Convalida 
Convalida - (Italian for "validation")
Convalida is a simple, lightweight and powerful field validation library for Android.
Documentation
Go to the website for more information.
License
Copyright 2017 Wellington Costa
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.