Can some explain this InputMethod classes in OpenSudoku source code?

I am trying to understand the OpenSudoku source code. I understand how the Board is drawn and how the onTouch event is processed. The only problem is there is a whole InputMethod package and about 8 classes in the package. Why do we need that package in the first place? Also the InputMethod class has a initialize() function. Why is that? Can I disable touch or keyboard input specifically for my app?

Thanks for any help. I am still learning Android dev and this will开发者_开发百科 be of help.

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Read about Creating Input Methods on the android developer site. I'm not familiar with OpenSudoku but I assume that they created an InputMethod that is only numbers or something so that you only input numbers into the TextViews in the grid.

InputMethod doesn't have an initialize method so I think that is just a method they added to setup the InputMethod.