Android 1.5 r1

Android 1.5 r1 was released on 2009-04-27, which was based on Linux kernel 2.6.27. This was the first version to use a dessert as a codename. ("Cupcake") This update included several improvements and UI changes.

Features

 * Support for third-party virtual keyboards with text prediction and user dictionary for custom words.
 * Support for Widgets: miniature application views that can be embedded in other applications. Some receive periodic updates.
 * Video recording and playback in MPEG-4 and 3GP formats.
 * Auto-pairing and stereo support for Bluetooth (A2DP and AVRCP profiles).
 * Copy and paste features in the web browser.
 * User pictures shown for Favorites in Contacts.
 * Specific date/time stamp shown for events in the call log, and one-touch access to a contact card from call log event.
 * Animated screen transitions.
 * Auto-rotation option.
 * New stock boot animation.
 * You can upload videos to Youtube.
 * You can upload photos to Picasa.