How do I apply a style to all buttons of an Android application

I have a style applied to my whole application:

AndroidManifest.xml:

<application android:theme="@style/ApplicationStyle" android:icon="@drawable/icon" android:label="@string/app_name">

And in my styles.xml:

 <style name="ApplicationStyle" parent="android:Theme">
  <item name="android:button">@style/CKButton</item>
 </style>
 <style name="CKButton" parent="android:style/Widget.Button">
  <item name="android:textSize">19sp</item>
  <item name="android:layout_margin">0dip</item>
  <item name="android:background">#ff0000</item>
 </style>

But the style doesn't get applied.

I'm sorry if I just used the false name in the ApplicationStyle - Item, but I have no clue where to look for the object names and simply assumed, that android:button applies to all buttons.

For Android styles, you reference the preset attributes that Android has laid out in R.attr. In this case, it looks like you want to to reference android:buttonStyle. I think this would work:

<style name="ApplicationStyle" parent="android:Theme">
  <item name="android:buttonStyle">@style/CKButton</item>
</style>

For Material components theme it would be like this:

<style name="AppTheme" parent="Theme.MaterialComponents.Light.NoActionBar">
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>

    <item name="materialButtonStyle">@style/AppTheme.Button</item>
</style>