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Javafx进度指示器没有'；设置进度指示器时不显示。设置可见（true）

java javafx

Javafx进度指示器没有'；设置进度指示器时不显示。设置可见（true）,java,javafx,fxml,visible,progress-indicator,Java,Javafx,Fxml,Visible,Progress Indicator,我的JavaFX应用程序在另一个文件夹下的一个级别上计算每个文件夹的文件夹大小。我的问题是，当我点击apply按钮（在另一个类中开始计算）时，我想要一个不确定的进度指示器来向用户显示应用程序正在工作，并且没有挂断。默认情况下，进度指示器设置为不可见，在计算过程中仅设置为可见。不幸的是，当我打电话给它时，它没有出现。我不确定，但当计算完成，数据设置为JavaFX.Pie-Chart时，我可能已经看到了指标 我已经尝试过在默认情况下将指示器设置为可见，并简单地用一个新的矩形覆盖它，但这也不起作用 控

我的JavaFX应用程序在另一个文件夹下的一个级别上计算每个文件夹的文件夹大小。我的问题是，当我点击apply按钮（在另一个类中开始计算）时，我想要一个不确定的进度指示器来向用户显示应用程序正在工作，并且没有挂断。默认情况下，进度指示器设置为不可见，在计算过程中仅设置为可见。不幸的是，当我打电话给它时，它没有出现。我不确定，但当计算完成，数据设置为JavaFX.Pie-Chart时，我可能已经看到了指标

我已经尝试过在默认情况下将指示器设置为可见，并简单地用一个新的矩形覆盖它，但这也不起作用

控制器：

package sample;

import javafx.animation.Interpolator;
import javafx.animation.KeyFrame;
import javafx.animation.KeyValue;
import javafx.animation.Timeline;
import javafx.application.Platform;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.chart.PieChart;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.ProgressIndicator;
import javafx.scene.control.TextField;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.AnchorPane;
import javafx.scene.layout.VBox;
import javafx.scene.shape.Rectangle;
import javafx.stage.DirectoryChooser;
import javafx.stage.Stage;
import javafx.util.Duration;

import java.io.File;
import java.io.IOException;
import java.nio.file.Paths;

public class Controller {

    @FXML
    private PieChart pieChart;
    @FXML
    private TextField pathField;
    @FXML
    private Label subfolder;
    @FXML
    private Button up;
    @FXML
    private Button hide;
    @FXML
    private Button showHidden;
    @FXML
    private VBox field1;
    @FXML
    private VBox field2;
    @FXML
    private VBox field3;
    @FXML
    private VBox field4;
    @FXML
    private AnchorPane parentContainer;
    @FXML
    private ProgressIndicator loading;



    private ObservableList<PieChart.Data> pieChartData;
    private Calc calc;
    public File directory;
    String[] unit = {"Bytes", "KB", "MB", "GB", "TB", "PB", "ZB", "EB"};
    int units = 0;
    boolean hideSegment = false;
    String[] hiddenPath = new String[500];
    double[] hiddenSize = new double[500];
    int Stelle = 499;
    boolean first = true;

    @FXML
    void initialize(){
        pieChartData = FXCollections.observableArrayList();
        calc = new Calc(pieChartData);
        updataLabads();
        pieChart.setData(pieChartData);
    }

    @FXML
    private void handleBrowse(){
        Stage stage = new Stage();
        final DirectoryChooser dirChooser = new DirectoryChooser();
        directory = dirChooser.showDialog(stage);
        if(directory != null){
            pathField.setText(directory.toString());
        }
    }

    @FXML
    private void apply(){
        loading.setVisible(true);
        directory = Paths.get(pathField.getText()).toFile();
        if(directory!=null){
            pieChartData.clear();
            String strings = new String(pathField.getText());
            calc.calcSubfoldersSize(strings);
            updataLabads();
        }
        loading.setVisible(false);
    }

    public void updataLabads(){
        pieChart.getData().forEach(data -> {
            data.getNode().addEventHandler(MouseEvent.MOUSE_ENTERED, e -> {

                for(int i=0;(data.getPieValue()/(Math.pow(1024, i))) > 1000;i++){
                    //System.out.println(i);
                    units = i+1;
                }
                subfolder.setText(data.getName() + ", " + Math.round(data.getPieValue()/(Math.pow(1024,units))) + " " + unit[units]);
                //System.out.println(Math.round(data.getPieValue()/(Math.pow(1024,units))) + " " + unit[units]);
            });
        });
        pieChart.getData().forEach(data -> {
            data.getNode().addEventHandler(MouseEvent.MOUSE_RELEASED, e -> {
                if(hideSegment == false){
                    pathField.setText(pathField.getText() + "\\" + data.getName());
                    apply();
                }else if(hideSegment == true){
                    pieChartData.remove(data);
                    hideSegment = false;
                    if(first == true){
                        first = false;
                        Stelle = 0;
                    }
                    hiddenPath[Stelle] = data.getName();
                    hiddenSize[Stelle] = data.getPieValue();
                    System.out.println("Hidden Variables have been updatet on Port " + Stelle);
                    Stelle++;
                    pieChart.setData(pieChartData);
                }
            });
        });
    }

    @FXML
    private void up(){
        while(!pathField.getText().substring(pathField.getText().length()-1).equals("\\")){
            pathField.setText(pathField.getText().substring(0, pathField.getText().length()-1));
        }
        pathField.setText(pathField.getText().substring(0, pathField.getText().length()-1));
        apply();
    }

    @FXML
    public void hide(){
        if(hideSegment == false)hideSegment = true;
        else if(hideSegment == true)hideSegment = false;
    }

    @FXML
    public void showHidden(){
        System.out.println("Tried to load HiddenVariables on Port " + (Stelle-1));
        System.out.println(hiddenPath[Stelle-1] + "   " + hiddenSize[Stelle-1]);
        if(!hiddenPath[Stelle-1].equals(null)){
            for(int i=Stelle; i!=0; i--){
                pieChartData.add(new PieChart.Data(hiddenPath[Stelle-1], hiddenSize[Stelle-1]));
                hiddenPath[Stelle-1] = "";
                hiddenSize[Stelle-1] = 0;
                Stelle--;
                pieChart.setData(pieChartData);
                updataLabads();
            }
        }
    }

    @FXML
    public void Home() throws IOException {
        Parent root = FXMLLoader.load(getClass().getResource("Home.fxml"));
        Scene scene = up.getScene();
        root.translateYProperty().set(scene.getHeight());
        parentContainer.getChildren().add(root);
        Timeline timeline = new Timeline();
        KeyValue kv = new KeyValue(root.translateYProperty(), 0 , Interpolator.EASE_BOTH);
        KeyFrame kf = new KeyFrame(Duration.seconds(.5), kv);
        timeline.getKeyFrames().add(kf);
        timeline.play();
        parentContainer.getChildren().remove(parentContainer);
    }

    @FXML
    public void Files(){}

    @FXML
    public void Settings(){}

    @FXML
    public void Close(){
        Platform.exit();
    }
}
控制器类：

package sample;

import javafx.animation.Interpolator;
import javafx.animation.KeyFrame;
import javafx.animation.KeyValue;
import javafx.animation.Timeline;
import javafx.application.Platform;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.concurrent.Task;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.chart.PieChart;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.ProgressIndicator;
import javafx.scene.control.TextField;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.AnchorPane;
import javafx.scene.layout.VBox;
import javafx.scene.shape.Rectangle;
import javafx.stage.DirectoryChooser;
import javafx.stage.Stage;
import javafx.util.Duration;

import java.io.File;
import java.io.IOException;
import java.nio.file.Paths;

public class Controller {

    @FXML
    private PieChart pieChart;
    @FXML
    private TextField pathField;
    @FXML
    private Label subfolder;
    @FXML
    private Button up;
    @FXML
    private Button hide;
    @FXML
    private Button showHidden;
    @FXML
    private VBox field1;
    @FXML
    private VBox field2;
    @FXML
    private VBox field3;
    @FXML
    private VBox field4;
    @FXML
    private AnchorPane parentContainer;
    @FXML
    private ProgressIndicator loading;



    private ObservableList<PieChart.Data> pieChartData;
    private Calc calc;
    public File directory;
    String[] unit = {"Bytes", "KB", "MB", "GB", "TB", "PB", "ZB", "EB"};
    int units = 0;
    boolean hideSegment = false;
    String[] hiddenPath = new String[500];
    double[] hiddenSize = new double[500];
    int Stelle = 499;
    boolean first = true;


    @FXML
    private void handleBrowse(){
        Stage stage = new Stage();
        final DirectoryChooser dirChooser = new DirectoryChooser();
        directory = dirChooser.showDialog(stage);
        if(directory != null){
            pathField.setText(directory.toString());
        }
    }

    @FXML
    private void apply() {
        loading.setVisible(true);

        Task<Void> applyTask = new Task<Void>() {

            @Override
            protected Void call() throws Exception {

                Thread.sleep(0);//sleep for 10 seconds just to show that the progress indicator is working

                directory = Paths.get(pathField.getText()).toFile();
                if (directory != null) {
                    //fx-parts need to be executed by Platform.runLater(...)
                    Platform.runLater(() -> pieChartData.clear());
                    String strings = new String(pathField.getText());
                    calc.calcSubfoldersSize(strings);
                    //again let fx-parts be executed in the fx-application-thread
                    Platform.runLater(() -> updataLabads());
                }

                return null;
            }
        };

        applyTask.setOnSucceeded(e -> loading.setVisible(false));
        applyTask.setOnFailed(e -> loading.setVisible(false));//handle error here...

        new Thread(applyTask, "Apply thread").start();

        //loading.setVisible(false); //done when the task ends
    }

    public void updataLabads(){
        pieChart.getData().forEach(data -> {
            data.getNode().addEventHandler(MouseEvent.MOUSE_ENTERED, e -> {

                for(int i=0;(data.getPieValue()/(Math.pow(1024, i))) > 1000;i++){
                    //System.out.println(i);
                    units = i+1;
                }
                subfolder.setText(data.getName() + ", " + Math.round(data.getPieValue()/(Math.pow(1024,units))) + " " + unit[units]);
                //System.out.println(Math.round(data.getPieValue()/(Math.pow(1024,units))) + " " + unit[units]);
            });
        });
        pieChart.getData().forEach(data -> {
            data.getNode().addEventHandler(MouseEvent.MOUSE_RELEASED, e -> {
                if(hideSegment == false){
                    pathField.setText(pathField.getText() + "\\" + data.getName());
                    apply();
                }else if(hideSegment == true){
                    pieChartData.remove(data);
                    hideSegment = false;
                    if(first == true){
                        first = false;
                        Stelle = 0;
                    }
                    hiddenPath[Stelle] = data.getName();
                    hiddenSize[Stelle] = data.getPieValue();
                    System.out.println("Hidden Variables have been updatet on Port " + Stelle);
                    Stelle++;
                    pieChart.setData(pieChartData);
                }
            });
        });
    }

    @FXML
    private void up(){
        while(!pathField.getText().substring(pathField.getText().length()-1).equals("\\")){
            pathField.setText(pathField.getText().substring(0, pathField.getText().length()-1));
        }
        pathField.setText(pathField.getText().substring(0, pathField.getText().length()-1));
        apply();
    }

    @FXML
    public void hide(){
        if(hideSegment == false)hideSegment = true;
        else if(hideSegment == true)hideSegment = false;
    }

    @FXML
    public void showHidden(){
        System.out.println("Tried to load HiddenVariables on Port " + (Stelle-1));
        System.out.println(hiddenPath[Stelle-1] + "   " + hiddenSize[Stelle-1]);
        if(!hiddenPath[Stelle-1].equals(null)){
            for(int i=Stelle; i!=0; i--){
                pieChartData.add(new PieChart.Data(hiddenPath[Stelle-1], hiddenSize[Stelle-1]));
                hiddenPath[Stelle-1] = "";
                hiddenSize[Stelle-1] = 0;
                Stelle--;
                pieChart.setData(pieChartData);
                updataLabads();
            }
        }
    }

    public void initialize(){
        pieChartData = FXCollections.observableArrayList();
        updataLabads();
        calc = new Calc(pieChartData);
        pieChart.setData(pieChartData);
    }

    @FXML
    public void Home() throws IOException {
        Parent root = FXMLLoader.load(getClass().getResource("Home.fxml"));
        Scene scene = up.getScene();
        root.translateYProperty().set(scene.getHeight());
        parentContainer.getChildren().add(root);
        Timeline timeline = new Timeline();
        KeyValue kv = new KeyValue(root.translateYProperty(), 0 , Interpolator.EASE_BOTH);
        KeyFrame kf = new KeyFrame(Duration.seconds(.5), kv);
        timeline.getKeyFrames().add(kf);
        timeline.play();
        parentContainer.getChildren().remove(parentContainer);
    }

    @FXML
    public void Files(){}

    @FXML
    public void Settings(){}

    @FXML
    public void Close(){
        Platform.exit();
    }
}

包装样品；
导入javafx.animation.Interpolator；
导入javafx.animation.KeyFrame；
导入javafx.animation.KeyValue；
导入javafx.animation.Timeline；
导入javafx.application.Platform；
导入javafx.collections.FXCollections；
导入javafx.collections.ObservableList；
导入javafx.concurrent.Task；
导入javafx.event.ActionEvent；
导入javafx.fxml.fxml；
导入javafx.fxml.fxmloader；
导入javafx.scene.Parent；
导入javafx.scene.scene；
导入javafx.scene.chart.PieChart；
导入javafx.scene.control.Button；
导入javafx.scene.control.Label；
导入javafx.scene.control.ProgressIndicator；
导入javafx.scene.control.TextField；
导入javafx.scene.input.MouseEvent；
导入javafx.scene.layout.ancorpane；
导入javafx.scene.layout.VBox；
导入javafx.scene.shape.Rectangle；
导入javafx.stage.DirectoryChooser；
导入javafx.stage.stage；
导入javafx.util.Duration；
导入java.io.File；
导入java.io.IOException；
导入java.nio.file.path；
公共类控制器{
@FXML
私人海图；
@FXML
私有文本字段路径字段；
@FXML
私有标签子文件夹；
@FXML
私人按钮；
@FXML
私密按钮隐藏；
@FXML
隐藏的私人按钮；
@FXML
专用VBox字段1；
@FXML
专用VBox字段2；
@FXML
私有VBox字段3；
@FXML
私有VBox字段4；
@FXML
私人锚烷容器；
@FXML
专用指示器加载；
私有可观测数据；
私人计算；
公共文件目录；
字符串[]单位={“字节”、“KB”、“MB”、“GB”、“TB”、“PB”、“ZB”、“EB”}；
整数单位=0；
布尔隐藏段=假；
String[]hiddenPath=新字符串[500]；
double[]hiddenSize=新的double[500]；
int Stelle=499；
布尔值优先=真；
@FXML
专用空心把手{
阶段=新阶段（）；
最终目录选择器dirChooser=新目录选择器（）；
directory=dirChooser.showDialog（阶段）；
if（目录！=null）{
setText（directory.toString（））；
}
}
@FXML
私有无效应用（）{
loading.setVisible（true）；
任务applyTask=新任务（）{
@凌驾
受保护的Void调用（）引发异常{
Thread.sleep（0）；//睡眠10秒只是为了显示进度指示器正在工作
directory=path.get（pathField.getText（））.toFile（）；
if（目录！=null）{
//fx部件需要由Platform.runLater（…）执行
Platform.runLater（（）->pieChartData.clear（））；
String strings=新字符串（pathField.getText（））；
calc.calcSubfoldersSize（字符串）；
//再次让fx部件在fx应用程序线程中执行
Platform.runLater（（）->updatealabads（））；
}
返回null；
}
};
applyTask.setonsucceed（e->load.setVisible（false））；
applyTask.setOnFailed（e->loading.setVisible（false））；//此处处理错误。。。
新线程（applyTask，“Apply Thread”）.start（）；
//loading.setVisible（false）；//任务结束时完成
}
public void updatealabads（）{
pieChart.getData（）.forEach（数据->{
data.getNode（）.addEventHandler（MouseEvent.MOUSE_输入，e->{
对于（int i=0；（data.getPieValue（）/（Math.pow（1024，i）））>1000；i++）{
//系统输出打印LN（i）；
单位=i+1；
}
子文件夹.setText（data.getName（）+”，“+Math.round（data.getPieValue（）/（Math.pow（1024，单位）））+”+单位[单位]；
//System.out.println（Math.round（data.getPieValue（）/（Math.pow（1024，单位）））+“”+单位[单位]；
});
});
pieChart.getData（）.forEach（数据->{
data.getNode（）.addEventHandler（MouseEvent.MOUSE_已发布，e->{
if（hideSegment==false）{
setText（pathField.getText（）+“\\”+data.getName（））；
应用（）；
}else if（hideSegment==true）{
pieChartData。删除（数据）；
hideSegment=false；
if（first==true）{
第一个=假；
Stelle=0；
}
hiddenPath[Stelle]=data.getName（）；
hiddenSize[Stelle]=data.getPieValue（）；
System.out.println（“端口上的隐藏变量已更新”+Stelle）；
Stelle++；
pieChart.setData（pieChartData）；
}
});
});
}
@FXML
私人作废{
而（！pathField.getText（）.substring（pathField.getText（）.length（）-1）.equals（“\\”）{
setText（pathField.getText（）.substring（0，pathField.getText（）.length（）-1））；
}
pathField.setText（pathField.getText（）.substring（0，pathField.getText（）.length（）-1

package sample;

import java.io.File;
import java.nio.file.Path;
import java.nio.file.Paths;
import javafx.collections.ObservableList;
import javafx.scene.chart.PieChart;

public class Calc {

    private int totalFolder=0, totalFile=0;
    private static int counter = 0;
    private final ObservableList<PieChart.Data> pieChartData;
    private long filesInRoot = 0;
    Path fileInRoot;


    //added a constructor to receive a reference of the Observable list
    public Calc(ObservableList<PieChart.Data> pieChartData) {
        this.pieChartData = pieChartData;
    }


    public void calcSubfoldersSize(String sPath) { //replaces public void main(String args)

        File nativeFile = new File(sPath);
        File file = new File(nativeFile.toString());

        String[] files = file.list();
        Path path;

        filesInRoot = 0;
        if(file.isDirectory()) {
            for(int i=0; i<=files.length-1; i++) {
                path = Paths.get(files[i]);
                file = path.toFile();
                counter ++;
            }

            String[] paths = new String[counter];
            for(int i=0; i<=files.length-1; i++) {
                path = Paths.get(files[i]);
                file = path.toFile();
                paths[i] = file.toString();
            }

            for(int i=0; i!=counter; i++) {

            }
            for(int i = 0; i+1 <= paths.length; i++) {
                try {
                    Calc size = new Calc(pieChartData); //the only line changed in the method
                    long fileSizeByte = size.getFileSize(new File(nativeFile.toString() + "\\" + paths[i]));
                    add(paths[i],fileSizeByte,i,paths.length);
                } catch (Exception e) {
                    fileInRoot = Paths.get(nativeFile.toString()+"\\" + paths[i]);
                    filesInRoot = filesInRoot + fileInRoot.toFile().length();
                }
            }
            if(filesInRoot!=0){
                pieChartData.add(new PieChart.Data("Files in Directory",filesInRoot));
                System.out.println(filesInRoot);
            }
        }
    }

    //let add update the observable list
    public void add(String loc, long size, int i, int aim){
        pieChartData.add(new PieChart.Data(loc,size));
    }

    public long getFileSize(File folder) {
        long foldersize = 0;

        totalFolder++;
//          System.out.println("Folder: " + folder + "  (Source: getFileSize)");
        File[] filelist = folder.listFiles();
//          System.out.println(folder.listFiles());

        for (int i = 0; i < filelist.length; i++) {
            if (filelist[i].isDirectory()) {
                foldersize += getFileSize(filelist[i]);
            } else {
                totalFile++;
                foldersize += filelist[i].length();
            }
        }

        return foldersize;

    }

    public int getTotalFolder() {
        return totalFolder;
    }

    public int getTotalFile() {
        return totalFile;
    }
}




package sample;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{
        Parent root = FXMLLoader.load(getClass().getResource("Files.fxml"));
        primaryStage.setTitle("Fileview.io");
        primaryStage.setScene(new Scene(root));
        primaryStage.setResizable(false);
        primaryStage.show();
    }


    public static void main(String[] args) {
        launch(args);
    }
}



package sample;

import javafx.animation.Interpolator;
import javafx.animation.KeyFrame;
import javafx.animation.KeyValue;
import javafx.animation.Timeline;
import javafx.application.Platform;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.concurrent.Task;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.chart.PieChart;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.ProgressIndicator;
import javafx.scene.control.TextField;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.AnchorPane;
import javafx.scene.layout.VBox;
import javafx.scene.shape.Rectangle;
import javafx.stage.DirectoryChooser;
import javafx.stage.Stage;
import javafx.util.Duration;

import java.io.File;
import java.io.IOException;
import java.nio.file.Paths;

public class Controller {

    @FXML
    private PieChart pieChart;
    @FXML
    private TextField pathField;
    @FXML
    private Label subfolder;
    @FXML
    private Button up;
    @FXML
    private Button hide;
    @FXML
    private Button showHidden;
    @FXML
    private VBox field1;
    @FXML
    private VBox field2;
    @FXML
    private VBox field3;
    @FXML
    private VBox field4;
    @FXML
    private AnchorPane parentContainer;
    @FXML
    private ProgressIndicator loading;



    private ObservableList<PieChart.Data> pieChartData;
    private Calc calc;
    public File directory;
    String[] unit = {"Bytes", "KB", "MB", "GB", "TB", "PB", "ZB", "EB"};
    int units = 0;
    boolean hideSegment = false;
    String[] hiddenPath = new String[500];
    double[] hiddenSize = new double[500];
    int Stelle = 499;
    boolean first = true;


    @FXML
    private void handleBrowse(){
        Stage stage = new Stage();
        final DirectoryChooser dirChooser = new DirectoryChooser();
        directory = dirChooser.showDialog(stage);
        if(directory != null){
            pathField.setText(directory.toString());
        }
    }

    @FXML
    private void apply() {
        loading.setVisible(true);

        Task<Void> applyTask = new Task<Void>() {

            @Override
            protected Void call() throws Exception {

                Thread.sleep(0);//sleep for 10 seconds just to show that the progress indicator is working

                directory = Paths.get(pathField.getText()).toFile();
                if (directory != null) {
                    //fx-parts need to be executed by Platform.runLater(...)
                    Platform.runLater(() -> pieChartData.clear());
                    String strings = new String(pathField.getText());
                    calc.calcSubfoldersSize(strings);
                    //again let fx-parts be executed in the fx-application-thread
                    Platform.runLater(() -> updataLabads());
                }

                return null;
            }
        };

        applyTask.setOnSucceeded(e -> loading.setVisible(false));
        applyTask.setOnFailed(e -> loading.setVisible(false));//handle error here...

        new Thread(applyTask, "Apply thread").start();

        //loading.setVisible(false); //done when the task ends
    }

    public void updataLabads(){
        pieChart.getData().forEach(data -> {
            data.getNode().addEventHandler(MouseEvent.MOUSE_ENTERED, e -> {

                for(int i=0;(data.getPieValue()/(Math.pow(1024, i))) > 1000;i++){
                    //System.out.println(i);
                    units = i+1;
                }
                subfolder.setText(data.getName() + ", " + Math.round(data.getPieValue()/(Math.pow(1024,units))) + " " + unit[units]);
                //System.out.println(Math.round(data.getPieValue()/(Math.pow(1024,units))) + " " + unit[units]);
            });
        });
        pieChart.getData().forEach(data -> {
            data.getNode().addEventHandler(MouseEvent.MOUSE_RELEASED, e -> {
                if(hideSegment == false){
                    pathField.setText(pathField.getText() + "\\" + data.getName());
                    apply();
                }else if(hideSegment == true){
                    pieChartData.remove(data);
                    hideSegment = false;
                    if(first == true){
                        first = false;
                        Stelle = 0;
                    }
                    hiddenPath[Stelle] = data.getName();
                    hiddenSize[Stelle] = data.getPieValue();
                    System.out.println("Hidden Variables have been updatet on Port " + Stelle);
                    Stelle++;
                    pieChart.setData(pieChartData);
                }
            });
        });
    }

    @FXML
    private void up(){
        while(!pathField.getText().substring(pathField.getText().length()-1).equals("\\")){
            pathField.setText(pathField.getText().substring(0, pathField.getText().length()-1));
        }
        pathField.setText(pathField.getText().substring(0, pathField.getText().length()-1));
        apply();
    }

    @FXML
    public void hide(){
        if(hideSegment == false)hideSegment = true;
        else if(hideSegment == true)hideSegment = false;
    }

    @FXML
    public void showHidden(){
        System.out.println("Tried to load HiddenVariables on Port " + (Stelle-1));
        System.out.println(hiddenPath[Stelle-1] + "   " + hiddenSize[Stelle-1]);
        if(!hiddenPath[Stelle-1].equals(null)){
            for(int i=Stelle; i!=0; i--){
                pieChartData.add(new PieChart.Data(hiddenPath[Stelle-1], hiddenSize[Stelle-1]));
                hiddenPath[Stelle-1] = "";
                hiddenSize[Stelle-1] = 0;
                Stelle--;
                pieChart.setData(pieChartData);
                updataLabads();
            }
        }
    }

    public void initialize(){
        pieChartData = FXCollections.observableArrayList();
        updataLabads();
        calc = new Calc(pieChartData);
        pieChart.setData(pieChartData);
    }

    @FXML
    public void Home() throws IOException {
        Parent root = FXMLLoader.load(getClass().getResource("Home.fxml"));
        Scene scene = up.getScene();
        root.translateYProperty().set(scene.getHeight());
        parentContainer.getChildren().add(root);
        Timeline timeline = new Timeline();
        KeyValue kv = new KeyValue(root.translateYProperty(), 0 , Interpolator.EASE_BOTH);
        KeyFrame kf = new KeyFrame(Duration.seconds(.5), kv);
        timeline.getKeyFrames().add(kf);
        timeline.play();
        parentContainer.getChildren().remove(parentContainer);
    }

    @FXML
    public void Files(){}

    @FXML
    public void Settings(){}

    @FXML
    public void Close(){
        Platform.exit();
    }
}



@FXML
private void apply() {
    loading.setVisible(true);

    Task<Void> applyTask = new Task<Void>() {

        @Override
        protected Void call() throws Exception {

            Thread.sleep(10000);//sleep for 10 seconds just to show that the progress indicator is working

            directory = Paths.get(pathField.getText()).toFile();
            if (directory != null) {
                //fx-parts need to be executed by Platform.runLater(...)
                Platform.runLater(() -> pieChartData.clear());

                String strings = new String(pathField.getText());
                calc.calcSubfoldersSize(strings);

                //again let fx-parts be executed in the fx-application-thread
                Platform.runLater(() -> updataLabads());
            }

            return null;
        }
    };

    applyTask.setOnSucceeded(e -> loading.setVisible(false));
    applyTask.setOnFailed(e -> loading.setVisible(false));//handle error here...

    new Thread(applyTask, "Apply thread").start();

    //loading.setVisible(false); //done when the task ends
}



package sample;

import java.io.File;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;

import javafx.application.Platform;
import javafx.collections.ObservableList;
import javafx.scene.chart.PieChart;

public class Calc {

    private int totalFolder = 0, totalFile = 0;
    private static int counter = 0;
    private final ObservableList<PieChart.Data> pieChartData;
    private ArrayList<PieChart.Data> pieChartData2;//EDIT: here you don't need an ObservableList, a simple ArrayList will do it
    private long filesInRoot = 0;
    Path fileInRoot;

    //added a constructor to receive a reference of the Observable list
    public Calc(ObservableList<PieChart.Data> pieChartData) {
        this.pieChartData = pieChartData;//EDIT: when you set this.pieChartData = pieChartData2 the parameter would be ignored...
        pieChartData2 = new ArrayList<PieChart.Data>();
    }

    public void calcSubfoldersSize(String sPath) { //replaces public void main(String args)
        File nativeFile = new File(sPath);
        File file = new File(nativeFile.toString());

        String[] files = file.list();
        Path path;

        filesInRoot = 0;
        if (file.isDirectory()) {
            for (int i = 0; i <= files.length - 1; i++) {
                path = Paths.get(files[i]);
                file = path.toFile();
                counter++;
            }

            String[] paths = new String[counter];
            for (int i = 0; i <= files.length - 1; i++) {
                path = Paths.get(files[i]);
                file = path.toFile();
                paths[i] = file.toString();
            }

            for (int i = 0; i != counter; i++) {

            }
            for (int i = 0; i + 1 <= paths.length; i++) {
                try {
                    Calc size = new Calc(pieChartData); //the only line changed in the method
                    long fileSizeByte = size.getFileSize(new File(nativeFile.toString() + "\\" + paths[i]));
                    add(paths[i], fileSizeByte, i, paths.length);
                }
                catch (Exception e) {
                    fileInRoot = Paths.get(nativeFile.toString() + "\\" + paths[i]);
                    filesInRoot = filesInRoot + fileInRoot.toFile().length();
                }
            }
            if (filesInRoot != 0) {
                add("Files in Directory", filesInRoot, 1, 100);
                pieChartData2.add(new PieChart.Data("Files in Directory", filesInRoot));
                System.out.println(filesInRoot);
            }
        }

        //EDIT: let this part be executed by the fx-application thread:
        Platform.runLater(() -> pieChartData.addAll(pieChartData2));
    }

    //let add update the observable list
    public void add(String loc, long size, int i, int aim) {
        pieChartData2.add(new PieChart.Data(loc, size));//EDIT: the error seems to occur here because pieChartData2 was null (but I'm not sure why there was no exception shown...; probably because it's executed in the task...) 
    }

    public long getFileSize(File folder) {
        long foldersize = 0;

        totalFolder++;
        //          System.out.println("Folder: " + folder + "  (Source: getFileSize)");
        File[] filelist = folder.listFiles();
        //          System.out.println(folder.listFiles());

        for (int i = 0; i < filelist.length; i++) {
            if (filelist[i].isDirectory()) {
                foldersize += getFileSize(filelist[i]);
            }
            else {
                totalFile++;
                foldersize += filelist[i].length();
            }
        }

        return foldersize;

    }

    public int getTotalFolder() {
        return totalFolder;
    }

    public int getTotalFile() {
        return totalFile;
    }
}



//...
String strings = new String(pathField.getText());
calc.calcSubfoldersSize(strings);
Platform.runLater(() -> initialize());
//...



package sample;

import java.io.File;
import java.io.IOException;
import java.nio.file.Paths;

import javafx.animation.Interpolator;
import javafx.animation.KeyFrame;
import javafx.animation.KeyValue;
import javafx.animation.Timeline;
import javafx.application.Platform;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.concurrent.Task;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.chart.PieChart;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.ProgressIndicator;
import javafx.scene.control.TextField;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.AnchorPane;
import javafx.scene.layout.VBox;
import javafx.stage.DirectoryChooser;
import javafx.stage.Stage;
import javafx.util.Duration;

public class Controller {

    @FXML
    private PieChart pieChart;
    @FXML
    private TextField pathField;
    @FXML
    private Label subfolder;
    @FXML
    private Button up;
    @FXML
    private Button hide;
    @FXML
    private Button showHidden;
    @FXML
    private VBox field1;
    @FXML
    private VBox field2;
    @FXML
    private VBox field3;
    @FXML
    private VBox field4;
    @FXML
    private AnchorPane parentContainer;
    @FXML
    private ProgressIndicator loading;

    private ObservableList<PieChart.Data> pieChartData;
    private Calc calc;
    public File directory;
    String[] unit = {"Bytes", "KB", "MB", "GB", "TB", "PB", "ZB", "EB"};
    int units = 0;
    boolean hideSegment = false;
    String[] hiddenPath = new String[500];
    double[] hiddenSize = new double[500];
    int Stelle = 499;
    boolean first = true;

    @FXML
    void initialize() {
        pieChartData = FXCollections.observableArrayList();
        calc = new Calc(pieChartData);
        updataLabads();
        pieChart.setData(pieChartData);
    }

    @FXML
    private void handleBrowse() {
        Stage stage = new Stage();
        final DirectoryChooser dirChooser = new DirectoryChooser();
        directory = dirChooser.showDialog(stage);
        if (directory != null) {
            pathField.setText(directory.toString());
        }
    }

    @FXML
    private void apply() {
        loading.setVisible(true);

        Task<Void> applyTask = new Task<Void>() {

            @Override
            protected Void call() throws Exception {

                Thread.sleep(3000);//sleep for 3 seconds just to show that the progress indicator is working

                directory = Paths.get(pathField.getText()).toFile();
                if (directory != null) {
                    //fx-parts need to be executed by Platform.runLater(...)
                    Platform.runLater(() -> pieChartData.clear());

                    String strings = new String(pathField.getText());
                    calc.calcSubfoldersSize(strings);

                    //again let fx-parts be executed in the fx-application-thread
                    Platform.runLater(() -> updataLabads());
                }

                return null;
            }
        };

        applyTask.setOnSucceeded(e -> loading.setVisible(false));
        applyTask.setOnFailed(e -> loading.setVisible(false));//handle error here...

        new Thread(applyTask, "Apply thread").start();

        //loading.setVisible(false); //done when the task ends
    }

    public void updataLabads() {
        pieChart.getData().forEach(data -> {
            data.getNode().addEventHandler(MouseEvent.MOUSE_ENTERED, e -> {

                for (int i = 0; (data.getPieValue() / (Math.pow(1024, i))) > 1000; i++) {
                    //System.out.println(i);
                    units = i + 1;
                }
                subfolder.setText(data.getName() + ", " + Math.round(data.getPieValue() / (Math.pow(1024, units))) + " " + unit[units]);
                //System.out.println(Math.round(data.getPieValue()/(Math.pow(1024,units))) + " " + unit[units]);
            });
        });
        pieChart.getData().forEach(data -> {
            data.getNode().addEventHandler(MouseEvent.MOUSE_RELEASED, e -> {
                if (hideSegment == false) {
                    pathField.setText(pathField.getText() + "\\" + data.getName());
                    apply();
                }
                else if (hideSegment == true) {
                    pieChartData.remove(data);
                    hideSegment = false;
                    if (first == true) {
                        first = false;
                        Stelle = 0;
                    }
                    hiddenPath[Stelle] = data.getName();
                    hiddenSize[Stelle] = data.getPieValue();
                    System.out.println("Hidden Variables have been updatet on Port " + Stelle);
                    Stelle++;
                    pieChart.setData(pieChartData);
                }
            });
        });
    }

    @FXML
    private void up() {
        while (!pathField.getText().substring(pathField.getText().length() - 1).equals("\\")) {
            pathField.setText(pathField.getText().substring(0, pathField.getText().length() - 1));
        }
        pathField.setText(pathField.getText().substring(0, pathField.getText().length() - 1));
        apply();
    }

    @FXML
    public void hide() {
        if (hideSegment == false)
            hideSegment = true;
        else if (hideSegment == true)
            hideSegment = false;
    }

    @FXML
    public void showHidden() {
        System.out.println("Tried to load HiddenVariables on Port " + (Stelle - 1));
        System.out.println(hiddenPath[Stelle - 1] + "   " + hiddenSize[Stelle - 1]);
        if (!hiddenPath[Stelle - 1].equals(null)) {
            for (int i = Stelle; i != 0; i--) {
                pieChartData.add(new PieChart.Data(hiddenPath[Stelle - 1], hiddenSize[Stelle - 1]));
                hiddenPath[Stelle - 1] = "";
                hiddenSize[Stelle - 1] = 0;
                Stelle--;
                pieChart.setData(pieChartData);
                updataLabads();
            }
        }
    }

    @FXML
    public void Home() throws IOException {
        Parent root = FXMLLoader.load(getClass().getResource("Home.fxml"));
        Scene scene = up.getScene();
        root.translateYProperty().set(scene.getHeight());
        parentContainer.getChildren().add(root);
        Timeline timeline = new Timeline();
        KeyValue kv = new KeyValue(root.translateYProperty(), 0, Interpolator.EASE_BOTH);
        KeyFrame kf = new KeyFrame(Duration.seconds(.5), kv);
        timeline.getKeyFrames().add(kf);
        timeline.play();
        parentContainer.getChildren().remove(parentContainer);
    }

    @FXML
    public void Files() {}

    @FXML
    public void Settings() {}

    @FXML
    public void Close() {
        Platform.exit();
    }
}