Gitesh Magdy

Enable USB debugging in the device system settings under Developer options. You can find this option in one of the following locations, depending on your Android version: Android 9 (API level 28) and higher: Settings > System > Advanced > Developer Options > USB debugging.

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Composition is the term used to describe the arrangement of the visual elements in a painting or other artwork It is how the elements of

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In my case, I'll use my favorite IDE to create a new JavaFX project. The concepts that we will see can be applied in any way.

The default code will look like this regardless of which archetype you choose.

contents may vary depending on the chosen one

If you want, you can remove any controller classes or files that were created at the beginning of the project. After you have done that, make a repository for your project.

Let's think about the cases in which we might need to share information before we begin with the explanation.

Imagine if you had to build an application that asked a user for certain information, the basics, and then create a class that encapsulated it.

For this example, we are going to keep it simple, even though you can create forms with fancy designs.

If you want to create a HomeController.java class, you need to create a new Home.fxml file and save it in the resources/fxml folder. The code is in the FXML file.

In your MainApp.java file, replace the code you have there with the following.

If you run your application now, you should see the following window.

Excellent.

We are going to create a scene in which we will show the information that we send from the main window, and it will be simple. Similar to what we did, create a new Destino.fxml file with the associated DestinoController.java controller. The code is in the FXML file.

A button that will come in handy later will be one of the simple labels that will be rendered a window with.

You will have noticed that the fields in the main window came with a fixed id, this in order to collect the data and save it in an instance of the User class, for this create a new function in the HomeController.java class called sendData(Event) where you save the form information, like this:

We now have everything we need to start exploring the different ways we can send information to our target window. Save all the changes you've made to your repository, as this will be the starting point for each of the three ways.

In JavaFX, all the classes that inherit from the Node class have the setUserData(Object) and getUserData() methods that, in the words of the official documentation, allow you to save any object, effectively anchoring it to the node, in order to retrieve it at a later time.

This method will be used to save the instance of the user class. The stage is the same for both windows, so it's an excellent place to store information.

The following command is needed to create a new branch in our project repository.

Next, reference the elements of your view in your DestinoController.java file and create a function called retrieveData that is anchored to the button we designed earlier, there as you can guess, we are going to retrieve the instance of the User class from the root node, For that follow these steps:

The class should look like this.

Add the following code to the HomeController.java class.

The user is being passed to the stage instance by line number 6.

If you run your application with test data, you will see that you can retrieve it in the target window.

The setUserData method is useful when we want to pass a single instance of the class, but it is not recommended if we want to pass a larger amount of data.

Go back to the master branch and use the command.

The command will allow you to create a new branch.

In the DestinoController.java class, create a private attribute of type User with its respective setter method, then, similar to what was done before, create a function retrieveData that is anchored to the button we designed, the logic is the same as in the method above, with the difference that we will fill the labels directly with this instance, like this:

We must manually create the controller and pass the user instance to it at the time we create the view to work, otherwise we will not be able to use this method. To do this, you need to edit your destination.fxml file and remove the following property.

Next, in the HomeController.java class, use the send data method.

The logic is the same as before. The complete code is what the function is called.

If you run your app one more time, you'll see that the data is in the other view, as you'd expect.