如何使用图标将JLabel插入另一个JLanel的中心

Question

我有一个Java Swing应用程序.我想插入一个带有png图像的JLabel作为背景,我想在此图像的中心插入另一个JLabel.所以我构建了这段代码:

ImageIcon icon = new ImageIcon(getClass().getResource("/resources/cornometro_white.png"));

labelSfondoTimer = new JLabel(icon);
labelTempoGara = new JLabel();
labelTempoGara.text("pippo");
GridBagConstraints GBC2 = new GridBagConstraints();
Container CR2 = new Container();
GridBagLayout GBL2 = new GridBagLayout();
CR2.setComponentOrientation(ComponentOrientation.UNKNOWN);
CR2.setLayout(GBL2);     
labelSfondoTimer.add(CR2);

GBC2 = new GridBagConstraints();
CR2.add(labelTempoGara);
GBC2.gridx=2;
GBC2.gridy=0;
GBC2.anchor= GridBagConstraints.CENTER;
GBL2.setConstraints(labelTempoGara,GBC2);

使用此代码,我可以在屏幕上看到图像,但我看不到带有文本"pippo"的secondo标签

我也尝试插入此代码:

labelSfondoTimer.setObaque(真); 但不行.

Answer 1

So, how can i fixed my error?- 所以,例如printcreens(基于我在你的问题中的评论 - JLabel hasn't any LayoutManager in API, JLabel has method for centering, JLabel is transparent by default, GBC without any constraints centering JComponent by default)

. .

来自SSCCE/MCVE表格中的代码

import java.awt.EventQueue;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import javax.swing.BorderFactory;
import javax.swing.Icon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
import javax.swing.UIManager;

public class JLabelInJLabel {

    private JFrame frame = new JFrame();
    private Icon errorIcon = UIManager.getIcon("OptionPane.errorIcon");
    private Icon infoIcon = UIManager.getIcon("OptionPane.informationIcon");
    private Icon warnIcon = UIManager.getIcon("OptionPane.warningIcon");
    private JLabel parentJLabel = new JLabel();
    private JLabel childJLabel = new JLabel(infoIcon, SwingConstants.CENTER);
    private JLabel imageInJLabel = new JLabel(errorIcon, SwingConstants.CENTER);
    private JLabel simpleJLabel = new JLabel(warnIcon);

    public JLabelInJLabel() {
        parentJLabel.setLayout(new GridBagLayout());
        parentJLabel.add(childJLabel);
        parentJLabel.setBorder(BorderFactory.createLineBorder(java.awt.Color.RED));        
        imageInJLabel.setBorder(BorderFactory.createLineBorder(java.awt.Color.BLUE));        
        simpleJLabel.setBorder(BorderFactory.createLineBorder(java.awt.Color.ORANGE));        
        frame.setLayout(new GridLayout(0, 1));
        frame.add(parentJLabel);
        frame.add(imageInJLabel);
        frame.add(simpleJLabel);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setLocation(100, 100);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(() -> new JLabelInJLabel());
    }
}