private boolean isActiveDeviceAdmin(String packageName, int userId) {
DevicePolicyManager dpm = getContext().getSystemService(DevicePolicyManager.class);
if (dpm == null) return false;
List<ComponentName> components = dpm.getActiveAdminsAsUser(userId);
if (components == null) return false;
final int size = components.size();
for (int i = 0; i < size; i++) {
if (components.get(i).getPackageName().equals(packageName)) {
return true;
}
}
return false;
}