/** Called when the activity is first created. */
String str="new";
static ResultSet rs;
static PreparedStatement st;
static Connection con;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

            final   TextView tv=(TextView)findViewById(R.id.user);

            try
            {
                Class.forName("com.mysql.jdbc.Driver");
                con= (Connection) DriverManager.getConnection("jdbc:mysql://88.88.88.88:3306/BaseDatos","Usuario","Contraseña");

                st=con.prepareStatement("select Salario from ofertas where Id=4");
                rs=st.executeQuery();
                while(rs.next())
                {
                    str=rs.getString(2);
                }
                tv.setText(str);
                setContentView(tv);
            }
            catch(Exception e)
            {
                tv.setText("Error");
            }
        }
    }