Automatically enable button

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I'm making a demo to play WAV file and stuck with this. When I begin to play the music, I disable the btnPlay. Now I want when the music finish playing, the btnPlay must be enable automatically. But I can't do this. I can get the file duration in microsecond but I don't know what to do next. Here is the code.

Java

public void playmusic(){
        try{
            btnClose.setEnabled(true);
            btnShuffle.setEnabled(true);
            btnRepeat.setEnabled(true);
            btnPause.setEnabled(true);
            btnStop.setEnabled(true);
            if(isPausing==false){
                AudioInputStream ais = AudioSystem.getAudioInputStream(f);
                clip = AudioSystem.getClip();
                clip.open(ais);
                clip.start();
            }
            else{
                isPausing=false;
                clip.start();
            }
        }
        catch(Exception ex){}
    }

Could you give me a solution for this? Thank you very much!

Posted 25-Jun-13 6:02am

Minh Hikari

Updated 25-Jun-13 6:07am

v3

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3 solutions

Solution 1

It would appear that you need to subscribe to an event. It would seem likely that the clip object has a completed(), DonePlaying(), Finished() or some such event that would fire when the clip is completed. In this event, it would seem likely to enable your play button, but you'll also want to disable the pause and stop you started above.

Make a new method to control your buttons too - pass in bool that says if playing or not, and then toggle your buttons there, calling it in the above routine, and in the new event handler you're going to subscribe to.

Posted 25-Jun-13 6:49am

dexterama

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Minh Hikari 25-Jun-13 13:08pm

I understand what you mean. But I don't know how to make the program know when the music is finished playing.

Solution 2

Check Observer Pattern.
the button is the observer and audio steam is observable subject. you can raise an notify(), once your audio is complete.

To check the status of your audio, you will need a thread to check (ie. the sized of streamed bytes or something similar) - if the stream object is pre-implemented.

Posted 25-Jun-13 13:33pm

sorawit amorn

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Minh Hikari · Accepted Answer · 2013-06-25T14:48:00

I found the way. Just add a LineListener and everything works fine... :D

Java

public void playmusic(){
        try{
            btnClose.setEnabled(true);
            btnShuffle.setEnabled(true);
            btnRepeat.setEnabled(true);
            btnPause.setEnabled(true);
            btnStop.setEnabled(true);
            LineListener listener = new LineListener() {
                public void update(LineEvent event) {
                    if (event.getType() == LineEvent.Type.STOP) {
                        btnPlay.setEnabled(true);
                    }        
                }
            };
            
            if(isPausing==false){
                AudioInputStream ais = AudioSystem.getAudioInputStream(f);
                clip = AudioSystem.getClip();
                clip.open(ais);
                clip.start();
            }
            else{
                isPausing=false;
                clip.start();
            }
            clip.addLineListener(listener);
        }
        catch(Exception ex){}
    }