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Java 为什么赢了';这不就是图像吗?_Java_Swing - Fatal编程技术网

Java 为什么赢了';这不就是图像吗?

Java 为什么赢了';这不就是图像吗?,java,swing,Java,Swing,我试图做到的是,当我运行我的应用程序时,它启动线程,图像显示3秒(3000毫秒),然后线程停止运行 映像路径正确,映像文件存在,线程本身运行;然而,图像似乎没有显示出来。有什么不对劲吗?这是我的密码: package org.main; import java.awt.Graphics; import java.awt.Image; import javax.swing.ImageIcon; import javax.swing.JPanel; public class Splasher

我试图做到的是,当我运行我的应用程序时,它启动线程,图像显示3秒(3000毫秒),然后线程停止运行

映像路径正确,映像文件存在,线程本身运行;然而,图像似乎没有显示出来。有什么不对劲吗?这是我的密码:

package org.main;

import java.awt.Graphics;
import java.awt.Image;

import javax.swing.ImageIcon;
import javax.swing.JPanel;

public class Splasher extends JPanel implements Runnable {
    private static final long serialVersionUID = 1L;
    Image image;
    ImageIcon splash = new ImageIcon("res/splash.png");
    public static Thread DrawSplash = new Thread(new Splasher());

    public Splasher() {
        setFocusable(true);
        image = splash.getImage();  
        repaint();
    }
    boolean hasRan = false;
    public void run() {
        try {
            System.out.println("Drawing Splash Screen");
            repaint();
            Thread.sleep(3000);
            System.out.println("Repainted");
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    public void paint(Graphics g) {
        g.drawImage(image, 0, 0, null);
    }

    public Image getImage() {
        return image;
    }
}

你提出的问题还不够

您不会显示如何使用启动屏幕(如果它连接到任何东西),也不会显示如何启动/使用
线程

所以问题可能是任何东西

除了VishalK已经指出的所有其他内容之外,我还要添加
publicstaticthreaddrawsplash=newthread(newsplasher())
这是个坏主意。如果线程是不可重入的,则不应使用
静态
线程,也就是说,可以运行同一线程两次

这是一个演示“渐弱”启动屏幕的小示例,使用了大量Swing
计时器

这假设您使用的是Java7,要使它在Java6上工作还有很多困难,我还没有发布这些代码

public class TestSplashScreen01 {

    public static void main(String[] args) {
        new TestSplashScreen01();
    }

    public TestSplashScreen01() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                SplashScreen splash = new SplashScreen();
                splash.start();

            }
        });
    }

    public class SplashScreen extends JWindow {

        private SplashPane splash;

        public SplashScreen() {
            setBackground(new Color(0, 0, 0, 0));
            splash = new SplashPane();
            add(splash);
            pack();
            setLocationRelativeTo(null);
        }

        public void start() {
            splash.start();
        }

        public class SplashPane extends JPanel {

            private BufferedImage splash;
            private Timer timer;
            private float alpha = 0f;
            private int duration = 1000;
            private long startTime = -1;

            public SplashPane() {
                try {
                    splash = ImageIO.read(getClass().getResource("/res/SokahsScreen.png"));
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
                timer = new Timer(3000, new ActionListener() {
                    @Override
                    public void actionPerformed(ActionEvent e) {
                        fadeOut();
                    }
                });
                timer.setRepeats(false);
            }

            protected void fadeOut() {
                Timer fadeInTimer = new Timer(40, new ActionListener() {
                    @Override
                    public void actionPerformed(ActionEvent e) {
                        long now = System.currentTimeMillis();
                        long runTime = now - startTime;
                        alpha = 1f - ((float) runTime / (float) duration);
                        if (alpha <= 0.01f) {
                            alpha = 0f;
                            ((Timer) (e.getSource())).stop();
                            SwingUtilities.invokeLater(new Runnable() {
                                @Override
                                public void run() {
                                    dispose();
                                }
                            });
                        }
                        repaint();
                    }
                });
                startTime = System.currentTimeMillis();
                fadeInTimer.setRepeats(true);
                fadeInTimer.setCoalesce(true);
                fadeInTimer.start();
            }

            protected void fadeIn() {
                Timer fadeInTimer = new Timer(40, new ActionListener() {
                    @Override
                    public void actionPerformed(ActionEvent e) {
                        long now = System.currentTimeMillis();
                        long runTime = now - startTime;
                        alpha = (float) runTime / (float) duration;
                        if (alpha >= 1f) {
                            alpha = 1f;
                            ((Timer) (e.getSource())).stop();
                            timer.start();
                        }
                        repaint();
                    }
                });
                startTime = System.currentTimeMillis();
                fadeInTimer.setRepeats(true);
                fadeInTimer.setCoalesce(true);
                fadeInTimer.start();
            }

            public void start() {
                if (!SplashScreen.this.isVisible()) {
                    alpha = 0f;
                    SplashScreen.this.setVisible(true);
                    SwingUtilities.invokeLater(new Runnable() {
                        @Override
                        public void run() {
                            fadeIn();
                        }
                    });
                }
            }

            @Override
            public Dimension getPreferredSize() {
                return splash == null ? super.getPreferredSize() : new Dimension(splash.getWidth(), splash.getHeight());
            }

            @Override
            protected void paintComponent(Graphics g) {
                super.paintComponent(g);
                if (splash != null) {
                    Graphics2D g2d = (Graphics2D) g.create();
                    g2d.setComposite(AlphaComposite.SrcOver.derive(alpha));
                    int x = (getWidth() - splash.getWidth()) / 2;
                    int y = (getHeight() - splash.getHeight()) / 2;
                    g2d.drawImage(splash, x, y, this);
                    g2d.dispose();
                }
            }
        }
    }
}
公共类TestSplashScreen01{
公共静态void main(字符串[]args){
新的TestSplashScreen01();
}
公共测试屏幕01(){
invokeLater(新的Runnable(){
@凌驾
公开募捐{
试一试{
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
}catch(ClassNotFoundException |实例化Exception | IllegalacessException |不支持ookandfeelException ex){
}
SplashScreen splash=新SplashScreen();
splash.start();
}
});
}
公共类SplashScreen扩展JWindow{
私人喷溅;
公共屏幕(){
后退(新颜色(0,0,0,0));
飞溅=新的飞溅窗格();
添加(飞溅);
包装();
setLocationRelativeTo(空);
}
公开作废开始(){
splash.start();
}
公共类SplashPane扩展了JPanel{
私有缓冲区图像飞溅;
私人定时器;
专用浮点alpha=0f;
专用int持续时间=1000;
私有长startTime=-1;
公共窗格(){
试一试{
splash=ImageIO.read(getClass().getResource(“/res/sokahscreen.png”);
}捕获(IOEX异常){
例如printStackTrace();
}
计时器=新计时器(3000,新ActionListener(){
@凌驾
已执行的公共无效操作(操作事件e){
淡出();
}
});
timer.setRepeats(假);
}
受保护的无效衰减(){
Timer fadeInTimer=新计时器(40,新ActionListener(){
@凌驾
已执行的公共无效操作(操作事件e){
long now=System.currentTimeMillis();
long runTime=now-startTime;
alpha=1f-((浮动)运行时间/(浮动)持续时间);
如果(α=1f){
α=1f;
((计时器)(e.getSource()).stop();
timer.start();
}
重新油漆();
}
});
startTime=System.currentTimeMillis();
fadeInTimer.setRepeats(真);
fadeInTimer.setCoalesce(真);
fadeInTimer.start();
}
公开作废开始(){
如果(!SplashScreen.this.isVisible()){
α=0f;
SplashScreen.this.setVisible(true);
SwingUtilities.invokeLater(新的Runnable(){
@凌驾
公开募捐{
fadeIn();
}
});
}
}
@凌驾
公共维度getPreferredSize(){
return splash==null?super.getPreferredSize():新维度(splash.getWidth(),splash.getHeight());
}
@凌驾
受保护组件(图形g){
超级组件(g);
如果(飞溅!=null){
Graphics2D g2d=(Graphics2D)g.create();
g2d.setComposite(AlphaComposite.SrcOver.derive(alpha));
intx=(getWidth()-splash.getWidth())/2;
int y=(getHeight()-splash.getHeight())/2;
g2d.drawImage(splash,x,y,this);
g2d.dispose();
}
}
}
}
}
注意:

这个例子的问题是,一旦调用start,程序将继续执行,这将需要某种侦听器在启动屏幕完成时告诉相关方


或者,您可以使用未修饰的模态
JDialog

您的问题没有足够的内容

您不会显示如何使用启动屏幕(如果它连接到任何东西),也不会显示如何启动/使用
线程

所以问题可能是任何东西

除了VishalK已经指出的所有其他内容之外,我还要添加
publicstaticthreaddrawsplash=newthread(newsplasher())
这是个坏主意。如果线程是不可重入的,则不应使用
静态
线程,也就是说,可以运行同一线程两次

这是一个演示“渐弱”启动屏幕的小示例,使用了大量Swing
计时器

这个假设
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.event.ComponentEvent;
import java.awt.event.ComponentAdapter;

import javax.swing.ImageIcon;
import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.Timer;
import javax.swing.SwingUtilities;

public class Splasher extends JPanel {

    private static final long serialVersionUID = 1L;
    Image image;
    ImageIcon splash = new ImageIcon("apple.png");
    MyComponentListener componentListener ;
    Timer timer ;

    public Splasher() 
    {
        componentListener = new MyComponentListener();
        setFocusable(true);
        image = splash.getImage();  
        timer = new Timer(3000, new LoadAction());
        addComponentListener(componentListener);
     }
    boolean hasRan = false;

    @Override
    public void paintComponent(Graphics g) 
    {
        super.paintComponent(g);
        if (image == null && timer !=null )
        {
            g.clearRect(0, 0, getWidth(), getHeight()) ;
            timer.stop();
            removeComponentListener(componentListener);
        }
        else
        {
            g.drawImage(image, 0, 0, null);
        }
    }
    public Image getImage() 
    {
        return image;
    }
    private class MyComponentListener extends ComponentAdapter
    {
        @Override
        public void componentResized(ComponentEvent evt)
        {
            System.out.println("Resized..");
            timer.start();
        }
    }
    private class LoadAction implements ActionListener 
    {
        public void actionPerformed(ActionEvent evt)
        {
            System.out.println("Drawing Splash Screen");
            repaint();
            image = null;
            repaint();
            System.out.println("Repainted");
        }

    }
    public static void main(String st[])
    {
        SwingUtilities.invokeLater ( new Runnable()
        {
            @Override
            public void run()
            {
                JFrame frame = new JFrame("Splash:");
                frame.getContentPane().add(new Splasher());
                frame.setSize(300,500);
                frame.setVisible(true);
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            }
        });
    }
}