如何在Java中创建透明的JFrame背景，但保持按钮可见? [英] How to create background of JFrame transparent in java but keeping buttons visible?

问题描述

我通过以下方式使JFrame透明化:

I am making my JFrame transparent by:

myFrame.setUndecorated(true);
myFrame.setBackground(new Color(1.0f,1.0f,1.0f,0.0f)); 

这使JFrame透明，但也丢失了窗口条和关闭按钮. 为了使窗口看起来可见，我使用了

It makes JFrame transparent but also lost window strip and close button. To make window appear visible I used

AWTUtilities.setOpacity(this, 0.5f);

但是我发现此方法仅适用于Java 6并打包在Java 7中受限的AWT程序包中，并且该方法也在Java 7(现在为

but I found that this method is only available for java 6 and packaged in AWT package which is restricted in java 7. and the method is also changed in java 7 which is now

Window.setOpacity(float opacity);

但是它不起作用，谁能告诉我如何使透明窗口和按钮以及透明框架可见.

but it does not working, Can anyone tell me how to make transparent window and buttons visible along with transparent frame.

推荐答案

这会使框架看起来有些不同，但是我认为这是您想要的:

This will make the frame look a bit different, but I think this is what you want:

import java.awt.Color;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;


public class TransparentExample extends JFrame {

    public TransparentExample() {

        super("TransparentExample");

        JPanel panel = new JPanel();
        panel.add(new JButton("Button"));

        setContentPane(panel);
        setBackground(new Color(0, 0, 0, 0));
        setSize(500, 500);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    }

    public static void main(String[] args) {

        JFrame.setDefaultLookAndFeelDecorated(true);

        TransparentExample frame = new TransparentExample();
        frame.setVisible(true);

    }

}

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如果有效，则应如下所示:

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If it works it should look like this:

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