java 如何在Java中激活窗口？
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How to activate window in Java?
提问by AlexR
I would like to activate my Swing application programatically. I mean that I would like to write code that cause the JFrameto be visible and focused (the window header should be highlighted).
I tried to use requestFocus(). It works only if application has at least 2 windows A and B: A is hidden, B is visible. Now if I call A.requestFocus()it becomes active as I want. It does not happen if application has only one window or if both windows are invisible.
我想以编程方式激活我的 Swing 应用程序。我的意思是我想编写使JFrame可见并聚焦的代码（应突出显示窗口标题）。我尝试使用requestFocus(). 仅当应用程序至少有 2 个窗口 A 和 B 时才有效：A 是隐藏的，B 是可见的。现在，如果我调用A.requestFocus()它，它会根据我的需要变得活跃。如果应用程序只有一个窗口或两个窗口都不可见，则不会发生这种情况。
I found 2 workarounds.
我找到了 2 个解决方法。
- use fake transparent undecorated frame that is always on top. This fake window will play role of window B. I did not try to implement it but it seems that it should work.
- call
A.setAlwaysOnTop(true). This brings window A on top of other windows. But it is not in focus yet. Usejava.awt.Robot(mouseMove, mousePress, mouseRelease) to make a click on the header of window A. Now callA.setAlwaysOnTop(false)and return mouse pointer back to its previous position. I implemented the code and it works but it looks like an ugly workaround.
- 使用始终在顶部的假透明未装饰框架。这个假窗口将扮演窗口 B 的角色。我没有尝试实现它，但它似乎应该可以工作。
- 打电话
A.setAlwaysOnTop(true)。这会将窗口 A 置于其他窗口之上。但目前还不是重点。使用java.awt.Robot(mouseMove, mousePress, mouseRelease) 单击窗口 A 的标题。现在调用A.setAlwaysOnTop(false)并将鼠标指针返回到其先前的位置。我实现了代码并且它有效，但它看起来像一个丑陋的解决方法。
Is there a "right" solution?
有“正确”的解决方案吗？
回答by Brad Mace
frame.setState(Frame.NORMAL); // restores minimized windows
frame.toFront(); // brings to front without needing to setAlwaysOnTop
frame.requestFocus();
for everything you could want to know in excruciating detail, see this page: http://www.developer.com/java/other/article.php/3502181/Window-Focus-and-State-in-Java.htm
对于您可能想知道的所有细节，请参阅此页面：http: //www.developer.com/java/other/article.php/3502181/Window-Focus-and-State-in-Java.htm
回答by user3654656
I was in the same boat - none of the above worked.
我在同一条船上 - 以上都没有奏效。
"MY" solution was follows:
“我的”解决方案如下：
thisFrame.getWindowListeners()[0].windowActivated(
new WindowEvent(
thisFrame,
WindowEvent.WINDOW_ACTIVATED
)
);
schedulesTable.requestFocus();
thisFrame = the window to get activated
schedulesTable = my component in the window I wanted to get focus for
回答by Dmitriy Potapov
I've found out this solvation of the problem:
我发现了这个问题的解决方案：
//frame - JFrame
frame.setExtendedState(JFrame.ICONIFIED);
frame.setExtendedState(JFrame.NORMAL);
frame.toFront();
frame.requestFocus();
On my configuration (win 7, java 12) - it works alright and stably
在我的配置上（win 7，java 12） - 它运行良好且稳定
回答by Michael Goldshteyn
This should do it:
这应该这样做：
frame.setSelected(true);
and you probably want it inside a try/catch block...
你可能想把它放在一个 try/catch 块中......
If that doesn't work on the OS you're using, there are two more possibilities:
如果这在您使用的操作系统上不起作用，还有两种可能性：
frame.setAlwaysOnTop(true);
frame.setAlwaysOnTop(false);
and
和
frame.setVisible(true);
frame.setVisible(true); // Yes you need this second one
