// selector

<?xml version="1.0" encoding="utf-8"?>

<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@drawable/child" android:state_checked="false"/>

    <item android:drawable="@drawable/child_fill" android:state_checked="true"/>

</selector>

​

// disable defualt tint color

bottomNavigationView.setItemIconTintList(null);