XamarinDevDays/Demos/TwitterSearch/TwitterSearch.Droid/Resources/values/styles.xml

<?xml version="1.0" encoding="UTF-8" ?>
<resources>
  <style name="MyTheme" parent="MyTheme.Base">
  </style>
  <!-- Base theme applied no matter what API -->
  <style name="MyTheme.Base" parent="Theme.AppCompat.Light.DarkActionBar">
    
    <!-- Set theme colors from http://www.google.com/design/spec/style/color.html#color-color-palette-->
    <!-- colorPrimary is used for the default action bar background -->
    <item name="colorPrimary">#0288D1</item>
    <!-- colorPrimaryDark is used for the status bar -->
    <item name="colorPrimaryDark">#03A9F4</item>
    <!-- colorAccent is used as the default value for colorControlActivated
         which is used to tint widgets -->
    <item name="colorAccent">#FFC107</item>
     <!-- You can also set colorControlNormal, colorControlActivated
         colorControlHighlight and colorSwitchThumbNormal. -->
  </style>

  <style name="MyTheme.ActionBar" parent="style/Widget.AppCompat.Light.ActionBar.Solid">
    <!-- remove shadow below action bar -->
    <!-- <item name="android:elevation">0dp</item> -->
    <!-- Support library compatibility -->
    <item name="elevation">0dp</item>
</style>
</resources>