Change screen orientation in Android without reloading the activity
See the edit by @luisfer. For targeting Android 3.2 and above, you need BOTH
android:configChanges="orientation|screenSize"http://developer.android.com/guide/topics/resources/runtime-changes.html#HandlingTheChange
You need to override onSaveInstanceState(Bundle savedInstanceState) and write the application state values you want to change to the Bundle parameter
In AndroidManifest file add android:configChanges="orientation" for the activity you want to handle this orientation
In activity use onConfigurationChange overrided method. Do task you want to handle in orientation change.