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POProblems in Using JLabel to Display a Chosen Image File
 

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  1. POProblems in Using JLabel to Display a Chosen Image File
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    <p>I encountered a problem while I am trying to display an image after I clicked a button and chose image file within the "Choose File Dialog".</p> <p>Initially, I was managed to display the chosen image in <code>JLabel</code>, but later I created a separate <code>ActionListener</code>, I think it started to go wrong since then. Whatever image I choose, the <code>JLabel</code> won't display it.</p> <p>I debugged it, and sure that the file chooser does pass the image to <code>ImageIcon</code>, <code>JLabel</code> does get the value from <code>ImageIcon</code>, but it doesn't display the image even after <code>revalidate()</code> and <code>repaint()</code>.</p> <p>Here I attached my code for your kind reference!</p> <p>(I trimmed the code for a clean look, so there might be some brackets left not useful)</p> <pre class="lang-java prettyprint-override"><code>package com.xxx.LoyalCardManager; import java.awt.EventQueue; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import java.sql.SQLException; import java.util.ArrayList; import javax.imageio.ImageIO; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JFileChooser; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JSeparator; import javax.swing.JTextField; import javax.swing.filechooser.FileFilter; public class LoyalCardManagerMain implements ActionListener{ private JFrame frame; private DatabaseHandler db = new DatabaseHandler(); private JLabel labelPic; private JButton buttonPic; private File picFile = new File(""); private BufferedImage image; /** * Launch the application. * @throws SQLException * @throws ClassNotFoundException */ public static void main(String[] args) throws SQLException, ClassNotFoundException { EventQueue.invokeLater(new Runnable() { public void run() { try { LoyalCardManagerMain window = new LoyalCardManagerMain(); window.frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } } /** * Create the application. */ public LoyalCardManagerMain() { // Database initialisation initDatabase(); // Draw GUI frame = new JFrame(); frame.setBounds(100, 100, 619, 487); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.getContentPane().setLayout(null); buttonPic = new JButton("Click to Choose Pic"); buttonPic.setBounds(415, 252, 166, 29); frame.getContentPane().add(buttonPic); buttonPic.setEnabled(false); buttonPic.setActionCommand("ChoosePic"); buttonPic.addActionListener(this); labelPic = new JLabel(); labelPic.setBounds(415, 30, 167, 210); frame.getContentPane().add(labelPic); } public void actionPerformed(ActionEvent event) { String command = event.getActionCommand(); if (command.equals("ChoosePic")) { //TODO Label now cannot display images. JFileChooser chooser = new JFileChooser(); chooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES); chooser.setAcceptAllFileFilterUsed(false); chooser.setFileFilter(new FileFilter() { public boolean accept (File f) { String extension = Utils.getExtension(f); if(extension != null) { if (extension.equals(Utils.gif) || extension.equals(Utils.jpeg) || extension.equals(Utils.jpg) || extension.equals(Utils.png) || extension.equals(Utils.tif) || extension.equals(Utils.tiff)) { return true; }else{ return false; } } return false; } public String getDescription() { return "Image File (*.gif, *.jpeg, *.jpg, *.png, *.tif, *.tiff)"; } }); int retVal = chooser.showOpenDialog(frame); if (retVal == JFileChooser.APPROVE_OPTION) { picFile = chooser.getSelectedFile(); try { image = ImageIO.read(picFile); } catch (IOException e) { e.printStackTrace(); } // Calculate the pic's ratio and do re-scale double ratio = (double) labelPic.getWidth() / (double) labelPic.getHeight(); // Do image scale, scaledW is the new Width, and LabelPic.getHeight is the new Height. int scaledW = (int) (image.getHeight() * ratio); image = new BufferedImage(scaledW, labelPic.getHeight(), BufferedImage.SCALE_FAST); ImageIcon icon = new ImageIcon(image); labelPic.setVisible(true); labelPic.setIcon(icon); labelPic.revalidate(); labelPic.repaint(); } } } } </code></pre> <p>I also referenced other similar questions:</p> <p><a href="https://stackoverflow.com/questions/10737029/image-loading-using-a-jfilechooser-into-a-jframe">image loading using a JFileChooser into a JFrame</a></p> <p><a href="https://stackoverflow.com/questions/8883937/image-wont-display-in-jlabel">Image won&#39;t display in JLabel</a></p> <p><a href="https://stackoverflow.com/questions/10051638/updating-an-image-contained-in-a-jlabel-problems">Updating an image contained in a JLabel - problems</a></p> <p>External Site: <a href="http://www.dreamincode.net/forums/topic/253216-jfilechooser-opening-image-to-jlabel/" rel="nofollow noreferrer">JFIleChooser opening image to JLabel</a></p> <p>As well as Java Tutorial Docs <a href="http://docs.oracle.com/javase/tutorial/uiswing/components/button.html" rel="nofollow noreferrer">How to Use Buttons, Check Boxes, and Radio Buttons</a></p> <p>But I still can't figure it out why the JLabel not display the chosen image.</p> <p>Thanks for your kind help mates!</p>
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    1. COIf it is possible try to create [SSCCE](http://sscce.org/) that will reproduce your problem (remove db usage for example)
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    2. CO@Pshemo OK no problem, I'm starting to get rid off those irrelevant parts.
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