Determine the homescreen's appwidgets space grid size

Question

I have developed a re-sizable app-widget for tablets. The app-widget works nice on most devices with the majority of launchers, however there are some problems with the orie

Answer 1

Is there any way to get the size (or close to it) of the grid cell that launcher application using to place the app-widgets on the home screen?

No. Each home screen developer is welcome to do what that developer wishes.

in this launcher it looks pretty small in landscape mode and very big in portrait mode

Then come up with a design that accommodates those sizes. For example, you might look to see what other app widgets do when run on that home screen.