JavaFx : How to put ImageView inside ListView

问题

I've been searching some threads about JavaFx ListView still it's hard to look for a simple yet easy solution for putting a JavaFx ImageView inside JavaFx ListView. I am trying to create a chat application using JavaFx framework. at the photo it should look like that.This is not duplicate because the other thread is vague for a beginner like me. ListView with imageview inside

I tried something like this. I'm totally noob to this thanks in advance!

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.control.ListCell;
import javafx.scene.control.ListView;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.Priority;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class Main extends Application {
     ImageView imageView = new ImageView();
     Image image = new Image(Main.class.getResourceAsStream("bell.jpg"));
    ListView<String> list = new ListView<String>();
    ObservableList<String> data = FXCollections.observableArrayList(
            "chocolate", "salmon", "gold", "coral", "darkorchid",
            "darkgoldenrod", "lightsalmon", "black", "rosybrown", "blue",
            "blueviolet", "brown");
   Image pic;

    @Override
    public void start(Stage stage) {
        VBox box = new VBox();
        Scene scene = new Scene(box, 200, 200);
        stage.setScene(scene);
        stage.setTitle("ListViewSample");
        box.getChildren().addAll(list);
        VBox.setVgrow(list, Priority.ALWAYS);
        list.setItems(data);

        list.setCellFactory(listView -> new ListCell<String>() {
            public void updateItem(String friend, boolean empty) {
                super.updateItem(friend, empty);
                if (empty) {
                    setText(null);
                    setGraphic(null);
                } else {

                    imageView.setImage(image);
                    setText(friend);
                    setGraphic(imageView);
                }
            }

        });

        stage.show();
    }


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

回答1:

You do not need to create a new HBox every time you want to set an image inside a ListView. You can directly use the setCellFactory() of the ListView to achieve the same result.

This example is just an extension of the answer Image in JavaFX ListView and contains a Minimal, Complete, and Verifiable example which can be tried and tested. If you want to understand how this works, I suggest you to go through the linked question first.

Update - How to resize Images

To resize images to fit the size you want, make use of fitWidth() and fitHeight() methods of the ImageView. There are other methods like setSmooth() and setPreserveRatio() which can come in handy as well.

MCVE

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.ListCell;
import javafx.scene.control.ListView;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class ListViewWithImages extends Application {

    private final Image IMAGE_RUBY  = new Image("https://upload.wikimedia.org/wikipedia/commons/f/f1/Ruby_logo_64x64.png");
    private final Image IMAGE_APPLE  = new Image("http://findicons.com/files/icons/832/social_and_web/64/apple.png");
    private final Image IMAGE_VISTA  = new Image("http://antaki.ca/bloom/img/windows_64x64.png");
    private final Image IMAGE_TWITTER = new Image("http://files.softicons.com/download/social-media-icons/fresh-social-media-icons-by-creative-nerds/png/64x64/twitter-bird.png");

    private Image[] listOfImages = {IMAGE_RUBY, IMAGE_APPLE, IMAGE_VISTA, IMAGE_TWITTER};

    @Override
    public void start(Stage primaryStage) throws Exception {

        ListView<String> listView = new ListView<String>();
        ObservableList<String> items =FXCollections.observableArrayList (
                "RUBY", "APPLE", "VISTA", "TWITTER");
        listView.setItems(items);

        listView.setCellFactory(param -> new ListCell<String>() {
            private ImageView imageView = new ImageView();
            @Override
            public void updateItem(String name, boolean empty) {
                super.updateItem(name, empty);
                if (empty) {
                    setText(null);
                    setGraphic(null);
                } else {
                    if(name.equals("RUBY"))
                        imageView.setImage(listOfImages[0]);
                    else if(name.equals("APPLE"))
                        imageView.setImage(listOfImages[1]);
                    else if(name.equals("VISTA"))
                        imageView.setImage(listOfImages[2]);
                    else if(name.equals("TWITTER"))
                        imageView.setImage(listOfImages[3]);
                    setText(name);
                    setGraphic(imageView);
                }
            }
        });
        VBox box = new VBox(listView);
        box.setAlignment(Pos.CENTER);
        Scene scene = new Scene(box, 200, 200);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

OUTPUT

回答2:

In addition to my comment I will show here some code, that is working for me:

private void setListEntry(ListCell<Label> listCell, Label label) {

        Image img = loadLableIcon(label);

        GridPane row = new GridPane();
        row.setHgap(15);
        row.setVgap(15);

        ColumnConstraints col1 = new ColumnConstraints();
        col1.setPercentWidth(90);
        ColumnConstraints col2 = new ColumnConstraints();
        col2.setPercentWidth(10);

        ImageView icon = new ImageView(img);

        javafx.scene.control.Label name = new javafx.scene.control.Label(label.getName());
        name.setMinWidth(120d);

        javafx.scene.control.Label amount = new javafx.scene.control.Label("" + label.getSize());

        HBox iconAndName = new HBox(10);
        iconAndName.setAlignment(Pos.CENTER_LEFT);
        iconAndName.getChildren().addAll(icon, name);

        row.add(iconAndName, 0, 0);
        row.add(amount, 1, 0);

        row.getColumnConstraints().addAll(col1, col2);

        listCell.setGraphic(row);
    }

Please note: I'm not an expert in JavaFX, so I am not sure if it's best practise or not.

来源：https://stackoverflow.com/questions/33592308/javafx-how-to-put-imageview-inside-listview