Java如何设置虚拟键盘的布局

在Java中设置虚拟键盘的布局需要使用Java AWT和Java Swing库。以下是一个简单的示例代码，可以设置一个虚拟键盘，该键盘支持五种不同的布局：QWERTY、AZERTY、QWERTZ、Dvorak和Colemak。

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;

public class VirtualKeyboard extends JFrame implements ActionListener {
    private JTextField textField;
    private JToggleButton[] toggleButtons;

    public VirtualKeyboard() {
        super("Virtual Keyboard");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(new BorderLayout());

        // 创建一个文本框
        textField = new JTextField();
        add(textField, BorderLayout.NORTH);

        // 创建一个面板来存放切换布局的按钮
        JPanel layoutPanel = new JPanel(new GridLayout(1, 5));
        add(layoutPanel, BorderLayout.SOUTH);

        // 创建五个切换布局的按钮
        toggleButtons = new JToggleButton[5];
        toggleButtons[0] = new JToggleButton("QWERTY");
        toggleButtons[1] = new JToggleButton("AZERTY");
        toggleButtons[2] = new JToggleButton("QWERTZ");
        toggleButtons[3] = new JToggleButton("Dvorak");
        toggleButtons[4] = new JToggleButton("Colemak");

        // 默认选中第一个按钮
        toggleButtons[0].setSelected(true);

        // 添加按钮到面板
        for (JToggleButton toggleButton : toggleButtons) {
            layoutPanel.add(toggleButton);
            toggleButton.addActionListener(this);
        }

        // 添加虚拟键盘到窗口中
        add(createVirtualKeyboard(), BorderLayout.CENTER);

        // 设置窗口大小和可见性
        setSize(500, 300);
        setVisible(true);
    }

    // 创建一个虚拟键盘
    private JPanel createVirtualKeyboard() {
        JPanel keyboardPanel = new JPanel(new GridLayout(4, 13));
        String[] keyLayouts = {
                "1234567890-=",
                "qwertyuiop[]\\",
                "asdfghjkl;'",
                "zxcvbnm,./"
        };
        String[] keyLayoutsAzerty = {
                "1234567890-=",
                "azertyuiop^$",
                "qsdfghjklmù",
                "<wxcvbn,;:!?",
        };
        String[] keyLayoutsQwertz = {
                "1234567890-=",
                "qwertzuiop[]",
                "asdfghjklä'",
                "yxcvbnm,.-"
        };
        String[] keyLayoutsDvorak = {
                "1234567890[]",
                "',.pyfgcrl/=",
                "aoeuidhtns-",
                ";qjkxbmwvz"
        };
        String[] keyLayoutsColemak = {
                "1234567890[]",
                "qwfpgjluy;\\",
                "arstdhneio'",
                "zxcvbkm,./"
        };
        String[] currentKeyLayout = keyLayouts;

        // 添加键盘按键
        for (String row : currentKeyLayout) {
            for (int i = 0; i < row.length(); i++) {
                String key = row.substring(i, i + 1);
                JButton button = new JButton(key);
                button.addActionListener(this);
                keyboardPanel.add(button);
            }
        }

        return keyboardPanel;
    }

    // 处理按钮点击事件
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() instanceof JToggleButton) {
            // 切换键盘布局
            JToggleButton toggleButton = (JToggleButton) e.getSource();
            if (toggleButton.isSelected()) {
                for (int i = 0; i < toggleButtons.length; i++) {
                    if (toggleButtons[i] != toggleButton) {
                        toggleButtons[i].setSelected(false);
                    }
                }
                switch (toggleButton.getText()) {
                    case "QWERTY":
                        currentKeyLayout = keyLayouts;
                        break;
                    case "AZERTY":
                        currentKeyLayout = keyLayoutsAzerty;
                        break;
                    case "QWERTZ":
                        currentKeyLayout = keyLayoutsQwertz;
                        break;
                    case "Dvorak":
                        currentKeyLayout = keyLayoutsDvorak;
                        break;
                    case "Colemak":
                        currentKeyLayout = keyLayoutsColemak;
                        break;
                }
                updateVirtualKeyboard();
            }
        } else if (e.getSource() instanceof JButton) {
            // 添加键盘输入到文本框
            JButton button = (JButton) e.getSource();
            String key = button.getText();
            textField.setText(textField.getText() + key);
        }
    }

    // 更新虚拟键盘布局
    private void updateVirtualKeyboard() {
        JPanel keyboardPanel = (JPanel) getContentPane().getComponent(1);
        keyboardPanel.removeAll();

        for (String row : currentKeyLayout) {
            for (int i = 0; i < row.length(); i++) {
                String key = row.substring(i, i + 1);
                JButton button = new JButton(key);
                button.addActionListener(this);
                keyboardPanel.add(button);
            }
        }

        keyboardPanel.revalidate();
        keyboardPanel.repaint();
    }

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

这个程序创建了一个带有文本框和虚拟键盘的窗口，可以通过切换布局按钮来切换虚拟键盘的布局。当用户点击键盘上的按钮时，相应的字符将添加到文本框中。