如何在图像上放置JButton? [英] how can i put a JButton on an image?

问题描述

我正在尝试修复一个JFrame，该JFrame上将有一个背景图像，并且在图像JButton上将执行一些命令.我尝试不使用布局就这样做，因为我想在JFrame的某些特定位置放置小按钮，但是每次执行此操作时，背景图像就会移到最前面，或者JFrame的大小等于JFrame的大小.使用以下代码，JButton的大小与JFrame相同.我试图更改JButton的大小和位置，但是什么也没有.你能帮我吗?

I am trying to fix a JFrame where there will be a background image and on the image JButtons which will do some commands. I try to do it without layout because i want to put small buttons in some specific locations on the JFrame but every time i do it, the background image comes to the front or the JFrame has size equal to the JFrame size. With the following code, the JButton has the same size to JFrame. I have tried to change the size and location of the JButton but nothing. Can you help me please?

这是代码

public final class Test extends JComponent
{
 private Image background;
 private JFrame frame;
 private Dimension dimension;

public Test()
{  
    dimension = new Dimension(15, 15);
    frame = new JFrame("Iphone");
    frame.pack();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.getContentPane().add(this);
    frame.setBounds(641, 0, 344, 655);
    frame.setVisible(true);

    test = displayButton("tigka");
    frame.getContentPane().add(test);
}

public void update(Graphics g)
{
    paint(g);
}


public void paintComponent(Graphics g)
{
    super.paintComponents(g);
    g.drawImage(background, 0, 25, null); // draw background

//label();

// label();

推荐答案

您需要更改content pane以获得Frame的背景.

You need to change the content pane to get a background for your Frame.

public static void main(String[] args) throws IOException {

    JFrame frame = new JFrame("Test");

    frame.setContentPane(new JPanel() {
        BufferedImage image = ImageIO.read(new URL("http://upload.wikimedia.org/wikipedia/en/2/24/Lenna.png"));
        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            g.drawImage(image, 0, 0, 300, 300, this);
        }
    });

    frame.add(new JButton("Test Button"));

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(300, 300);
    frame.setVisible(true);
}

输出:

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