What are the sizes of the icons in Android notifications action-buttons?

Question

In expandable Notifications: what dimensions (in dp) should the icons have? Like the Icons for Snooze and Email here:

Answer 1

Preferred Notification Icon Size 24x24dp

mdpi @ 24.00dp = 24.00px
hdpi @ 24.00dp = 36.00px
xhdpi @ 24.00dp = 48.00px