Using API21+ Toolbar:
// Toolbar
Toolbar toolbar = new Toolbar(this);
toolbar.showOverflowMenu();
Would like to remove its shadow
Use attribute app:elevation="0dp" to your Toolbar or AppBarLayout to remove the shadow.
#. If you are using Toolbar only, then add attribute app:elevation="0dp" to Toolbar.
#. If you are using AppBarLayout as a container of Toolbar, then add attribute app:elevation="0dp" to AppBarLayout.
OUTPUT:
UPDATE:
If you want to remove it programmatically then you can use below code:
getSupportActionBar().setElevation(0);
Hope this will help~