I have two scenes in my javaFx project .. the first one Language.fxml has a button which on click changes the scene to allDevices.fxml .. but it throws NullPointerException saying "Location is required" although both of the fxml files are in the same path !!
that's my LanguageController.java
package astrolabe;
import java.net.URL;
import java.util.ResourceBundle;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.Node;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.stage.Stage;
/**
*
* #author Ahmed Fawzy
*/
public class LanguageController implements Initializable {
#FXML
private Button arabic ;
#Override
public void initialize(URL url, ResourceBundle rb) {
// TODO
arabic.setOnAction(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent event) {
// TODO Auto-generated method stub
try{
Node node=(Node) event.getSource();
Stage stage=(Stage) node.getScene().getWindow();
Parent root = FXMLLoader.load(getClass().getClassLoader().getResource("allDevices.fxml"));/* Exception */
Scene scene = new Scene(root);
stage.setScene(scene);
stage.show();
}
catch(Exception ex)
{
ex.printStackTrace();
}
}
});
}
The problem solved by adding the package name before the fxml file name !
Related
I made a window by using the screen builder program, but after I run it, only a white blank window appears. I think the problem that all variables , which are lblOUTPUT, aren't assigned. I'm a beginner at Scene builder and have been really struggling with this issue because it's my first work.
FXmain
package javaapplication6;
import java.io.IOException;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
/**
*
* #author ammar
*/
public class FXMain extends Application {
#Override
public void start(Stage stage) throws IOException {
Parent root = FXMLLoader.load(getClass().getResource("/javaapplication6/FXML.fxml"));
Scene scene = new Scene(root, 600, 400);
stage.setScene(scene);
stage.setTitle("Kilometer to miles converter");
stage.show();
}
/**
* #param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
}
FXMLcontroller:
enter code here
package javaapplication6;
import java.net.URL;
import java.util.ResourceBundle;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
/**
* FXML Controller class
*
* #author ammar
*/
public class FXMLController implements Initializable {
#FXML
private Label lblOUTPUT;
#FXML
private Button btnCONVERT;
#FXML
private TextField txtKm;
/**
* Initializes the controller class.
*/
#Override
public void initialize(URL url, ResourceBundle rb) {
// TODO
}
}
Ok, I solved after two hours of struggling, I just click the run button in the NetBeans (looks like a play button) and after that, right-click on the main class, then run the file, and it worked!.
Why my code is not running? How am I going to display an image on the interface when clicked "add image"?
import javafx.stage.Stage;
import javafx.scene.*;
import javafx.application.Application;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
public class GUIProject extends Application{
/**
* #param args the command line arguments
*/
public void start (Stage stage) throws Exception
{
Pane bPane = new Pane();
Button btOK = new Button("OK");
OKAction OKact = new OKAction();
btOK.setOnAction(OKact);
Button addImage = new Button("Add Image");
isAdd addimage = new isAdd();
addImage.setOnAction(addimage);
//bPane.getChildren().add(btOK);
bPane.getChildren().add(addImage);
Scene scene = new Scene(bPane);
stage.setScene(scene);
stage.show();
}
public static void main(String[] args) {
// TODO code application logic here
Application.launch(args);
}
}
import java.io.FileInputStream;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.StackPane;
public class Pane extends StackPane {
public void addImage() throws Exception
{
Image logo = new Image(new FileInputStream("logo.jpg"));
ImageView logoView = new ImageView(logo);
this.getChildren().add(logoView);
}
}
import java.io.FileInputStream;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.BorderPane;
class isAdd implements EventHandler<ActionEvent>{
public void handle(ActionEvent event)
{
try {
Pane.displayImage();
}
catch (Exception ex) {
System.out.println("Error");;
}
}
}
It keep showing static method cannot with non-static method, how can I solve that?
Is there any website can learn javafx event handler?
I am begging with JavaFx, and I realized that I need some help to update a TreeView with some TreeItems in runtime, and it should be updated in the main window.
Here, you can see a screenshot of the two windows:
The bigger is the main window and it calls (by clicking in File >> New Project), new smaller. In the smaller window, I could get the String that is typed and than the enter button is clicked.
The trouble is: How can I show the new items created by the "new project window" (the smaller window in the pic) in the TreeView in the main window(the bigger)?
The treeview is in the left side of the main window.
I hope I was clear.
Here is the code of the controllers of these windows:
package application;
import java.net.URL;
import java.util.ResourceBundle;
import javafx.beans.value.ChangeListener;
import javafx.event.ActionEvent;
import javafx.event.Event;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.MenuItem;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeItem.TreeModificationEvent;
import javafx.scene.control.TreeView;
import javafx.stage.Modality;
import javafx.stage.Stage;
/**
* this class handles with the main window of our LDF Tool
* #author Vinicius
* #version 1.0
*/
public class MainController implements Initializable{
#FXML
TreeView<String> treeView;
#FXML
MenuItem newProject;
private boolean flag = false;
private NewProjectWindowController npwc;
#Override
public void initialize(URL location, ResourceBundle resources) {
}
#FXML
public void newProjectClicked(ActionEvent event){
try{
flag = true;
FXMLLoader fxml = new FXMLLoader(getClass().getResource("newProjectWindow.fxml"));
Parent root = (Parent) fxml.load();
Stage newWindow = new Stage();
newWindow.setTitle("New Project");
newWindow.initModality(Modality.APPLICATION_MODAL);
newWindow.setScene(new Scene(root));
newWindow.show();
} catch (Exception e) {
System.out.println("caiu na exceção");
}
}
/**
* to this method, choose the project's name as argument, and it will be put on the
* tree with the archives that should be created together
* #param projectName
*/
public void doTree(String projectName){
TreeItem<String> root = new TreeItem<>("projectName");
root.setExpanded(true);
//TreeItem<String> folha1 = new TreeItem<String>(projectName + " arquivo 1");
//root.getChildren().add(folha1);
treeView.setRoot(root);
}
The other controller class:
package application;
import java.io.IOException;
import java.net.URL;
import java.util.ResourceBundle;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.stage.Stage;
public class NewProjectWindowController implements Initializable{
#Override
public void initialize(URL location, ResourceBundle resources) {
}
#FXML
Button cancelButton;
#FXML
Button enterButton;
#FXML
TextField textInput;
private String input;
public String getInput(){
return this.input;
}
#FXML
public void cancelButtonClicked(ActionEvent event) {
Stage window = (Stage) this.cancelButton.getParent().getScene().getWindow();
window.close();
}
#FXML
public void enterButtonClicked(ActionEvent event) {
input = hasString();
Stage window = (Stage) this.enterButton.getParent().getScene().getWindow();
window.close();
}
private String hasString(){
if (this.textInput.getText().isEmpty())
return null;
return this.textInput.getText();
}
}
Please, assume that I mapped everything ok in the FXML file.
thanks
#FXML
public void newProjectClicked(ActionEvent event){
try{
flag = true;
FXMLLoader fxml = new FXMLLoader(getClass().getResource("newProjectWindow.fxml"));
Parent root = (Parent) fxml.load();
Stage newWindow = new Stage();
newWindow.setTitle("New Project");
newWindow.initModality(Modality.APPLICATION_MODAL);
newWindow.setScene(new Scene(root));
// showAndWait blocks execution until the window closes:
newWindow.showAndWait();
NewProjectWindowController controller = fxml.getController();
String input = controller.getInput();
if (input != null) {
TreeItem<String> currentItem = treeView.getSelectionModel().getSelectedItem();
if (currentItem == null) currentItem = treeView.getRoot();
currentItem.getChildren().add(new TreeItem<>(input));
}
} catch (Exception e) {
System.out.println("caiu na exceção");
}
}
I launch my application using this Main.java file:
package application;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.stage.Stage;
import javafx.scene.Parent;
import javafx.scene.Scene;
public class Main extends Application {
Parent root;
#Override
public void start(Stage stage) throws Exception {
root = FXMLLoader.load(getClass().getResource("../fxml/mainpage.fxml"));
Scene scene = new Scene(root);
stage.setTitle("Smart City - Main Page");
stage.setScene(scene);
stage.setMaximized(true);
stage.show();
}
public static void main(String[] args) {
launch(args);
}
}
I also created a class named ScreenChanger.java:
package utils;
import java.io.IOException;
import javafx.event.Event;
import javafx.fxml.FXMLLoader;
import javafx.scene.Node;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class ScreenChanger {
public static void screenChanger(Event event, String path, String title) throws IOException{
Parent root = FXMLLoader.load(getClass().getResource(path));
Scene scene = new Scene(root);
Stage stage = (Stage) ((Node) event.getSource()).getScene().getWindow();
stage.setScene(scene);
stage.setTitle(title);
stage.setMaximized(false);
stage.setMaximized(true);
stage.show();
}
}
The problem is that sometimes I haven't that Event in my code when I want to switch between scenes. I would like to use something else instead of Stage stage = (Stage) ((Node) event.getSource()).getScene().getWindow(); in order to change the screen.
I am attempting to switch scenes from a login screen to the main screen of my program but whenever I try to switch scenes after clicking login, I get the following error.
"Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException"
I've messed around with my code and try to change some things to get different results but no dice. This is my first time doing a GUI so any help would be appreciated.
package pwmanager;
import java.io.IOException;
import java.net.URL;
import java.util.ResourceBundle;
import javafx.event.ActionEvent;
import javafx.event.EventType;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.AnchorPane;
import javafx.scene.layout.GridPane;
import javafx.stage.Stage;
/**
*
* #author 176878
*/
public class FXMLDocumentController implements Initializable {
#FXML
private Button loginButton;
#FXML
Stage prevStage;
Stage currentStage;
public void setPrevStage(Stage stage){
this.prevStage = stage;
}
#FXML
public void getPrevStage(Stage stage){
this.currentStage = prevStage;
}
#FXML
public void loginButtonAction(ActionEvent event) throws IOException {
System.out.println("You clicked me, logging in!");
setPrevStage(prevStage);
Stage stage = new Stage();
try{
FXMLLoader loader = new FXMLLoader(getClass().getResource("MainScreen.fxml"));
GridPane mainScreen = (GridPane) loader.load();
Scene scene = new Scene(mainScreen);
stage.setScene(scene);
stage.setTitle("Password Manager");
stage.show();
prevStage.hide();
}
catch(IOException e){
System.out.println("Did not load right");
}
}
#Override
public void initialize(URL url, ResourceBundle rb) {
// TODO
}
}