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
}
1 Answer