maven - How to import / reference a gradle application in android application using command line (ant) -

i using android command line tool (ant , adb) manage application.

as project has no "gradle" specifications, wondering how import following gradle library (android google datepicker).

https://github.com/flavienlaurent/datetimepicker 

the files found @ root of application are

$ ls androidmanifest.xml  build.xml  local.properties      res ant.properties       gen        proguard-project.txt  src bin                  libs       project.properties 

i use following commands build , install application

$ ant debug $ adb install -r <path apk>