lock/unlock orientation
Per http://developer.android.com/reference/android/R.attr.html#screenOrientation (screenOrientation being what those values are linked to if you dig through the documentation), SCREEN_ORIENTATION_SENSOR
or SCREEN_ORIENTATION_FULL_SENSOR
will do it, depending on how much flexibility you want -- however, I suspect what you really want is to go back to the default setting, which is SCREEN_ORIENTATION_UNSPECIFIED
so that it goes back to the system defaults, including any the user set.
An easy fix for this that worked for me is to add a line to AndroidManifest.xml like so:
Add android:screenOrientation="portrait"> in the application section.
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".App"
android:label="@string/app_name"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>