CODEWITHSUNDEEP
javaaudio
Rawand
Rawand

Reputation: 23

Playing an mp3 file in BlueJ

I'm trying to play an mp3 file in BlueJ following this Stack question answer: Playing .mp3 and .wav in Java?

I have the exact same code except the file name. Here is my code: 

String bip = "Johnny.mp3";
             Media hit = new Media(bip);
             MediaPlayer mediaPlayer = new MediaPlayer(hit);
             mediaPlayer.play();

I CAN compile this, but when the program tries to run it I get an exception. Here is the entire error: 

java.lang.IllegalArgumentException: uri.getScheme() == null! uri == 'Johnny.mp3'
at com.sun.media.jfxmedia.locator.Locator.<init>(Locator.java:211)
at javafx.scene.media.Media.<init>(Media.java:391)
at Game.goRoom(Game.java:282)
at Game.processCommand(Game.java:167)
at Game.play(Game.java:130)

Personally, I think this is related with the file path I have given. I know that the file exists in my project map but I'm very uncertain on the pathway they want, do they want a full pathway all the way from file:// or just the sound-files name which is what I have done? Note that this project doesn't have any resource folder like Eclipse projects have since this is how the IDE handles it files. The sound-file just lies in the same folder as all the classes so it's not sorted in any manner.

I have checked around, and it seems that if this is not my problem it would be that my JavaFX is not initialized. If this is the case, how would I go about it and how would the syntax look like?

Upvotes: 1

Views: 2157

Answers (2)

MadProgrammer
MadProgrammer

Reputation: 347194

Media takes your String value and tries to make a URI. Why the method doesn't just require you to pass it a URI (or URL) directly, I don't know.

The documentation outlines this rather well...

Constructs a Media instance. This is the only way to specify the media source. The source must represent a valid URI and is immutable. Only HTTP, FILE, and JAR URLs are supported. If the provided URL is invalid then an exception will be thrown. If an asynchronous error occurs, the error property will be set. Listen to this property to be notified of any such errors.
...
Constraints:

  • The supplied URI must conform to RFC-2396 as required by java.net.URI.
  • Only HTTP, FILE, and JAR URIs are supported.

See java.net.URI for more information about URI formatting in general. JAR URL syntax is specified in java.net.JarURLConnection.

Parameters:
source - The URI of the source media.
Throws:
- java.lang.NullPointerException - if the URI string is null.
- java.lang.IllegalArgumentException - if the URI string does not conform to RFC-2396 or, if appropriate, the Jar URL specification, or is in a non-compliant form which cannot be modified to a compliant form.
- java.lang.IllegalArgumentException - if the URI string has a null scheme.
- java.lang.UnsupportedOperationException - if the protocol specified for the source is not supported.
...

And if we have a look at the source, you can see it trying to wrap the String in a URI class...

public Media(@NamedArg("source") String source) {
    this.source = source;

    URI uri = null;
    try {
        // URI will throw NPE if source == null: do not catch it!
        uri = new URI(source);
    } catch(URISyntaxException use) {
        throw new IllegalArgumentException(use);
    }

So, depending on where the file is actually stored, you could use something like

Media hit = new Media(new File(bip).toURI().toURL().toString());
MediaPlayer mediaPlayer = new MediaPlayer(hit);
mediaPlayer.play();

This also assumes that "Johnny.mp3" is in the current working directory of your program.

I say "depending" as you would use a different approach for media files which were located internally (bundled) with your application to those which are external.

In which case you might use something like...

Media hit = new Media(getClass().getResource(bip).toExternalForm());
MediaPlayer mediaPlayer = new MediaPlayer(hit);
mediaPlayer.play();

Upvotes: 2

Rahul S.
Rahul S.

Reputation: 55

Here ya go:

MediaPlayer yourPlayer = new MediaPlayer(new Media(Paths.get("yourAudioFile").toUri().toString()));

Make sure to add the file extension onto the audio file! Also, import the following:

import java.nio.file.Paths;

I'm assuming you have the Media and MediaPlayer classes imported.

Upvotes: 1

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