I looked at other answers and tried:
ImageIcon img = new ImageIcon(url);
setIconImage(img.getImage());
and:
URL imgURL = getClass().getClassLoader().getResource(url);
if (imgURL != null) {
System.out.println("Found icon image: "+imgURL);
Image image=Toolkit.getDefaultToolkit().getImage(imgURL);
setIconImage(image);
} else {
System.err.println("Could not find icon image");
}
Within the JFrame class and I put the image file in the resource folder, and also the same folder as my .java files and the root folder of my project and even included the "/" symbol at the beginning of the URL string but nothing is working. I was wondering if anyone tried it lately and got it working?
I don't know what's inside your url string but there is another way to set the icon to a JFrame:
frame.setIconImage((Image)ImageIO.read(getClass().getResourceAsStream("/imagename.png")));
The / symbol means that your path is relative to your project root.
EDIT:
JFrame.setIconImage(Image image) doesn't work on macOS.
Instead you can use Application.getApplication().setDockIconImage(Image image) of the com.apple.eawt.Application package to get it work. (as mentioned by #Valencia Starr)
I got it to work.
So apparently Macs come installed with a library and I also had to make sure I had Java 1.8 in my build path.
I imported the com.apple.eawt.Application package and used Application.getApplication().setDockIconImage(image) which works on macOS and not on Windows.
Related
I'm new at Java and also swing. I just created a small app using JFrame and added some buttons and textFields, also I have a method which set the icon that I want for the taskbar and the one in the left corner.
When I run the program in Netbeans everything seems correctly, but when I build the project the icon it's not showing up. I tried a lot of things but none of them worked for me.
here's the method that I use for the program:
private void setIcon() {
ImageIcon imageIcon = new ImageIcon("src/main/java/icons/steam.png");
this.setIconImage(imageIcon.getImage());
}
And I call the method from the constructor.
Thank you.
EDIT 1:
Implementing what Andrew said, now I have this:
BufferedImage img = null;
try {
URL url = getClass().getResource("src/main/java/icons/steam.png");
img = ImageIO.read(url);
} catch (IOException e) {
}
this.setIconImage(img);
And that's on the constructor. But when I run it I get:
Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: input == null!
at java.desktop/javax.imageio.ImageIO.read(ImageIO.java:1400)
I tried different paths but I can't get it. And yes, I'm sure that "steam.png" is there.
I been looking for a solution to this and I finally get it (thanks to Andrew trough the comments)
First I edited my code as you can see in EDIT 1
After that, I got an IllegalArgumentException and the problem was that I didn't have a "resources" folder under /src
So I created my resources folder under src/main/resources and put my image inside
Then I got it using
URL url = getClass().getResource("/icons/steam.png");
img = ImageIO.read(url);
And that was the fix for my problem, now when I run the program images are now loaded.
Thank you so much!
I'm developing a cross platform desktop application using Jython and Swing, and I found a hitch.
I would like to develop a button that allows me to load an image in its background and to change it when I reclick on the image loaded.
I attach as an example some pictures on how I would like my widget to be.
Upload pane without image
And then, when I load an image:
Upload Pane with image
I tried with the following code:
fd = FileDialog(self, "Scegli un'immagine", FileDialog.LOAD)
fd.setFile(';*.'.join(("*.bmp","jpg","jpeg","wbmp","png","gif")))
fd.setVisible(True)
fileName = fd.getFile()
if fileName != None :
fileAbsPath = os.path.abspath(fileName)
"""'self.bigDict['imgButton']' is the current JButton"""
self.bigDict['imgButton'].setIcon(ImageIcon(fileAbsPath))
When I click on "Open", the image is not inserted into the button. I do not understand why.
I also tried with the following code:
if fileName != None :
fileAbsPath = os.path.abspath(fileName)
img = ImageIO.read(getClass().getResource(fileAbsPath))
self.bigDict['imgButton'].setIcon(img)
In the above example the following error is reported:
img = ImageIO.read(getClass().getResource(fileAbsPath))
TypeError: getClass(): expected 1 args; got 0
I would be curious to know why the button is not updated with the image loaded, and why the above error in java would not happen.
Thanks in advance!
getClass() needs 1 argument: the implicit this argument. You must call the method on an object, or use the MyClass.class notation.
The problem is very simple.
When an image is loaded with FileDialog it is "virtually located" in the FileDialog window, but the image does not exist. I realized this when I tried to copy the image from the absolute path to the destination folder, using shutil.copy2(self.imgAbsPath, destinationPath+'/'+self.imgName), which reported an error message indicating that the image does not exist.
To provide the concrete path of a file, it is necessary to add information about the folder where it is located.
In practice you have to create the relative path, before generating the absolute one:
fd = FileDialog(self, "Scegli un'immagine", FileDialog.LOAD)
fd.setFile(';*.'.join(("*.bmp","jpg","jpeg","wbmp","png","gif")))
fd.setVisible(True)
self.imgName = fd.getFile()
relativePath = fd.getDirectory() + fd.getFile() """Here is the missing piece!"""
if self.imgName != None:
self.imgAbsPath = os.path.abspath(relativePath) """Here the absolute path is correctly obtained!"""
self.bigDict['imgButton'].setIcon(ImageIcon(ImageIcon(self.imgAbsPath).getImage().getScaledInstance(130, 130, Image.SCALE_DEFAULT)))
"""The image, before being inserted into the button, is slightly resized, to avoid graphic bumps!"""
I hope I've been helpful.
I am using eclipse and wondering where to put an image so that I can import it into java. I am trying to import an image called viewport.png into JPanel from a folder called pictures that I have placed in my src folder within my workspace. This is what I have tried:
private Image viewport = new ImageIcon("src/images/viewport.png").getImage();
then of course later,
g.drawImage(viewport, 2, 2, null);
I really just want to be able to import a picture from the same folder, as this project is being moved to another computer where it will have a different path, but still be in the same folder. I was wondering if there is a shortcut to finding it that way (just be looking in the same folder as the classes are in).
Access the image via the classpath. You can do it by using getClass().getResource() which returns an URL you can pass the ImageIcon(URL) or ImageIO.read(URL) (which returns an Image. The latter is preferred, as an exception will be thrown is something is wrong with the path
BufferedImage viewPort;
...
try {
viewPort = ImageIO.read(getClass().getResource("/pictures/viewport.png"));
} catch (IOException ex) {
// print some message
}
Your pictures should be in the src
ProjectRoot
src
pictures
viewport.png
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.
I'm trying to display two pictures on my JFrame, the way I found was to use icons and JLabels, this seems pretty straightforward and I'm not having problems with this. But when it comes to locating the image I can't get it to work. I'm on a linux machine thus the forwardslash style. I created a folder called pics in my project which is called 399assig1.
ImageIcon icon1 = createImageIcon("/home/dsk03/ugrad/jeanbern/workspace/C291/workspace/399assig1/pics/fur-05.jpg","First");
this.label1 = new JLabel("Picture 1", icon1, JLabel.CENTER);
ImageIcon icon2 = createImageIcon("pics/fur.png","Second");
this.label2 = new JLabel("Picture 2", icon2, JLabel.CENTER);
this is the error I get
Couldn't find file: /home/dsk03/ugrad/jeanbern/workspace/C291/workspace/399assig1/pics/fur-05.jpg
Couldn't find file: pics/fur.png
if createImageIcon() is searching the CLASSPATH for the file, you'd need to add the root directory to the CLASSPATH. A better approach would be use a path that is relative to a directory that is already included in the CLASSPATH.
Like so:
%>CLASSPATH=$CLASSPATH;/home/dsk03/ugrad/jeanbern/workspace
then your call would be
ImageIcon icon1 = createImageIcon("399assig1/pics/fur-05.jpg", "MyIcon");