java透明按钮的设置

 

JButton透明背景设置

方法1：JButton b1=new JButton();

              b1.setOpaque(false);

              b1.setColor(new Color(2,2,2));  //此颜色值随便设置，只起占位作用，但是必须加上此句，否则不会出现透明背景效果。

              b1..setIcon(new ImageIcon("bin/filechooser/image/rec.gif"));

方法2：JButton b2=new JButton();

              b2.setContentAreaFilled(false);  //只须加上此句

              b2.setIcon(new ImageIcon("bin/filechooser/image/rec.gif"));

END

 

package swing.component;
/*
 * 此程序所用的图片必须是背景透明的
 */
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
/**
 * 这是面板绘制图像的程序
 * @author MyTest
 *
 */

public class TransparencyButton extends JFrame {

 public static void main(String[] args) {
  TransparencyButton frame = new TransparencyButton();
  frame.setBounds(322, 26, 500, 160);
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  frame.setVisible(true);
 }

 public TransparencyButton() {
  setTitle("ImageTest");
  ImagePanel panel = new ImagePanel();
  add(panel);
 }
}

class ImagePanel extends JPanel {
 private Image image = null;
 private JButton b1 = null;

 public ImagePanel() {
  try {
   image = ImageIO.read(new File("swing/component/img/aaa.jpg"));
  } catch (IOException e) {
   e.printStackTrace();
  }
  
  Color c = new Color(0,0,255);//背影颜色随便设任意值,只起占位作用。
  b1 = new JButton();
     ImageIcon icon = new ImageIcon("swing/component/img/r6.gif");//此图标必须是背影透明的
     b1.setOpaque(false);//设置透明背影
     b1.setBackground(c);//必须设置否则不会出现透明背影
  b1.setIcon(icon);
  b1.getIcon();
  add(b1);
 }
 
 public void paintComponent(Graphics g){
  super.paintComponent(g);
  if(image == null)return;
  g.drawImage(image, 0, 0, null);
  
  
 }
}