If you want to lock the screen orientation change of any screen (activity) of your android application you just need to set the android:screenOrientation property of an <activity> within the AndroidManifest.xml:

<activity
    android:name="com.techblogon.screenorientationexample.MainActivity"
    android:screenOrientation="portrait"
    android:label="@string/app_name" >
    <!-- ... -->
</activity>

Now that activity is forced to always be displayed in “portrait” mode.