I'm not sure if it's already possible to add a library project via the IDE (-> without any problems). I do this by configuring the gradle files of my project like this:
- create a folder in your root project directory named
libs
- copy the folder
datetimepicker-library
tolibs
add this library in your
settings.gradle
with the following command:include ':libs:datetimepicker-library'
go to your
build.gradle
file of yourAppProject
and add the following line to yourdependencies
:implementation project(':libs:datetimepicker-library')
at least you have to sync your gradle files: Tools -> Android -> Sync Project with Gradle Files
Please try this. If you get errors please post the log file.