问一个怎么监听全屏幕的问题

Question

我想写一个小程序，就是鼠标移动到屏幕任何一点，就显示该点的RGB值。
程序是写完了，但只能在程序的当前窗口中使用，移出去了就没用了。
其他界面代码就略了，请帮我看看下面的代码怎么改好。
private void formMouseMoved(java.awt.event.MouseEvent evt) 
        try {
            java.awt.Robot r=new java.awt.Robot();
            String s=r.getPixelColor((int)evt.getX(),(int)evt.getY()).toString();
            
            jLabel1.setText(s);
        } catch (AWTException ex) {
            ex.printStackTrace();
        }
    }

Answer 1

我以前写的 你看看吧  初学者 哪里写的不对的还请指教 呵呵。import java.awt.*;import javax.swing.*;
import java.awt.Rectangle;
import java.awt.event.MouseEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BorderFactory;
import java.awt.event.MouseMotionAdapter;public class Frame1 extends JFrame {
    JPanel contentPane;
    Robot bot=null;
    JTextField txtred = new JTextField();
    JTextField txtblue = new JTextField();
    JTextField txtgreen = new JTextField();
    JLabel jLabel1 = new JLabel();
    JLabel jLabel2 = new JLabel();
    JLabel jLabel3 = new JLabel();
    int screenwidth=0;
    public Frame1() {
        try {
            setDefaultCloseOperation(EXIT_ON_CLOSE);
            jbInit();
        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }    /**
     * Component initialization.
     *
     * @throws java.lang.Exception
     */    private void jbInit() throws Exception {
        contentPane = (JPanel) getContentPane();
        contentPane.setLayout(null);
        this.setDefaultCloseOperation(this.EXIT_ON_CLOSE);
        this.setResizable(false);
        setSize(new Dimension(229, 114));
        setTitle("得到RGB值");
        screenwidth=(int)Toolkit.getDefaultToolkit().getScreenSize().getWidth();
        this.setLocation(0,0);        try {
            bot=new Robot();
        } catch (Exception ex) {
            System.out.println(ex);
        }
        txtred.setBorder(BorderFactory.createEtchedBorder());
        txtred.setBounds(new Rectangle(58, 8, 157, 18));
        txtblue.setBorder(BorderFactory.createEtchedBorder());
        txtblue.setBounds(new Rectangle(58, 36, 157, 18));
        txtgreen.setBorder(BorderFactory.createEtchedBorder());
        txtgreen.setBounds(new Rectangle(58, 66, 157, 18));
        jLabel1.setText("红");
        jLabel1.setBounds(new Rectangle(15, 1, 20, 30));
        jLabel2.setText("蓝");
        jLabel2.setBounds(new Rectangle(15, 29, 17, 31));
        jLabel3.setText("绿");
        jLabel3.setBounds(new Rectangle(15, 49, 14, 41));
        contentPane.addMouseMotionListener(new
                Frame1_contentPane_mouseMotionAdapter(this));
        contentPane.add(jLabel3);
        contentPane.add(jLabel2);
        contentPane.add(txtred);
        contentPane.add(txtblue);
        contentPane.add(txtgreen);
        contentPane.add(jLabel1);
        this.setVisible(true);        new xiancheng(this);
        this.setAlwaysOnTop(true);    }    public static void main(String[] args)
    {
        Frame1 bb=new Frame1();    }
    class xiancheng extends Thread{        public xiancheng(Frame1 aa)
        {
            super("xiancheng");            this.start();
        }        public void run()
        {
            try {
                while (true) {
                    int x = (int) MouseInfo.getPointerInfo().getLocation().getX();
                    int y = (int) MouseInfo.getPointerInfo().getLocation().getY();
                    Color color = bot.getPixelColor(x, y);
                    txtred.setText("" + color.getRed());
                    txtblue.setText("" + color.getBlue());
                    txtgreen.setText("" + color.getGreen());                    this.sleep(10);
                }
            } catch (InterruptedException ex) {
            } catch (HeadlessException ex) {
            }
        }
    }    int i=0;
    public void contentPane_mouseMoved(MouseEvent e) {
        if (i%2==0)
        {
        this.setLocation(screenwidth-this.getWidth(),0);
        i++;
        }else
        {
            this.setLocation(0,0);
            i++;
        }
    }
}
class Frame1_contentPane_mouseMotionAdapter extends MouseMotionAdapter {
    private Frame1 adaptee;
    Frame1_contentPane_mouseMotionAdapter(Frame1 adaptee) {
        this.adaptee = adaptee;
    }    public void mouseMoved(MouseEvent e) {
        adaptee.contentPane_mouseMoved(e);
    }
}