Selected tab’s color in Bottom Navigation View

While making a selector, always keep the default state at the end, otherwise only default state would be used. You need to reorder the items in your selector as:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_checked="true" android:color="@android:color/holo_blue_dark" />
    <item android:color="@android:color/darker_gray"  />
</selector>

And the state to be used with BottomNavigationBar is state_checked not state_selected.

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