Google have launched ‘Apps For Android’, which is an open source collection of sample Android Applications. The goal of the sample collection is to share sample applications that will demonstrate the features of the Android platform on the cell phones.

The first android application sahred is Wikinotes, “a wiki note pad that uses intents to navigate to wiki words and other rich content stored in the notes.”

The Wikinotes application demonstrates a number of core concepts:

• Multiple Activities in an Application (View, Edit, Search, etc.)
• Default intent filters for View/Edit/Search based on MIME types
• Life Cycle of activities
• Message passing via Bundles in Intents
• Use of Linkify to add Intent-firing links to text data
• Using Intents within an application
• Using Intents to use an Activity within another application
• Writing a custom ContentProvider that implements search by note title
• Registration of ReST-like URIs to match titles, and do contents searches
• SQLite implementations for insert, retrieve, update, delete and search
• UI layout and creation for multiple activities
• Menus and keyboard shortcuts