public class ConnectionClass {
    String ip = "127.0.0.1\\SQLEXPRESS:1433";
    String classs = "net.sourceforge.jtds.jdbc.Driver";
    String db = "db";
    String un = "sa";
    String password = "pasw";

    @SuppressLint("NewApi")
    public Connection CONN() {
        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
                .permitAll().build();
        StrictMode.setThreadPolicy(policy);
        Connection conn = null;
        
        try {

            Class.forName(classs);

          String  ConnURL = "jdbc:jtds:sqlserver://" + ip +";"
                     + "user=" + un + ";password="
                    + password + ";"+ "databaseName=" + db+";";
           conn = DriverManager.getConnection(ConnURL);


        } catch (SQLException se) {
            Log.e("ERRO", se.getMessage());
        } catch (ClassNotFoundException e) {
            Log.e("ERRO", e.getMessage());
        }
        catch (Exception e) {
            Log.e("ERRO", e.getMessage());
        }
        return conn;
    }

sqlservera management a bağlanırken 127.0.0.1\SQLEXPRESS şu şekilde bağlanıyor