因此，在我上一篇文章Java Button Width之后，我希望添加一些图像并设置背景颜色。我尝试了一些东西，只是每次我都这样做。它总是给我错误。
我试过了
setBackground(args);
和
img = addImage("image.png");
他们不为我工作。有人可以帮帮我吗？
好的，我尝试了 Disha 的帖子。而且小程序仍然保持相同的颜色，而不是黑色
问问题
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3 回答
5
一开始，请务必学习Java 命名约定并坚持下去。
为了让您为您的 提供背景颜色JFrame，因为您已经添加了一个JPanel到CENTER. 因此，您无法通过编写获得一种背景颜色：
interfaceFrame.setBackground(Color.black);
现在您必须将 opaque 的属性设置JPanel 为 true 并为相同的设置一种背景颜色：
setOpaque(true);
setBackground(Color.BLUE);
在MenuPane 类的构造函数中。
这是您修改后的代码：
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();
}
}
现在，为了将图像添加到您的项目，您可以查看如何在 Java 中将图像添加到您的项目的答案，您也可以从这个小示例代码中获得帮助，如下所示：
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);
}
}
请取消注释下面给出的行并将您的图像添加到指定位置：
image = ImageIO.read(
getClass().getResource(
"/image/404error.jpg"));
如果仍有疑问，请提出您可能有的任何问题，如果在我的范围内，我会尽力提供信息:-)
于 2012-11-02T13:57:03.983 回答
2
试试这个设置你使用的背景颜色setBackground(Color.color_name);和设置图像试试下面的代码
Image bgImage= Toolkit.getDefaultToolkit().getImage("wallpaper_adrift.jpg");
contentPane.setBackgroundImage(bgImage);
也可以参考http://www.daniweb.com/software-development/java/threads/346524/how-to-set-background-image-in-java-swing 和 How to set an image as background for Frame in java的Swing GUI？
于 2012-11-02T11:27:56.617 回答
1
这是您正在寻找的解决方案：
创建一个名为like的包
com.icon将您的图标添加到该包（复制/粘贴）
您将在按钮上添加图标，如下所示：
button.setIcon(new ImageIcon(NameOfClass.class.getResource("/com/icon/nameOfIcon.png")));
PS 确保它们是 .png 格式。
于 2012-11-02T11:08:16.990 回答