how to get access to the field of already launched application

Question

inside controller there is a TextArea

the application to check if it is already running just exits without letting another instance start

    public class Main extends Application {

    private static Controller controller;

    @Override
    public void start(Stage primaryStage) throws Exception{

    FXMLLoader fxmlLoader = new FXMLLoader();
    AnchorPane anchorPane = fxmlLoader.load(getClass().getResource("sample.fxml"));
    primaryStage.setScene(new Scene(anchorPane));
    primaryStage.setTitle("Hello World");
    primaryStage.show();
}

public static void main(final String[] args) throws IOException {

    if (Application Launch)) {
       //how to access the open application


       FXMLLoader fxmlLoader  = new FXMLLoader(getClass().getResource("sample.fxml"));
       controller = fxmlLoader.getController();
       controller.doSomeThing("myText");

        System.exit(0);
    }else {
        launch(args);
    }

that is a controller

import javafx.fxml.FXML;
import javafx.scene.control.TextArea;

public class Controller {
@FXML
private TextArea textArea;

public void doSomeThing(String myText) {
    textArea.setText(myText);
}
}

So i have done an example just rename `MyController` to `Controller` — Raw, Jun 30 '19 at 19:32
Then declare `private static Controller` and then use it in the main — Raw, Jun 30 '19 at 19:44
Just show me your edit class where you done that what i have wrote in the answer — Raw, Jun 30 '19 at 20:24
You should just add this Line `controller = fxmlLoader.getController();` under `AnchorPane anchorPane = fxmlLoader.load..` and in the main methode only call `controller.doSomeThing("myText")` — Raw, Jun 30 '19 at 21:33
I think you need to reword your question. You are trying to determine if an instance of your **application** is already running before allowing another one to start? Because you seem to be asking at least two questions. You also seem to want one application to access the `TextField` of another? — Zephyr, Jun 30 '19 at 22:07
And instead of posting a very lengthy back-and-forth conversation, please [edit] your question to include a [mcve] (actually read that link, please). That is the best way for us to better understand what you're trying to accomplish. — Zephyr, Jun 30 '19 at 22:10
If it was clear, you'd have an answer and the question wouldn't be closed. Drop the attitude, read the rules and guidelines here, and try again. — Zephyr, Jun 30 '19 at 22:50
Believe what you want. You didn't get an answer, the question is closed, and I've explained why. Good luck getting help. — Zephyr, Jun 30 '19 at 22:57

score -1 · Accepted Answer · edited Jul 02 '19 at 06:27

-1

So a small example for you:

private static Controller controller;


FXMLLoader fxmlLoader  = new FXMLLoader(getClass().getResource("sample.fxml"));
Parent anchorPane = fxmlLoader.load();

controller = fxmlLoader.getController();
controller.doSomeThing("myText");
...

And in the Controller define a public function.

MyController :

public void doSomeThing(String myText) {
    myTextField.setText(myText);
}

edited Jul 02 '19 at 06:27

piet.t

11,718
21
43
52

answered Jun 30 '19 at 19:29

Raw

461
7
15

He has since edited the original post and removed this question. I think this answer could now be deleted. – Zephyr Jul 01 '19 at 00:00
@Zephyr don't think for others be so kind – Armen Jul 02 '19 at 23:19

how to get access to the field of already launched application

1 Answers1