CODEWITHSUNDEEP
javaaudiojavafx
Dostoy320
Dostoy320

Reputation: 23

JavaFX ChangeListener duration issue

I'm very new to Java, and after poring over the docs, I'm finding myself stuck.

I have a small program that uses the JavaFX MediaPlayer to play a wav file. My player object has a currentTimeProperty, and I'd like to display the output of this property in minutes:seconds during playback.

So I have this at the end of a function that takes in my wav file and initializes the player:

mediaPlayer = new MediaPlayer(wav);
mediaPlayer.currentTimeProperty().addListener(new TimeListener());

Then I have:

public class TimeListener implements ChangeListener {
    public void changed(ObservableValue o, Object oldVal, Object newVal) {

    //Update time display with MediaPlayer's current time:
    currTimeLabel.setText(newVal.toString());
    }
}

This works. During playback of the wav, my currTimeLabel updates with the current time, in milliseconds. The thing is, I want this time in minutes:seconds.

The variable newVal is listed as type "Duration", and the Duration class has methods like toMinutes() and toSeconds(), but I can't apply them to newVal, and I don't understand why.

I can create a new Duration object:

Duration testDuration = Duration.millis(100000);

And then use the methods:

double secondsDuration = testDuration.toSeconds();
// 100.0

So if testDuration and newVal are both duration objects, why can't I apply the methods to newval?

And in general, am I on the right track? I understand there will have to be some string formatting to get my output correct, but it seems to me that first I need to get the value from newVal in a non-string format.

Thanks in advance.

Upvotes: 1

Views: 740

Answers (1)

brian
brian

Reputation: 10979

It's because your newVal is an Object and not a Duration. You could cast it and de-reference it like ((Duration)newVal). The other better way is to make your method ChangeListener<Duration> 

TimeListener = new ChangeListener<Duration>() {
      @Override public void changed(ObservableValue<? extends Duration> o, Duration oldVal, Duration newVal) {
     //now newVal is of Duration class
      }
    };

Upvotes: 1

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