Changing the color of the BottomNavigationView when switching

This can be achieved by creating a bottom_navigation_color.xml file under the res/color directory and writing the colors for each state in it.

alt

	<?xml version="1.0" encoding="utf-8"?>
	<android.support.constraint.ConstraintLayout
	xmlns:android="http://schemas.android.com/apk/res/android"
	xmlns:tools="http://schemas.android.com/tools"
	xmlns:app="http://schemas.android.com/apk/res-auto"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	tools:context=".MainActivity">

	<FrameLayout
	android:id="@+id/fragment_container"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:layout_marginBottom="56dp"
	android:text="@string/title_home"
	app:layout_constraintLeft_toLeftOf="parent"
	app:layout_constraintTop_toTopOf="parent" />

	<android.support.design.widget.BottomNavigationView
	android:id="@+id/navigation"
	android:layout_width="0dp"
	android:layout_height="wrap_content"
	android:background="@color/colorBottomNavigation"
	app:itemIconTint="@color/bottom_navigation_color"
	app:itemTextColor="@color/bottom_navigation_color"
	app:layout_constraintBottom_toBottomOf="parent"
	app:layout_constraintLeft_toLeftOf="parent"
	app:layout_constraintRight_toRightOf="parent"
	app:menu="@menu/navigation" />

	</android.support.constraint.ConstraintLayout>

view raw activity_main.xml hosted with ❤ by GitHub

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