android:screenOrientation = ["unspecified" | "behind" |
"landscape" | "portrait" | "reverseLandscape" | "reversePortrait" | "sensorLandscape" | "sensorPortrait" | "userLandscape" | "userPortrait" | "sensor" | "fullSensor" | "nosensor" | "user" | "fullUser" | "locked"]带sensor的都是会根据重力旋转的。