仅在CoordinatorLayout中滚动时显示工具栏阴影

Question

I would like to know how I can use a Toolbar / CollapsingToolbarLayout in a CoordinatorLayout to show a shadow only when content is scrolled under it and not otherwise (ie after the fragment is created it should not show a shadow until the user starts scrolling down a list). Preferably with just XML

(I don't think I need a AppBarLayout here, since the size of the toolbar is fixed and does not need the resizing or parallax effects etc..)

Any help with this is much appreciated

Answer 1

You can try setting elevation of the toolbar. 0 elevation means no shadow.

toolbar.setElevation(int)