Xoay Man Hinh - Huong dan cach xoay man hinh trong manifest

XOAY NGANG :

<activity android:name="MyActivity"
android:screenOrientation="landscape"
android:configChanges="keyboardHidden|orientation|screenSize">
...
</activity>

XOAY DOC :

<activity android:name="MyActivity"
android:screenOrientation="portrait"
android:configChanges="keyboardHidden|orientation|screenSize">
...
</activity>

OR Code tham khao : 

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

when I switch to the landscape mode activity, and
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR);