setting a common button style for older OS versions

Question

I am setting a common button style for older android versions but this code is not working on Kitkat, apart from making another layout resource file is there a way i can give some particular style and fix this issue ?

       <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
        <item name="android:buttonStyle">@style/RobotoButtonStyle</item>
       </style>

        // here is my custom button style

      <style name="RobotoButtonStyle" parent="Base.TextAppearance.AppCompat.Button">
            <item name="android:fontFamily">@font/roboto_regular</item>
            <item name="android:textAlignment">center</item>
            <item name="fontFamily">@font/roboto_regular</item>
            <item name="android:textColor">@color/colorWhite</item>
            <item name="android:background">@drawable/button_curved</item>
            <item name="android:textAllCaps">false</item>
        </style>

Answer 1

These were used for older versions of Android

<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
   <item name="buttonStyle">@style/RobotoButtonStyle</item>
</style>

<style name="RobotoButtonStyle" parent="Base.TextAppearance.AppCompat.Button">
      <item name="android:fontFamily">@font/roboto_regular</item>
      <item name="android:textAlignment">center</item>
      <item name="fontFamily">@font/roboto_regular</item>
      <item name="android:textColor">@color/colorWhite</item>
      <item name="android:windowBackground">@drawable/button_curved</item>
      <item name="android:textAllCaps">false</item>
</style>