Question

我想使用全屏模式，但是当我按下“F”时我会遇到一个复杂的错误。我正在使用eclipse，它没有显示任何错误，一切都是导入的。如果有人对代码很好，你能告诉我我做错了吗？

代码片段：

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();

我知道这个问题已经过时了，但我自己刚刚解决了这个问题，解决方案对我来说很好。

Answer 2

这是：

if(gd.isFullScreenSupported()){

第165行？如果是，那么gd set是什么？

上述异常为您提供发生错误的类/行号。这应该足以让你知道什么是null。

Answer 3

您需要先将gd初始化为GraphicsEnvironment.getGraphicsEnvironment.getDefaultScreenDevice()，然后才能使用它。

更新：既然OP已经修复了这个问题，还有另外一个问题。问题是更改已显示的窗口上的undecorated属性。如果正在显示窗口，则无法更改undecorated属性，因为操作系统在显示时无法更改属性。我认为可以通过省略对setUndecorated的调用来解决这个问题，全屏窗口不一定要不修饰（我认为）。

Answer 4

在你的代码中添加＆＃34; setUndecorated（true）＆＃34;只要。例如：

public launch() {

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

}

全屏独占模式错误

4 个答案: