styles.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

  <!-- Base application theme. -->
  <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>
  </style>

  <style name="AppTheme.NoActionBar" parent="Theme.AppCompat.DayNight.NoActionBar">
    <item name="windowActionBar">false</item>
    <item name="windowNoTitle">true</item>
    <item name="android:background">@null</item>
  </style>


  <style name="AppTheme.NoActionBarLaunch" parent="Theme.SplashScreen">
    <item name="android:background">@drawable/splash</item>
  </style>

  <style name="MyCustomDatePicker" parent="android:Theme.Material.Dialog.Alert">
    <item name="android:colorAccent">@color/colorPrimary</item>
  </style>

  <style name="MyCustomLightDatePicker" parent="android:Theme.Material.Light.Dialog.Alert">
    <item name="android:colorAccent">@color/colorPrimary</item>
  </style>
</resources>