Source code
<?xml version="1.0" encoding="utf-8"?>
<inset xmlns:android="http://schemas.android.com/apk/res/android" android:insetLeft="@dimen/abc_control_inset_material" android:insetRight="@dimen/abc_control_inset_material" android:insetTop="@dimen/abc_control_inset_material" android:insetBottom="@dimen/abc_control_inset_material">
<selector>
<item android:state_checked="false" android:state_pressed="false">
<layer-list>
<item android:drawable="@drawable/abc_textfield_default_mtrl_alpha" />
<item android:drawable="@drawable/abc_spinner_mtrl_am_alpha" />
</layer-list> />
<item>
<layer-list>
<item android:drawable="@drawable/abc_textfield_activated_mtrl_alpha" />
<item android:drawable="@drawable/abc_spinner_mtrl_am_alpha" />
</layer-list> />
</selector>
</inset>