在不使用库的情况下滑动（滑动以关闭）时在 recyclerview 项下创建按钮和按钮单击

Question

我正在使用 RecyclerView 来显示我的列表。我使用 ItemTouchHelper 实现 Swipe 以关闭 RecyclerView。底层布局是通过使用画布在 OnchildDraw 方法中实现的。现在我有一个问题：我想在我的图标上设置 onclick。通过点击图标，我想做一些功能。这是我的课：

public class ItemTouchHelperCallback : ItemTouchHelper.SimpleCallback
{
    private ContactSearchedResultAdapter _adapter;
    private RecyclerView _mRecyclerView;
    private int _swipeCount;
    private Android.Content.Res.Resources _resources;
    public ItemTouchHelperCallback(ContactSearchedResultAdapter adapter, RecyclerView mRecyclerView, Android.Content.Res.Resources resources)
        : base(0, ItemTouchHelper.Left | ItemTouchHelper.Right)
    {
        this._adapter = adapter;
        this._mRecyclerView = mRecyclerView;
        this._resources = resources;
    }
    public override bool OnMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target)
    {
        return false;
    }

    public override void OnSwiped(RecyclerView.ViewHolder viewHolder, int direction)
    {
        if (direction == ItemTouchHelper.Left)
        {
            _adapter.RemoveViewWithDialog(viewHolder.AdapterPosition, _mRecyclerView, _swipeCount);
            if (_swipeCount == 0)
                _swipeCount++;
        }
        else
        {
            _adapter.SaveContactToDataBase(viewHolder.AdapterPosition, _mRecyclerView);
        }
    }
    public override void OnChildDraw(Canvas cValue, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, bool isCurrentlyActive)
    {
        Paint paint = new Paint();
        View itemView = viewHolder.ItemView;
        float height = (float)itemView.Bottom - (float)itemView.Top;
        float width = height / 3;
        Bitmap icon;

        if (dX > 0)
        {
            paint.Color = Color.ParseColor("#388E3C");
            RectF background = new RectF((float)itemView.Left, (float)itemView.Top, dX, (float)itemView.Bottom);
            cValue.DrawRect(background, paint);
            icon = BitmapFactory.DecodeResource(_resources, Resource.Drawable.addoption);
            RectF icon_dest = new RectF((float)itemView.Left + width, (float)itemView.Top + width, (float)itemView.Left + 2 * width, (float)itemView.Bottom - width);
            cValue.DrawBitmap(icon, null, icon_dest, paint);
        }
        else
        {
            paint.Color = Color.ParseColor("#D32F2F");
            RectF background = new RectF((float)itemView.Right + dX, (float)itemView.Top, (float)itemView.Right, (float)itemView.Bottom);
            cValue.DrawRect(background, paint);
            icon = BitmapFactory.DecodeResource(_resources, Resource.Drawable.removeoption);
            RectF icon_dest = new RectF((float)itemView.Right - 2 * width, (float)itemView.Top + width, (float)itemView.Right - width, (float)itemView.Bottom - width);
            cValue.DrawBitmap(icon, null, icon_dest, paint);
        }

        float alpha = (float)1.0- Math.Abs(dX)/(float) itemView.Width;
        itemView.Alpha = alpha;
        itemView.TranslationX = dX;

        base.OnChildDraw(cValue, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
    }

}

如您所见，我正在 OnSwiped 方法中调用 ItemRemoving 或 ItemSaving。我现在想要做的是在点击图标时调用这些方法（在 OnchildDraw 中由画布绘制的图标）我搜索了很多关于这个主题的内容，但找不到任何不使用任何库就实现了这个功能的解决方案。我不想使用图书馆。

Answer 1

I had the same problem as yours. I coded half a day and finally find one way.

First of all, I think this is android ItemTouchHelper problem that there are no methods to solve that.

So it can't use ItemTouchHelper and other system methods.

What I do is this: 1. Set recylerView.setOnTouchListener to get (x,y) on screen.

2. When ItemTouchHelper onSwiped(), set it a state and find the clickable region.

3. 检查您的触摸点是否碰到图标区域。

4. 在 onTouch() 方法中被击中时做一些事情。

您可以在我的 Github 存储库中找到我的解决方案。 https://github.com/TindleWei/WindGod

这里有 3 种使用 ItemTouchHelper 的方法：

1. 像你这样的安卓正常方式

2. 前景和背景区域方式

3. 浏览器方式

在我的回购中，您可以查看第二种方式。