How to change system navigation bar color

In guidelines of Android 5.0, the navigation bar seems customizable: http://www.google.com/design/spec/layout/structure.html#structure-system-bars

How can I change the navigation bar color? I would like to use a white style.

Screenshots:

Edit: In my resources, I tested the style:

<item name="android:navigationBarColor" tools:targetApi="21">@android:color/white</item>

But the buttons are white. I would like the same renderer as the second image.

Starting from API 27, it is now possible to use the light style of the navigation bar:

<item name="android:navigationBarColor">@android:color/white</item>
<item name="android:windowLightNavigationBar">true</item>

From the documentation:

windowLightNavigationBar

If set, the navigation bar will be drawn such that it is compatible with a light navigation bar background.

For this to take effect, the window must be drawing the system bar backgrounds with windowDrawsSystemBarBackgrounds and the navigation bar must not have been requested to be translucent with windowTranslucentNavigation. Corresponds to setting SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR on the decor view.

Use this in your Activity.

 if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        getWindow().setNavigationBarColor(getResources().getColor(R.color.green));
    }

add this line in your v-21/style

<style name="AppTheme.NoActionBar">
    <item name="windowActionBar">false</item>
    <item name="windowNoTitle">true</item>
    <item name="android:windowDrawsSystemBarBackgrounds">true</item>
    <item name="android:statusBarColor">@android:color/transparent</item>
    <item name="android:navigationBarColor">@android:color/black</item>
</style>

This code changes the navigation bar color according to your screen background color:

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            getWindow().setNavigationBarColor(ContextCompat.getColor(this, R.color.any_color));
        }

You can also use the light style for the navigation bar:

<item name="android:navigationBarColor">@android:color/white</item>

the navigation bar is not supposed to be colored

When you customize the navigation and status bars, either make them both transparent or modify only the status bar. The navigation bar should remain black in all other cases.

(source https://developer.android.com/training/material/theme.html )

BUT, you can use this library to achieve what you want :) https://github.com/jgilfelt/SystemBarTint