Delete <uses-feature android:name="android.hardware.screen.portrait" />
from your androidManifiest.xml
and add this
android:screenOrientation="portrait"
This is how part of your androidMadifiest.xml should look
<activity android:name="HelloWorld" android:label="@string/app_name"
android:theme="@android:style/Theme.Black.NoTitleBar"
android:screenOrientation="portrait"
android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale">