MyApplication.java

// Reading Text From server ( SpanLabel )
// /src/com/mycompany/myapp/MyApplication.java
//https://imgur.com/a/vANWoDj

package com.mycompany.myapp;

import com.codename1.components.SpanLabel;
import com.codename1.io.ConnectionRequest;
import static com.codename1.ui.CN.*;
import com.codename1.ui.Display;
import com.codename1.ui.Form;
import com.codename1.ui.Dialog;
import com.codename1.ui.Label;
import com.codename1.ui.plaf.UIManager;
import com.codename1.ui.util.Resources;
import com.codename1.io.Log;
import com.codename1.ui.Toolbar;
import java.io.IOException;
import com.codename1.ui.layouts.BoxLayout;
import com.codename1.io.NetworkEvent;
import com.codename1.io.NetworkManager;

/**
 * This file was generated by <a href="https://www.codenameone.com/">Codename One</a> for the purpose
 * of building native mobile applications using Java.
 */
public class MyApplication {

    private Form current;
    private Resources theme;

    public void init(Object context) {
        // use two network threads instead of one
        updateNetworkThreadCount(2);

        theme = UIManager.initFirstTheme("/theme");

        Toolbar.setGlobalToolbar(true);

        addNetworkErrorListener(err -> {
            // prevent the event from propagating
            err.consume();
            if(err.getError() != null) {
                Log.e(err.getError());
            }
            Log.sendLogAsync();
            Dialog.show("Connection Error", "There was a networking error in the connection to " + err.getConnectionRequest().getUrl(), "OK", null);
        });
    }

    public void start() {
        if(current != null){
            current.show();
            return;
        }
         Form TextForm = new Form("Hi World", BoxLayout.y());
         TextForm.add(new Label("Hi World"));

        String url="http://localhost/codenameoneRessource/text.txt";
        ConnectionRequest con=new ConnectionRequest();
        con.setUrl(url);
        con.addResponseListener((e)->{
        String response= new String(con.getResponseData());
        System.out.println(response); //print response in commandLine
        // using span label to auto return to Line / if text is short print "response" directly
        SpanLabel spanlb = new SpanLabel(); spanlb.setText(response);
        TextForm.add(spanlb);

        });
        NetworkManager.getInstance().addToQueueAndWait(con);


        TextForm.show();
    }

    public void stop() {
        current = getCurrentForm();
        if(current instanceof Dialog) {
            ((Dialog)current).dispose();
            current = getCurrentForm();
        }
    }

    public void destroy() {
    }

}