I've been having an issue with displaying images in Java with the ImageIcon class. The code is very simple, but it simply displays a window like
.
import javax.swing.*;
public class TestButtonIcons {
public static void main(String[] args) {
ImageIcon usFlag = new ImageIcon("images/usFlag.png");
JFrame frame = new JFrame();
JButton jbt = new JButton(usFlag);
frame.add(jbt);
frame.setSize(500, 500);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
My image is located under the src folder, and my IDE can also detect it, since it shows
.
Also, if I change the path mentioned above into the full path, like
"/Users/Mac/Documents/Java TB/ImageIcons/src/images/usFlag.png"
The program works normally.
Any help will be appreciated.
Thanks!
ImageIcon(String) assumes that the image is located on the disk somewhere. When you place the image inside the src directory, most IDE's will bundle the image into the resulting Jar (AKA embedded resource), which means that they are no longer a "file" on the disk, but a byte stream in a zip file, so you need to access them differently.
Start by using ImageIO.read, unlike ImageIcon, it will throw an IOException when the image can't be loaded.
You need to use Class#getResource or Class#getResourceAsStream depending on how need to reference it, for example...
BufferedImage image = null;
try {
image = ImageIO.read(getClass().getResource("/images/usFlag.png"));
} catch (IOException ex) {
ex.printStackTrace();
}
Take a look at Reading/Loading an Image for more details
Make sure you use "./path" or else it might think it's an absolute path. "." is the current directory, which indicates a relative path instead of an absolute one.
Problem is in the location of the image. Place your image in source folder. Try like
JButton button = new JButton();
try {
Image img = ImageIO.read(getClass().getResource("images/usFlag.png"));
button.setIcon(new ImageIcon(img));
} catch (IOException ex) {
}
I assume that the image is in src/images.
The path you give to the constructor of ImageIcon is relative to the location of your class.
So if your class is org.example.TestButtonIcons it will look for org/example/images/usFlag.png
Hope this helps.
Related
I'm trying to make an application to manage some drink recipes...
I need to show the drink image in a JPanel already working with the file path like this:
ImageIcon image = new ImageIcon("src/fotos/trinidad.jpg");
The problem is that when I try to set this path setting it with the object name, the image is not being loaded.
String s = ("src/fotos/"+b.getNome().toLowerCase()+".jpg");
ImageIcon image = new ImageIcon(s);
Printing this string s I have this result:
System.out.println(s);
src/fotos/trinidad.jpg
Apparently it looks the same path, but the image is not being loaded.
What am I doing wrong?
Try something like this, if the image (path) does not exist you can catch the exception and treat accordingly.
BufferedImage drinkImage = null;
try {
drinkImage= ImageIO.read(new File("src/fotos/trinidad.jpg"));
} catch (IOException e) {
// TODO
e.printStackTrace();
}
ImageIcon image = new ImageIcon(drinkImage);
// Put image in your JPanel
everybody.
I am novice in Java and making training project with UI.
In process of trainings I decided to load icons from resources and to move its loading in the different class.
And got problem.
I really tried to find answers by myself but could not.Code bellow.
Main class
package scv.paul;
…
/**
* Create the application.
*/
public TestApp() {
Logger.getLogger(loggerName).fine("Showing main window");
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.setTitle("Test App");
**frame.setIconImage( MyImages.appIcn.getImage());**//here try to load icon
And get exception:
Exception in thread "AWT-EventQueue-0" java.lang.ExceptionInInitializerError
Utility class
package scv.paul;*
import javax.swing.ImageIcon;
public class MyImages {
public static final ImageIcon appIcn = new ImageIcon ( MyImages.class.getResource ( "AppIcon.png" ) );
public static final ImageIcon BtnIcn = new ImageIcon ( MyImages.class.getResource ( "OK.png" ) );
public static final ImageIcon exitIcn = new ImageIcon ( MyImages.class.getResource ( "door.png" ) );
}
Images lay in "\bin" folder
I understand that the problem in the initialization of the static fields. But can’t understand reason.
I got this error if I call even such static field
public static final String imgPath = System.getProperties().getProperty("user.dir")+"\\img\\";
But I have no errors if I call in main class this static field
public static final String imgPath = "c://myProjectPath//bin";
And I could not find how to work with resources in good stile. Where I could read it?
Don't use static variables for something like this. There is no need to keep a reference to the icon. Just read the Icon and add it to your button.
Just load the images in the constructor of your class (when you create your buttons). See the section from the Swing tutorial on How to Use Icons for more information and working examples.
The tutorial will also show you how to better structure your code so the Swing components are created on the Event Dispatch Thread.
Keep a link to the tutorial handy for other Swing basics.
Put you images in the directory of the projecet, e.g. where the bin and src folders are located.
Its best to use a static method to read in files aswell incase they fail. Say you your resource folder within the directory called resources, your code would look something like this.
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);
}
And then call this with the file name you want the same way you have done above.
public static ImageIcon image= makeImageIcon("myImage.png");
Hope this helps.
Currently I pass a hardcoded string file location to my object method which uses the string in the .getResources() method to load an image file. I am now trying to chooses an image using a load button and pass the loaded file location as a string into the getResource() method. I am using the filename.getAbsolutePath() method to retrieve the file location then passing the filename variable into the object method however this provides me with the following error -
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException.
The line of code that it points to having the error is the .getResources line where the image is loaded. I will post the code below to better understand my problem.
btnLoad.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
JFileChooser fc = new JFileChooser();
if (fc.showOpenDialog(null) == JFileChooser.APPROVE_OPTION)
{
File loadImage = fc.getSelectedFile();
String filename = loadImage.getAbsolutePath();
filename = filename.replaceAll("\\\\", "\\\\\\\\");
picLocation = filename;
ImageSwing imageSwing = new ImageSwing(filename);
System.out.println(filename);
}
}
The output of the file name is correct yet it still wont pass into the object.
public class ImageSwing extends JFrame
{
public JLabel label;
public ImageSwing(String S){
super("Card Stunt"); //Window Title
setLayout(new FlowLayout()); //lookup grid layout
Icon flag = new ImageIcon(getClass().getResource(S));
label = new JLabel(flag);
label.setToolTipText(S);
setSize(1350, 800);
//setMinimumSize(new Dimension(1200, 760));
}//main
}
It seems like you create an absolute filename with loadImage.getAbsolutePath(), but then you try to use this as a class path resource with new ImageIcon(getClass().getResource(S)).
Instead, you should just pass the absolute filename, as a string, to ImageIcon:
Icon flag = new ImageIcon(S);
Also, don't forget to add the label to the frame...
getContentPane().add(label);
Also, I'm not on Windows right now, but I don't think filename.replaceAll("\\\\", "\\\\\\\\"); is necessary.
I am working by way through a tutorial: http://www.kilobolt.com/day-4-enter-the-robot.html
and have been having a problem getting a simple image to display in the applet. I am using IntelliJ 13 Community Edition. The main for loading the images is here:
It does the image setup in the init method:
public void init() {
setSize(800, 480);
setBackground(Color.BLACK);
setFocusable(true);
addKeyListener(this);
Frame frame = (Frame) this.getParent().getParent();
frame.setTitle("Q-Bot Alpha");
try {
base = getDocumentBase();
} catch (Exception e) {
// TODO: handle exception
}
// Image Setups
character = getImage(base, "data/character.png").toString());
}
where character is a sprite I obtained from the tutorial website. I saved it in a folder called data. The file structure can be seen here:
When I run this I just see a black background and character.png is not displayed. However if I change the getImage line to:
character = getImage(base, new URL("http://www.kilobolt.com/uploads/1/2/5/7/12571940/character.png").toString());
and point at the URL directly it works. I suspect this must be a path issue but I have not been able to get it working.
I am working on the same program and had the same problem. When run, the document base is actually in KiloboltGame/bin so you need to add your data/character.png here.
I have tried several methods to add an Icon to a JFrame. Every method work perfectly when I run it using the source code.
for example:
jframe.setIconImage(Toolkit.getDefaultToolkit().getImage("iconimages/icon.png"));
But none of them work when I run it using the jar file. I know the problem is with the path of the image file. How can I solve this?
Edit:
public Ui() {
initComponents();
setLocationRelativeTo(null);
this.setIconImage(getImageIcon("icon.png").getImage());
}
private ImageIcon getImageIcon(String fileName) {
String imageDirectory = "iconimages/";
imgURL = getClass().getResource(imageDirectory + fileName);
return new ImageIcon(imgURL);
}
I tried this but now I get a null pointer exception.
--------------------------------------------------------------------------------
Edit [Solution] : I found the solution.
I added ../ to the path additionally and it works perfectly!!! :D
ImageIcon imageIcon = new ImageIcon("../imageicons/icon.png");
this.setIconImage(imageIcon.getImage());
Thanks all for try to help me. :)
You should use a URL. Like this:
/**
* Loads and returns an {#link Image} resource.
* #param fileName name of the image resource.
* #return Image as resource.
*/
public Image getResourceImage(String fileName) {
String imageDirectory = "images/";
URL imgURL = getClass().getResource(imageDirectory + fileName);
Image image = null;
try {
image = ImageIO.read(imgURL);
} catch (IOException e) {}
return image;
}