PostgreSQL Database not connecting to Android app

My database is running fine because I tested it using Eclipse with simple Java code that just connects and reports back success or fail. I connect fine.I can even read and write to it there. Now, when I try to do the same thing in Android Studio,the connection fails. I created a lib folder for the app and put all the extra .jar files there including the JDBC connector for Postgresql that I used in Eclipse.

public class MainActivity extends AppCompatActivity {
private TextView f;
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    f = (TextView) findViewById(R.id.textViewa);
    java.sql.Connection conn = null;
    try {
        final String mysqlConnUrl = "jdbc:postgresql://suleiman.db.elephantsql.com:5432/rwvwaocz";
        try {
            Class.forName("org.postgresql.Driver");
            Properties props = new Properties();
            props.setProperty("user", "postgres");
            props.setProperty("password", "mitko9670");
            conn = DriverManager.getConnection(mysqlConnUrl, "postgres","mitko9670");
            f.setText("SUCCESS");
        } catch (NoClassDefFoundError i) {
            i.printStackTrace();
        }
        conn.close();
    } catch (Exception ex) {
        f.setText("No");
        ex.printStackTrace();
    }
}

}

I tried with but none work. Can you give me an example of connecting to the database. Apart from the jar for Postgresql, is there anything else to put