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// 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);