JavaFx：如何将ImageView放在ListView中 [英] JavaFx : How to put ImageView inside ListView

问题描述

我一直在寻找关于JavaFx ListView的一些线程，但仍然很难找到一个简单而简单的解决方案，可以将JavaFx ImageView放在JavaFx ListView中。我正在尝试使用JavaFx框架创建聊天应用程序。它应该看起来像那样。这不是重复的，因为另一个线程对于像我这样的初学者来说是模糊的。

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);
    }
}`

解决方案

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

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