使用javax.sound.sampled.Clip播放，循环播放和停止游戏中的多种声音。意外错误 [英] Using javax.sound.sampled.Clip to play, loop, and stop multiple sounds in a game. Unexpected Errors
问题描述
我正在尝试在游戏中一次播放两种波形声音（背景音乐和效果）。我首先使用Java中的另一个音频处理程序构造了这段代码，该处理程序将处理声音的播放，停止和循环。这种结构只会播放背景音乐或效果，但一次只能播放一次。我环顾四周，并被告知使用javax.sound.sampled.Clip处理声音，因此重用了相同的构造（播放，停止，循环），但将其切换为使用javax.sound.sampled.Clip。现在我完全迷路了。到目前为止，我已经完成了所有正确的操作，并且在eclipse编辑器中没有出现任何错误，但是当我运行它时，我遇到了两个错误之一。在Eclipse中（在Linux上运行），抛出LineUnavailableException。在Eclipse中（在Windows 7上运行），我在此代码的loop（）部分中获得了java.lang.NullPointerException。如果您可以告诉我我做错了什么，或者向我指出一些相关文档，我们将不胜感激。我的代码可以处理异常，但我不确定。如果您发现其他任何令人毛骨悚然的代码失误，请让我知道我正在努力成为最好的程序员，并真的感谢建设性的批评。谢谢您的时间。
I'm trying to play two wav sounds at once during a game (Background Music and an effect). I first constructed this chunk of code using another audio handler in java which would handle the playing, stopping, and looping of the sound. This construct would play the background music or effect but only one at a time. I looked around the internet and was told to use javax.sound.sampled.Clip to handle the sounds so reused the same construct(play, stop, loop) but switched it to use javax.sound.sampled.Clip. Now I'm completely lost. From what I have read so far I've done everything correct and get no errors in the eclipse editor, but when I run it I get one of two errors. In eclipse (running on Linux) a LineUnavailableException is thrown. In eclipse (running on windows 7) I get a java.lang.NullPointerException in the loop() section of this code. If you could show me what I'm doing wrong or point me to some relevant documentation I'd appreciate it. I'm assuming its something with my code that handles Exceptions but I'm not sure. If you see any other hideous code missteps please let me know I'm striving the be the best programmer I can and really appreciate constructive criticism. Thank you for your time.
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.UnsupportedAudioFileException;
/**
* Handles play, pause, and looping of sounds for the game.
* @author Tyler Thomas
*
*/
public class Sound {
private Clip myClip;
public Sound(String fileName) {
try {
File file = new File(fileName);
if (file.exists()) {
Clip myClip = AudioSystem.getClip();
AudioInputStream ais = AudioSystem.getAudioInputStream(file.toURI().toURL());
myClip.open(ais);
}
else {
throw new RuntimeException("Sound: file not found: " + fileName);
}
}
catch (MalformedURLException e) {
throw new RuntimeException("Sound: Malformed URL: " + e);
}
catch (UnsupportedAudioFileException e) {
throw new RuntimeException("Sound: Unsupported Audio File: " + e);
}
catch (IOException e) {
throw new RuntimeException("Sound: Input/Output Error: " + e);
}
catch (LineUnavailableException e) {
throw new RuntimeException("Sound: Line Unavailable: " + e);
}
}
public void play(){
myClip.setFramePosition(0); // Must always rewind!
myClip.loop(0);
myClip.start();
}
public void loop(){
myClip.loop(Clip.LOOP_CONTINUOUSLY);
}
public void stop(){
myClip.stop();
}
}
推荐答案
I能够使代码正常工作，并且现在对Clips有更好的了解。对我帮助最大的页面是 http：//www3.ntu .edu.sg / home / ehchua / programming / java / J8c_PlayingSound.html 它将所有内容分解并帮助我看看我在哪里犯了错误。这是我的最终工作代码。像以前一样，如果您看到任何可怕的错误或在逻辑或样式上看不到，请告诉我。
I was able to get the code working and now have a better understanding of Clips. The page that helped me the most was http://www3.ntu.edu.sg/home/ehchua/programming/java/J8c_PlayingSound.html it breaks everything down and helped me see where I made mistakes. Here is my final working code. As before if you see any horrible errors or over sights in logic or style let me know.
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.UnsupportedAudioFileException;
/**
* Handles playing, stoping, and looping of sounds for the game.
* @author Tyler Thomas
*
*/
public class Sound {
private Clip clip;
public Sound(String fileName) {
// specify the sound to play
// (assuming the sound can be played by the audio system)
// from a wave File
try {
File file = new File(fileName);
if (file.exists()) {
AudioInputStream sound = AudioSystem.getAudioInputStream(file);
// load the sound into memory (a Clip)
clip = AudioSystem.getClip();
clip.open(sound);
}
else {
throw new RuntimeException("Sound: file not found: " + fileName);
}
}
catch (MalformedURLException e) {
e.printStackTrace();
throw new RuntimeException("Sound: Malformed URL: " + e);
}
catch (UnsupportedAudioFileException e) {
e.printStackTrace();
throw new RuntimeException("Sound: Unsupported Audio File: " + e);
}
catch (IOException e) {
e.printStackTrace();
throw new RuntimeException("Sound: Input/Output Error: " + e);
}
catch (LineUnavailableException e) {
e.printStackTrace();
throw new RuntimeException("Sound: Line Unavailable Exception Error: " + e);
}
// play, stop, loop the sound clip
}
public void play(){
clip.setFramePosition(0); // Must always rewind!
clip.start();
}
public void loop(){
clip.loop(Clip.LOOP_CONTINUOUSLY);
}
public void stop(){
clip.stop();
}
}
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