private static final String url = "jdbc:mysql://172.0.0.1:3306/intalum";
private static final String user = "pepe";
private static final String pass = "123456";
private Button buttonLoad;
private TextView firstName;


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

    firstName = (TextView) findViewById(R.id.firstName);
    buttonLoad = (Button) findViewById(R.id.buttonLoad);

    buttonLoad.setOnClickListener(new View.OnClickListener() {


        @Override
        public void onClick(View v) {
            new MyTask().execute();


        }


    });
}
    private class MyTask extends AsyncTask<Void, Void, Void> {
        private String fName = "";

        @Override
        protected Void doInBackground(Void... params) {
            try {
                Class.forName("com.mysql.jdbc.Driver");
                Connection con = DriverManager.getConnection(url, user, pass);
                Statement st = con.createStatement();
                String sql = "select * from cursos";
                final ResultSet rs = st.executeQuery(sql);


                rs.next();

                fName = rs.getString(2);

            } catch (Exception e) {
                e.printStackTrace();
            }

            return null;
        }

        @Override

        protected void onPostExecute(Void result) {

            firstName.setText(fName);
            super.onPostExecute(result);
        }
    }
}