从Java发送键盘事件到任何应用程序（屏幕键盘） [英] Sending a keyboard event from java to any application (on-screen-keyboard)

问题描述

我正在使用java开发一个屏幕键盘。这个键盘每个可能的键都有一个 JComponent 。当在按钮上检测到鼠标向下时，我想将特定的键盘代码发送到当前焦点的应用程序。键盘本身在一个 JFrame 中，没有装饰，并设置为永远在上。

我发现机器人类可用于模拟本机队列上的这些键盘事件。但是，在这种情况下，选择 JComponent 将意味着在 JFrame 上收到了按键，将无法在其他应用程序中收到它

如何保持屏幕键盘始终无焦点？是否可能使用其他方法发送按键？

解决方案

显然，这样做的唯一方法是拥有一个JNI层，将从java转换为本机。 Java没有提供这种功能的简单方法。

对于想要学习JNI的人来说，这可能是一个有趣的概念， p>

I am working on developing an on-screen keyboard with java. This keyboard has a JComponent for every possible key. When a mouse down is detected on the button, I want to send a specific keyboard code to the application currently on focus. The keyboard itself is within a JFrame with no decorations and set to always-on-top.

I found that the Robot class can be used to simulate these keyboard events on the native queue. However, in this case, selecting the JComponent would mean that the key-press is received on the JFrame, and I wouldn't be able to receive it in the other application

How can I keep my on-screen keyboard "Always-without-focus"? Is it maybe possible to use another approach to send the key-press?

解决方案

Apparently the only way to do this is to have a JNI layer that will make the conversion from java to native. Java has no easy way to provide such funcionality.

This could be an interesting concept for a small, third party library for someone who wants to learn JNI...

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