android设置系统 默认方向

frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java

 

public int rotationForOrientationLw(int orientation, int lastRotation) {

　　synchronized (mLock) {

　　int sensorRotation = mOrientationListener.getProposedRotation();

　　if (sensorRotation < 0) {

　　　　mPortraitRotation = Surface.ROTATION_270;

　　　　mLandscapeRotation = Surface.ROTATION_0;

　　　　mUpsideDownRotation = Surface.ROTATION_90;

　　　　mSeascapeRotation = Surface.ROTATION_180;

　　}

　　...

}