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나는 카드 타입의 아이템을 표시하고있는 listView를 가지고 있습니다. 어플리케이션을 닫은 후, 그 카드 오브젝트를 추출하여 .txt 파일에 저장하고 싶습니다. 그러나 List testingList 및 ListPropeprty listProperty가 비어있는 것처럼 보입니다. 이건 내가 이해할 수있는 이유입니다. NullPointerException을 얻는 이유입니다.이 전체 오류를 계산하려고 시도했지만 압도적 인 것 같습니다. 여기 누군가가 도움이되기를 바랍니다. 나 :javaFX 8의 ListView에서 아이템 저장 및로드하기
package com.spdesigns.dokkancardspreview.model;
import javafx.scene.image.Image;
public class Card {
private String mName;
private String mDescription;
private Image mMainImage;
private Image mSecondaryImage;
private String mMainImagePath;
private String mSecondaryImagePath;
public Card(String name, String description, Image mainImage, Image secondaryImage) {
mName = name;
mDescription = description;
mMainImage = mainImage;
mSecondaryImage = secondaryImage;
}
public Card(String name, String description , String mainImagePath, String secondaryImagePath) {
new Card(name,description,new Image(mainImagePath),new Image(secondaryImagePath));
}
@Override
public String toString() {
return mName + " | " + mDescription;
}
public Image getmMainImage() {
return mMainImage;
}
public Image getmSecondaryImage() {
return mSecondaryImage;
}
public String getName() {
return mName;
}
public String getDescription() {
return mDescription;
}
}
: 여기 내 Card.java입니다package com.spdesigns.dokkancardspreview.controllers;
import com.spdesigns.dokkancardspreview.model.Card;
import javafx.beans.property.ListProperty;
import javafx.beans.property.SimpleListProperty;
import javafx.collections.FXCollections;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import javafx.scene.control.ListView;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import java.io.*;
import java.util.List;
import java.net.URL;
import java.util.ArrayList;
import java.util.ResourceBundle;
public class home implements Initializable {
private Card hit = new Card("Hit","Expanding Possibility",
new Image("/images/hit_main.jpg") , new Image("/images/hit_secondary.jpg"));
private boolean clickedAgain = false;
@FXML
private Button arrowButton;
@FXML
private ImageView imageView;
@FXML
private ImageView arrow;
@FXML
private ListView listView;
protected List<Card> testingList = new ArrayList<Card>();
protected ListProperty<Card> listProperty = new SimpleListProperty<Card>();
@Override
public void initialize(URL location, ResourceBundle resources) {
addCard(hit);
//testingList.add("test2");
listView.itemsProperty().bind(listProperty);
// wrapping our list in an observable list and then pass that observableList to the ListProperty isntance
listProperty.set(FXCollections.observableArrayList(testingList));
// Handle listView selection changes
listView.getSelectionModel().selectedItemProperty().addListener(((observable, oldValue, newValue) -> {
System.out.println("ListView item clicked!");
imageView.setImage(new Image(hit.getmMainImage().impl_getUrl()));
arrow.setVisible(true);
arrowButton.setVisible(true);
}));
arrow.translateYProperty().set(283f);
arrowButton.translateYProperty().set(283f);
arrow.setRotate(180);
arrow.setVisible(false);
arrowButton.setVisible(false);
}
public void handleShowDetails(ActionEvent actionEvent) {
System.out.println("Button Clicked!");
if(clickedAgain) {
imageView.setImage(new Image(hit.getmMainImage().impl_getUrl()));
arrow.setRotate(180);
clickedAgain = false;
} else {
imageView.setImage(new Image(hit.getmSecondaryImage().impl_getUrl()));
arrow.setRotate(360);
clickedAgain = true;
}
}
// Saving
public void exportTo(String fileName) {
try(
FileOutputStream fos = new FileOutputStream(fileName);
PrintWriter writer = new PrintWriter(fos);
){
for(Card card : testingList) {
writer.printf("%s|%s|%s|%s/n",card.getName(),card.getDescription(),
card.getmMainImage().impl_getUrl(),card.getmSecondaryImage().impl_getUrl());
}
} catch (IOException ioe) { // If the file couldn't be opened
System.out.printf("Problem saving: %s/n", fileName);
ioe.printStackTrace();
}
}
// Loading
public void importFrom(String fileName) {
try(
FileInputStream fis = new FileInputStream(fileName);
BufferedReader reader = new BufferedReader(new InputStreamReader(fis));
){
String line;
while((line = reader.readLine()) != null) {
String[] args = line.split("\\|");
this.addCard(new Card(args[0],args[1],args[2],args[3]));
}
} catch (IOException ioe) {
System.out.printf("Problem loading: %S/n" , fileName);
ioe.printStackTrace();
}
System.out.printf("%s loaded",testingList.get(0).toString());
}
public void addCard(Card card) {
testingList.add(card);
}
public void printTestingList() {
for (Card card : testingList) {
System.out.println(card.toString());
}
}
}
내 Main.java :
은 여기 내 home.java (컨트롤러)입니다
package com.spdesigns.dokkancardspreview;
import com.spdesigns.dokkancardspreview.controllers.home;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
import java.io.File;
public class Main extends Application {
private home controller;
private File file = new File("CardsCollection.txt");
@Override
public void start(Stage primaryStage) throws Exception{
Parent root = FXMLLoader.load(getClass().getResource("/fxml/home.fxml"));
primaryStage.setTitle("Dokkan Battle Card Preview");
primaryStage.setScene(new Scene(root, 900, 700));
primaryStage.setResizable(false);
// Loading cards
primaryStage.show();
try {
if(!file.exists()) {
file.createNewFile();
}
controller.importFrom("CardsCollection.txt");
} catch (NullPointerException npe) {
System.out.println("Error loading file!");
npe.printStackTrace();
}
}
@Override
public void stop() {
System.out.println("App is closing!");
// Saving before exiting
try {
controller.exportTo("CardsCollection.txt");
} catch (NullPointerException npe) {
System.out.println("Problem saving file!");
npe.printStackTrace();
}
controller.printTestingList();
}
public static void main(String[] args) {
launch(args);
}
}
PS : 나는 또한 수동으로 파일에 쓰는 시도했다하지만 어느 쪽도 일하지 않았다! 여기에 코드를 입력하십시오.