I don’t think you should access the DB server right away from Android App. You need to have a web service implemented to talk with your db server. Web Service can function as the layer between your DB and Android App.
If you use the web service deployed in the same local area network which is connected via Wifi, then you can use the IP of the machine which has hosted the Web Service to access the web service from your Android App.
Else just deploy your service to a web host and directly call the service from your mobile app.
solved Make Android connect to local database server [closed]