How to modify android.inputmethodservice.Keyboard dynamically

Question

Hi friends,I'm developing an app for constructing soft keyboards dynamically. So I'm using this constructor:

Keyboard(Context context, int layoutTemplateResId, CharSequence characters, int columns, int horizontalPadding)

But i want the keys with variable sizes( like Space, Delete larger than other keys). But using the above constructor, all the keys are same size.It's not possible to increase keysize later through code.

Since the keys and their number are not fixed,we cannot use the following constructor

   Keyboard(Context context, int xmlLayoutResId)

which accepts xmllayout file. Any ideas on how to solve this problem ?