@OwnerUser public boolean isActiveDeviceOwner() {
		return mDevicePolicyManager.isAdminActive(sCachedComponent) && mDevicePolicyManager.isDeviceOwnerApp(sCachedComponent.getPackageName());
	}
@return the profile owner component (may not be present), or null for failure
shared/src/main/java/com/oasisfeng/island/util/DevicePolicies.java