I'm trying to make a game in Java, and I decided to use GIFs as animations in a JFrame. However, the program keeps showing past frames of the GIF, so the whole image looks like a mess.
This is what the GIF should look like in the program:
However, the GIF ends up looking like this (this is a screenshot of what appears on the JFrame):
And here is my code so far. I'm using NetBeans with Java 8.0.2.
package giftest;
public class MainWindow extends javax.swing.JFrame {
public MainWindow() {
initComponents();
}
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jLabel1 = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setIcon(new javax.swing.ImageIcon(getClass().getResource("/giftest/Chespin2.gif"))); // NOI18N
jLabel1.setText("jLabel1");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(158, 158, 158)
.addComponent(jLabel1)
.addContainerGap(12, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(89, 89, 89)
.addComponent(jLabel1)
.addContainerGap(19, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new MainWindow().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JLabel jLabel1;
// End of variables declaration
}
// End of Program
The effect can be reproduced with these lines of code:
import javax.swing.*;
import java.net.*;
public class AnimatedGifTest {
AnimatedGifTest() throws MalformedURLException {
URL url = new URL(
"https://i.stack.imgur.com/y9O4G.gif");
ImageIcon ii = new ImageIcon(url);
JOptionPane.showMessageDialog(null, ii);
}
public static void main(String[] args) {
Runnable r = () -> {
try {
new AnimatedGifTest();
} catch (MalformedURLException ex) {
ex.printStackTrace();
}
};
SwingUtilities.invokeLater(r);
}
}
I'm using Java Swing, and I'm using jLabels and putting the GIF as the icon. Is there a way to fix this issue in NetBeans on Java 8.0.2? Thanks in advance!
Related
I want to display an image from the web to a panel in another JFrame at the click of a button. Whenever I click the button, first the image loads; and during this time, the current form potentially freezes. Once the image has loaded, the form is displayed with the image. How can I avoid the situation where my form freezes since it is very irritating. Among my codes:
My current class:
private void btn_TrackbusActionPerformed(java.awt.event.ActionEvent evt) {
try {
sendMessage("Query,map,$,start,211,Arsenal,!");
System.out.println(receiveMessage());
} catch (UnknownHostException ex) {
Logger.getLogger(client_Trackbus.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(client_Trackbus.class.getName()).log(Level.SEVERE, null, ex);
}
catch (Exception ex) {
Logger.getLogger(client_Trackbus.class.getName()).log(Level.SEVERE, null, ex);
}
client_trackedbus nextform=new client_trackedbus(planform,connection,packet_receive,packet_send);
this.setVisible(false);
this.dispose();
nextform.setVisible(true);
// TODO add your handling code here:
}
My next class that displays the image:
public class client_trackedbus extends javax.swing.JFrame {
client_planform planform=null;
DatagramSocket connection=null;
DatagramPacket packet_receive=null;
DatagramPacket packet_send=null;
JLabel label=null;
/** Creates new form client_trackedbus */
public client_trackedbus(client_planform planform,DatagramSocket connection,DatagramPacket packet_receive,DatagramPacket packet_send) {
initComponents();
this.planform=planform;
this.connection=connection;
this.packet_receive=packet_receive;
this.packet_send=packet_send;
try {
displayMap("http://www.huddletogether.com/projects/lightbox2/images/image-2.jpg", jPanel1, new JLabel());
} catch (MalformedURLException ex) {
Logger.getLogger(client_trackedbus.class.getName()).log(Level.SEVERE, null, ex);
}
}
private void displayMap(String url,JPanel panel,JLabel label) throws MalformedURLException{
URL imageurl=new URL(url);
Image image=(Toolkit.getDefaultToolkit().createImage(imageurl));
ImageIcon icon = new ImageIcon(image);
label.setIcon(icon);
panel.add(label);
// System.out.println(panel.getSize().width);
this.getContentPane().add(panel);
}
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
jLabel1 = new javax.swing.JLabel();
btn_Exit = new javax.swing.JButton();
btn_Plan = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("Public Transport Journey Planner");
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 368, Short.MAX_VALUE)
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 172, Short.MAX_VALUE)
);
jLabel1.setFont(new java.awt.Font("Arial", 1, 18));
jLabel1.setText("Your tracked bus");
btn_Exit.setText("Exit");
btn_Exit.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btn_ExitActionPerformed(evt);
}
});
btn_Plan.setText("Plan journey");
btn_Plan.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btn_PlanActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(104, 104, 104)
.addComponent(jLabel1))
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addGap(65, 65, 65)
.addComponent(btn_Plan)
.addGap(65, 65, 65)
.addComponent(btn_Exit, javax.swing.GroupLayout.PREFERRED_SIZE, 87, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap(20, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(35, 35, 35)
.addComponent(jLabel1)
.addGap(18, 18, 18)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(btn_Exit)
.addComponent(btn_Plan))
.addContainerGap(12, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void btn_ExitActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
Exitform();
}
private void btn_PlanActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
this.setVisible(false);
this.dispose();
this.planform.setVisible(true);
}
private void Exitform(){
this.setVisible(false);
this.dispose();
}
/**
* #param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
// new client_trackedbus().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton btn_Exit;
private javax.swing.JButton btn_Plan;
private javax.swing.JLabel jLabel1;
private javax.swing.JPanel jPanel1;
// End of variables declaration
}
As suggested in the article Concurrency in Swing, your button handler's query may be blocking the event dispatch thread. Using javax.swing.SwingWorker is one approach to loading images in the background, while displaying progress and keeping the GUI thread alive.
Addendum: Here's a sscce that loads the SO logo; it's been updated to handle exceptions and resize the enclosing container to fit the loaded image:
import java.awt.*;
import java.io.IOException;
import java.net.URL;
import java.util.concurrent.ExecutionException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.swing.*;
/**
* #see http://stackoverflow.com/questions/4530659
*/
public final class WorkerTest extends JFrame {
private final JLabel label = new JLabel("Loading...");
public WorkerTest() {
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
label.setHorizontalTextPosition(JLabel.CENTER);
label.setVerticalTextPosition(JLabel.BOTTOM);
this.add(label);
this.pack();
this.setLocationRelativeTo(null);
}
private void start() {
new ImageWorker().execute();
}
public static void main(String args[]) {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
WorkerTest wt = new WorkerTest();
wt.setVisible(true);
wt.start();
}
});
}
class ImageWorker extends SwingWorker<Image, Void> {
private static final String TEST
= "http://cdn.sstatic.net/stackexchange/img/logos/so/so-logo.png";
#Override
protected Image doInBackground() throws IOException {
Image image = ImageIO.read(new URL(TEST));
return image.getScaledInstance(640, -1, Image.SCALE_SMOOTH);
}
#Override
protected void done() {
try {
ImageIcon icon = new ImageIcon(get());
label.setIcon(icon);
label.setText("Done");
WorkerTest.this.pack();
WorkerTest.this.setLocationRelativeTo(null);
} catch (InterruptedException | ExecutionException e) {
e.printStackTrace();
}
}
}
}
public class SSBTest extends javax.swing.JFrame {
/** Creates new form worker1 */
public SSBTest() {
initComponents();
}
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jLabel1 = new javax.swing.JLabel();
jPanel1 = new javax.swing.JPanel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setText("jLabel1");
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGap(0, 348, Short.MAX_VALUE));
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGap(0, 210, Short.MAX_VALUE));
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGroup(layout.createSequentialGroup().addContainerGap(196, Short.MAX_VALUE).addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 182, javax.swing.GroupLayout.PREFERRED_SIZE).addGap(178, 178, 178)).addGroup(layout.createSequentialGroup().addGap(86, 86, 86).addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE).addContainerGap(122, Short.MAX_VALUE)));
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup().addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE).addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 40, Short.MAX_VALUE).addComponent(jLabel1).addGap(36, 36, 36)));
pack();
}// </editor-fold>
/**
* #param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
final SSBTest ssbTest = new SSBTest();
ssbTest.setVisible(true);
ssbTest.execute();
}
});
}
private void execute() {
(new MeaningOfLifeFinder(jLabel1, jPanel1)).execute();
}
// Variables declaration - do not modify
private javax.swing.JLabel jLabel1;
private javax.swing.JPanel jPanel1;
// End of variables declaration
}
class MeaningOfLifeFinder extends SwingWorker<Icon, Object> {
JLabel label = null;
JPanel panel;
MeaningOfLifeFinder(JLabel label, JPanel jpanel) {
this.label = label;
this.panel = jpanel;
}
protected Icon doInBackground() throws IOException {
URL imageurl;
Image image = null;
System.out.println("image loading");
imageurl = new URL("http://maps.google.com/maps/api/staticmap"
+ "?zoom=14&size=512x512&maptype=roadmap"
+ "&markers=color:green|label:21|-15.0,-150.0&sensor=false");
//image = (Toolkit.getDefaultToolkit().createImage(imageurl));
image = ImageIO.read(imageurl);
ImageIcon icon = new ImageIcon(image);
System.out.println("image loaded...");
return icon;
}
#Override
protected void done() {
try {
System.out.println("image adding to label...");
label.setIcon(get());
//panel.add(label);
System.out.println("image loaded to label...");
} catch (Exception ignore) {
}
}
// System.out.println(panel.getSize().width);
}
I made a simple GUI using Swing and everything is just working fine but the JLabel isn't updating when I used the .setText method. I'm really getting confused about the problem as the JLabel should work properly.
// Variables declaration
private javax.swing.JDesktopPane jDesktopPane1;
private javax.swing.JLabel jLabel1;
public NewClass() {
initComponents();
}
private void initComponents() {
jDesktopPane1 = new javax.swing.JDesktopPane();
jLabel1 = new javax.swing.JLabel();
jLabel1.setText("Hello JLabel!");
jDesktopPane1.add(jLabel1, javax.swing.JLayeredPane.DEFAULT_LAYER);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jDesktopPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 564, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jDesktopPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 388, Short.MAX_VALUE)
);
pack();
}
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new NewClass().setVisible(true);
new NewClass().start();
}
});
}
private void start() {
this.jLabel1.setText("Hello!");
}
new NewClass().setVisible(true);
new NewClass().start();
You have created two instances of the NewClass class.
You only want one instance, then you can set the text for the label on the visible frame:
NewClass frame = new NewClass();
frame.setVisible(true);
frame.start();
If you want to change a property of any Object, then you need a reference to the Object. You can't just keep using the "new" statement.
I don't exactly understand what you are trying to do but if you are trying to update the jLabelText at the start of execution try this
public NewClass() {
initComponents();
this.setVisible(true);
jLabel1.setText("YourText");
}
I need help in the running of the following Java program.
I want the main program to pause running after it displays a new JFrame form and resume after the new window is closed ( or Next button is clicked ) .
So The 10 Forms should come sequentially after I press the next button not altogether at once!
MainClass.java
public class MainClass {
void Run()
{
for(int i=0;i<10;i++)
new NewForm().setVisible(true);
}
public static void main (String[] args)
{
new MainClass().Run();
}
}
NewForm.java
public class NewForm extends javax.swing.JFrame {
public NewForm() {
initComponents();
}
#SuppressWarnings("unchecked")
private void initComponents() {
jButton1 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
jButton1.setText("Next");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(155, 155, 155)
.addComponent(jButton1)
.addContainerGap(190, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(131, 131, 131)
.addComponent(jButton1)
.addContainerGap(146, Short.MAX_VALUE))
);
pack();
}
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new NewForm().setVisible(true);
}
});
}
private javax.swing.JButton jButton1;
}
Setting jframe visible will not wait until the jframe is closed, thats why 10 jframes pops at you. You need to display just one, then add a ActionLisetener to your button. In this action, you just close your panel and open onother one. Of coursce you will need some global counter, consider making i static for start.
I am new to Java. With this class I can open a pdf file:
public class ViewPdf {
public static void main(String[] args) throws Exception {
Process p =
Runtime.getRuntime()
.exec("rundll32 url.dll,FileProtocolHandler c:/pdf/mypdf.pdf");
p.waitFor();
System.out.println("Done.");
}
}
Now a want to use a Jbutton mouse event to fire this class and open that pdf. I'm working in Netbeans can someone give me some help?
NewJFrame.java
public class NewJFrame extends javax.swing.JFrame {
/** Creates new form NewJFrame */
public NewJFrame() {
initComponents();
}
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jButton1 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jButton1.setText("jButton1");
jButton1.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jButton1MouseClicked(evt);
}
});
javax.swing.GroupLayout layout =
new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING,
layout.createSequentialGroup()
.addContainerGap(217, Short.MAX_VALUE)
.addComponent(jButton1)
.addGap(108, 108, 108))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(67, 67, 67)
.addComponent(jButton1)
.addContainerGap(210, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void jButton1MouseClicked(java.awt.event.MouseEvent evt) {
// TODO add your handling code here:
}
/**
* #param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new NewJFrame().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
// End of variables declaration
}
Thanks in advance...^^
As an alternative, you may be able to use open() in your button handler.
The place where you have
// TODO add your handling code here:
You can simply add your code to execute the PDF open
Process p = Runtime.getRuntime().exec("rundll32 url.dll,FileProtocolHandler c:/pdf/mypdf.pdf"); p.waitFor(); System.out.println("Done.");
I want to display an image from the web to a panel in another JFrame at the click of a button. Whenever I click the button, first the image loads; and during this time, the current form potentially freezes. Once the image has loaded, the form is displayed with the image. How can I avoid the situation where my form freezes since it is very irritating. Among my codes:
My current class:
private void btn_TrackbusActionPerformed(java.awt.event.ActionEvent evt) {
try {
sendMessage("Query,map,$,start,211,Arsenal,!");
System.out.println(receiveMessage());
} catch (UnknownHostException ex) {
Logger.getLogger(client_Trackbus.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(client_Trackbus.class.getName()).log(Level.SEVERE, null, ex);
}
catch (Exception ex) {
Logger.getLogger(client_Trackbus.class.getName()).log(Level.SEVERE, null, ex);
}
client_trackedbus nextform=new client_trackedbus(planform,connection,packet_receive,packet_send);
this.setVisible(false);
this.dispose();
nextform.setVisible(true);
// TODO add your handling code here:
}
My next class that displays the image:
public class client_trackedbus extends javax.swing.JFrame {
client_planform planform=null;
DatagramSocket connection=null;
DatagramPacket packet_receive=null;
DatagramPacket packet_send=null;
JLabel label=null;
/** Creates new form client_trackedbus */
public client_trackedbus(client_planform planform,DatagramSocket connection,DatagramPacket packet_receive,DatagramPacket packet_send) {
initComponents();
this.planform=planform;
this.connection=connection;
this.packet_receive=packet_receive;
this.packet_send=packet_send;
try {
displayMap("http://www.huddletogether.com/projects/lightbox2/images/image-2.jpg", jPanel1, new JLabel());
} catch (MalformedURLException ex) {
Logger.getLogger(client_trackedbus.class.getName()).log(Level.SEVERE, null, ex);
}
}
private void displayMap(String url,JPanel panel,JLabel label) throws MalformedURLException{
URL imageurl=new URL(url);
Image image=(Toolkit.getDefaultToolkit().createImage(imageurl));
ImageIcon icon = new ImageIcon(image);
label.setIcon(icon);
panel.add(label);
// System.out.println(panel.getSize().width);
this.getContentPane().add(panel);
}
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
jLabel1 = new javax.swing.JLabel();
btn_Exit = new javax.swing.JButton();
btn_Plan = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("Public Transport Journey Planner");
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 368, Short.MAX_VALUE)
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 172, Short.MAX_VALUE)
);
jLabel1.setFont(new java.awt.Font("Arial", 1, 18));
jLabel1.setText("Your tracked bus");
btn_Exit.setText("Exit");
btn_Exit.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btn_ExitActionPerformed(evt);
}
});
btn_Plan.setText("Plan journey");
btn_Plan.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btn_PlanActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(104, 104, 104)
.addComponent(jLabel1))
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addGap(65, 65, 65)
.addComponent(btn_Plan)
.addGap(65, 65, 65)
.addComponent(btn_Exit, javax.swing.GroupLayout.PREFERRED_SIZE, 87, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap(20, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(35, 35, 35)
.addComponent(jLabel1)
.addGap(18, 18, 18)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(btn_Exit)
.addComponent(btn_Plan))
.addContainerGap(12, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void btn_ExitActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
Exitform();
}
private void btn_PlanActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
this.setVisible(false);
this.dispose();
this.planform.setVisible(true);
}
private void Exitform(){
this.setVisible(false);
this.dispose();
}
/**
* #param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
// new client_trackedbus().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton btn_Exit;
private javax.swing.JButton btn_Plan;
private javax.swing.JLabel jLabel1;
private javax.swing.JPanel jPanel1;
// End of variables declaration
}
As suggested in the article Concurrency in Swing, your button handler's query may be blocking the event dispatch thread. Using javax.swing.SwingWorker is one approach to loading images in the background, while displaying progress and keeping the GUI thread alive.
Addendum: Here's a sscce that loads the SO logo; it's been updated to handle exceptions and resize the enclosing container to fit the loaded image:
import java.awt.*;
import java.io.IOException;
import java.net.URL;
import java.util.concurrent.ExecutionException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.swing.*;
/**
* #see http://stackoverflow.com/questions/4530659
*/
public final class WorkerTest extends JFrame {
private final JLabel label = new JLabel("Loading...");
public WorkerTest() {
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
label.setHorizontalTextPosition(JLabel.CENTER);
label.setVerticalTextPosition(JLabel.BOTTOM);
this.add(label);
this.pack();
this.setLocationRelativeTo(null);
}
private void start() {
new ImageWorker().execute();
}
public static void main(String args[]) {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
WorkerTest wt = new WorkerTest();
wt.setVisible(true);
wt.start();
}
});
}
class ImageWorker extends SwingWorker<Image, Void> {
private static final String TEST
= "http://cdn.sstatic.net/stackexchange/img/logos/so/so-logo.png";
#Override
protected Image doInBackground() throws IOException {
Image image = ImageIO.read(new URL(TEST));
return image.getScaledInstance(640, -1, Image.SCALE_SMOOTH);
}
#Override
protected void done() {
try {
ImageIcon icon = new ImageIcon(get());
label.setIcon(icon);
label.setText("Done");
WorkerTest.this.pack();
WorkerTest.this.setLocationRelativeTo(null);
} catch (InterruptedException | ExecutionException e) {
e.printStackTrace();
}
}
}
}
public class SSBTest extends javax.swing.JFrame {
/** Creates new form worker1 */
public SSBTest() {
initComponents();
}
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jLabel1 = new javax.swing.JLabel();
jPanel1 = new javax.swing.JPanel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setText("jLabel1");
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGap(0, 348, Short.MAX_VALUE));
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGap(0, 210, Short.MAX_VALUE));
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGroup(layout.createSequentialGroup().addContainerGap(196, Short.MAX_VALUE).addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 182, javax.swing.GroupLayout.PREFERRED_SIZE).addGap(178, 178, 178)).addGroup(layout.createSequentialGroup().addGap(86, 86, 86).addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE).addContainerGap(122, Short.MAX_VALUE)));
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup().addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE).addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 40, Short.MAX_VALUE).addComponent(jLabel1).addGap(36, 36, 36)));
pack();
}// </editor-fold>
/**
* #param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
final SSBTest ssbTest = new SSBTest();
ssbTest.setVisible(true);
ssbTest.execute();
}
});
}
private void execute() {
(new MeaningOfLifeFinder(jLabel1, jPanel1)).execute();
}
// Variables declaration - do not modify
private javax.swing.JLabel jLabel1;
private javax.swing.JPanel jPanel1;
// End of variables declaration
}
class MeaningOfLifeFinder extends SwingWorker<Icon, Object> {
JLabel label = null;
JPanel panel;
MeaningOfLifeFinder(JLabel label, JPanel jpanel) {
this.label = label;
this.panel = jpanel;
}
protected Icon doInBackground() throws IOException {
URL imageurl;
Image image = null;
System.out.println("image loading");
imageurl = new URL("http://maps.google.com/maps/api/staticmap"
+ "?zoom=14&size=512x512&maptype=roadmap"
+ "&markers=color:green|label:21|-15.0,-150.0&sensor=false");
//image = (Toolkit.getDefaultToolkit().createImage(imageurl));
image = ImageIO.read(imageurl);
ImageIcon icon = new ImageIcon(image);
System.out.println("image loaded...");
return icon;
}
#Override
protected void done() {
try {
System.out.println("image adding to label...");
label.setIcon(get());
//panel.add(label);
System.out.println("image loaded to label...");
} catch (Exception ignore) {
}
}
// System.out.println(panel.getSize().width);
}