android - 使用Item Touch Helper android拖动阴影

Question

android 中的ItemTouchhelper 类仅有助于在recyclerview 周围移动整个 View 。是否可以使用 Item touchHelper 类制作要拖动的 View 的阴影(将原始 View 固定在其位置)？

Answer 1

我覆盖了 onChildDraw 并制作了自己的阴影

public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
        super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);

        if (isCurrentlyActive) {
            if (actionState == ItemTouchHelper.ACTION_STATE_DRAG) {
                // make shadown
                isRotated = true;
            }
        } else {
            // view is going back to orig
            if (isRotated) {
                // undo shadow
            }
        }
    }