在 javaFX 中为 FileChooser 设置应用程序图标

Question

After I start a FileChooser window in my javaFX application in windows the application icon in the taskbar shows a java icon and not the icon of the main window. Is there a possibility to select an application icon for a FileChooser instance?

Thanks for your answeres!

Answer 1

It is possible to do so, but apparently only when you have a visible parent stage.

Provided that stage in the following example is visible, you can do this:

stage.getIcons().add(new Image("http://i.imgur.com/1M3UaZy.png"));
FileChooser fileChooser = new FileChooser();
File result = fileChooser.showSaveDialog(stage);

This opens the file chooser as a child of the given stage, which has the given icon.

I stepped through the JavaFX source code with a debugger (Oracle Java 8u72 on Windows x64), and there is not single point in the Java code where the icon could be set. The parent window handle is passed into a native method, where it then the icon probably gets resolved somewhere in the Win32 windowing code.

Answer 2

The issue with the above solution is, that it won't work out of the box when you are using FXML-controllers. That troubled me for a while, but finally I found a solution for that, which I'd like to share with you.

First you need to assign you topmost pane wihtin your fxml-file an id, for instance:

<AnchorPane prefHeight="563.0" prefWidth="442.0" scaleShape="false" xmlns="http://javafx.com/javafx/8.0.171" xmlns:fx="http://javafx.com/fxml/1" fx:id="primaryStageAnchorPane" fx:controller="application.MyController">

Now you can use this id in your controller to create the link:

@FXML
private AnchorPane primaryStageAnchorPane;

That whas the hard part. All you need to do now is to get the window-attributes of the linked pane (which are the ones from the primary stage of your application-file):

Stage stage = (Stage) primaryStageAnchorPane.getScene().getWindow();
FileChooser fileChooser = new FileChooser();
File tempFolder = fileChooser.showOpenDialog(stage);

This will overtake the main application's icon for your filechooser-window. As a side-effect your file-chooser won't appear as a seperate item in the task-bar anymore.

Worked for me, hopes it helps somebody out there :)

Answer 3

This is an ugly hack based on RAnders00 answer . It calls show before the showSaveDialog call, plus it calls stage.initStyle(StageStyle.UNDECORATED) so we don't get an unwanted window.

In addition, it only worked using resource icons, and not the url example icon.

    // For me it only worked with resource icons, nor url example icon
    stage.getIcons().add(new Image(getClass().getClassLoader().getResourceAsStream("icon.png")));
    
    FileChooser fileChooser = new FileChooser();

    // App icon show hack
    stage.initStyle(StageStyle.UNDECORATED); // Remove unwanted window (no buttons no window)
    stage.show();

    File result = fileChooser.showSaveDialog(stage);

    // Close app icon       
    stage.hide();

Only tested on windows 10.