Remove android.widget.Toolbar shadow

Question

Using API21+ Toolbar:

// Toolbar
Toolbar toolbar = new Toolbar(this);
toolbar.showOverflowMenu();

Would like to remove its shadow

Answer 1

set "#00000000" to the backgroundColor of toolbar , remember that: if you use CoordinatorLayout and AppBarLayout ,you should remove the app:layout_behavior="@string/appbar_scrolling_view_behavior" of your contentView , I have made this elementary mistake.