There are generally three ways to do this:
-
As some of the answers suggested, you could distinguish the cases of your activity being created for the first time and being restored from
savedInstanceState
. This is done by overridingonSaveInstanceState
and checking the parameter ofonCreate
. -
You could lock the activity in one orientation by adding
android:screenOrientation="portrait"
(or"landscape"
) to<activity>
in your manifest. -
You could tell the system that you meant to handle screen changes for yourself by specifying
android:configChanges="orientation|screenSize"
in the<activity>
tag. This way the activity will not be recreated, but will receive a callback instead (which you can ignore as it’s not useful for you).
Personally I’d go with (3). Of course if locking the app to one of the orientations is fine with you, you can also go with (2).