Android FlexBoxLayout
开源地址：https://github.com/google/flexbox-layout
参考资料：http://www.jianshu.com/p/217b3f4a1a18
Created with the help of AndroidFlexBoxLayout by Vension
Copyright 2017 com.github.vension
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.