Question

您好我一直在关注如何将背景图像添加到JFrame的多个指南。然而，在运行我的程序时，背景结果只显示左下方和底部的一些背景图像。

这是我目前的代码：

private int width = 1280;
private int height = 720;

private String title = "Creation - " + Component.versionID + " Launcher";

private JPanel window = new JPanel();
private JFrame frame = new JFrame();
private JLabel name, version;


private JButton play, options, changelog, quit;
private Rectangle rPlay, rOptions, rChangelog, rQuit, rName, rVersion;
private int buttonWidth = 200;
private int buttonHeight = 80;

public Menu (Component component) {
    frame.setTitle(title);
    frame.setSize(new Dimension(width, height));
    frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
    frame.add(component);
    frame.getContentPane().add(window);
    frame.setResizable(false);
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
    frame.setIconImage(new ImageIcon("res/icon.png").getImage());

    setLayout(new BorderLayout());
    JLabel background = new JLabel(new ImageIcon("res/background.png"));
    frame.add(background);
    background.setLayout(new FlowLayout());

    window.setLayout(null);
    drawButtons();
    frame.repaint();
    frame.pack();
}

private void drawButtons() {

    name = new JLabel("Creation");
    rName = new Rectangle((width/2) - (buttonWidth/2) + 60, 20, buttonWidth, buttonHeight);
    name.setBounds(rName);
    window.add(name);

    play = new JButton("Play");
    rPlay = new Rectangle((width/2) - (buttonWidth/2), 250, buttonWidth, buttonHeight);
    play.setBounds(rPlay);
    window.add(play);

    options = new JButton("Options");
    rOptions = new Rectangle((width/2) - (buttonWidth/2), 350, buttonWidth, buttonHeight);
    options.setBounds(rOptions);
    window.add(options);

    changelog = new JButton("View change-log");
    rChangelog = new Rectangle((width/2) - (buttonWidth/2), 450, buttonWidth, buttonHeight);
    changelog.setBounds(rChangelog);
    window.add(changelog);

    quit = new JButton("Quit");
    rQuit = new Rectangle((width/2) - (buttonWidth/2), 550, buttonWidth, buttonHeight);
    quit.setBounds(rQuit);
    window.add(quit);

    play.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            Component component = new Component();
            frame.dispose();
            component.start();
        }
    });
    options.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {

        }
    });
    changelog.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {

        }
    });
    quit.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {        
            System.exit(0);
        }
    });
}

（如您所见）我的JFrame大小为1280x720。这与背景图像的大小相同，所以我没有看到任何问题。如果有人可以帮我编辑我的代码或给我指点，我只是想在背后显示背景图像。

Answer 1

如果您的GUI将是图像的大小，则将BufferedImage添加到JLabel，并将 JLabel 添加到JFrame的contentPane，而不是一些不显示图像的JPanel。
不要使用null布局和setBounds(...)，而是使用体面的布局管理器。虽然null布局似乎对新手更容易，但这通常只是因为您可能不熟悉如何使用布局管理器，并且相信我，更容易创建和维护GUI使用表现良好的布局管理器。
为JPanel / contentPane提供合适的布局，因为您将向其添加组件。

Answer 2

String filename = "demo//6.jpg";

BufferedImage image = ImageIO.read(new File(filename));

//Create Image Label
JLabel label = new JLabel(new ImageIcon(image));
label.setBounds(0, 0, image.getWidth(), image.getHeight());
lpane.setLayout(null);
lpane.setPreferredSize(new Dimension(image.getWidth(), image.getHeight()));
lpane.add(label, new Integer(JLayeredPane.DEFAULT_LAYER-1));
ImageIcon ic=new ImageIcon("demo//12.jpg");
but.setIcon(ic);

Answer 3

类MyFrame {

public static void main(String arr[])
{
   JPanel panel=new JPanel()
   {
       @Override
       protected void paintComponent(Graphics g)
       {
           try
           {
               BufferedImage image = ImageIO.read(new File("C://Users//MulayamYadav//Desktop//1.jpg"));
               Image image1=image.getScaledInstance(getWidth(), getHeight(), Image.SCALE_SMOOTH);
               g.drawImage(image1, 0, 0, null);
            }catch(Exception ex)
            {
              System.out.println(ex);
            }
        }
   };
   JFrame frame=new JFrame();
   panel.setLayout(new FlowLayout());
   panel.add(new JButton("Button1"));
   panel.add(new JButton("Button2"));
   add(panel);
   frame.setVisible(true);

}

使用Swing将背景图像添加到JFrame

3 个答案: