Hi, you can still use the framework, though it was last committed 3 years ago. It can also support v12. The issues opened are quite new, so you can say there are people who are using it until now. 

Hi,

Am not sure what happens with the above GitHub repository, if you are looking to create mobile application for odoo, you can do it by creating necessary controllers in odoo or you can the Odoo XMLRPC, using odoo xmlrpc, the Android developer can communicate with odoo using the Java, See this Odoo Documentation: External API

Other than this you can create custom controllers of json type in Odoo and using this controllers you can communicate with odoo for reading and writing the data, you can see such an example here: Odoo Mobile App Development - Authentication, Fetching Data & Creating Records Using Controller

Thanks