How to change system navigation bar color

Question

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

H

Answer 1

 getWindow().setNavigationBarColor(ContextCompat.getColor(MainActivity.this,R.color.colorPrimary)); //setting bar color   
 getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR); //additional setting items to be black if using white ui