不是.系统键盘没有切换到自定义键盘"按钮.他们甚至都不知道您制作了自定义键盘.

It's not. the system keyboards have no "switch to custom keyboard" button. They're not even aware you made a custom keyboard.

您要完成什么?为什么要构建自定义键盘?如果您告诉我们，也许我们可以建议另一种方法来完成您需要做的事情.

What is it you're trying to accomplish? Why are you building a custom keyboard? If you tell us, maybe we can suggest an alternate way to do what you need to do.