ListView did not show items in app. Why not? - javafx

Question

I got items on my listview roles but they are not showing in my program after running in window. Gui done in Scene Builder. When i run program field where should be items is white blank just empty.
printscreen of program
https://zapodaj.net/c60f99a10f300.jpg.html
scene builder
https://zapodaj.net/26fbf2123397c.jpg.html
When i use show sample data in Scene Builder it shows lorem ipsum etc.
here u got code from controller and fmxl document.
package sample;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import javafx.scene.control.ListView;
import javafx.scene.control.SelectionMode;
import java.net.URL;
import java.util.*;
public class ControllerBindColors implements Initializable {
#FXML
private ListView<String > roles;
#FXML
private ListView<String> colors;
#FXML
private ListView<?> binded;
String selectedRole;
String selectedColor;
int numberOfPlayers;
#Override
public void initialize(URL location, ResourceBundle resources) {
}
public void initData(int numberOfPlayers, String selectedRole, String selectedColor) {
this.numberOfPlayers = numberOfPlayers;
this.selectedRole = selectedRole;
this.selectedColor = selectedColor;
ObservableList<String> itemsRoles = FXCollections.observableArrayList("test","test2","test3");
roles = new ListView<>();
roles.setItems(itemsRoles);
roles.getItems().addAll("test555");
roles.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);
System.out.println(roles.getItems());
}
}
fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.ListView?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.layout.VBox?>
<VBox spacing="10.0" xmlns="http://javafx.com/javafx/10.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.ControllerBindColors">
<children>
<HBox alignment="CENTER">
<children>
<ListView fx:id="roles" prefHeight="200.0" prefWidth="200.0" />
<VBox alignment="CENTER" spacing="10.0">
<children>
<Button fx:id="backBtn" ellipsisString="BACK" mnemonicParsing="false" onAction="#back" text="BACK" />
<Label prefHeight="51.0" prefWidth="71.0" text="Select role and color then bind." textAlignment="CENTER" wrapText="true" />
<Button fx:id="bindbtn" ellipsisString="BIND" mnemonicParsing="false" onAction="#bind" text="BIND" />
<Button fx:id="nextBtn" ellipsisString="NEXT" mnemonicParsing="false" onAction="#next" text="NEXT" />
</children>
<opaqueInsets>
<Insets />
</opaqueInsets>
</VBox>
<ListView fx:id="colors" prefHeight="200.0" prefWidth="200.0" />
</children>
</HBox>
<ListView fx:id="binded" prefHeight="200.0" prefWidth="200.0" />
</children>
<padding>
<Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
</padding>
</VBox>
initData
ControllerNewGame.java startGame() is called when is activaded button
#FXML
void startGame() {
try{
Parent root= FXMLLoader.load(getClass().getResource("BindColor.fxml"));
ControllerBindColors controller = new ControllerBindColors();
int number = (int)slider.getValue();
controller.initData(number,selectedRole.getText(),selectedColor.getText());
Stage toGame = (Stage)startButton.getScene().getWindow();
toGame.setTitle("Parasite Pip-Boy Bind Color Menu");
toGame.setScene(new Scene(root, 600, 300));
toGame.show();
}catch(IOException e) {
startButton.setText("Reinstall program. BindColor.fxml is missing or is corrupted. :(");
}
}
list has items for sure in console there are printed all 4 items
[test, test2, test3, test555]

Answer 1

To get a reference to the controller used by the FXML (instead of constructing a new one):
FXMLLoader loader = new FXMLLoader();
Parent root= loader.load(getClass().getResource("BindColor.fxml").openStream());
ControllerBindColors controller = fxmlLoader.getController();
after getting a reference to it, you can use it as you did:
controller.initData(number,selectedRole.getText(),selectedColor.getText());