Hi! I think your best bet would be the developer.android.com documentation. Although there are code references, most of them explain the concepts in the beginn

Hi! I think your best bet would be the developer.android.com documentation. Although there are code references, most of them explain the concepts in the beginning or inbetween. Just ignore the code parts. Here is an example for the notifications you mentioned: https://developer.android.com/develop/ui/views/notifications https://developer.android.com/develop/ui/views/notifications But you can find info on the other topics in here as well.