Question

Java新手在这里...... 我正在尝试将图像添加到我的JFrame的背景中。我已经在面板上添加了按钮，在那个JFrame上。当我将图像添加到JFrame时，我的按钮消失了。

公共类BackPanel扩展了JFrame {

JFrame frame = new JFrame("Blackjack Game");

ImageIcon background;
JLabel backgroundLbl;

JButton newRoundButton;
JButton endButton;

ImageIcon image;

public BackPanel(GameConsole game){

    final GameConsole game1 = game;
    frame.setSize(800, 600);
  //frame.setLayout(new FlowLayout());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);   

  //frame.setContentPane(new JLabel(new ImageIcon(getClass().getResource("cardBackground.jpg"))));
    ImagePanel panel = new ImagePanel("cardBackground.jpg");
    panel.setPreferredSize(new Dimension(800, 600));



    //put frame in the middle of the screen
    Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
    frame.setLocation(dim.width/2-frame.getSize().width/2, dim.height/2-frame.getSize().height/2);


    //create 2 buttons on the panel

    panel.add(endButton);
    panel.add(newRoundButton);
    frame.getContentPane().add(panel, BorderLayout.CENTER);   //add the panel to the frame

//  frame.pack();
    frame.setVisible(true);
    }
}

我觉得它与布局有关，但是当我使用其他布局时，它似乎没有帮助，或者它也会使图像消失。

我已经更改了＆＃34; cardBackground.jpg＆＃34;到＆＃34;＆＃34;以便查看按钮是否以某种方式位于图像下方。他们不是。

我试图加宽框架以查看按钮是否在图像旁边，但它们不是。（无论如何它都没有意义，因为它们不在同一个面板上）。

我对此缺少什么？

编辑：更新了无效的代码：显示按钮但没有背景图像。

import java.awt.Dimension;
import java.io.IOException;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;


public class BackPanel{

    public BackPanel(GameConsole game){
        final GameConsole game1 = game;

        JFrame frame = new JFrame("Blackjack Game");
        ImagePanel panel = new ImagePanel("cardBackground.jpg");
        panel.setPreferredSize(new Dimension(800, 600));


        //create 2 buttons on the panel
        JButton newRoundButton= new JButton("Start another round");
        newRoundButton.setPreferredSize(new Dimension(150, 50));
        newRoundButton.addActionListener(new ActionListener(){

            @Override
            public void actionPerformed(ActionEvent e) {
                game1.userTurn();
            }
        });

        JButton endButton = new JButton("End Game");
        endButton.setPreferredSize(new Dimension(150, 50));
        endButton.addActionListener(new ActionListener(){

            @Override
            public void actionPerformed(ActionEvent e) {
                JOptionPane.showMessageDialog(null, "You have chosen to quit.\n"
                        + "Thank you for playing Blackjack.");
                System.exit(0);
            }
        });

        panel.add(endButton);
        panel.add(newRoundButton);

        frame.add(panel);
        frame.setSize(800, 600);

        frame.setLocationRelativeTo(null);


        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);   
        frame.setVisible(true);
        }
    }

Answer 1

不是添加这样的图像背景，而是创建一个新的JPanel类，它具有重载的paintComponent（）函数，您可以在其中绘制图像。以下是一个示例解决方案的链接：

Adding an Image to a JPanel Background

快乐的编码！

修改

我在Eclipse中掀起了一个例子，一切都很适合我。这是我使用的代码：

import java.awt.Dimension; import java.io.IOException; import javax.swing.JButton; import javax.swing.JFrame; public class Test { public static void main(String[] args) throws IOException { JFrame myFrame = new JFrame(); //Make a background panel ImagePanel panel = new ImagePanel("back.jpg"); panel.setPreferredSize(new Dimension(800, 600)); //Make buttons JButton button1 = new JButton("Button 1"); JButton button2 = new JButton("Button 2"); //Add components panel.add(button1); panel.add(button2); myFrame.add(panel); //Set window size myFrame.setSize(800, 600); //Center it myFrame.setLocationRelativeTo(null); //Make it close normally myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Make it visible (finalization) myFrame.setVisible(true); } }

以下是之前的ImagePanel代码：

import java.awt.Graphics; import java.awt.Image; import javax.swing.ImageIcon; import javax.swing.JPanel; public class ImagePanel extends JPanel { private Image image = null; public ImagePanel(String filename) { this.image = new ImageIcon(filename).getImage(); } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); g.drawImage(image, 0, 0, image.getWidth(null), image.getHeight(null), null); } }

以下是结果： http://postimg.org/image/93k3j5f43/

JFrame添加背景图像后，JPanel / JButtons消失

1 个答案: