您好，我下载了您的示例，进入自定义键盘的页面，获取焦点后，返回主页面时出现了异常

[kmarryme]

Unhandled Exception: Looking up a deactivated widget's ancestor is unsafe.
At this point the state of the widget's element tree is no longer stable.
To safely refer to a widget's ancestor in its dispose() method, save a reference to the ancestor by calling inheritFromWidgetOfExactType() in the widget's didChangeDependencies() method.

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[Im-Kevin]

好的,我看看

[Im-Kevin]

问题已经修复