Change TextColor
<com.google.android.material.bottomnavigation.BottomNavigationView
...
app:itemTextColor="#998971"
/>
Support TextColor and Selected TextColor
<com.google.android.material.bottomnavigation.BottomNavigationView
...
app:itemTextColor="@color/navigation_text_color"
/>
Create res/color/navigation_text_color
.
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_checked="true" android:color="#9A8971" />
<item android:state_checked="false" android:color="#AD9F88"/>
</selector>