6
我有一個使用Preloader進行初始化的Java應用程序。 Preloader隱藏後,主應用程序啓動併成功加載資源。應用程序窗口然後暫時加載,然後退出,沒有拋出異常。JavaFX應用程序(使用預加載)過早退出
主要應用代碼:
/*
* 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);
}
}
預加載代碼:
/*
* 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: 看來它是與執行階段show()方法的runLater方法。出於某種原因,這會導致應用程序過早退出。
我現在的解決方案是睡覺,直到資源被加載,然後在應用程序線程上執行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);
}
}
解決了這個問題,但不會允許應用程序在資源完成加載之前啓動?我按照oracle的教程(圖13-12)(http://docs.oracle.com/javase/8/docs/technotes/guides/deploy/preloaders.html#BABGGDJG)來使用這個事件模式。 –
我覺得問題出在你保護的Void調用()拋出異常 函數。你調試了嗎?我想在該函數中添加一個try catch,並且你應該得到一個錯誤。我無法調試您的代碼,因爲引用了一些我沒有的庫 –
即使刪除我的所有本地代碼,錯誤仍然會發生。刪除除了將進度欄通知更新爲1.0之外的所有代碼。 –