData item);
   }
   

2. 将 ClickListener 传递给适配器的构造函数

   MyAdapter(Context mContext, List<FruitsData > mFruitList, OnItemClickListener listener) {
       this.mContext = mContext;
       this.mFruitList = mFruitList;
       this.listener = listener;
    }
   

3. 然后为监听器创建一个setter

   public void setListener(OnItemClickListener listener) {
     this.listener=listener;
   }
   
   //and ease your constructor
   

4. 为你的 viewHolder 设置一个 onClickListener 并调用你的监听器

   @Override
   public void onBindViewHolder(final FruitViewHolder holder, int position) {
       final FruitsData item = mFruitList.get(position);
       holder.mImage.setImageResource(item .getFruitImage());
       holder.mTitle.setText(item getFruitName());
       holder.setOnClickListener(new View.OnClickListener() {
           @Override public void onClick(View v) {
               listener.onItemClick(item);
           }
       });
   }