?? music.java
字號:
package kyodai;
import javax.sound.midi.*;
import java.io.*;
import java.net.*;
/**
* 控制背景音樂
*/
public class Music implements MetaEventListener, Runnable {
private String midiFile = "sound/bg.mid";
private Sequence sequence = null;
private Sequencer sequencer;
private boolean isPlaying = false;
private volatile Thread thread;
public Music() {
try {
loadMidi(midiFile);
}
catch (InvalidMidiDataException ex) {
}
catch (IOException ex) {
}
}
/**
* 讀取midi文件
*/
public void loadMidi(String filename)
throws IOException,InvalidMidiDataException {
URLClassLoader urlLoader = (URLClassLoader)this.getClass().getClassLoader();
URL url = urlLoader.findResource(filename);
sequence = MidiSystem.getSequence(url);
}
public void play() {
if (isPlaying) { //如果已經在播放,返回
return;
}
try {
sequencer = MidiSystem.getSequencer();
sequencer.open();
sequencer.setSequence(sequence);
sequencer.addMetaEventListener(this);
}
catch (InvalidMidiDataException ex) {
}
catch (MidiUnavailableException e) {
}
thread = new Thread(this);
thread.start();
}
public void stop() {
if (isPlaying) {
sequencer.stop();
isPlaying = false;
}
if (thread != null) {
thread = null;
}
}
public void run() {
Thread currentThread = Thread.currentThread();
while (currentThread == thread && !isPlaying) {
sequencer.start();
isPlaying = true;
try {
thread.sleep(1000l);
}
catch (InterruptedException ex) {
}
}
}
public void meta(MetaMessage event) {
if (event.getType() == 47) {
System.out.println("Sequencer is done playing.");
}
}
}
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