帶進度條的Swing Splash屏幕

Question

這是我的啟動畫面代碼，

public class SplashScreen extends JWindow {

private static final long serialVersionUID = 1L;
private BorderLayout borderLayout = new BorderLayout();
private JLabel imageLabel = new JLabel();
private JProgressBar progressBar = new JProgressBar(0, 100);

public SplashScreen(ImageIcon imageIcon) {
    imageLabel.setIcon(imageIcon);
    setLayout(borderLayout);
    add(imageLabel, BorderLayout.CENTER);
    add(progressBar, BorderLayout.SOUTH);
    pack();
    setLocationRelativeTo(null);
}

public void showScreen() {
    SwingUtilities.invokeLater(new Runnable() {
        public void run() {
            setVisible(true);
        }
    });
}

public void close() {
    SwingUtilities.invokeLater(new Runnable() {
        public void run() {
            setVisible(false);
            dispose();
        }
    });
}

public void setProgress(final String message, final int progress) {
    SwingUtilities.invokeLater(new Runnable() {
        public void run() {
            progressBar.setValue(progress);
            if (message == null) {
                progressBar.setStringPainted(false);
            } else {
                progressBar.setStringPainted(true);
            }
            progressBar.setString("Loading " + message + "...");
        }
    });
}
}

從我這樣調用的主要方法，

public static void main(String[] args) {

    SwingUtilities.invokeLater(new Runnable() {
        public void run() {
            try {
                UIManager.setLookAndFeel(UIManager
                        .getSystemLookAndFeelClassName());

                SplashScreen splashScreen = new SplashScreen(new ImageIcon("images/splash.jpg"));
                splashScreen.showScreen();

                AppFrame frame = new AppFrame(splashScreen);

            } catch (Exception e) {
                appLogger.error(e.getMessage(), e); 
            }
        }
    });
}

在AppFrame的構造函數中我調用了splashScreen.setProgress（msg，val）方法來更新進度條。 但是沒有顯示出飛濺。 它僅在最后顯示幀時才顯示，即使負載需要很長時間。 但是，如果我把這三行

SplashScreen splashScreen = new SplashScreen(new ImageIcon("images/splash.jpg"));
splashScreen.showScreen();
AppFrame frame = new AppFrame(splashScreen);

在invokeLater（）之外，會顯示啟動畫面，並且進度條會很好地更新。 我相信GUI更新應該在invokeLater中。 可能是什么問題呢？

順便說一句，AppFrame加載我的應用程序的各種面板。

編輯：我的AppFrame的模擬如下所示。

public class AppFrame extends JFrame {

public AppFrame(SplashScreen splashScreen) {
    JPanel test = new JPanel();
    test.setLayout(new GridLayout(0, 10));

    splashScreen.setProgress("jlabel", 10);
    for(int i = 0; i < 10000; i++) {
        test.add(new JButton("Hi..." + i));
        splashScreen.setProgress("jbutton", (int)(i * 0.1));
    }
    add(new JScrollPane(test));
    setPreferredSize(new Dimension(800, 600));
    pack();
    setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    setLocationRelativeTo(null);
    splashScreen.setProgress("complete", 100);
    setVisible(true);
}
}

Answer 1

嗯，看看我把這個使用SplashScreen類放在一起的工作樣本（只使用一個簡單的Timer和ActionListener來增加ProgressBar的值，直到100並顯示一個幀）：

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Font;
import java.awt.event.ActionListener;
import javax.swing.*;

public class SplashScreen extends JWindow {

    private static JProgressBar progressBar = new JProgressBar();
    private static SplashScreen splashScreen;
    private static int count = 1, TIMER_PAUSE = 25,PROGBAR_MAX=100;
    private static Timer progressBarTimer;
    ActionListener al = new ActionListener() {

        @Override
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            progressBar.setValue(count);
            System.out.println(count);
            if (PROGBAR_MAX == count) {
                splashScreen.dispose();//dispose of splashscreen
                progressBarTimer.stop();//stop the timer
                createAndShowFrame();
            }
            count++;//increase counter

        }
    };

    public SplashScreen() {
        createSplash();
    }

    private void createSplash() {
        Container container = getContentPane();

        JPanel panel = new JPanel();
        panel.setBorder(new javax.swing.border.EtchedBorder());
        container.add(panel, BorderLayout.CENTER);

        JLabel label = new JLabel("Hello World!");
        label.setFont(new Font("Verdana", Font.BOLD, 14));
        panel.add(label);

        progressBar.setMaximum(PROGBAR_MAX);
        container.add(progressBar, BorderLayout.SOUTH);


        pack();
        setLocationRelativeTo(null);
        setVisible(true);

        startProgressBar();
    }

    private void startProgressBar() {
        progressBarTimer = new Timer(TIMER_PAUSE, al);
        progressBarTimer.start();
    }

    private void createAndShowFrame() {
        JFrame frame = new JFrame();
        frame.setSize(500, 500);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                splashScreen = new SplashScreen();
            }
        });
    }
}

Answer 2

從另一個invokeLater調用invokedLater 。 只有在完成第一個執行時才會執行runnable 。

您應該像這樣修改Splashscreen代碼：

...
private void runInEdt(final Runnable runnable) {
    if (SwingUtilities.isEventDispatchThread())
        runnable.run();
    else
        SwingUtilities.invokeLater(runnable);
}

public void showScreen() {
    runInEdt(new Runnable() {
        public void run() {
            setVisible(true);
        }
    });
}

public void close() {
    runInEdt(new Runnable() {
        public void run() {
            setVisible(false);
            dispose();
        }
    });
}

public void setProgress(final String message, final int progress) {
    runInEdt(new Runnable() {
        public void run() {
            progressBar.setValue(progress);
            if (message == null)
                progressBar.setStringPainted(false);
            else
                progressBar.setStringPainted(true);
            progressBar.setString("Loading " + message + "...");
        }
    });
}

Answer 3

    Thread l_splash_thread = new Thread(
            new SplashScreen ());
    l_splash_thread.start();

    try {
        l_splash_thread.join();
    } catch (InterruptedException e1) {
        e1.printStackTrace();
    }

我想這樣你可以保持你的潑水。