I copied the path of the image but no icon appears click on the image to see
no icon
I created simple frame and needed to include icon
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;
import java.awt.Color;
public class App {
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setTitle("JFrame title goes here");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //exit out of app
frame.setResizable(false); // prevent frame from being resized
frame.setSize(700,700);
frame.setVisible(true);
try {
URL resource = frame.getClass().getResource("/games.png");
BufferedImage image = ImageIO.read(resource);
frame.setIconImage(image);
} catch (IOException e) {
e.printStackTrace();
}
frame.getContentPane().setBackground(new Color(123,50,250));
}
}
Trying to embed a .mp4 video in a JPanel. JPanel will load and execute but video does not. The try{} throws an error but not sure why the try{} is throwing the error. Copied this code from another source but it will not compile.
import java.awt.BorderLayout;
import java.awt.Component;
import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import javax.media.Manager;
import javax.media.MediaLocator;
import javax.media.Player;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Main extends JPanel
{
public static void main(String[] args)
{
URL mediaUrl=null;
File file = new File("Mortal Combat Video.mp4");
System.out.println(file);
try
{
mediaUrl = file.toURL();
}
catch (MalformedURLException ex)
{
System.out.println(ex);
}
JFrame mediaTest = new JFrame( "Movie Player" );
mediaTest.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
MediaPlayer mediaPanel = new MediaPlayer( mediaUrl );
System.out.println(mediaPanel);
mediaTest.add( mediaPanel );
mediaTest.setSize( 800, 700 ); // set the size of the player
mediaTest.setLocationRelativeTo(null);
mediaTest.setVisible( true );
}
}
import java.awt.BorderLayout;
import java.awt.Component;
import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import javax.media.Manager;
import javax.media.MediaLocator;
import javax.media.Player;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MediaPlayer extends JPanel {
public MediaPlayer(URL mediauUrl) {
setLayout(new BorderLayout());
Player mediaPlayer = null;
Component video = null;
Component control = null;
try
{
mediaPlayer=Manager.createRealizedPlayer(new MediaLocator(mediauUrl));
video=mediaPlayer.getVisualComponent();
control=mediaPlayer.getControlPanelComponent();
System.out.println("here3");
if (video == null)
System.out.println("video");
else
{
System.out.println("video2");
add(video, BorderLayout.CENTER); // place the video component in the panel
}
add(control, BorderLayout.SOUTH); // place the control in panel
mediaPlayer.start();
}
catch (Exception e)
{
System.out.println("error");
}
}
}
The catch{} prints "error" but not sure why the try{} code will not compile. Any advice is appreciated.
Its running now, video plays, controls work but the video itself is not visible (audio plays).
Here's screenshot:
I'm a beginner in Java and I would like to load an image with this script:
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.io.*;
import javax.imageio.*;
import javax.swing.*;
/**
* This class demonstrates how to load an Image from an external file
*/
public class LoadImageApp extends Component {
BufferedImage img;
public void paint(Graphics g) {
g.drawImage(img, 0, 0, null);
}
public LoadImageApp() {
try {
img = ImageIO.read(getClass().getResource("/resources/java.png"));//cannot found image
} catch (IOException e) {
}
}
public Dimension getPreferredSize() {
if (img == null) {
return new Dimension(100,100);
} else {
return new Dimension(img.getWidth(null), img.getHeight(null));
}
}
public static void main(String[] args) {
JFrame f = new JFrame("Load Image Sample");
f.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
f.add(new LoadImageApp());
f.pack();
f.setVisible(true);
}
}
Then I put a picture on a folder resource "resources", change the name of the location of the picture like "/resources/java.png" and when I compile, there is an empty window without image.
You can see error here : https://ibb.co/ysjNyQw
The first thing you're going to want to do is do some research into "embedded resources", for example
I don't use Eclipse, I use Netbeans, but the process should be the same
As you can see, I've placed my image in the resources package within the projects "sources". This will ensure that it's available at runtime via the class path search mechanism (and embedded within the resulting Jar file when I export it).
I then used a JLabel to display it...
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
BufferedImage image = ImageIO.read(getClass().getResource("/resources/java.png"));
JLabel label = new JLabel(new ImageIcon(image));
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(label);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
} catch (IOException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
}
}
});
}
}
Now, if you want to continue using a custom painting route, I suggest having a read of:
Performing Custom Painting
Painting in AWT and Swing
to get a better understanding of how painting works in Swing and how you should work with it
So I created a simple java program(not important) and in eclipse I have a gif file that is the splash screen. When I exported the program into a jar the splash screen came up blank. Any help with this? Thanks in advance. Here is the main class:
package com.ethan.main;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JWindow;
import javax.swing.SwingConstants;
public class SingAlong {
public static void main (String args[]) {
int close = 0;
JWindow window1 = new JWindow();
window1.getContentPane().add(
new JLabel("", new ImageIcon("res/Backgrounds/Final GIF.gif"), SwingConstants.LEFT));
window1.setBounds(0, 100, 300, 200);
window1.setVisible(true);
if(close == 1){
window1.dispose();
}
try {
Thread.sleep(6850);
close = 1;
}
catch (InterruptedException e) {
e.printStackTrace();
}
JFrame window = new JFrame("Science Quiz");
window.setContentPane(new SingAlongMain());
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.setResizable(true);
window.pack();
window.setVisible(true);
}
}
I am trying to change the icon (background) of a JLabel, but I am having an issue with the icon not updating. Whenever I tried lblStatusImg.setIcon(new ImageIcon(Brix_Updater_Module.class.getResource("/resources/fail.png"))); to change the JLabel in the main method, the compiler was first complaining that the variable lblStatusImg did not exist, so I moved it from the JFrame initialization method to a class level variable. After this, Eclipse complained that I was trying to reference a nonstatic method from static context, so I made lblStatusImg static. This made it possible for the program to compile, but the icon did not change whenever it was supposed to.
Since it's kind of hard to understand my problem here is a download link for an Eclipse workspace that demonstrates my problem. When you first open it, you will notice that there are some problems with it. They were left there on purpose to make it easier for you to see where I am having a hard time. If Eclipse asks you to make the items in question static, just do it and then run the program. You'll notice that it does not change the label icons as it should.
Since not all of you have Eclipse, here's the entire code from the workspace.
import java.awt.Component;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JLabel;
import java.awt.Font;
import javax.swing.SwingConstants;
import java.awt.Window.Type;
import java.io.BufferedOutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Timer;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
public class StackOverflow_Image_Resource_Demo {
private JFrame frmUpdate;
JLabel lblStatusImg = new JLabel("");
JButton btnUpdateComplete = new JButton("OK");
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
StackOverflow_Image_Resource_Demo window = new StackOverflow_Image_Resource_Demo();
window.frmUpdate.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
try {
lblStatusImg.setIcon(new ImageIcon(StackOverflow_Image_Resource_Demo.class.getResource("success.png")));
btnUpdateComplete.setVisible(true);
}
catch(Exception e)
{
Component frame = null;
lblStatusImg.setIcon(new ImageIcon(StackOverflow_Image_Resource_Demo.class.getResource("/resources/fail.png")));
JOptionPane.showMessageDialog(frame, "Update Failed", "Update Failed", JOptionPane.ERROR_MESSAGE);
System.exit(1);
}
}
/**
* Create the application.
*/
public StackOverflow_Image_Resource_Demo() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frmUpdate = new JFrame();
frmUpdate.setType(Type.UTILITY);
frmUpdate.setTitle("StackOverflow Image Resource Issue Demo");
frmUpdate.setBounds(100, 100, 450, 300);
frmUpdate.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frmUpdate.getContentPane().setLayout(null);
//JLabel lblStatusImg = new JLabel(""); - Commented out when I made lblStatusImg class level.
lblStatusImg.setIcon(new ImageIcon(StackOverflow_Image_Resource_Demo.class.getResource("/resources/updating.gif")));
lblStatusImg.setBounds(10, 22, 414, 97);
frmUpdate.getContentPane().add(lblStatusImg);
//JButton btnUpdateComplete = new JButton("OK"); - Commented out when I made btnUpdateComplete class level.
btnUpdateComplete.setVisible(false);
btnUpdateComplete.addMouseListener(new MouseAdapter() {
#Override
public void mouseReleased(MouseEvent arg0) {
System.exit(1);
}
});
btnUpdateComplete.setBounds(170, 179, 89, 23);
frmUpdate.getContentPane().add(btnUpdateComplete);
}
}
Here is a newer version of my code that updates the image, but doesn't fully load the UI until everything else is done.
import java.awt.Component;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JLabel;
import java.awt.Font;
import javax.swing.SwingConstants;
import java.awt.Window.Type;
import java.io.BufferedOutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Timer;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
public class StackOverflow_Image_Resource_Demo {
private JFrame frmUpdate;
JLabel lblStatusImg = new JLabel("");
JButton btnUpdateComplete = new JButton("OK");
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
StackOverflow_Image_Resource_Demo window = new StackOverflow_Image_Resource_Demo();
try {
lblStatusImg.setIcon(new ImageIcon(StackOverflow_Image_Resource_Demo.class.getResource("success.png")));
btnUpdateComplete.setVisible(true);
}
catch(Exception e)
{
Component frame = null;
lblStatusImg.setIcon(new ImageIcon(StackOverflow_Image_Resource_Demo.class.getResource("/resources/fail.png")));
JOptionPane.showMessageDialog(frame, "Update Failed", "Update Failed", JOptionPane.ERROR_MESSAGE);
System.exit(1);
}
window.frmUpdate.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public StackOverflow_Image_Resource_Demo() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frmUpdate = new JFrame();
frmUpdate.setType(Type.UTILITY);
frmUpdate.setTitle("StackOverflow Image Resource Issue Demo");
frmUpdate.setBounds(100, 100, 450, 300);
frmUpdate.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frmUpdate.getContentPane().setLayout(null);
//JLabel lblStatusImg = new JLabel(""); - Commented out when I made lblStatusImg class level.
lblStatusImg.setIcon(new ImageIcon(StackOverflow_Image_Resource_Demo.class.getResource("/resources/updating.gif")));
lblStatusImg.setBounds(10, 22, 414, 97);
frmUpdate.getContentPane().add(lblStatusImg);
//JButton btnUpdateComplete = new JButton("OK"); - Commented out when I made btnUpdateComplete class level.
btnUpdateComplete.setVisible(false);
btnUpdateComplete.addMouseListener(new MouseAdapter() {
#Override
public void mouseReleased(MouseEvent arg0) {
System.exit(1);
}
});
btnUpdateComplete.setBounds(170, 179, 89, 23);
frmUpdate.getContentPane().add(btnUpdateComplete);
}
}
Two things come to find. The first is, as you say, you're trying to reference a non-static variable from a static context.
The second is, you don't seem to understand how threading works...
Basically, main is typically executed within the "main" thread (when executed by the JVM).
You then use EventQueue.invokeLater. Which as, the name suggests, will execute the Runnable "later"...at some time in the future...
EventQueue.invokeLater(new Runnable() {
public void run() {
You then try and change the the icon (let's pass over the non-static reference for a momement)...but lblStatusImg won't have been initialized nor is it likely to have been displayed, as the Runnable has not yet been executed, meaning, even if you didn't run into a NullPointerException, you won't see the change...
You can test by adding a System.out in your Runnable and before the first lblStatusImg.setIcon call in the main method.
What you should do is...
Move the "status" change change to within the Runnable context.
Provide a setStatus method that is capable of changing the label and UI content as required based on the provide status
For example...
public static final int SUCCESS = 0;
public static final int FAIL = 0;
//...
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
StackOverflow_Image_Resource_Demo window = new StackOverflow_Image_Resource_Demo();
// This e
window.frmUpdate.setVisible(true);
window.setStatus(StackOverflow_Image_Resource_Demo.SUCCESS);
} catch (Exception e) {
e.printStackTrace();
Component frame = null;
window.setStatus(StackOverflow_Image_Resource_Demo.FAIL);
JOptionPane.showMessageDialog(frame, "Update Failed", "Update Failed", JOptionPane.ERROR_MESSAGE);
window.dispose();
}
}
});
}
You should avoid exposing instance fields as public and instead, provide methods that either change their state indirectly (such as setStatus) or directly (setStatusIcon). In this case, I prefer the first method as this allows the class to determine what a change in status actually means.