Android version history : Android 2.2 Froyo

2.2.2 latest release.Based on Linux kernel 2.6.32. On 20 May 2010, the 2.2 (Froyo) SDK was released.Changes included: System: Speed, memory, and performance optimizations Additional application speed improvements courtesy of JIT implementation Integration of Chrome's V8 JavaScript engine into the Browser application Improved Microsoft Exchange support (security policies, auto-discovery, GAL look-up, calendar synchronization, 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 Display: Support for extra high PPI screens (320 ppi), such as 4" 720p