强制横屏或竖屏

OS:安卓5.1

修改文件：frameworks/base/services/core/java/com/android/server/wm/WindowManagerService.java 

在函数updateOrientationFromAppTokensLocked添加蓝色字体表示强制为横屏，
强制为竖屏添加：req = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT

boolean updateOrientationFromAppTokensLocked(boolean inTransaction) {        long ident = Binder.clearCallingIdentity();        try {            int req = getOrientationFromWindowsLocked();            if (req == ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED) {                req = getOrientationFromAppTokensLocked();            }           req = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;//强制为横屏，            if (req != mForcedAppOrientation) {                mForcedAppOrientation = req;                //send a message to Policy indicating orientation change to take                //action like disabling/enabling sensors etc.,                mPolicy.setCurrentOrientationLw(req);                if (updateRotationUncheckedLocked(inTransaction)) {                    // changed                    return true;                }            }            return false;        } finally {            Binder.restoreCallingIdentity(ident);        }    }