I'm trying to make my panel show image as background. I already can do that in NetBeans, but when I build my jar and run it image doesn't show there. I know I have to access it differently. I have seen many tutorials but every one of them shows how to do it with ImageIcon, but I don't need that, I need just Image. Can anyone point out what piece of code do I need to do this? Thanks.
This is my code for backgrounded JPanel:
public class JPanelWB extends JPanel { // Creates JPanel with given image as background.
private Image backgroundImage;
public JPanelWB(String fileName){
try {
backgroundImage = ImageIO.read(new File(fileName));
} catch (IOException ex) {
new JDialog().add(new Label("Could not open image."+ex.getMessage()));
}
}
#Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
// Draw the background image.
g.drawImage(backgroundImage, 0, 0, getWidth(),getHeight(),this);
}
}
Yeah, you're trying to read in the image as a file -- don't do that since files don't exist within a Jar file. Instead read it in as a resource.
Something like so:
public JPanelWB(String resourceName){
try {
// backgroundImage = ImageIO.read(new File(resourceName));
backgroundImage = ImageIO.read(getClass().getResource(resourceName));
} catch (IOException ex) {
new JDialog().add(new Label("Could not open image."+ex.getMessage()));
}
}
But note that resource path is different from file path. The resource path is relative to the location of your class files.
If you want to read new image and import it as background, people smarter than me already answered your question.
But, if your problem is similar to mine, then this migh help:
If you already have images to show, then the point is to call them from absolute path. Executable class form JAR will read drive created inside virtual machine, not the physical drive in your computer.
Put images in short-pathed folder like
C:\J\proj\img\
and call them with absolute path like
"C:\\J\\proj\\img\\your_image.png" // (Don't forget the double backslashes.)
(If you don't mind path lenght, leave them in image folder inside your project package, and call them from there.)
NetBeans will pack them into JAR with absolute path. On execution JRE will create JVM with that path in it, take the images from JAR and put them to that virtual path. Class will be able to find them, because it doesn't read path from physical drive, but from own virtual one newly created inside JVM.
In that case avoiding ImageIcon is just more clutter, not less.
You can add "blackBoard" as JLabel to be background to your JFrame, set its layout to null, something like this:
private JLabel blackBoard;
private JLabel noteToSelf;
//.....
blackBoard = new JLabel();
noteToSelf = new JLabel();
//.....
// putting JLabel "blackBoard" as background into JFrame
blackBoard.setIcon(new ImageIcon("c:\\Java\\images\\MarbleTable.png"));
getContentPane().add(blackBoard);
blackBoard.setBounds(1, 1, 400, 440);
blackBoard.setLayout(null);
and then add components into "blackBoard" instead of your JFrame, like this.
// putting JLabel "noteToSelf" onto background
noteToSelf.setIcon(new ImageIcon("c:\\Java\\images\\Sticker_a1.png"));
// or: noteToSelf.setText("Remind me at 6:30am...");
blackBoard.add(noteToSelf);
noteToSelf.setBounds(noteX, noteY, 64, 48);
Now your JFrame is table board and "blackBoard" is table sheet on it.
Hope this helps.
Related
So I am trying to add an image to a JLabel object which is added to a JPanel called "topPanel" which is part of a JFrame called
"primaryWindow". I have already declared the "topPanel" and "primaryWindow". I found on other forms that you have to create a separate source folder and add the image file in that folder in order to access it and I did so.
However, when I execute the following, the image does not appear to be on the Label. I know that it has nothing to do with adding the JLabel to the panel properly because when I enter a String into the JLabel constructor, the String appears on the panel. An image however does not appear. Am I properly adding the image? I am using a mac if this helps.
private JLabel image = new JLabel();
image.setIcon(new ImageIcon("Check.png"));
topPanel.add(image);
primaryWindow.add(topPanel, BorderLayout.NORTH);
You can also use BufferedImage
BufferedImage myPicture = ImageIO.read(new File("C:\\xx\\xxx\\Check.png.jpg"));
Image scaled = myPicture.getScaledInstance(100,70,Image.SCALE_SMOOTH);
image = new JLabel(new ImageIcon(scaled));
topPanel.add(image);
primaryWindow.add(topPanel, BorderLayout.NORTH);
Note that "C:\\xx\\xxx\\Check.png.jpg" is the path where you save Check.png.
Hope this helped.
The ImageIcon that you passed into the setIcon method of the JLabel could be null. Have you tried to check if it is null before calling setIcon? If you create a "res" resource folder in the root directory of your project, you could try the following:
image.setIcon(new ImageIcon(ImageIO.read(new File("res/Check.png"))));
Additionally, if you are using Eclipse, you should try and refresh the project directory by right clicking and pressing refresh; sometimes Eclipse doesn't register files added.
Lastly, try setting the background of the JPanel to a certain color to see if it is displaying it and make sure its width and height are not 0 (it is possible that the layout you are using changed its size).
I want to know what is the problem in my code that caused .JAR file to be broken? when I double click on jar file it doesn't open but it was fine before adding background image to JFrame.
I created a class called Cube to draw cube and I want to set background image to JFrame, so I added field in Cube class
private BufferedImage bg;
bg initialization in the class constructor
publice Cube() {
bg = ImageIO.read(new File("bg_image.jpg"));
}
this piece of code used to set the background
#Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(bg, 0, 0, this);
}
in main class I created JFrame object to draw the cube
JFrame jf = new JFrame();
jf.add(new Cube());
jf.setEnabled(true);
jf.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
jf.setResizable(false);
jf.setSize( 500, 500 );
jf.setVisible( true );
Since I do not have your jar file there is no way for me to know the problem. You need to access the file as a resource and not as a new file because it is inside the jar. First you should use cmd to run the jar and see if it gives you a stack trace. Use the command: java -jar filename.jar to run the jar via command prompt.
Try using:
Cube.class.getResourceAsStream("bg_image.jpg");
bg = ImageIO.read(new File("bg_image.jpg"));
This code says that bg_image.jpg should be near with .jar
You may put image into resources and load it like:
Cube.class.getClassLoader().getResourceAsStream("bg_image.jpg");
ps: load resources in constructor is bad idea!
import javax.swing.*;
public class SlideShow {
JFrame slide = new JFrame("Slide Show");
public SlideShow(){
slide.setSize(300,400);
slide.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
slide.setVisible(true);
slide.setLocationRelativeTo(null);
JPanel panel = new JPanel();
JLabel label = new JLabel(new ImageIcon("Images/picture1"));
panel.add(label);
slide.add(panel);
}
public static void main(String[] args){
SlideShow slide = new SlideShow();
}
}
I have to create a simple Java GUI that displays some cards. First, I just wanted to test it by displaying one card. For some reason I can't seem to figure out why nothing is being displayed.
You haven't actually used a proper file name "Images/picture1". Should be something like "Images/picture1.png" with the file format
Also image files, generally should be read from the class path, if you plan on having them embedded to the program. To do so, you will first need to put the file in the class path. With most IDE build configurations it's as simple as placing the image in the src. So
ProjectRoot
src
images
picture1.png
Then you would read it like
new ImageIcon(getClass().getResource("/images/picture1.png"));
A better approach would be to use ImageIO.read(). If the file path is incorrect, it will throw an exception, so you know where you're going wrong
Image image = ImageIO.read(getClass().getResource("/images/picture1.png"));
ImageIcon icon = new ImageIcon(image);
You will need to put it in the try/catch block
Also do what codeNinja said about the setVisible() after adding component. Also preferably pack() the frame, instead of setSize()
You need to set the Frame visible after you add all necessary components to it. Move slide.setVisible(true); Down to the bottom of the constructor like this:
...
slide.add(panel);
slide.setVisible(true);
Alternatively you can add slide.revalidate(); at the bottom of your constructor.
Ok so I've been researching this one quiet a bit. I am fairly new to java but thought that this one would be easy. Ive tried just about every way that has been answered on this site and still no luck, and usually when I look here I am able to find a answer that fits what I am looking for. Does anyone know how to change the Java icon in the top corner of the JFrame. I'm pretty positive that its not my file path either because all my images are in the same folder and they all work, this is the only one that I can't seem to get to work.
This is the first part my code for the main menu of my program, everything works except when i try to add the icon image. The code I've entered below does not have anything in it for the JFrame IconImage, I removed it since it didn't work. So if there is someone who knows how to get it working with this code that would be highly appreciated, thank you very much in advanced!
public class MainFrame
{
private MyPanel main;
private MyPanel2 create;
private MyPanel3 update;
private MyPanel4 find;
JFrame frame = new JFrame("Main Menu:");
public void displayGUI()
{
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel contentPane = new JPanel();
contentPane.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));
contentPane.setLayout(new CardLayout());
main = new MyPanel(contentPane, this);
create = new MyPanel2(contentPane);
update = new MyPanel3(contentPane);
find = new MyPanel4(contentPane);
contentPane.add(main, "Main Menu");
contentPane.add(create, "Create Part");
contentPane.add(update, "Update Part");
contentPane.add(find, "Find Part");
frame.setLocation(200, 200);
frame.setSize(700, 580);
frame.setContentPane(contentPane);
frame.setVisible(true);
}
I have an answer for you. First, make sure that the images are in a folder, not a package. Next, insert this line of code:
Image image = Toolkit.getDefaultToolkit().getImage(getClass().getResource("path/to/image.png"));
ImageIcon icon = new ImageIcon( );
setIconImage(icon.getImage());
This code gets the image from the class path, and returns it as a image icon, and then it sets it. This should add the image icon to the application. If it doesn't, then tell me.
EDIT: After you told me that that didn't work then I decided to take a second crack at it...
First, put your images into a completely separate folder. I usually call this /res. Next, put your image in there. Now, for loading I took a completely different route. I decided to use ImageIO instead of default loading. To load the image, you use this code:
try {
frame.setIconImage(ImageIO.read(new File("res/icon.png")));
}
catch (IOException exc) {
exc.printStackTrace();
}
ImageIO works a lot better for loading images. If this still doesn't work then please tell me.
If you want to export this as a JAR then put a folder the same name as you used in the program in the same directory as the JAR.
For example in a NetBeans project, create a resources folder in the src folder.
Put your images (jpg, ...) in there.
Whether you use ImageIO or Toolkit (including getResource),
you must include a leading / in your path to the image file:
Image image = Toolkit.getDefaultToolkit().getImage(getClass().getResource("/resources/agfa_icon.jpg"));
setIconImage(image);
If this code is inside your JFrame class, the image is added to the frame as an icon in your title bar.
This works pretty fine for me.
Just add this after you've created your JFrame.
try {
Image image = new ImageIcon("/icons/image.jpg").getImage();
frame.setIconImage(image);
}catch(Exception e){
System.out.println("Application icon not found");
}
Paste your image icon (fav.png) in the same package first,
Write following code in constructor of JFrame:
setIconImage(Toolkit.getDefaultToolkit().getImage(getClass().getResource("fav.png")));
Note:- fav.png is the name of icon
this.setIconImage(new ImageIcon(getClass().getResource("/iconsfolder/iconsname.jpg")).getImage());
// sets the Global icon for the system
try this code put after this code:
public void displayGUI()
{
I wrote a method in order to get icon for my swing:
public Icon getIcon(String iconName) {
Icon icon = null;
if(iconName.equals("NEXT")){
icon = new ImageIcon( getClass().getResource("resources/img/next.png" ) );
}
return icon;
}
but
icon = new ImageIcon( getClass().getResource("resources/img/next.png" ) );
goes in null pointer
I created a source folder "resources" and a folder "img" inside it with "next.png" icon
Where's the problem?
Thanks
For this to work, the resources folder should be in the same folder as the folder corresponding to the package of this.getClass(). To start from the root of the classpath, use getClass().getResource("/resources/img/next.png"). (with a leading /)
so, I found the right method:
public static ImageIcon getImageIcon(String iconName) {
ImageIcon imageIcon = null;
if(iconName.equals("DOWNLOAD")){
imageIcon = new ImageIcon(ImagesLocation.class.getResource("/img/download.png"));
}
return imageIcon;
}
with a "resources" source folder at the same level of the project and with an img folder inside (package styled)
ImagesLocation is a generic class containing this method
For those in need of help that have come across this page in Google - I wrote an answer in another StackOverflow question giving the best way to handle images in JAVA apps so that you can easily access the images for all image method types in Java:
This IS the best way to handle all images and icons in a JAR App.
Once you've zipped up all of your images and icons into its own JAR file - Configure your build path by adding the images JAR file into your libraries tab so that its now included in your classpath.
Then simply use the following 3x lines of code at the start of your constuctor to access any image you need for anything including a SystemTray image which doesn't accept the simple ImageIcon's as its main icon (weird I know). The 3x lines are:
URL iconUrl = this.getClass().getResource("/image-iconb.png");
Toolkit tk = this.getToolkit();
someimgicon = tk.getImage(iconUrl);
(someimgicon is just a constructor declared Image variable)
Now you can set a window icon as simply as:
setIconImage(someimgicon);
and at the same time use the same variable when setting the System TrayIcon by declaring:
trayIcon = new TrayIcon(someimgicon, "SystemTray Demo", popupMenu);
The above allows you to declare Images or ImageIcons easily and centrally without running the risk of not keeping image resources in the right place. It keeps it nice and tidy, with the JAR containing all your images automatically compiled at run time and distribution of your program.
As a bonus, once the JAR is registered in your classpath - you can keep adding any other images into the same JAR at any time without any fuss too - Everything just works and the added images are instantly available to your app.
Much better in my view.