Question

我有一个带有ActionListener的JRadioButton但无法弄清楚如何在单击时触发另一个面板中JButton的图标更改。两者的代码如下所示。选择正确的单选按钮后，图像需要从左侧按钮切换到右侧。

package gui;

public class ExampleGUI extends JFrame {

private static final long serialVersionUID = 1L;
private JPanel contentPane;
ImageIcon icon = new ImageIcon(ExampleGUI.class
        .getResource("/gui/schlange1.gif"));

/**
 * Launch the application.
 */
public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                ExampleGUI frame = new ExampleGUI();
                frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}

/**
 * Create the frame.
 */
public ExampleGUI() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds(100, 100, 450, 300);
    contentPane = new JPanel();
    contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
    contentPane.setLayout(new BorderLayout(0, 5));
    setContentPane(contentPane);

    JLabel lblExampleGui = new JLabel("Example GUI");
    lblExampleGui.setFont(new Font("Tahoma", Font.PLAIN, 18));
    lblExampleGui.setHorizontalAlignment(SwingConstants.CENTER);
    contentPane.add(lblExampleGui, BorderLayout.NORTH);

    JPanel radioButtonPanel = new JPanel();
    contentPane.add(radioButtonPanel, BorderLayout.SOUTH);

    JPanel imagePanelBoxes = mainImagePanel();
    contentPane.add(imagePanelBoxes, BorderLayout.CENTER);

    JButton leftImage = leftClickImage();
    imagePanelBoxes.add(leftImage);

    JButton rightImage = rightClickImage();
    imagePanelBoxes.add(rightImage);

    JRadioButton leftRadioButton = leftRadioButton();
    radioButtonPanel.add(leftRadioButton);

    JRadioButton rightRadioButton = rightRadioButton();
    radioButtonPanel.add(rightRadioButton);

    ButtonGroup group = new ButtonGroup();
    group.add(leftRadioButton);
    group.add(rightRadioButton);
}

private JPanel mainImagePanel() {
    JPanel imagesPanel = new JPanel();
    imagesPanel.setBorder(new EmptyBorder(0, 5, 0, 5));
    imagesPanel.setLayout(new GridLayout(0, 2, 10, 0));
    return imagesPanel;
}

private JRadioButton leftRadioButton() {
    final JRadioButton leftRadioButton = new JRadioButton("LEFT");
    leftRadioButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            changeIcon(leftClickImage(), icon);
        }
    });
    leftRadioButton.setSelected(true);
    return leftRadioButton;
}

private JRadioButton rightRadioButton() {
    final JRadioButton rightRadioButton = new JRadioButton("RIGHT");
    rightRadioButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            changeIcon(rightClickImage(), icon);
        }
    });
    rightRadioButton.isSelected();
    return rightRadioButton;
}

private JButton leftClickImage() {
    JButton leftImage = new JButton("");
    leftImage.setIcon(new ImageIcon(ExampleGUI.class
            .getResource("/gui/schlange1.gif")));
    leftImage.setBackground(Color.BLACK);
    return leftImage;
}

private JButton rightClickImage() {
    final JButton rightImage = new JButton("");
    rightImage.setBackground(Color.BLACK);
    return rightImage;
}

public void changeIcon(JButton jb, ImageIcon icon) {
    jb.setIcon(icon);
}

}

Answer 1

public class SwitchButton {
public static void main(String [] args){
    SwitchButton sb = new SwitchButton();
}

JFrame jfButtons =  new JFrame();
JPanel jpButtons =  new JPanel();
JRadioButton jrb = new JRadioButton("if you click me");
JButton jb = new JButton("I'll change");

public SwitchButton(){
    jrb.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            changeColor(jb, Color.blue);
        }
    });
    jpButtons.add(jrb);
    jpButtons.add(jb);
    jfButtons.add(jpButtons);
    jfButtons.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    jfButtons.setVisible(true);
    jfButtons.pack();
}

public void changeColor(JButton jbtn, Color color){
    jbtn.setBackground(color);
}

}

这基本上是你要做的。您只需将changeColor（）更改为changeIcon（）

即可

Answer 2

只是简单地

yourJButton.setIcon(yourIconToSet);

这应该是从单选按钮

上的动作侦听器调用的

leftRadioButton.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent arg0) {
        // ? <- here invoke code to change your button's label
    }
});

Answer 3

你可以提供Button，将其作为你的JRadioButton创建者的参数进行更改，但看起来非常难以理解且设计不合理

private JRadioButton leftRadioButton(JButton affectedButton) {
    JRadioButton leftRadioButton = new JRadioButton("LEFT");
    leftRadioButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {
            if (leftRadioButton.isSelected())
                affectedButton=rightRadioButton();
            else 
                affectedButton=leftRadioButton();
        }
    });
    leftRadioButton.setSelected(true);
    return leftRadioButton;
}

我宁愿不使用actionListener的内联定义，而是在你的框架（或你使用的whatelse类）中实现它，以访问该类中使用的按钮和标签等。如果你没有太多的东西可以听，它会变得更具可读性。

public class buttonchanger extends JFrame implements ActionListener{
    JPanel radioButtonPanel;
    JPanel imagePanelBoxes;
    JButton leftImage;
    JButton rightImage;
    JRadioButton leftRadioButton;
    JRadioButton rightRadioButton;

    public initGUI() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 450, 300);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        contentPane.setLayout(new BorderLayout(0, 5));
        setContentPane(contentPane);

        JLabel lblExampleGui = new JLabel("Example GUI");
        lblExampleGui.setFont(new Font("Tahoma", Font.PLAIN, 18));
        lblExampleGui.setHorizontalAlignment(SwingConstants.CENTER);
        contentPane.add(lblExampleGui, BorderLayout.NORTH);

        JPanel radioButtonPanel = new JPanel();
        contentPane.add(radioButtonPanel, BorderLayout.SOUTH);

        JPanel imagePanelBoxes = mainImagePanel();
        contentPane.add(imagePanelBoxes, BorderLayout.CENTER);

        JButton leftImage = leftClickImage();
        imagePanelBoxes.add(leftImage);

        JButton rightImage = rightClickImage();
        imagePanelBoxes.add(rightImage);

        JRadioButton leftRadioButton = leftRadioButton();
        leftRadioButton.addActionListener(this);
        radioButtonPanel.add(leftRadioButton);

        JRadioButton rightRadioButton = rightRadioButton();
        rightRadioButton.addActionListener(this);
        radioButtonPanel.add(rightRadioButton);

        ButtonGroup group = new ButtonGroup();
        group.add(leftRadioButton);
        group.add(rightRadioButton);
    }

    public void ActionListener(ActionEvent actE){
        Object obj=actE.getSource();
        if (obj==leftRadioButton){
            leftImage.setIcon(yourIcon);
            //or do whatever you intend to do
        }
    }

}

希望这更像是您正在寻找的解决方案。我仍然不知道什么按钮应该改变到radioButton-Event

之后的状态

Answer 4

ImageIcon icon = new ImageIcon("img src"); 

rightRadiobutton.addActionListener(new ActionListener(ActionEvent ae){
   changeIcon(rightButton, icon); 
});

public void changeIcon(JButon jb, ImageIcon icon){
    jb.setIcon(icon);
}

你对leftRadioButton做同样的事情。您也不需要单独的方法来创建组件;您可以像以下一样分配和使用它们：

JRadioButton rightJrb = new JRadioButton("I am a radio button");
rightJrb.addActionListener();

根据JRadioButton选择更改JButton的图标

4 个答案: