无法在退出屏幕上投影图像

Question

问题是：当我关闭主程序时，我有一个带有一些图像的小窗口（退出屏幕），这个图像不可见，只有框架。当我启动程序时，我还有另一个图像，这个图像在屏幕上可见，但第二个（关闭时）不可见。当我在 Eclipse 中编译这个类时，一切正常，但是当我运行 MAIN 程序时它没有。两者都是从同一个类生成的，但区别在于构造函数的参数。这两个 PNG 文件都在此项目的 JAR 文件和 WorkSpace 所在的文件夹中。请帮忙。

闪屏代码：

package Models;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Toolkit;

import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JWindow;

import MainProject.ExpertSystem;




public class SplashScreen extends JWindow {

    private static final long serialVersionUID = 1L;
    private int duration;
    private ExpertSystem context;
    private String graphicPath;
    private boolean exit = false;
    int width,height;
    private boolean showContext;

    public SplashScreen(int d, ExpertSystem context,String graphicPath,boolean exit,int width, int height,boolean showContext) {
    duration = d;
    this.graphicPath = graphicPath;
    this.context = context;
    this.exit = exit;
    this.width = width;
    this.height = height;
    this.showContext = showContext;
    showSplashAndExit();
  }
    public SplashScreen(int d)
    {
        duration = d;
    }

  // A simple little method to show a title screen in the center
  // of the screen for the amount of time given in the constructor
  public void showSplash() {

    JPanel content = (JPanel)getContentPane();
    content.setBackground(Color.white);

    // Set the window's bounds, centering the window

    Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();
    int x = (screen.width-width)/2;
    int y = (screen.height-height)/2;
    setBounds(x,y,width,height);

    // Build the splash screen
    JLabel label = new JLabel(new ImageIcon(graphicPath));
    JLabel copyrt = new JLabel("Copyright 2013, Dariusz Kruk", JLabel.CENTER);
    copyrt.setFont(new Font("Sans-Serif", Font.BOLD, 12));
    content.add(label, BorderLayout.CENTER);
    content.add(copyrt, BorderLayout.SOUTH);
    //Color oraRed = new Color(156, 20, 20,  255);
   // content.setBorder(BorderFactory.createLineBorder(oraRed, 0));

    // Display it
    setVisible(true);

    // Wait a little while, maybe while loading resources
    try 
    { 
        Thread.sleep(duration); 
    } catch (Exception e) {}

    setVisible(false);
  }

  public void showSplashAndExit() {

      showSplash();
      if(showContext == true)
      {
          context.setVisible(true);
      }
      dispose();
      //System.exit(0);

    if(exit == true)
    {
        System.exit(0);
    }
  }

  public static void main(String[] args) {
    // Throw a nice little title page up on the screen first
   SplashScreen splash = new SplashScreen(5000);
    // Normally, we'd call splash.showSplash() and get on with the program.
    // But, since this is only a test...
    splash.showSplashAndExit();
  }
}

启动欢迎屏幕：

public ExpertSystem()
    {

        introduction = new SplashScreen(5000,this,"Multimedia/AIWelcome.png",false,478,150,true);
          ..........
          ..........
         }

启动退出屏幕：

else if(input == mWyjscie)
        {

            int odpo=JOptionPane.showConfirmDialog(this, "Czy na pewno wyjsc?","Pytanie",JOptionPane.YES_NO_OPTION);

            if(odpo==JOptionPane.YES_OPTION)
            {
                this.setVisible(false);
                exit = new SplashScreen(5000,this,"Multimedia/e.jpg",true,613,173,false);

            }
            else if(odpo==JOptionPane.NO_OPTION)
            {           
            }
        }

Answer 1

您调用 Thread.sleep() 可能有问题，它会阻止 EDT。也许您应该使用 Swing Timer，如果您需要执行后台任务，甚至可以使用 SwingWorker。如果没有后台任务，我会使用 javax.swing.Timer 这样的东西：

Timer timer = new Timer(duration, new ActionListener(){
    public void actionPerformed(ActionEvent e){
        setVisible(false);
    }
});
timer.setRepeats(false);
timer.start();

而不是

try 
{ 
    Thread.sleep(duration); 
} catch (Exception e) {}

setVisible(false);

请注意我是如何在计时器内调用showSlashAndExit，而不是在main 中。或者，也许你不想那样。我不太确定您的程序流程。

编辑测试这个程序。它运行良好。显示5秒后退出

import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JWindow;
import javax.swing.SwingUtilities;
import javax.swing.Timer;

public class Splash extends JWindow{
    int duration;

    public Splash(int duration) {
        this.duration = duration;

        showSplash();
    }

    public void showSplash() {

        setSize(300, 300);
        setLocationRelativeTo(null);
        setVisible(true);

        Timer timer = new Timer(duration, new ActionListener(){
            public void actionPerformed(ActionEvent e) {
                setVisible(false);
                System.exit(0);
            }
        });
        timer.start();

    }


    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable(){
            public void run() {
                Splash splash = new Splash(5000);
            }   
        });
    }
}