JavaFXPorts：未选中ListView中的选定项 [英] JavaFXPorts: Selected item in ListView is not selected

问题描述

以下是示例代码：

package com.javafxportslistviewdemo;

import com.gluonhq.charm.down.Platform;
import com.gluonhq.charm.down.Services;
import com.gluonhq.charm.down.plugins.LifecycleEvent;
import com.gluonhq.charm.down.plugins.LifecycleService;
import javafx.application.Application;
import javafx.beans.value.ObservableValue;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.geometry.Rectangle2D;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.ListView;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;
import javafx.scene.layout.VBox;
import javafx.stage.Screen;

import javafx.stage.Stage;

public class JavaFXPortsListViewDemo extends Application {

    @Override
    public void init() {
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        Screen primaryScreen = Screen.getPrimary();
        Rectangle2D visualBounds = primaryScreen.getVisualBounds();
        double width = visualBounds.getWidth();
        double height = visualBounds.getHeight();

        Label label = new Label("Here is selected item...");

        ListView<String> listView = new ListView<>();
        ObservableList<String> items = FXCollections.observableArrayList(
                "one", "two", "three", "four");
        listView.setItems(items);
        listView.getSelectionModel().selectedItemProperty().addListener((ObservableValue<? extends String> ov, String old_val, String new_val) -> {
            label.setText(new_val);
        });

        VBox root = new VBox();
        root.getChildren().addAll(label, listView);

        Scene scene = new Scene(root, width, height);

        Services.get(LifecycleService.class).ifPresent(ls -> {
            ls.addListener(LifecycleEvent.PAUSE, () -> onPause());
            ls.addListener(LifecycleEvent.RESUME, () -> onResume());
        });

        scene.addEventHandler(KeyEvent.KEY_RELEASED, e -> {
            if (KeyCode.ESCAPE.equals(e.getCode())) {
                if (Platform.isAndroid()) {
                    // bring up the menu or other Android stuff
                    Services.get(LifecycleService.class).ifPresent(LifecycleService::shutdown);
                } else {
                    // bring up the menu or other Desktop stuff
                    Services.get(LifecycleService.class).ifPresent(LifecycleService::shutdown);
                }
            }
        });

        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private void onPause() {
    }

    private void onResume() {
    }
}

开发环境：JavaFXPorts 8.60.8，javafxmobile-plugin 1.1.0，Gluon Plugin 2.4.0，NetBeans 8.1，Windows 10 Pro，64位

Environment for development: JavaFXPorts 8.60.8, javafxmobile-plugin 1.1.0, Gluon Plugin 2.4.0, NetBeans 8.1, Windows 10 Pro, 64-bit

测试环境：Android设备Samsung Galaxy A5 2016，Android 6.0.1

Environment for testing: Android device Samsung Galaxy A5 2016, Android 6.0.1

重现步骤：1。使用以下代码构建示例代码：JavaFXPorts 8.60.8，javafxmobile-plugin 1.1.0，Gluon Plugin 2.4.0; 2.在Android设备上安装并运行示例（Android 6.0.1）; 3.触摸ListView并从ListView中选择任何项目 - 未选择项目 - > BUG

Steps to reproduce: 1. Build sample code with: JavaFXPorts 8.60.8, javafxmobile-plugin 1.1.0, Gluon Plugin 2.4.0; 2. Install and Run sample on Android device (Android 6.0.1); 3. Touch on ListView and Select any item from ListView - item is not selected -> BUG

添加了JavaFXPorts问题跟踪器的错误： JavaFXPorts问题

Added bug for issue tracker of JavaFXPorts: JavaFXPorts issue

推荐答案

感谢您报告此问题。

众所周知，在某些三星设备中，触摸事件处理不会与其他Android设备一样工作。

It is already known that in some Samsung devices the touch event handling doesn't work as in the rest of Android devices.

虽然这在JavaFXPorts中得到修复，但您可以使用以下解决方法：为 ListCell 在内部连接选择。

While this is fixed in JavaFXPorts, you can use the following workaround: provide a listener to the ListCell that wires internally the selection.

根据您的样本：

    ListView<String> listView = new ListView<>();
    listView.setCellFactory(p -> new ListCell<String>() {

        private String item;
        {
            setOnMouseClicked(e -> listView.getSelectionModel().select(item));
        }

        @Override
        protected void updateItem(String item, boolean empty) {
            super.updateItem(item, empty); 
            this.item = item;
            setText(item);
        }

    });
    listView.getSelectionModel().selectedItemProperty()
      .addListener((ov, old_val, new_val) -> label.setText(new_val));

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