简单的Java：如何在后台创建静音和取消静音按钮？

Question

我正在进行一个不断更改页面并重新绘制页面的项目，我需要静音和取消静音才能在后台播放音乐。我的问题是每当它更改页面并重新绘制以及音乐重置和停止时。我正在这样做，每当鼠标按下静音/取消静音按钮时，音乐就会播放或停止，具体取决于它是否静音。

任何人都可以使用任何简单的编码来创建静音/取消静音按钮，以便在每次页面更改时都不会中断的后台播放音乐？

我在一个 Applet 上的 eclipse 上的 java 上做这个。

请帮我把它简化一下，因为我对 java 有点陌生，所以我不太了解。谢谢。

这是页面发生变化的一些代码：

public void paint(Graphics g){   
    switch (roomPage){
    case 0: homeScreen(g); break;
    case 1: instructionsPage(g); break;
    case 2: startPage(g); break;
    }
}

这是我想要发生的一些代码：

public void mousePressed(MouseEvent me) {
    if (xPos > 0 && xPos < 0+64 && yPos >0 &&  
            yPos < 0+64){
        if(soundMuted == false){
         //since it's not muted and it is clicked then the music will change
         //to "soundMuted = true" and the music will stop
         soundMuted = true;
        }
        else {
        //since it will be changing to "soundMuted = false" the music will
        //start again
        soundMuted = false;
        }
    }
}

虽然 ^ 的问题在于，每当我使用它并转到不同的页面时，它会出于某种原因将其重置为默认状态，即 false。我只是想要一个示例来简化静音/取消静音按钮，除非单击该按钮，否则该按钮可以在后台不间断播放。

Answer 1

所以，基于这个example

我将暂停/恢复功能包装在不同的方法中。

您需要将音频文件的路径粘贴到JTextField 并按加载，然后您可以按“点我播放”标签开始播放，“点我暂停”暂停它。

（在有人因为我不使用按钮而跳来跳去之前，OP 正在使用MouseListener，所以我正在“尝试”模仿我能看到的他们的一小部分工作流程）

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.io.File;
import java.io.IOException;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.UnsupportedAudioFileException;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.CompoundBorder;
import javax.swing.border.EmptyBorder;
import javax.swing.border.LineBorder;

public class SimplyPlayer {

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

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

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane extends JPanel {

        private Clip clip;
        private JTextField audioFile;
        private int lastFrame;

        public TestPane() {
            setLayout(new BorderLayout());

            ActionListener loadAction = new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    if (clip != null) {
                        clip.stop();
                        clip.close();
                    }

                    try {
                        loadClip(new File(audioFile.getText()));
                        System.out.println("loaded");
                    } catch (LineUnavailableException | IOException | UnsupportedAudioFileException ex) {
                        ex.printStackTrace();
                    }
                }
            };

            audioFile = new JTextField(20);
            audioFile.addActionListener(loadAction);

            JButton load = new JButton("Load");
            load.addActionListener(loadAction);

            JPanel loadPanel = new JPanel(new BorderLayout());
            loadPanel.add(audioFile);
            loadPanel.add(load, BorderLayout.EAST);

            add(loadPanel, BorderLayout.NORTH);

            JPanel panel = new JPanel(new GridBagLayout());

            JLabel play = new JLabel("Click me to play");
            JLabel pause = new JLabel("Click me to pause");

            play.setBorder(new CompoundBorder(new LineBorder(Color.BLACK), new EmptyBorder(50, 50, 50, 50)));
            pause.setBorder(new CompoundBorder(new LineBorder(Color.BLACK), new EmptyBorder(50, 50, 50, 50)));

            panel.add(play);
            panel.add(pause);

            add(panel);

            MouseListener handler = new MouseAdapter() {

                @Override
                public void mouseClicked(MouseEvent e) {
                    if (e.getSource() == play) {
                        resume();
                    } else if (e.getSource() == pause) {
                        pause();
                    }
                }

            };

            play.addMouseListener(handler);
            pause.addMouseListener(handler);

        }

        protected void loadClip(File audioFile) throws LineUnavailableException, IOException, UnsupportedAudioFileException {

            AudioInputStream audioStream = AudioSystem.getAudioInputStream(audioFile);

            AudioFormat format = audioStream.getFormat();
            DataLine.Info info = new DataLine.Info(Clip.class, format);
            this.clip = (Clip) AudioSystem.getLine(info);
            this.clip.open(audioStream);

        }

        public void pause() {

            if (clip != null && clip.isRunning()) {
                lastFrame = clip.getFramePosition();
                System.out.println("Stop");
                clip.stop();
            }

        }

        public void resume() {

            if (clip != null && !clip.isRunning()) {
                // Make sure we haven't passed the end of the file...
                if (lastFrame < clip.getFrameLength()) {
                    clip.setFramePosition(lastFrame);
                } else {
                    clip.setFramePosition(0);
                }
                System.out.println("Start");
                clip.start();
            }

        }
    }

}

在小程序中加载音频文件有点复杂，但演示了here