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,但我看不到带有文字“pippo”的secondo标签
我还尝试插入此代码:
labelSfondoTimer.setObaque(真); 但不起作用。
答案 0 :(得分:5)
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表单中的代码
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());
}
}
答案 1 :(得分:3)
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
您可以在同一标签上放置文字和图标:
JLabel label1 = new JLabel( new ImageIcon(...) );
label1.setText( "Centered Text" );
label1.setHorizontalTextPosition(JLabel.CENTER);
label1.setVerticalTextPosition(JLabel.CENTER);
文本将以图像为中心。
您还可以查看此帖子:JButton settext specific position,其中包含其他方法,可以更灵活地处理文本位置。