Add preliminary code for managing screen orientation.
Add preliminary code for managing screen orientation.

liuyq/aster,leijian/aster,Ryan2009/aster,kanru/aster,z7z8th/aster,kanru/aster,kanru/aster,z7z8th/aster,walkingice/aster,cuongmv162/aster,Ryan2009/aster,walkingice/aster,liuyq/aster,leijian/aster,cuongmv162/aster,walkingice/aster,cuongmv162/aster,liuyq/aster,leijian/aster,Ryan2009/aster,z7z8th/aster