How to set an image as a background for Frame in Swing GUI of java?
There is no concept of a "background image" in a JPanel
, so one would have to write their own way to implement such a feature.
One way to achieve this would be to override the paintComponent
method to draw a background image on each time the JPanel
is refreshed.
For example, one would subclass a JPanel
, and add a field to hold the background image, and override the paintComponent
method:
public class JPanelWithBackground extends JPanel {
private Image backgroundImage;
// Some code to initialize the background image.
// Here, we use the constructor to load the image. This
// can vary depending on the use case of the panel.
public JPanelWithBackground(String fileName) throws IOException {
backgroundImage = ImageIO.read(new File(fileName));
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
// Draw the background image.
g.drawImage(backgroundImage, 0, 0, this);
}
}
(Above code has not been tested.)
The following code could be used to add the JPanelWithBackground
into a JFrame
:
JFrame f = new JFrame();
f.getContentPane().add(new JPanelWithBackground("sample.jpeg"));
In this example, the ImageIO.read(File)
method was used to read in the external JPEG file.
How to set image as background in Java Spring GUI (JFrame)
I believe there's no helper method that does this for you. This type of question has been asked and answered before, so i would just share a link to the accepted answer. You could look at other examples on that thread too and then choose the one that best suits you.
https://stackoverflow.com/a/1466278/12796448
Look at this example too
https://www.tutorialspoint.com/how-to-add-background-image-to-jframe-in-java
I believe the best way to achieve what you want is to paint the background of your container with the desired image. Look at the links i shared, they might help.
Setting a background image on a JFrame in java
gui.setContentPane(new JLabel(new ImageIcon(ImageIO.read(new File("img.jpg")))));
Reasonable approach, but the problem is that by default a JLabel doesn't use a layout manager to you can't easily add components to it. Try:
JLabel background = new JLabel(...);
background.setLayout( new BorderLayout() );
gui.setContentPane( background );
Background Image of a window in Java using JFrame
Just a few tips
- Its usually best to put a panfel within a frame and then add components to that. Makes for good containment when swing classes get a bit bigger.
- Its better to create a resource folder for your projects. Create one in the source of your project e.g. where the src and bin folders are located for your project and name it "resources".
- When creating and image icon its good practice to surround with a try catch so you can give appropriate errors and locate easily, or even handle the error at runtime.
With all that being said, here is your code with a little extra. It creates a panel to hold the jlabel(image) and it adds that panel to the frame. It creates an image icon with a quick method, all you have to do is pass in the file name. This method assumes you have created the folder in your project directory called resources and placed your image in there.
public static void main(String[] args) {
//Window
JFrame mainWindow = new JFrame("Day One");
mainWindow.setExtendedState(JFrame.MAXIMIZED_BOTH);
mainWindow.setUndecorated(true);
//Create image
JLabel imageHolder = new JLabel();
imageHolder.setIcon(makeImageIcon("example.png"));
//Add image to panel, add panel to frame
JPanel panel = new JPanel();
panel.add(imageHolder);
mainWindow.add(panel);
mainWindow.setVisible(true);
}
//Creates imageicont from filename
public static ImageIcon makeImageIcon(String filename) {
BufferedImage myPicture = null;
try {
myPicture = ImageIO.read(new File("resources/" + filename));
} catch (IOException e) {
e.printStackTrace();
}
return new ImageIcon(myPicture);
}
Hope this helps
JFrame background image
This is a simple example for adding the background image in a JFrame:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class BackgroundImageJFrame extends JFrame
{
JButton b1;
JLabel l1;
public BackgroundImageJFrame()
{
setTitle("Background Color for JFrame");
setSize(400,400);
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
/*
One way
-----------------
setLayout(new BorderLayout());
JLabel background=new JLabel(new ImageIcon("C:\\Users\\Computer\\Downloads\\colorful design.png"));
add(background);
background.setLayout(new FlowLayout());
l1=new JLabel("Here is a button");
b1=new JButton("I am a button");
background.add(l1);
background.add(b1);
*/
// Another way
setLayout(new BorderLayout());
setContentPane(new JLabel(new ImageIcon("C:\\Users\\Computer\\Downloads\\colorful design.png")));
setLayout(new FlowLayout());
l1=new JLabel("Here is a button");
b1=new JButton("I am a button");
add(l1);
add(b1);
// Just for refresh :) Not optional!
setSize(399,399);
setSize(400,400);
}
public static void main(String args[])
{
new BackgroundImageJFrame();
}
}
- Click here for more info
Java swing gui change background of jlabel and make it reset
The background is painted beneath the icon
, so if the icon
is not reset, then it will continue to be displayed.
You can simply set the icon property by passing it null
, for example
public JButton createBtnLeft() {
JButton btnLeft = new JButton("left");
btnLeft.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//TODO
lblPicture2.setIcon(null);
lblPicture2.setBackground(Color.BLACK);
lblPicture1.setIcon(new ImageIcon(ExampleGUI.class.getResource("/gui/schlange.gif")));
}
});
btnLeft.setFont(new Font("Lucida Grande", Font.PLAIN, 14));
return btnLeft;
}
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