android - 如何从主要活动中适配器设置的接口获取值

Question

如何从回收器视图适配器获取购物车项目数量到其父活动。

定义接口，在回收器视图适配器中设置项目计数并在主活动中实现接口

   interface OnItemClick {
           void onClick (String value);
   }


   private OnItemClick mCallback;
    public VegeHomeAdapter(Context ctx, ArrayList<ModelTopProd> mData, OnItemClick listener) {
           this.mData = mData;
           this.ctx = ctx;
           this.mCallback = listener;
       }
   int total_items = Integer.parseInt(preferenceHelper.getCARTNO());

                                   total_items+=1;
                                   preferenceHelper.putCARTNO(""+total_items);
                                   mCallback.onClick(""+preferenceHelper.getCARTNO());


        public class Home extends AppCompatActivity implements View.OnClickListener, OnItemClick {

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

   }

How to set values to text view TextView qtyTV; got from adapter

标签： androidandroid-recyclerviewinterfacesharedpreferencesadapter

Answer 1

适配器：

public VegeHomeAdapter(Context ctx, ArrayList<ModelTopProd> mData, OnItemClick listener) {
    this.mData = mData;
    this.ctx = ctx;
    this.mCallback = listener;

    interface OnItemClick {
       void onClick (String value);
       void getTotalItems(int totalItems);
   }
}
  int total_items = Integer.parseInt(preferenceHelper.getCARTNO());

  total_items+=1;
  preferenceHelper.putCARTNO(""+total_items);
  mCallback.onClick(""+preferenceHelper.getCARTNO());
}

家：

public class Home extends AppCompatActivity implements View.OnClickListener, OnItemClick {

  private int totalItems = 0

  @Override 
  public onClick(String itemName) { 
     //your implementation
  }

  @Override
  public void getTotalItems(int total)  {
      totalItems = total;
  }



}