如何在带有图像的叠加布局上添加按钮

Question

我想将图像设置为背景以便在其上方放置按钮，所以我使用了叠加层。 Ι 只是想把按钮的位置改到图片上面，但是找不到办法

public static void main(String[] args){

    Menu program = new Menu();
    SwingUtilities.invokeLater(program);

}


public void run() {

    JFrame frame = new JFrame () ;
    Get_size get_size = new Get_size() ;
    get_size.Size_screen() ;
    int h = (int)height ;
    int w = (int) width;
    frame.setSize(w , h );

    JPanel panel = new JPanel();

    //Create the first  button
    JButton appointment = new JButton("Appointment menu & Diary");
    appointment.setPreferredSize(new Dimension(500,32));
    appointment.setFont(new Font("Algerian", Font.PLAIN , 24));
    panel.add(appointment) ;

    //Create the second  button
    JButton patient_profile = new JButton("Patient Profile");
    patient_profile.setPreferredSize(new Dimension(300, 32));
    patient_profile.setFont(new Font("Algerian", Font.PLAIN , 24));
    panel.add(patient_profile) ;


    JPanel over = new JPanel();
    LayoutManager overlay = new OverlayLayout(over);
    over.setLayout(overlay);

    JPanel imagen1 = new JPanel();
    ImageIcon image = new ImageIcon("menu.jpg") ;



    imagen1.add(new JLabel(image));

    over.add(imagen1);
    over.add(panel);
    frame.add(over);



    //sets the size of the frame
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    //makes it so you can close
    frame.setVisible(true);

   // Set the frame of the size non-resizable
   frame.setResizable(false);
}

Answer 1

您必须定义布局。是否为空或框架布局或边框等

在此处查找 https://docs.oracle.com/javase/tutorial/uiswing/layout/visual.html

Answer 2

over.add(imagen1);
over.add(panel);

Swing 以与添加组件相反的顺序绘制组件。所以上面的代码将绘制面板，然后在面板顶部绘制图像，因此您只会看到图像。

代码应该反过来：

over.add(panel);
over.add(imagen1);

现在面板将绘制在图像之上。但是，由于面板是不透明的，您将看不到图像，因此您还需要使面板不透明：

JPanel panel = new JPanel();
panel.setOpaque(false);

如何在带有图像的叠加布局上添加按钮

How to add buttons on an overlay layout with an image

java

swing

overlay

image