我有一个在JFrame中有多个JPanel的程序。在某些时候,只有一个面板可见[setVisible(true)],而所有其他面板不是[setVisible(false)]。我想要的是播放一段音乐,而JPanel是可见的,但是当它不是时,就会暂停。我有一个播放音频的课程
public class AudioPlay extends Thread {
private String filename;
private Position curPosition;
private final int EXTERNAL_BUFFER_SIZE = 524288; // 128Kb
enum Position {
LEFT, RIGHT, NORMAL
};
public AudioPlay(String wavfile) {
filename = wavfile;
curPosition = Position.NORMAL;
}
public AudioPlay(String wavfile, Position p) {
filename = wavfile;
curPosition = p;
}
public void run() {
while(true){
File soundFile = new File(filename);
if (!soundFile.exists()) {
System.err.println("Wave file not found: " + filename);
return;
}
AudioInputStream audioInputStream = null;
try {
audioInputStream = AudioSystem.getAudioInputStream(soundFile);
} catch (UnsupportedAudioFileException e1) {
e1.printStackTrace();
return;
} catch (IOException e1) {
e1.printStackTrace();
return;
}
AudioFormat format = audioInputStream.getFormat();
SourceDataLine auline = null;
DataLine.Info info = new DataLine.Info(SourceDataLine.class, format);
try {
auline = (SourceDataLine) AudioSystem.getLine(info);
auline.open(format);
} catch (LineUnavailableException e) {
e.printStackTrace();
return;
} catch (Exception e) {
e.printStackTrace();
return;
}
if (auline.isControlSupported(FloatControl.Type.PAN)) {
FloatControl pan = (FloatControl) auline
.getControl(FloatControl.Type.PAN);
if (curPosition == Position.RIGHT)
pan.setValue(1.0f);
else if (curPosition == Position.LEFT)
pan.setValue(-1.0f);
}
auline.start();
int nBytesRead = 0;
byte[] abData = new byte[EXTERNAL_BUFFER_SIZE];
try {
while (nBytesRead != -1) {
nBytesRead = audioInputStream.read(abData, 0, abData.length);
if (nBytesRead >= 0)
auline.write(abData, 0, nBytesRead);
}
} catch (IOException e) {
e.printStackTrace();
return;
} finally {
auline.drain();
auline.close();
}
}
}
}
因此,在每个类中扩展一个JPanel并将AudioPlay作为参数。首次创建JPanel时,调用start()方法。但后来我不断播放所有的音频文件。
任何人都可以向我展示一个JPanel,它会暂停其中一个AudioPlay类的start()方法而JPanel不可见吗?
修改 的
好吧,所以我有了一个想法并且玩了一下,现在我可以让它只在它可见的时候播放音频!在关闭其可视性之后,它会播放前一个面板音乐一两秒,但大多数情况下应该做到这一点!对于任何需要它的人来说,这是更新的。
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.DataLine;
import javax.sound.sampled.FloatControl;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.SourceDataLine;
import javax.sound.sampled.UnsupportedAudioFileException;
import javax.swing.JPanel;
public class AudioPlay extends Thread {
private String filename;
private Position curPosition;
JPanel panel;
private final int EXTERNAL_BUFFER_SIZE = 524288; // 128Kb
enum Position {
LEFT, RIGHT, NORMAL
};
public AudioPlay(String wavfile, JPanel panel) {
filename = wavfile;
curPosition = Position.NORMAL;
this.panel = panel;
}
public AudioPlay(String wavfile, Position p, JPanel panel) {
filename = wavfile;
curPosition = p;
this.panel = panel;
}
public void run() {
while(true){
File soundFile = new File(filename);
if (!soundFile.exists()) {
System.err.println("Wave file not found: " + filename);
return;
}
AudioInputStream audioInputStream = null;
try {
audioInputStream = AudioSystem.getAudioInputStream(soundFile);
} catch (UnsupportedAudioFileException e1) {
e1.printStackTrace();
return;
} catch (IOException e1) {
e1.printStackTrace();
return;
}
AudioFormat format = audioInputStream.getFormat();
SourceDataLine auline = null;
DataLine.Info info = new DataLine.Info(SourceDataLine.class, format);
try {
auline = (SourceDataLine) AudioSystem.getLine(info);
auline.open(format);
} catch (LineUnavailableException e) {
e.printStackTrace();
return;
} catch (Exception e) {
e.printStackTrace();
return;
}
if (auline.isControlSupported(FloatControl.Type.PAN)) {
FloatControl pan = (FloatControl) auline
.getControl(FloatControl.Type.PAN);
if (curPosition == Position.RIGHT)
pan.setValue(1.0f);
else if (curPosition == Position.LEFT)
pan.setValue(-1.0f);
}
auline.start();
int nBytesRead = 0;
byte[] abData = new byte[EXTERNAL_BUFFER_SIZE];
try {
while (nBytesRead != -1) {
if(this.panel.isShowing()){
nBytesRead = audioInputStream.read(abData, 0, abData.length);
if (nBytesRead >= 0)
auline.write(abData, 0, nBytesRead);
}
}
} catch (IOException e) {
e.printStackTrace();
return;
} finally {
auline.drain();
auline.close();
}
}
}
}
答案 0 :(得分:0)
你可以试试ComponentListener
虽然它从未对我有效