Question

我无法将图片设置为我的项目的背景下面我已经包含了我的代码到目前为止，它只是我的主页，按钮工作（我自定义我的按钮），我只是想要一些帮助。感谢

public JFrame mainFrame;
private JLabel headerLabel;
private JLabel statusLabel;
private JPanel controlPanel;

private ImageIcon tle = new ImageIcon("title1.gif");
private ImageIcon pbI = new ImageIcon("playbutton.gif");
private ImageIcon ibI = new ImageIcon("instructionbutton.gif");
private ImageIcon qbI = new ImageIcon("quitbutton.gif");
private JButton playButton;
private JButton instructionButton;
private JButton quitButton;
Timer t;
test2 newframe = new test2();
instrpage instrframe = new instrpage();



public static void main(String[] args) {
    new test1();
}

public test1() {
    mainGUI();

}

public void mainGUI() {


    playButton = new JButton(pbI);
    instructionButton = new JButton(ibI);
    quitButton = new JButton(qbI);

    mainFrame = new JFrame("My Major Project");
    mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    mainFrame.setSize(800, 600);
    mainFrame.setLocationRelativeTo(null);
    mainFrame.setLayout(null);

    mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    mainFrame.setLayout(new BorderLayout());
    mainFrame.setContentPane(new JLabel(new ImageIcon("background.gif")));
    mainFrame.setLayout(new FlowLayout());

    controlPanel = new JPanel();
    controlPanel.setLayout(null);
    controlPanel.setSize(mainFrame.getWidth(), mainFrame.getHeight());
    controlPanel.setLocation(0, 0);

    headerLabel = new JLabel("");

    headerLabel.setIcon(tle);

    statusLabel = new JLabel("");
    statusLabel.setSize(350, 100);
    headerLabel.setSize(540, 100);
    statusLabel.setLocation(100, 500);
    headerLabel.setLocation(100, 500);

    playButton.setSize(pbI.getIconWidth(), pbI.getIconHeight());
    playButton.setLocation(mainFrame.getWidth() / 2 - pbI.getIconWidth()
            / 2, 150);
    playButton.setVisible(true);

    instructionButton.setSize(ibI.getIconWidth(), ibI.getIconHeight());
    instructionButton.setLocation(
            mainFrame.getWidth() / 2 - ibI.getIconWidth() / 2, 200);
    instructionButton.setVisible(true);

    quitButton.setSize(qbI.getIconWidth(), qbI.getIconHeight());
    quitButton.setLocation(mainFrame.getWidth() / 2 - qbI.getIconWidth()
            / 2, 250);
    quitButton.setVisible(true);

    controlPanel.add(playButton);
    controlPanel.add(instructionButton);
    controlPanel.add(quitButton);

    controlPanel.add(headerLabel);

    controlPanel.add(statusLabel);

    controlPanel.setVisible(true);
    mainFrame.add(controlPanel);


    mainFrame.setVisible(true);

    showButtonDemo();

    t = new Timer(5, this);
    t.addActionListener(this);
    t.start();

}

public void actionPerformed(ActionEvent e) {

    controlPanel.setSize(mainFrame.getWidth(), mainFrame.getHeight());
    controlPanel.setLocation(0, 0);

    playButton.setSize(pbI.getIconWidth(), pbI.getIconHeight());
    playButton.setLocation(controlPanel.getWidth() / 2 - pbI.getIconWidth()
            / 2, (int) (controlPanel.getHeight() / 2 - pbI.getIconHeight()
            / 2 - mainFrame.getHeight() * 0.1));

    instructionButton.setSize(ibI.getIconWidth(), ibI.getIconHeight());
    instructionButton.setLocation(
            controlPanel.getWidth() / 2 - ibI.getIconWidth() / 2,
            (int) (controlPanel.getHeight() / 2 - pbI.getIconHeight() / 2));

    quitButton.setSize(qbI.getIconWidth(), qbI.getIconHeight());
    quitButton.setLocation(controlPanel.getWidth() / 2 - qbI.getIconWidth()
            / 2, (int) (controlPanel.getHeight() / 2 - pbI.getIconHeight()
            / 2 + mainFrame.getHeight() * 0.1));


            headerLabel.setLocation(mainFrame.getWidth() / 2 - tle.getIconWidth() /2,
            mainFrame.getHeight() - (mainFrame.getHeight() - 75));


}

private void showButtonDemo() {

    playButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
                            mainFrame.remove(controlPanel);
            newframe.controlPanel.setSize(mainFrame.getWidth(),mainFrame.getHeight());
            newframe.controlPanel.setLocation(0,0);
            newframe.headerLabel.setLocation(mainFrame.getWidth() / 2 - 130,
                    mainFrame.getHeight() - (mainFrame.getHeight() - 75));
            newframe.headerLabel.setSize(500,80);
            mainFrame.add(newframe.controlPanel);
            mainFrame.repaint();
        }
    });

    instructionButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            mainFrame.remove(controlPanel);
            instrframe.controlPanel.setSize(mainFrame.getWidth(),mainFrame.getHeight());
            instrframe.controlPanel.setLocation(0,0);
            instrframe.headerLabel.setLocation(mainFrame.getWidth() / 2 - 130,
                    mainFrame.getHeight() - (mainFrame.getHeight() - 75));
            instrframe.headerLabel.setSize(500,80);
            mainFrame.add(instrframe.controlPanel);
            mainFrame.repaint();
        }
    });

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

}

Answer 1

IMO，我们没有直接的方法来做到这一点。但是我们可以创建JComponent的子类，覆盖paintComponent(Graphics g)方法来绘制图像，然后将JFrame的内容窗格设置为此子类。

class ImagePanel extends JComponent {
    private Image bgImage;
    public ImagePanel(Image image) {
        this.bgImage= image;
    }
    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.drawImage(bgImage, 0, 0, this);
    }
}

然后它可以用作：

BufferedImage image = ImageIO.load(...);
JFrame customFrame = new JFrame("Image panel");
customFrame.setContentPane(new ImagePanel(image ));

需要注意的一点是，此代码不会考虑调整图像大小以适应JFrame。

将图像设置为jframe的背景

1 个答案: