全屏独占模式错误

Question

我想使用全屏模式，但是当我按“F”时，我不断收到一个复杂的错误。我正在使用 eclipse，它没有显示任何错误，并且所有内容都已导入。如果有人擅长代码，你能告诉我我做错了什么吗？

一个sn-p的代码：

GraphicsEnviroment ge = GraphicsEnviroment.getLocalGraphicsEnviroment();
GraphicsDevice gd = ge.GetDefaultScreenDevice();
private boolean FullScreen = false;
JFrame frame = new JFrame(TITLE);

// Not shown: The JFrame is set up etc., and a separate class extends KeyAdapter and runs keyPressed

public void keyPressed(KeyEvent e){
    int key = e.getKeyCode();
        if(key == KeyEvent.VK_F){
        if(!FullScreen){
            if(gd.isFullScreenSupported()){
                frame.setUndecorated(true);
                gd.setFullScreenWindow(frame);
                                    FullScreen = true;
            }
        } else{
            frame.setUndecorated(false);
            gd.setFullScreenWindow(null);
        }
    }

错误：

Exception in thread "AWT-EventQueue-0" java.awt.IllegalComponentStateException: The frame is displayable.
at java.awt.Frame.setUndecorated(Frame.java:923)
at com.Ward.src.main.Game.keyPressed(Game.java:167)
at com.Ward.src.main.KeyboardInput.keyPressed(KeyboardInput.java:15)
at java.awt.Component.processKeyEvent(Component.java:6463)
at java.awt.Component.processEvent(Component.java:6282)
at java.awt.Component.dispatchEventImpl(Component.java:4861)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1895)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:762)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:1027)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:899)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:727)
at java.awt.Component.dispatchEventImpl(Component.java:4731)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:694)
at java.awt.EventQueue$3.run(EventQueue.java:692)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:708)
at java.awt.EventQueue$4.run(EventQueue.java:706)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)

Answer 1

frame.dispose(); // Fixes the issue
frame.setUndecorated(true);
frame.setVisible();

我知道这个问题很老，但是我自己处理了这个问题，解决方案对我来说很好。

Answer 2

您需要将gd初始化为GraphicsEnvironment.getGraphicsEnvironment.getDefaultScreenDevice()才能使用它。

更新： 既然 OP 已经解决了这个问题，还有另一个问题。问题是在已经显示的窗口上更改undecorated 属性。如果正在显示窗口，则无法更改undecorated 属性，因为操作系统无法在显示时更改该属性。我认为这可以通过省略对setUndecorated 的调用来解决，全屏窗口不必不装饰（我认为）。

Answer 3

这是：

if(gd.isFullScreenSupported()){

第 165 行？如果是这样，gd set 是什么？

上述异常为您提供了发生错误的类/行号。这应该足以让您了解什么是空的。

Answer 4

仅在您的代码中添加“setUndecorated(true)”。 示例：

public launch() {

    setSize(300, 200);
    setUndecorated(true);

}