Androidx在回收器视图中滑动以显示删除图标，并进一步滑动以删除

Question

我在回收器视图中实现了向左滑动以删除操作，如下所示：

public class SwipeToDelete extends ItemTouchHelper.SimpleCallback {

    //my custom adapter
    private MyAdapter slAdapter;

    public SwipeToDelete(MyAdapter adapter){
       // TO only swipe to the left
        super(0, ItemTouchHelper.LEFT);
        slAdapter = adapter;
    }

    @Override
    public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {
        int position = viewHolder.getAdapterPosition();
        slAdapter.deleteItem(position);
    }
}

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MYViewHolder> {

   //... onCreateViewHolder .. etc

   //creating a list of my custom layout view
   private List<MyCustomCardView> cards;

   public void deleteItem(int position){
        cards.remove(position);
        notifyItemRemoved(position);
    }
}

只需这么做，我就可以在我的RecycerView中滑动和删除视图。

Answer 1

您可以在模型中使用额外的布尔字段（例如：isShowRemoveButton）并将其设置为true（例如：cards.get（position）.SetShowRemoveButton（true））而不是“cards.remove（position）”，并在onBindViewHolder中处理该字段以在条目布局上显示删除按钮

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MYViewHolder> {

       //... onCreateViewHolder .. etc

    private List<MyCustomCardData> cards;//CardData instead of CardView

    public void deleteItem(int position){
            cards.get(position).setShowRemoveButton(true) ;
            notifyItemRemoved(position);
        }

    public void onBindViewHolder(myViewHolder holder, int position) {

            MyCustomCardData currentdata = cards.get(position);
            holder.removeButton.setVisibility(currentdata.isShowRemoveButton? VISIBLE : GONE);
    }
}