购物车的删除逻辑有问题

Question

mTotalCount只是初始化了在后续的操作中没有赋值，当从前往后删除时实体的position与adapter中的位置并不一致

Answer 1

慕码人6229637 2017-09-29 20:00:43

@OnClick(R2.id.tv_top_shop_cart_del)
void onClickRemoveSelectedItem(){
    final List<MultipleItemEntity> data = mAdapter.getData();
    // 要删除的数据
    final List<MultipleItemEntity> deleteEntities = new ArrayList<>();
    int i = 0;
    for (MultipleItemEntity entity : data){
        final boolean isSelected = entity.getField(ShopCartMultipleFields.IS_SELECTED);
        entity.setField(ShopCartMultipleFields.POSITION, i);
        if (isSelected){
            deleteEntities.add(entity);
        }
        i++;
    }
    for (MultipleItemEntity entity : deleteEntities){
        final int removePosition = entity.getField(ShopCartMultipleFields.POSITION);
        if (removePosition <= mAdapter.getItemCount()) {
            mAdapter.remove(removePosition);
            //更新数据
            mAdapter.notifyItemRangeChanged(removePosition, mAdapter.getItemCount());
        }
    }
    checkItemCount();
}

可以这样写

• 提问者 Marsor #1

  非常感谢！挺不错的

• 找不到工作的苦比 #2

  @OnClick(R2.id.tv_top_shop_cart_remove_selected)
      void onClickRemoveSelectedItem() {
          final List<MultipleItemEntity> data = mAdapter.getData();
          //要删除的数据
          final List<MultipleItemEntity> deleteEntities = new ArrayList<>();
          int i = 0;
          for (MultipleItemEntity entity : data) {
              final boolean isSelected = entity.getField(ShopCartItemFields.IS_SELECTED);
              entity.setField(ShopCartItemFields.POSITION, i); //每次重新赋值位置
              if (isSelected) {
                  deleteEntities.add(entity);
              }
              i++;
          }
          //从List中最后一个开始删除，不影响整个下标
          for (int j = deleteEntities.size()-1; j >=0; j--) {
              int removePosition = deleteEntities.get(j).getField(ShopCartItemFields.POSITION);
              mAdapter.remove(removePosition); //remove方法内部调用notifyItemRangeChanged
          }
          //checkItemCount();
      }

Answer 2

zoro_ 2018-03-13 13:07:06

@说的就是你傻冒  点击全选，再删 有问题.