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.

1. Inside res create folder with name color (like drawable)

2. Right click on color folder. Select new-> color resource file-> create color.xml file (bnv_tab_item_foreground) (Figure 1: File Structure)

3. Copy and paste bnv_tab_item_foreground

<android.support.design.widget.BottomNavigationView            android:id="@+id/navigation"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_marginEnd="0dp"            android:layout_marginStart="0dp"            app:itemBackground="@color/appcolor"//diffrent color            app:itemIconTint="@color/bnv_tab_item_foreground" //inside folder 2 diff colors            app:itemTextColor="@color/bnv_tab_item_foreground"            app:layout_constraintBottom_toBottomOf="parent"            app:layout_constraintLeft_toLeftOf="parent"            app:layout_constraintRight_toRightOf="parent"            app:menu="@menu/navigation" />

bnv_tab_item_foreground:

 <?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/white" />        <item android:color="@android:color/darker_gray"  />    </selector>

Figure 1: File Structure:

BottomNavigationView uses colorPrimary from the theme applied for the selected tab and it uses android:textColorSecondary for the inactive tab icon tint.

So you can create a style with the prefered primary color and set it as a theme to your BottomNavigationView in an xml layout file.

styles.xml:

 <style name="BottomNavigationTheme" parent="Theme.AppCompat.Light">        <item name="colorPrimary">@color/active_tab_color</item>        <item name="android:textColorSecondary">@color/inactive_tab_color</item> </style>

your_layout.xml:

<android.support.design.widget.BottomNavigationView            android:id="@+id/navigation"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:background="?android:attr/windowBackground"            android:theme="@style/BottomNavigationTheme"            app:menu="@menu/navigation" />