How do I change the icon of an Alert dialog?

Question

I want to change following default icon of a alert message. How can I do it?

This is what I want to change:

I want to change the Icon. It means I want to change that blue icon to something else. Not to change alret type

Answer 1

You have a couple of options.

First of all, the Alert class accepts an AlertType parameter when creating the alert. There are 5 built-in options to choose from, each with it's own icon:

INFORMATION, CONFIRMATION, WARNING, ERROR, and NONE (which provides no icon at all).

You can select one of these icons when creating the Alert by passing the AlertType to the constructor:

Alert alert = new Alert(AlertType.ERROR);

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If, however, you want to provide your own icon image, you can do so by accessing the dialogPane of the Alert and setting the graphic property:

alert.getDialogPane().setGraphic(new ImageView("your_icon.png"));

Below is a simple application that demonstrates how to use a custom icon image for the Alert:

import javafx.application.Application;
import javafx.scene.control.Alert;
import javafx.scene.image.ImageView;
import javafx.stage.Stage;

public class Main extends Application {

    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) {

        // Build the Alert
        Alert alert = new Alert(Alert.AlertType.ERROR);
        alert.setTitle("Alert Test");
        alert.setHeaderText("This uses a custom icon!");

        // Create the ImageView we want to use for the icon
        ImageView icon = new ImageView("your_icon.png");

        // The standard Alert icon size is 48x48, so let's resize our icon to match
        icon.setFitHeight(48);
        icon.setFitWidth(48);

        // Set our new ImageView as the alert's icon
        alert.getDialogPane().setGraphic(icon);
        alert.show();
    }
}

And the resulting Alert:

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Note: As Sai Dandem's equally-valid answer illustrates, you are not restricted to using an ImageView for the graphic. The setGraphic() method accepts any Node object, so you could just as easily pass a Button, Hyperlink, or other UI component.

Answer 2

Apart from what @Zephyr has already mentioned, if you want to set your own custom icon/graphic at the place where you pointed in your screenshot, use setGraphic() method of javafx.scene.control.Dialog class.

In the below code, though the alertType is INFORMATION, it will override the predefined icon with the provided graphic node.

Alert alert = new Alert(Alert.AlertType.INFORMATION);
alert.setTitle("My Title");
alert.setContentText("My Content text");
alert.setHeaderText("My Header");
alert.setGraphic(new Button("My Graphic"));
alert.show();