JAVA SQL Connection - SQL2012

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Java

SQL

Mobile

Android

Hi,

I am impressed with this website so thought I may get some help from here

I am new to Android development try to do something on Android Studio

I need to connect SQL database 2012 from app
I have tried everything but nothing works.

Checks I have made
SQL Service and browser services are running
SQL config Manager - Protocol TCP/IP enabled, IPAll is set 1433
SQL Server allows remote connection
it has mix authentication (user + windows), I have tested
sqljdbc_auth and sqljdbc4 are in app folder and java folder.

Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver"); //(This Works)

String url = "jdbc:sqlserver://DBSPC\\SQL2012;databaseName=PFPRD;";
String url = "jdbc:sqlserver://localhost;databaseName=PFPRD;integratedSecurity=true";
String url = "jdbc:sqlserver://DBS-PC\\SQL2012;databaseName=PFPRD;user=android;password=jolly";

I have tried all different string as above

conn = DriverManager.getConnection(url);

it returns null

what could be the issue?, do I need to uninstall 2012 and get sql 2008
Please help