Android APIs
Added in API level 1
package

android.text.util

Utilities for converting identifiable text strings into clickable links and creating RFC 822-type message (SMTP) tokens.

Interfaces

Linkify.MatchFilter MatchFilter enables client code to have more control over what is allowed to match and become a link, and what is not. 
Linkify.TransformFilter TransformFilter enables client code to have more control over how matched patterns are represented as URLs. 

Classes

Linkify Linkify take a piece of text and a regular expression and turns all of the regex matches in the text into clickable links. 
Rfc822Token This class stores an RFC 822-like name, address, and comment, and provides methods to convert them to quoted strings. 
Rfc822Tokenizer This class works as a Tokenizer for MultiAutoCompleteTextView for address list fields, and also provides a method for converting a string of addresses (such as might be typed into such a field) into a series of Rfc822Tokens.