How do I make JavaFX MediaView stretch media to fi

问题:

I'm trying to make my video's dimensions stretch automatically and fill the MediaView and maintain the original aspect ratio of the video. Basically, I want my MediaPlayer to fit the parent container on resize etc. like pretty much all video players do.

If anyone could shed some light on how to achieve this that would be much appreciated, thanks.

回答1:

Here's an example of stretching to the containing Scene and the scene is set by the Dimension "size":

final MediaPlayer videoPlayer = new MediaPlayer(
    new Media(new File(videoPath).toURI().toString()));
MediaView mv = new MediaView(videoPlayer);
DoubleProperty mvw = mv.fitWidthProperty();
DoubleProperty mvh = mv.fitHeightProperty();
mvw.bind(Bindings.selectDouble(mv.sceneProperty(), "width"));
mvh.bind(Bindings.selectDouble(mv.sceneProperty(), "height"));
mv.setPreserveRatio(true);

setScene(new Scene(new Group(mv), size.getWidth(), size.getHeight()));

回答2:

A more declarative way in a ".fxml" file would be:

...
<Pane fx:id="mediaViewPane">
  <children>
     <MediaView fx:id="videoView" fitHeight="${mediaViewPane.height}" fitWidth="${mediaViewPane.width}" layoutX="1.0" />
  </children>
</Pane>
...

You can use the "${...}" syntax for any attribute in your ".fxml" for Expression Binding. If you want to call a UI element you have to provide a "fx:id". For example in this case it's fx:id="mediaViewPane".

So you don't have to care about the UI stuff in your code. For me it's a little bit cleaner.

回答3:

Just realized no-one answered this so I'll answer it.

Just set the media player fitWidthProperty to that of the MediaView so:

player.fitWidthProperty().bind(mediaView.widthProperty());

and the same for the height (if you wanted) and also preserveRatio and stuff.

回答4:

I also struggled with this but I did this

mediaView.fitWidthProperty().bind(stage.widthProperty());
mediaView.fitHeightproperty().bind(stage.heightProperty());

and I worked for me. The mediaView played at the same size as the stage / window. Hope it helps.