How to open Photos by the FileChooser with a certain extension with JavaFX?

Question

I'm making photo manager and I'm searching to know how to get files from the FileChooser with some extension:*.png - *.jpg ... So which method should I use or which code should I do ?

I tried this: fileChooser.getExtensionFilters(); but it does not anything.

Can any body help me?

Answer 1

The FileChooser class has a nested class ExtensionFilter. First you have to create an Instance of it:

FileChooser.ExtensionFilter imageFilter
    = new FileChooser.ExtensionFilter("Image Files", "*.jpg", "*.png");

afterwards you can add this Instance to your FileChooser's Extension list:

FileChooser fc = new FileChooser();
fc.getExtensionFilters().add(imageFilter);

A Minimal Complete Verifiable Example code is down below:

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.FileChooser;
import javafx.stage.Stage;

public class FileChooserTest extends Application {

  @Override
  public void start(Stage primaryStage) {
    FileChooser.ExtensionFilter imageFilter
        = new FileChooser.ExtensionFilter("Image Files", "*.jpg", "*.png");

    FileChooser fc = new FileChooser();
    fc.getExtensionFilters().add(imageFilter);

    Button btn = new Button();
    btn.setText("Open File");
    btn.setOnAction((ActionEvent event) -> {
      fc.showOpenDialog(primaryStage);
    });

    StackPane root = new StackPane();
    root.getChildren().add(btn);

    Scene scene = new Scene(root, 300, 250);

    primaryStage.setTitle("FileChooser Demo");
    primaryStage.setScene(scene);
    primaryStage.show();
  }

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