Android Question FCM Notification - wich graphic format/resolution for small icon on top left position?

[dd1]

I try to follow the Push Notification tutorial/example Push Notification
On B4a ide, when you choose Project / Select Icon you can modify the default B4x icon viewable on top left corner of app form
But for notification message, there is also a very small icon that appear on top side of Android system to indicate a notification is received
This icon is selectable with

....
n.icon = "Very_Small_Icon"
n.SetInfo(Message.GetData.Get("title"), Message.GetData.Get("body"), Main)
n.Notify(1)
....

Wich graphic format/size/resolution must have?
There are web site to obtain this little icon from main app icon?

 

[DonManfred]

Notification icon size in Android

I am trying to get information about the notification icon sizes to create them for my app but I am a little bit lost. I have read a few posts that basically says this: For MDPI 24 px For HDPI 36 ...

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