JavaFX应用程序（使用预加载）过早退出

Question

我有一个使用Preloader进行初始化的Java应用程序。 Preloader隐藏后，主应用程序启动并成功加载资源。应用程序窗口然后暂时加载，然后退出，没有抛出异常。

主要应用代码：

/* 
* To change this license header, choose License Headers in Project Properties. 
* To change this template file, choose Tools | Templates 
* and open the template in the editor. 
*/ 
package com.adrian.mobsters.gui; 

import com.adrian.mobsters.resource.Resource; 
import com.adrian.mobsters.resource.ResourceFactory; 
import java.io.IOException; 
import java.util.logging.Level; 
import javafx.application.Application; 
import static javafx.application.Application.launch; 
import javafx.application.Platform; 
import javafx.application.Preloader.ProgressNotification; 
import javafx.application.Preloader.StateChangeNotification; 
import javafx.beans.property.BooleanProperty; 
import javafx.beans.property.SimpleBooleanProperty; 
import javafx.beans.value.ChangeListener; 
import javafx.beans.value.ObservableValue; 
import javafx.concurrent.Task; 
import javafx.fxml.FXMLLoader; 
import javafx.scene.Parent; 
import javafx.scene.Scene; 
import javafx.stage.Stage; 

/** 
* 
* @author aelder 
*/ 
public class MainGUI extends Application { 

    BooleanProperty ready = new SimpleBooleanProperty(false); 

    public void loadResources() { 
     Task task = new Task<Void>() { 

      @Override 
      protected Void call() throws Exception { 
       java.util.logging.Logger.getLogger("com.gargoylesoftware").setLevel(Level.OFF); 
       System.setProperty("org.apache.commons.logging.Log", "org.apache.commons.logging.impl.NoOpLog"); 

       double index = 0; 
       for (ResourceFactory factory : ResourceFactory.values()) { 
        index++; 
        Resource resource = factory.getResource(); 

        if (resource != null) { 
         resource.importResources(); 
         notifyPreloader(new ProgressNotification(((double) index)/ResourceFactory.values().length)); 
        } 
       } 

       ready.setValue(Boolean.TRUE); 
       notifyPreloader(new StateChangeNotification(
         StateChangeNotification.Type.BEFORE_START)); 
       return null; 
      } 
     }; 

     new Thread(task).start(); 
    } 

    @Override 
    public void start(Stage primaryStage) throws IOException { 
     loadResources(); 
     Parent root = FXMLLoader.load(MainGUI.class.getResource("main.fxml")); 
     Scene scene = new Scene(root); 

     primaryStage.setTitle("Mobsters Bot 2.0 - by Adrian Elder"); 
     primaryStage.setScene(scene); 

     // After the app is ready, show the stage 
     ready.addListener(new ChangeListener<Boolean>(){ 
      public void changed(
       ObservableValue<? extends Boolean> ov, Boolean t, Boolean t1) { 
        if (Boolean.TRUE.equals(t1)) { 
         Platform.runLater(new Runnable() { 
          public void run() { 
           primaryStage.show(); 
          } 
         }); 
        } 
       } 
     });; 
    } 

    /** 
    * @param args the command line arguments 
    */ 
    public static void main(String[] args) { 
     launch(args); 
    } 
} 

预加载代码：

/* 
* To change this license header, choose License Headers in Project Properties. 
* To change this template file, choose Tools | Templates 
* and open the template in the editor. 
*/ 
package resourceloader; 

import javafx.application.Preloader; 
import javafx.application.Preloader.ProgressNotification; 
import javafx.application.Preloader.StateChangeNotification; 
import javafx.scene.Scene; 
import javafx.scene.control.ProgressBar; 
import javafx.scene.layout.BorderPane; 
import javafx.stage.Stage; 

/** 
* Simple Preloader Using the ProgressBar Control 
* 
* @author aelder 
*/ 
public class ResourceLoader extends Preloader { 

    ProgressBar bar; 
    Stage stage; 

    private Scene createPreloaderScene() { 
     bar = new ProgressBar(); 
     BorderPane p = new BorderPane(); 
     p.setCenter(bar); 
     return new Scene(p, 300, 150);  
    } 

    @Override 
    public void start(Stage stage) throws Exception { 
     this.stage = stage; 
     stage.setScene(createPreloaderScene());  
     stage.show(); 
    } 

    @Override 
    public void handleStateChangeNotification(StateChangeNotification scn) { 
     if (scn.getType() == StateChangeNotification.Type.BEFORE_START) { 
      stage.hide(); 
     } 
    } 

    @Override 
    public void handleProgressNotification(ProgressNotification pn) { 
     bar.setProgress(pn.getProgress()); 
    } 
} 

更新： 看来它是与执行阶段show（）方法的runLater方法。出于某种原因，这会导致应用程序过早退出。

我现在的解决方案是睡觉，直到资源被加载，然后在应用程序线程上执行show方法。

public void start(Stage primaryStage) throws IOException { 
    this.primaryStage = primaryStage; 

    primaryStage.setTitle("Mobsters Bot 2.0 - by Adrian Elder"); 
    primaryStage.getIcons().add(new Image(MainGUI.class.getResourceAsStream("/icons/sword.png"))); 

    currentThread = Thread.currentThread(); 
    primaryStage.setScene(new Scene(parent.get())); 
    primaryStage.show(); 
} 

@Override 
public void init() throws InterruptedException { 
    // After the app is ready, show the stage 
    loadResources(); 

    while(!ready.get()) { 
     Thread.sleep(100); 
    } 
} 

Answer 1

移动你primaryStage.show();出了大事，把它primaryStage.setScene(scene);之后，看看是否应用正确打开。我认为这个问题是与将其标记为准备

这对我的作品的情况下尝试评论记录器和资源，然后部分取消注释。这将有助于调试。由于我没有你的图书馆，我无法做更多的工作。

public class Main extends Application { 

    BooleanProperty ready = new SimpleBooleanProperty(false); 

    public void loadResources() { 
     Task task = new Task<Void>() { 

      @Override 
      protected Void call() throws Exception { 
       //java.util.logging.Logger.getLogger("com.gargoylesoftware").setLevel(Level.OFF); 
       //System.setProperty("org.apache.commons.logging.Log", "org.apache.commons.logging.impl.NoOpLog"); 

       /*double index = 0; 
       for (ResourceFactory factory : ResourceFactory.values()) { 
        index++; 
        Resource resource = factory.getResource(); 

        if (resource != null) { 
         resource.importResources(); 
         notifyPreloader(new ProgressNotification(((double) index)/ResourceFactory.values().length)); 
        } 
       }*/ 

       ready.setValue(Boolean.TRUE); 
       notifyPreloader(new StateChangeNotification(StateChangeNotification.Type.BEFORE_START)); 
       return null; 
      } 
     }; 

     new Thread(task).start(); 
    } 

    @Override 
    public void start(Stage primaryStage) throws IOException { 

     //Parent root = FXMLLoader.load(Main.class.getResource("main.fxml")); 
     Scene scene = new Scene(new Label("Application started"), 400, 400); 

     primaryStage.setTitle("Mobsters Bot 2.0 - by Adrian Elder"); 
     primaryStage.setScene(scene); 

     // After the app is ready, show the stage 
     ready.addListener(new ChangeListener<Boolean>() { 
      public void changed(ObservableValue<? extends Boolean> ov, Boolean t, Boolean t1) { 
       if (Boolean.TRUE.equals(t1)) { 
        Platform.runLater(new Runnable() { 
         public void run() { 
          primaryStage.show(); 
         } 
        }); 
       } 
      } 
     }); 
     loadResources(); 
    } 

    /** 
    * @param args 
    *   the command line arguments 
    */ 
    public static void main(String[] args) { 
     launch(args); 
    } 
}