Numeric keypad by default using libgdx

问题

I have 3 TextFields to introduce the day, month and year.
At the moment i show the KeyPad, but the user needs to switch to the numeric KeyPad manually. How can I set up a numeric keypad by default for a textfield in libgdx?

来源：https://stackoverflow.com/questions/22982226/numeric-keypad-by-default-using-libgdx