JavaFX TreeView 🌳

javafx treeview treeitem tutorial example explained
#javafx #treeview #treeitem

[@BroCodez]

package application;
import java.net.URL;
import java.util.ResourceBundle;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeView;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.input.MouseEvent;
public class Controller implements Initializable{

@FXML
private TreeView treeView;

@Override
public void initialize(URL arg0, ResourceBundle arg1) {

TreeItem rootItem = new TreeItem("Files");
//TreeItem rootItem = new TreeItem("Files", new ImageView(new Image("Folder_Icon.png")));

TreeItem branchItem1 = new TreeItem("Pictures");
TreeItem branchItem2 = new TreeItem("Videos");
TreeItem branchItem3 = new TreeItem("Music");

TreeItem leafItem1 = new TreeItem("picture1");
TreeItem leafItem2 = new TreeItem("picture2");
TreeItem leafItem3 = new TreeItem("video1");
TreeItem leafItem4 = new TreeItem("video2");
TreeItem leafItem5 = new TreeItem("music1");
TreeItem leafItem6 = new TreeItem("music2");

branchItem1.getChildren().addAll(leafItem1, leafItem2);
branchItem2.getChildren().addAll(leafItem3, leafItem4);
branchItem3.getChildren().addAll(leafItem5, leafItem6);

rootItem.getChildren().addAll(branchItem1, branchItem2, branchItem3);

//treeView.setShowRoot(false);
treeView.setRoot(rootItem);
}

public void selectItem() {

TreeItem item = treeView.getSelectionModel().getSelectedItem();

if(item != null) {
System.out.println(item.getValue());
}
}
}

[@ЙирюВонаирда]

Hello, Bro.
Wanna ask you about this FX stuff and all. Currently is there any sense in using swing? Or FX is the better and bestiest and all?
Didnt find a video about trees in swing-playlist and so want to ask this.

[@rapbimsfrienda22]

Thanks for your great Explanation ☺️

[@mcebabds]

I continuously ran in to problems, when enter the last line of code --> adding image to the rootItem,
In the end I could only resolve it by adding a few lines.
@Override
public void initialize(URL arg0, ResourceBundle arg1) {
//, new ImageView(new Image("Folder_Icon.png")) Import as it gave an error in the import method

Image folderIcon = new Image(getClass().getResourceAsStream("Folder_Icon.png"));
// Resize the image to fit within reasonable dimensions --> image was way to big)
ImageView iconView = new ImageView(folderIcon);
iconView.setFitWidth(16); // Set the desired width
iconView.setFitHeight(16); // Set the desired height

TreeItem rootItem = new TreeItem("Files", iconView);

[@RipperRoo92]

I'm lucky that I have found this channel.
It's like finding a golden egg in a easter egg hunt.

[@techwithgantavya6381]

Yo Bro Thanks A Lot I learnt Java Just Because Of You

[@sethg7336]

Thank you bro you are the best

[@medinyonlineschool4493]

Thanks to share

[@erikalcalasalero3810]

Amazing video ! is there a chance you can explain how to drag and drop treeview items wthin the treeview ? All the best !

[@ЙирюВонаирда]

Hello, Bro.
Wanna ask you about this FX stuff and all. Currently is there any sense in using swing? Or FX is the better and bestiest and all?
Didnt find a video about trees in swing-playlist and so want to ask this.

[@ЙирюВонаирда]

*for the desktop applications
I still want to work as software dev. Dont like web development. With that said I still like html and css. Web-field just feels kinda awkward. oO

[@DonWojtasI]

I had a problem with an exception that occured when clicking on an empty space within the Treeview.
After some googling changing selectItem() to selectItem(MouseEvent event) fixed the issue.

[@spen9579]

youre a real hero, you just saved me hours of desperate troubleshooting. : )

[@Gurryg]

Great tutorial, thanks for the upload!
For anyone else having issues with adding images to their treeview, use the 'getClass().getResourceAsStream()' as follows:
TreeItem rootItem = new TreeItem("Files", new ImageView(new Image(getClass().getResourceAsStream("folder_icon.png"))));

[@MyTEAC_UP]

thanks bro

[@benderbg]

Thanks for the tip. I still had error "Cannot infer type arguments for TreeItem" until I manually added imports:
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
I didnt get any tip from IDE. Might help someone else in 2023.

[@mclosz3375]

thanks so much@@benderbg

[@paulstoltjr3783]

thanks for the tip. I was having trouble getting the image to show

[@emreozogul5052]

thanks bro

[@Qw3rtykid3]

I keep getting a NullPointerException when the controller is initializing for the treeView fxml variable (I have definitely tagged the TreeView with the fx:id="treeView" tag)_

[@denismarincas377]

did you fix it?

[@ethanalkout949]

First