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KeyListener在Java .awt.Window上不起作用

[英]KeyListener doesn't work on java .awt.Window

原文 2011-11-11 12:22:20 3 1 java/ java-me/ cdc

I am using a java.awt.Window for my CDC application. 我正在为CDC应用程序使用java.awt.Window 。 Now I have opted java.awt.Window because, I wanted a non draggable, non resizeable window for my app and frame.setUndecorated() is not available in CDC apis. 现在，我选择了java.awt.Window，因为我希望为我的应用程序提供一个不可拖动的，不可调整大小的窗口，并且frame.setUndecorated()在CDC api中不可用。

Now the problem is any keypress doesn't work on my window. 现在的问题是任何按键都无法在我的窗口上工作。 I have implemented keyListener and override all methods. 我已经实现了keyListener并覆盖了所有方法。 still no clue why it behaves so. 仍然不知道为什么会这样。 :( :(

Note : I am developing this app in J2ME - CDC with Personal profile and not in Java 注意：我正在使用个人配置文件而不是Java在J2ME-CDC中开发此应用程序

1 个解决方案

This problem is solved! 这个问题解决了！ Discovered that KeyListener on a java.awt.Window works only if following conditions are met: 发现只有满足以下条件，才能在java.awt.Window上使用KeyListener：

The owning window/frame of the present Window(which has to handle events) has to be setVisible(true) 当前Window的拥有窗口/框架（必须处理事件）必须设置为Visible（true）
The owning window/frame need to have at least one focusable component. 拥有的窗口/框架需要至少具有一个可聚焦的组件。