Android 2.2.x Froyo

Google's Nexus Oneintroduced Android 2.2 Froyo.

Speed, memory, and performance optimizations
Additional application speed improvements, implemented through JIT compilation
Integration of Chrome's V8 JavaScript engine into the Browser application
Support for the Android Cloud to Device Messaging (C2DM) service, enabling push notifications
Improved Microsoft Exchange support, including security policies, auto-discovery, GAL look-up, calendar synchronization and remote wipe
Improved application launcher with shortcuts to Phone and Browser applications
USB tethering and Wi-Fi hotspot functionality
Added an option to disable data access over mobile network
Updated Market application with batch and automatic update features
Quick switching between multiple keyboard languages and their dictionaries
Voice dialing and contact sharing over Bluetooth
Support for numeric and alphanumeric passwords
Support for file upload fields in the Browser application
Support for installing applications to the expandable memory
Adobe Flash support
Support for extra-high-PPI screens (320 ppi), such as 4" 720p

The Android 2.2.1 update was released on 18 January 2011, and included a number of bug fixes, security updates, and performance improvements.

The Android 2.2.2 update was released on 22 January 2011, and fixed minor bugs, including SMS rooting issues that affected the Nexus One.

The Android 2.2.3 update was released on 21 November 2011, and consisted of two security patches.

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