Tutorial by Topics: constraints

// +build tags Build tags are used for conditionally building certain files in your code. Build tags may ignore files that you don't want build unless explicitly included, or some predefined build tags may be used to have a file only be built on a particular architecture or operating system...

Constraints are a term used in all of the existing C specifications (recently ISO-IEC 9899-2011). They are one of the three parts of the language described in clause 6 of the standard (along side syntax and semantics). ISO-IEC 9899-2011 defines a constraint as a: restriction, either syntactic ...

This class allows you to define programmatically a set of constraints to be used with ConstraintLayout. It lets you create and save constraints, and apply them to an existing ConstraintLayout.