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

In Pixels:

22 × 22 area in 24 × 24 (mdpi)

33 × 33 area in 36 × 36 (hdpi)

44 × 44 area in 48 × 48 (xhdpi)

66 × 66 area in 72 × 72 (xxhdpi)

88 × 88 area in 96 × 96 (xxxhdpi)

as seen on http://iconhandbook.co.uk/reference/chart/android/