ConstraintLayout

ConstraintLayout

Google官方API傳送門：https://developer.android.google.cn/reference/android/support/constraint/ConstraintLayout.html

翻譯佳作：

http://www.jianshu.com/p/38ee0aa654a8

大神的圖形化界面的操作講解：

http://blog.csdn.net/guolin_blog/article/details/53122387