BottomNavigationBarDemo

This is the demo of how you can implement new Bottom Navigation Bar with Elevation and Ripple effect

First of all use compile 'com.android.support:design:25.0.1' and then you can add BottomNavigationView in your layout.

<android.support.design.widget.BottomNavigationView
    android:id="@+id/bottom_navigation"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:background="@android:color/white"
    app:elevation="16dp"
    app:itemIconTint="@drawable/nav_item_color_state"
    app:itemTextColor="@drawable/nav_item_color_state"
    app:menu="@menu/bottom_navigation_main" />

It only works if you set white color for background android:background="@android:color/white"

Note that ripple effect will disappear if you use app:itemBackground property.

Handling enabled/disabled state:

You need to create selector file:

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

If you want change standard grey ripple effect, change colorControlHighlight property in AppTheme so it looks like following:

<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
    <!-- Customize your theme here. -->
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
    <item name="colorControlHighlight">@color/colorPrimaryRipple</item>
</style>

Use 26% alpha for colored ripples.

<color name="colorPrimary">#3F51B5</color>
<color name="colorPrimaryRipple">#423F51B5</color>