[android-developers] It is possible to lock the screen orientation of the phone only when you want? (dinamically)

I have an application that can be viewed with landscape and portrait mode. I'm not using onConfigurationChanged() and android:configChanges="orientation|keyboardHidden" and the screen orientation change is working perfectly. But now, i have a small problem. I want to learn to lock the screen orientation change of the screen. I mean that for example, when the user press a "lock" button, the screen orientation must be locked and it must not change, and when the user press again that button, the screen orientation must get unlocked ¿how can i lock the screen orientation dinamically?

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