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Unable to add other components to window after creating background using JLabel in Java

I want to create a java Application like a widget. Here is my code below
package newpackage;
public class MainFrame extends JFrame {
JLabel imageLabel = new JLabel();
public MainFrame() {
try {
this.setUndecorated(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(new Dimension(360, 360));
ImageIcon ii = new ImageIcon(this.getClass().getResource("imageexcel.gif"));
imageLabel.setIcon(ii);
add(imageLabel, java.awt.BorderLayout.CENTER);
this.setVisible(true);
Shape shape=new Ellipse2D.Float(0,0,360,360);
AWTUtilities.setWindowShape(this, shape);
AWTUtilities.setWindowOpaque(this, false);
imageLabel.add(new JButton("START"));
} catch (Exception exception) {
exception.printStackTrace();
}
}
public static void main(String[] args) {
new MainFrame();
}
}
In the above code, I have done the following:
Created a Frame
Removed the Title Bar
Added the Background using JLabel
Changed the shape of window as circle according to the shape of image
Now I would like to add some components in to it and perform some action with them but no component is visible after adding.
I have tried adding to Frame as well as JLabel and no use from either.
This is the image i used for background
Please help me to proceed further....
Thanking you

JLabels use null layouts by default, and so your button will default to size 0,0. Try giving it a decent layout manager, even FlowLayout would likely work. Another solution is to keep the null layout and set the sizes and positions of added components, but this route is a dangerous route and one I don't recommend.
Actually a GridBagLayout works nice to center the components. Also add all components before calling setVisible(true):
imageLabel.setLayout(new GridBagLayout());
this.setUndecorated(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(new Dimension(360, 360));
ImageIcon ii = new ImageIcon(this.getClass().getResource("imageexcel.gif"));
imageLabel.setIcon(ii);
add(imageLabel, java.awt.BorderLayout.CENTER);
imageLabel.add(new JButton("START"));
this.setVisible(true);
or better?
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.GridBagLayout;
import java.awt.Image;
import java.awt.Shape;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.awt.geom.Ellipse2D;
import java.net.URL;
import javax.swing.*;
import com.sun.awt.AWTUtilities;
#SuppressWarnings("serial")
public class MainPanelOvalFrame extends JPanel {
private static final String RESOURCE_PATH = "imageexcel.gif";
private Window window;
private Image img;
public MainPanelOvalFrame(Window window, Image image) {
this.window = window;
this.img = image;
setLayout(new GridBagLayout());
add(new JButton(new StartAction("Start", KeyEvent.VK_S)));
int w = image.getWidth(this);
int h = image.getHeight(this);
Shape shape = new Ellipse2D.Float(0, 0, w, h);
AWTUtilities.setWindowShape(window, shape);
AWTUtilities.setWindowOpaque(window, false);
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (img != null) {
g.drawImage(img, 0, 0, this);
}
}
#Override
public Dimension getPreferredSize() {
if (isPreferredSizeSet() || img == null) {
return super.getPreferredSize();
}
int w = img.getWidth(this);
int h = img.getHeight(this);
return new Dimension(w, h);
}
private class StartAction extends AbstractAction {
public StartAction(String name, int mnemonic) {
super(name);
putValue(MNEMONIC_KEY, mnemonic);
}
#Override
public void actionPerformed(ActionEvent e) {
window.dispose();
}
}
private static void createAndShowGui() {
JFrame frame = new JFrame();
frame.setUndecorated(true);
URL imgUrl = MainPanelOvalFrame.class.getResource(RESOURCE_PATH);
Image image = new ImageIcon(imgUrl).getImage();
MainPanelOvalFrame mainPanel = new MainPanelOvalFrame(frame, image);
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}

You just need to set a Layout manager for imageLabel ,or use null as the Layout manager, then set the size and location of the JButton manually.
to use Layout Manager
imageLabel.setIcon(ii);
imageLabel.setLayout(new FlowLayout());
imageLabel.add(new JButton("START"));
//need to setLayout and add JButton before setVisible(true)
add(imageLabel, java.awt.BorderLayout.CENTER);
this.setVisible(true);
to use null layout
JButton j=new JButton("START");
j.setSize(100,50);
j.setLocation(imageLabel.getWidth()/2-j.getWidth()/2, imageLabel.getHeight()/2-j.getHeight()/2);
//then add Button into imageLabel
imageLabel.add(j);
Layout manager is usually recommended because it can fit different environment.

How to draw PNG Image onto JPanel?

I'm trying to draw a image onto a JPanel by overriding the paintComponent method. However, I'm having no luck with it at all and I don't know why.
Here's the code I've got at the moment:
DrawPanel
public class DrawPanel extends JPanel{
private Image backgroundImg;
public DrawPanel()
{
backgroundImg = Toolkit.getDefaultToolkit().createImage("C:\\Users\\Administrator\\workspace\\Scrub\\src\\loginBackground.png");
}
#Override
public void paintComponent(Graphics g)
{
super.paintComponent(g);
g.drawImage(backgroundImg, 0, 0, null);
}
}
LoginWindow Class
import java.awt.*;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class LoginWindow extends Window{
private DrawPanel panel;
public LoginWindow(int width, int height)
{
super("", width, height);
panel = new DrawPanel();
this.add(panel);
panel.setVisible(true);
}
}
Main
public class Main
{
public static void main(String[] args)
{
LoginWindow loginWindow = new LoginWindow(500, 300);
}
}

There are lots of reasons this might not work
The image might not be getting loaded. You should use ImageIO.read instead, as it will throw an IOException if something goes wrong
The layout manager is using the preferred size of your panel, which is defaulted to 0x0, making the component effectively invisible
You're not setting the window to be visible...
For example
public class DrawPanel extends JPanel{
//...
public Dimension getPreferredSize() {
return backgroundImg == null ? new Dimesion(100, 100) : new Dimension(backgroundImg.getWidth(this), backgroundImg.gtHeight(this));
}
And then in your Window class...
public LoginWindow(int width, int height)
{
super("", width, height);
panel = new DrawPanel();
this.add(panel);
// Swing components are visible by default
//panel.setVisible(true);
// windows aren't
setVisible(true);
}
A simpler soliton would be to use a JLabel...
setLayout(new BorderLayout());
BufferedImage img = ImageIO.read(new File(...));
JLabel label = new JLabel(new ImageIcon(img));
add(label);
setVisible(true);
Take a look at How to use Labels and Reading/Loading an Image for more details

Backgroundproblem in Swing, without Netbeans

I am a total Beginner and while I had most of the Application right away. I can t make a background picture for my swing gui.
I ve read that you should do it with the overriding the paint methode, which I did. But somewhere I am making a mistake. Since nothing chances, except that the Button is invisible until I go over it with the Mouse. I tried several things, maybe one of you can see the Problem and help me out? Thanks a lot :)
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
/**
*
* #author Shore
*/
public class GUI extends JFrame implements ActionListener {
Container c;
JButton überprüfungsButton = new JButton();
JTextField eingabeTextField = new JTextField();
JTextArea ausgabeTextFeld = new JTextArea();
Image hintergrundBild;
public GUI(){
this.hintergrundBild = Toolkit.getDefaultToolkit().getImage( "Bild2.jpg" );
c = getContentPane();
c.setLayout(new BorderLayout());
c.setBackground(Color.LIGHT_GRAY);
überprüfungsButton = new JButton("Test");
überprüfungsButton.addActionListener(this);
c.add(überprüfungsButton, BorderLayout.CENTER);
eingabeTextField = new JTextField(40);
c.add(eingabeTextField, BorderLayout.PAGE_START);
eingabeTextField.setOpaque(false);
ausgabeTextFeld = new JTextArea(30,30);
c.add(ausgabeTextFeld, BorderLayout.PAGE_END);
ausgabeTextFeld.setOpaque(false);
}
public static void main(String[] args) {
GUI fenster = new GUI();
fenster.setTitle("Für");
fenster.setSize(800, 800);
fenster.setVisible(true);
fenster.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
protected void paintComponent(Graphics g) {
if (hintergrundBild != null) {
g.drawImage(hintergrundBild, 0, 0, getWidth(), getHeight(), null);
}
}
#Override
public void actionPerformed(ActionEvent e) {
if(e.getSource() == überprüfungsButton){
Thanks whoever took the Time to take a look at it.
Update: I actually can resolve the Problem with Netbeans and the swing-GUI Creator.
However, I am still very curious!
If you could still help me, I would appreciate it.

JFrame does not override paintComponent so Swing will not invoke it.
Adding the #Override annotation above the method will show that the method is not contained in the super class.
The simplest way to implement a background image is to create a subclass of JPanel and override paintComponent there.
Update:
There are many examples on the web where the class JFrame is extended. From a design point is view this is not necessary as you typically do not any new functionality to the frame. For this reason just creating a direct instance & using is better (shown):
public class BackGroundProblem {
public static void main(String[] args) throws IOException {
final Image image = ImageIO.read(new URL("http://news.beloblog.com/ProJo_Blogs/architecturehereandthere/hallstattsumm.jpg"));
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
JFrame frame = new JFrame();
JPanel backgroundPanel = new ImagePanel(image);
backgroundPanel.add(new JButton("Sample Button 1"));
backgroundPanel.add(new JButton("Sample Button 2"));
frame.add(backgroundPanel);
frame.setLocationByPlatform(true);
frame.pack();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
});
}
}
class ImagePanel extends JPanel {
private static final long serialVersionUID = 1L;
private Image image;
ImagePanel(Image image) {
this.image = image;
};
#Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(image, 0, 0, getWidth(), getHeight(), this);
}
#Override
public Dimension getPreferredSize() {
return new Dimension(800, 600);
}
}

How to put an image in the background of a window

I'm almost done with my hangman java code. I want to add a picture in the background though.(nightsky.png) How do I do this in the paint graphics method? I created a imageicon in the beginning.
public HangmanRevised() {
setSize(600,400);
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLayout(new FlowLayout());
ImageIcon background = new ImageIcon("nightsky.png");
Letter = new TextField();
JLabel label = new JLabel("pick a Letter");
button = new Button("Enter");
add(label);
add(button);
add(Letter);
button.addActionListener(this);
createGame();
}
public void paint(Graphics g) {
super.paint(g);
g.drawImage(background, 0, 156, Color.green, button);
}

If you are painting the image at its actual size, there is no need to do any custom painting.
As has already been suggested you just add the Icon to a JLabel and add the label to your frame (or panel). Then if you want the image to appear at a certion position within the label, then you simply add an EmptyBorder to the label.

By overriding a JPanel, you can redo paintComponent() to paint the image and the JPanel itself should have a paint function for its children (although I haven't tested this functionality).
http://www.java2s.com/Code/Java/Swing-JFC/Panelwithbackgroundimage.htm
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class ImageTest {
public static void main(String[] args) {
ImagePanel panel = new ImagePanel(new ImageIcon("images/background.png").getImage());
JFrame frame = new JFrame();
frame.getContentPane().add(panel);
frame.pack();
frame.setVisible(true);
}
}
class ImagePanel extends JPanel {
private Image img;
public ImagePanel(String img) {
this(new ImageIcon(img).getImage());
}
public ImagePanel(Image img) {
this.img = img;
Dimension size = new Dimension(img.getWidth(null), img.getHeight(null));
setPreferredSize(size);
setMinimumSize(size);
setMaximumSize(size);
setSize(size);
setLayout(null);
}
public void paintComponent(Graphics g) {
g.drawImage(img, 0, 0, null);
}
}

You need to put the background somewhere, i.e.:
//add the following in the HangmanRevised() constructor (?)
button.addActionListener(this);
//To add
ImagePanel panel = new ImagePanel(background.getImage());
JFrame frame = new JFrame();
frame.getContentPane().add(panel);
frame.setSize(800, 600);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
add(frame);
//end...
createGame();

You can also construct any image you like on-the-fly using 2D Graphics, as suggested in RotatableImage.

Background image in java

i'm trying to put an image as a background of my interface in java , i tried to write a class that does that and using it , but is there a simpler way to do that .
here 's the code i used:
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import javax.swing.BorderFactory;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class BackgroundImagePanelExample {
// Set up contraints so that the user supplied component and the
// background image label overlap and resize identically
private static final GridBagConstraints gbc;
static {
gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.weightx = 1.0;
gbc.weighty = 1.0;
gbc.fill = GridBagConstraints.BOTH;
gbc.anchor = GridBagConstraints.NORTHWEST;
}
/**
* Wraps a Swing JComponent in a background image. Simply invokes the overloded
* variant with Top/Leading alignment for background image.
*
* #param component - to wrap in the a background image
* #param backgroundIcon - the background image (Icon)
* #return the wrapping JPanel
*/
public static JPanel wrapInBackgroundImage(JComponent component,
Icon backgroundIcon) {
return wrapInBackgroundImage(
component,
backgroundIcon,
JLabel.TOP,
JLabel.LEADING);
}
/**
* Wraps a Swing JComponent in a background image. The vertical and horizontal
* alignment of background image can be specified using the alignment
* contants from JLabel.
*
* #param component - to wrap in the a background image
* #param backgroundIcon - the background image (Icon)
* #param verticalAlignment - vertical alignment. See contants in JLabel.
* #param horizontalAlignment - horizontal alignment. See contants in JLabel.
* #return the wrapping JPanel
*/
public static JPanel wrapInBackgroundImage(JComponent component,
Icon backgroundIcon,
int verticalAlignment,
int horizontalAlignment) {
// make the passed in swing component transparent
component.setOpaque(false);
// create wrapper JPanel
JPanel backgroundPanel = new JPanel(new GridBagLayout());
// add the passed in swing component first to ensure that it is in front
backgroundPanel.add(component, gbc);
// create a label to paint the background image
JLabel backgroundImage = new JLabel(backgroundIcon);
// set minimum and preferred sizes so that the size of the image
// does not affect the layout size
backgroundImage.setPreferredSize(new Dimension(1, 1));
backgroundImage.setMinimumSize(new Dimension(1, 1));
// align the image as specified.
backgroundImage.setVerticalAlignment(verticalAlignment);
backgroundImage.setHorizontalAlignment(horizontalAlignment);
// add the background label
backgroundPanel.add(backgroundImage, gbc);
// return the wrapper
return backgroundPanel;
}
public static void main(String[] args) {
JFrame frame = new JFrame("Background Image Panel Example");
// Create some GUI
JPanel foregroundPanel = new JPanel(new BorderLayout(10, 10));
foregroundPanel.setBorder(
BorderFactory.createEmptyBorder(10, 10, 10, 10));
foregroundPanel.setOpaque(false);
foregroundPanel.add(new JLabel("Comment:"), BorderLayout.NORTH);
foregroundPanel.add(new JScrollPane(new JTextArea(3, 10)),
BorderLayout.CENTER);
foregroundPanel.add(
new JLabel(
"Please enter your comments in text box above."
+ " HTML syntax is allowed."), BorderLayout.SOUTH);
frame.setContentPane(wrapInBackgroundImage(foregroundPanel,
new ImageIcon(
BackgroundImagePanelExample.class.getResource("backgd.jpg"))));
frame.pack();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
thanks

I'm guessing you're getting java.lang.NullPointerException because backgd.jpg can't be found by getResource(). You might be able to put the image file alongside the source file and rebuild the project. Alternatively, you can load it from the file system as a temporary measure while you sort things out.
frame.setContentPane(wrapInBackgroundImage(
foregroundPanel, new ImageIcon("image.jpg")));

I dont actually see what are you asking. If you are asking, whether there is simpler way to build swing apps - than answer is YES. Use NetBeans IDE with Swing builder which produces very reasonable generated code and lets you edit whole bunch of componenets. Hand written Swing is more often "broken" than generated code from NetBeans, and much much more time consuming ...

import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class ImageTest {
public static void main(String[] args) {
ImagePanel panel = new ImagePanel(new ImageIcon("images/background.png").getImage());
JFrame frame = new JFrame();
frame.getContentPane().add(panel);
frame.pack();
frame.setVisible(true);
}
}
class ImagePanel extends JPanel {
private Image img;
public ImagePanel(String img) {
this(new ImageIcon(img).getImage());
}
public ImagePanel(Image img) {
this.img = img;
Dimension size = new Dimension(img.getWidth(null), img.getHeight(null));
setPreferredSize(size);
setMinimumSize(size);
setMaximumSize(size);
setSize(size);
setLayout(null);
}
public void paintComponent(Graphics g) {
g.drawImage(img, 0, 0, null);
}
}

public class BackgroundPanel extends JPanel {
private static final long serialVersionUID = 1L;
Image image;
public BackgroundPanel() {
super();
initialize();
}
/**
* This method initializes this
*
* #return void
*/
private void initialize() {
try {
image = new ImageIcon(getClass().getResource("background.jpg")).getImage();
} catch (Exception e) {
/*handled in paintComponent()*/
}
this.setSize(800, 470);
this.setLayout(null);
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if(image != null) {
g.drawImage(image, 0,0,this.getWidth(),this.getHeight(),this);
}
}
}