It is extremely not recommended to use "connectors" of banks in android to external databases, because you would expose the data of your server in the android application(.apk), can be decompiled and the data be accessed.
I recommend you do as @Piovezan commented, use Webservices!
I will list some perks:
1 - More security guard and stability.(Server security data will not be exposed in the code)
2 - Abstraction of server security logic (You will make a request and the server will handle).
3 - The Logic of the webservice may be shared with other services that need these of your database data(Any application may contact the service and have access to your data)
Some tutorials that can help you:
http://www.androidhive.info/2014/01/how-to-create-rest-api-for-android-app-using-php-slim-and-mysql-day-12-2/
http://www.androidhive.info/2012/05/how-to-connect-android-with-php-mysql/
http://www.restapitutorial.com/
Good luck!
Thank you ! I will follow your tips!
– saidmrn