Android App -> MYSQL databas

package com.example.dbtestar;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.NavUtils;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class MainActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        Connection connection = null;
        try {
            // Load the JDBC driver
            String driverName = "org.gjt.mm.mysql.Driver"; // MySQL MM JDBC driver
            Class.forName(driverName);

            // Create a connection to the database
            String serverName = "192.168.0.1";
            String mydatabase = "tutorial";
            String url = "jdbc:mysql://" + serverName +  "/" + mydatabase; // a JDBC url
            String username = "root";
            String password = "test";
            connection = DriverManager.getConnection(url, username, password);
            
            Statement stmt = connection.createStatement();
            ResultSet rs = stmt.executeQuery("SELECT * FROM users");
            TextView txt = (TextView) findViewById(R.id.test);
            txt.setText(rs.toString());
        } catch (ClassNotFoundException e) {
            // Could not find the database driver
        } catch (SQLException e) {
            // Could not connect to the database
        }
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

    
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                NavUtils.navigateUpFromSameTask(this);
                return true;
        }
        return super.onOptionsItemSelected(item);
    }

}