Android 3.1 is an incremental platform release that refines many of the features introduced in Android 3.0. It builds on the same tablet-optimized UI and features offered in Android 3.0 and adds several new capabilities for users and developers.
New Features From The Previous Build
- UI refinements
- Connectivity for USB accessories
- Expanded Recent Apps list
- Resizable Home screen widgets
- Support for external keyboards and pointing devices
- Support for joysticks and gamepads
- Support for FLAC audio playback
- High-performance Wi-Fi lock, maintaining high-performance Wi-Fi connections when device screen is off
- Support for HTTP proxy for each connected Wi-Fi access point
Learn more about Android 3.1 on Wikipedia and Android Developer Site