Swing-将图像添加到GUI

Question

So, following from my last post Java Button Width im looking to add some images and set a background color. Ive tried a few things, just everytime i do it. It always gives me errors.

i've tried

setBackground(args);

and

img = addImage("image.png");

they dont work for me. Can somebody give me a hand please?

Ok i tried the post made by Disha. And the applet still stays the same color, not black

http://pastebin.com/iijj7fSr

Answer 1

At the beginning, Please do learn Java Naming Conventions and stick to them.

In order for you to provide a background Color to your JFrame , since you had added one JPanel to the CENTER . Hence you cannot get one background color by writing :

interfaceFrame.setBackground(Color.black);

Now you have to set the opaque property of the JPanel to true and set one Background color for the same like :

setOpaque(true);
setBackground(Color.BLUE);

inside your MenuPane Class's constructor.

Here here is your modified code :

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Gmine {
        JFrame interfaceFrame;
        JButton singleplayerButton, multiplayerButton, optionsButton, quitButton;


        public Gmine() {
            EventQueue.invokeLater(new Runnable() {
                @Override
                public void run() {
                    try {
                        UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                    } catch (ClassNotFoundException ex) {
                    } catch (InstantiationException ex) {
                    } catch (IllegalAccessException ex) {
                    } catch (UnsupportedLookAndFeelException ex) {
                    }

                    interfaceFrame = new JFrame("G-Mine");
                    interfaceFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                    interfaceFrame.setLayout(new BorderLayout());
                    interfaceFrame.setSize(800,500);
                    //interfaceFrame.setBackground(Color.black);
                    interfaceFrame.add(new MenuPane());
                    interfaceFrame.setLocationRelativeTo(null);
                    interfaceFrame.setVisible(true);
                }
            });
        }

        public class MenuPane extends JPanel {

            public MenuPane() {
                setLayout(new GridBagLayout());

                setOpaque(true);
                setBackground(Color.BLUE);

                singleplayerButton = new JButton("SinglePLayer");
                multiplayerButton = new JButton("MultiPlayer");
                optionsButton = new JButton("Options");
                quitButton = new JButton("Quit");

                GridBagConstraints gbc = new GridBagConstraints();
                gbc.gridx = 0;
                gbc.gridy = 0;
                gbc.fill = GridBagConstraints.HORIZONTAL;
                gbc.ipadx = 20;
                gbc.ipady = 20;

                add(singleplayerButton, gbc);
                gbc.gridy++;
                add(multiplayerButton, gbc);
                gbc.gridy++;
                add(optionsButton, gbc);
                gbc.gridy++;
                add(quitButton, gbc);
            }
        }
        public static void main(String[] args) {
            new Gmine();
        }
}

Now in order to add images to your project you can either see this answer for how to add images to your Project in Java and you can get help from this small sample code as well which is as follows :

import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.*;

public class PaintingExample
{
    private CustomPanel contentPane;
    private JTextField userField;
    private JPasswordField passField;
    private JButton loginButton;

    private void displayGUI()
    {
        JFrame frame = new JFrame("Painting Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        contentPane = new CustomPanel();        

        frame.setContentPane(contentPane);
        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

    public static void main(String... args)
    {
        SwingUtilities.invokeLater(new Runnable()
        {
            public void run()
            {
                new PaintingExample().displayGUI();
            }
        });
    }
}

class CustomPanel extends JPanel
{
    private BufferedImage image;

    public CustomPanel()
    {
        setOpaque(true);
        setBorder(BorderFactory.createLineBorder(Color.BLACK, 5));
        try
        {
            /*
             * Since Images are Application Resources,
             * it's always best to access them in the
             * form of a URL, instead of File, as you are doing.
             * Uncomment this below line and watch this answer
             * of mine, as to HOW TO ADD IMAGES TO THE PROJECT
             * https://stackoverflow.com/a/9866659/1057230
             * In order to access images with getClass().getResource(path)
             * here your Directory structure has to be like this
             *                 Project
             *                    |
             *         ------------------------
             *         |                      |
             *        bin                    src
             *         |                      |
             *     ---------             .java files             
             *     |       |                   
             *  package   image(folder)
             *  ( or              |
             *   .class        404error.jpg
             *   files, if
             *   no package
             *   exists.)
             */
            //image = ImageIO.read(
            //      getClass().getResource(
            //              "/image/404error.jpg"));
            image = ImageIO.read(new URL(
                        "http://gagandeepbali.uk.to/" + 
                                "gaganisonline/images/404error.jpg"));
        }
        catch(IOException ioe)
        {
            System.out.println("Unable to fetch image.");
            ioe.printStackTrace();
        }
    }

    /*
     * Make this one customary habbit,
     * of overriding this method, when
     * you extends a JPanel/JComponent,
     * to define it's Preferred Size.
     * Now in this case we want it to be 
     * as big as the Image itself.
     */
    @Override
    public Dimension getPreferredSize()
    {
        return (new Dimension(image.getWidth(), image.getHeight()));
    }

    /*
     * This is where the actual Painting
     * Code for the JPanel/JComponent
     * goes. Here we will draw the image.
     * Here the first line super.paintComponent(...),
     * means we want the JPanel to be drawn the usual 
     * Java way first, then later on we will
     * add our image to it, by writing the other line,
     * g.drawImage(...).
     */
    @Override
    protected void paintComponent(Graphics g)
    {
        super.paintComponent(g);
        g.drawImage(image, 0, 0, this);
    }
}

Do uncomment the lines given below and add your image at the specified location :

image = ImageIO.read(
      getClass().getResource(
              "/image/404error.jpg")); 

If still in doubt, ask any question you might have, I'll try to provide information, if it is within my bounds :-)

Answer 2

Try this for set background color you use setBackground(Color.color_name); and for set image try below code

Image bgImage= Toolkit.getDefaultToolkit().getImage("wallpaper_adrift.jpg");
contentPane.setBackgroundImage(bgImage);

Also refers to http://www.daniweb.com/software-development/java/threads/346524/how-to-set-background-image-in-java-swing and How to set an image as a background for Frame in Swing GUI of java?

Answer 3

This is solution you are looking for:

1. Create a package called like com.icon

2. Add your icons to that package (copy/paste)

3. You will add icon on button like this:

    button.setIcon(new ImageIcon(NameOfClass.class.getResource("/com/icon/nameOfIcon.png"))); 

PS Make sure they are in .png format.