[英]How to loop a sound while button is pressed and stop when released?
我试图搜索与此类似的问题,但找不到。 我不知道在释放按钮时如何停止声音,而且我也不知道如何仅一个一个地循环播放声音,当我按住按钮时,它会在上一个循环仍在播放的同时再次播放声音从∞声音变成一个循环。
这是代码:
import java.applet.Applet;
import java.applet.AudioClip;
import java.awt.Component;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.io.File;
import java.net.MalformedURLException;
import java.util.ArrayList;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.ActionMap;
import javax.swing.InputMap;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.KeyStroke;
import javax.swing.SwingUtilities;
public class test {
String b[]={"Q","W","E","R","T","Y","U","I","O","P","A","S","D","F","G","H","J","K","L","Z","X","C","V","B","N","M"};
Action[] actions = new AbstractAction[26];
public test() throws Exception {
JFrame frame = new JFrame();
JButton[] buttons = new JButton[26];
for(int i = 0; i < buttons.length; i++) {
buttons[i] = new JButton(b[i]);
buttons[i].setSize(80, 80);
buttons[i].addKeyListener(new KeyAdapter(){
public void keyPressed(KeyEvent e){
System.out.println(e.getKeyChar());
playSound(new File("loopbase/loop1/"+e.getKeyChar()+".wav"));
}
public void keyReleased(KeyEvent e){
}
});
frame.add(buttons[i]);
}
JPanel contentPane = (JPanel)frame.getContentPane();
frame.setLayout(new GridLayout(3, 5, 5, 3));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable(){
public void run() {
try {
new test();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
}
public void playSound(File soundName)
{
try
{
AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(soundName.getAbsoluteFile( ));
Clip clip = AudioSystem.getClip( );
clip.open(audioInputStream);
clip.start( );
}
catch(Exception ex)
{
System.out.println("Error with playing sound.");
ex.printStackTrace( );
}
}
}
有人可以帮我解决这个问题吗?
释放按钮时我不知道如何停止声音?
您可以使用DataLine#stop()停止剪辑。 只需保留最后播放的剪辑的参考,然后在下面的行中调用即可停止它。
clip.stop();
注意:您可以将其存储在static
变量中的某个位置。
样例代码:
private static Clip clip;
...
public void keyReleased(KeyEvent e) {
if (clip != null) {
clip.stop();
}
}
...
public void playSound(File soundName) {
...
clip = AudioSystem.getClip();
...
}
当我按住Button时,它将再次播放,而上一个循环仍在播放。
这是因为对于每个keyPress
您都将创建一个新的File
对象。 那应该避免。
停止声音:我会在playsound
方法中添加一个boolean
参数。 根据所传递的参数,我将调用clip.start()
或clip.stop()
(超类DataLine具有stop方法)。 调用playsound(filename,false);
在keyReleased
。
public void playSound(File soundName , boolean start)
{
try
{
AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(soundName.getAbsoluteFile( ));
Clip clip = AudioSystem.getClip( );
clip.open(audioInputStream);
if(start == true)
clip.start();
else
clip.stop();
}
catch(Exception ex)
{
System.out.println("Error with playing sound.");
ex.printStackTrace( );
}
}
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