[android-developers] How to check when the phone changues from portrait to landscape? (with portrait mode forced in manifest)

I have a special need for my app. I must force the app to work only in
portrait mode, but i need to know when the user has moved the phone to
landscape mode. Why? because i am displaying a opengl view with a
texture image, and when the user changues the phone position to
landscape mode i must rotate the polygon without reseting the
activity. Then i must force portrait mode on manifest, because i dont
want that my onCreate method gets called again.

Please, can someone tell me how to achieve this?

I know how to rotate the image, i only need to know when the user has
moved the phone to landscape position, but with portrait forced on
manifest.

Thanks

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