android - 加速回收器查看 "swipe"动画？

Question

我将自定义 ItemTouchHelper.SimpleCallback 类添加到我的 RecyclerView 以添加“滑动时关闭”功能，用户可以向左滑动项目并获取项目从列表中删除。

我通过将 dX(来自 onChildDraw())除以 10，将 View 可以向左“滑动”的数量限制为 View 长度的 10%。但是，用户必须滑动的长度是 100%项目滑动屏幕的 10%。我想限制滑动(增加项目滑动速度？)以便用户只需滑动屏幕的 10% 即可让项目滑动 10%。见下图:

紫色圆圈是用户触摸。当用户滑动整个屏幕宽度时，项目滑动 10%(红色是滑动时显示项目“后面”的布局)。

如何提高滑动速度以滑动 10% 的屏幕宽度就足够了，而不是滑动整个屏幕宽度？

这是我的 ItemTouchHelper.SimpleCallback 类的代码:

public class SwipeDeleteHelper extends ItemTouchHelper.SimpleCallback {

    private GameAdapter adapter;
    private Drawable icon;
    private final ColorDrawable background;
    private static final int LIMIT_SWIPE_LENGTH = 10;


    public SwipeDeleteHelper(GameAdapter adapter, Context context) {
        super(0, ItemTouchHelper.LEFT);
        this.adapter = adapter;
        icon = ContextCompat.getDrawable(adapter.getContext(),
                R.drawable.delete);
        background = new ColorDrawable(context.getColor(R.color.colorAccent));
    }

    @Override
    public boolean onMove(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, @NonNull RecyclerView.ViewHolder target) {
        return false;
    }

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

    @Override
    public void onChildDraw(@NotNull Canvas c, @NotNull RecyclerView recyclerView, @NotNull RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
        dX = dX/LIMIT_SWIPE_LENGTH;

        super.onChildDraw(c, recyclerView, viewHolder, dX,
                dY, actionState, isCurrentlyActive);

        View itemView = viewHolder.itemView;
        int backgroundCornerOffset = 20;

        int iconMargin = (itemView.getHeight() - icon.getIntrinsicHeight()) / 2;
        int iconTop = itemView.getTop() + (itemView.getHeight() - icon.getIntrinsicHeight()) / 2;
        int iconBottom = iconTop + icon.getIntrinsicHeight();

        if(dX < 0) { //left swipe
            int iconLeft = itemView.getRight() - iconMargin - icon.getIntrinsicWidth();
            int iconRight = itemView.getRight() - iconMargin;
            icon.setBounds(iconLeft, iconTop, iconRight, iconBottom);

            background.setBounds(itemView.getRight() + ((int) dX) - backgroundCornerOffset,
                    itemView.getTop(), itemView.getRight(), itemView.getBottom());
        } else { //unswiped
            background.setBounds(0, 0, 0, 0);
        }
        background.draw(c);
        icon.draw(c);
    }

}

Answer 1

覆盖 getSwipeThreshold 以返回 0.1f:

@Override
    public float getSwipeThreshold(@NonNull RecyclerView.ViewHolder viewHolder) {
        return 0.1f;
    }