registerPush.java

String token = com.google.firebase.iid.FirebaseInstanceId.getInstance().getToken();
        if (token != null) {
            com.codename1.io.Preferences.set("pushKey", token);
           
your.app.namespace.SomeClass.SomeStaticMethod(token);        }       
        //check token is the same after 5 seconds
        //cn1's gcm service sometimes gets the wrong token and this is then useful to overwrite it
        java.util.Timer timer = new java.util.Timer();
        timer.schedule(new java.util.TimerTask() {
            public void run() {
                Display.getInstance().callSerially(new Runnable() {
                    public void run() {
                        String token = com.google.firebase.iid.FirebaseInstanceId.getInstance().getToken();
                        if (token != null && !(token).equals(com.codename1.io.Preferences.get("pushKey", ""))) {
                            com.codename1.io.Preferences.set("pushKey",token);
                           
your.app.namespace.SomeClass.SomeStaticMethod(token);
                         }
                    }
                });
            }
        }, 5000);