Android 1.0

• Android Market
• Camera support
• Gmail app & sync
• Contacts sync w/ People app
• Calendar sync w/ Calendar app
• Google Maps, Sync, Search & Talk
• IM, SMS, MMS
• Media Player
• Custom notifications & wallpapers
• Voice Dialer
• YouTube Player
• Wi-Fi & Bluetooth Support

1.5 Cupcake

• Support for Widgets
• Soft-keyboard w/ text-prediction
• Bluetooth A2DP, AVRCP Support
• Record / watch videos
• Copy & paste in browser
• Animated screen transitions
• Auto-rotation
• New stock boot animation
• Upload videos to YouTube
• Upload photos to Picasa

1.6 Donut

• Quick Search Box
• Gallery, camera, camcorder integration
• CDMA/EVDO, 802.1x & VPNs support
• Battery usage indicator
• Text-to-speech engine
• Multilingual speech synthesis engine
• Easier search, app screenshots in Market
• WVGA screen resolution support
• New Gestures Builder dev tool
• New framework APIs

2.0 Eclair

• Multiple Accounts
• Turn-by-turn navigation for Google Maps
• Email & contact sync
• Exchange email support
• Quick contact
• Bluetooth 2.1 support
• Search for saved SMS & MMS
• Live wallpapers
• New Camera features
• Browser support for HTML5
• New framework APIs
• Optimized hardware speed
• Multiple screen sizes & resolutions support

2.2 Froyo

• Android Cloud to Device Messaging (C2DM)
• Improved Exchange support
• Dedicated shortcuts on Home Screen
• Chrome V8 JS engine in browser
• Portable Wi-Fi hotspot functionality
• Disable data access over mobile
• Voice dialing, contact sharing over Bluetooth
• Bluetooth-enabled dock support
• Numeric & alphanumeric password support
• Adobe Flash Support
• Extra-high PPI screen support
• Multiple keyboard languages
• “Card Mode” & “Night Mode” UI frameworks

2.3 Gingerbread

• Near Field Communication (NFC)
• Better control over apps
• ACess to multiple cameras
• XL screen sizes and resolutions support
• Native input & sensor events
• New mixable audio effects
• SIP-based internet telephony
• New Download Manager
• WebM/VP8 Video playback support
• AAC audio encoding support
• Open API for native audio
• Robust native dev environment
• Multitouch keyboard
• Improved copy/paste
• Video chat in Google Talk

3.0 Honeycomb

• New virtual & “holographic” UI
• Added System Bar
• Added Action Bar
• Simplified multitasking
• Customizable home screen
• Redesigned keyboard
• Multiple browser tabs replace windows
• Quick access to camera features
• Support for video in Google Talk
• Hardware acceleration
• Ability to encrypt all user data

4.0 Ice Cream Sandwich

• Recent Apps multitasking
• Android Beam for NFC
• Apps accessible from lock screen
• Drag and Drop folder creation
• Resizable widgets
• Integrated screenshot capture
• Real-time speech to text dictation
• Face Unlock
• Goolge Chrome
• Data usage warnings
• Shut down apps in background
• Built-in photo editor
• WebP image format support
• Wi-Fi Direct
• Consolidated platform for phones & tablets
• Swipe to dismiss notifications

4.1 Jelly Bean

• Google Now search app
• Google Cloud Messaging (GCM)
• Vsync timing
• Triple buffering in Graphics pipeline
• Synchronized & anticipatory touch
• Multiple language support
• User-installed keymaps
• Expandable notifications
• Android Beam w/ Blutooth data transfer
• Offline voice dictation
• Multichannel & USB audio
• Gapless playback
• Project Butter: improved performance & smoothness
• Actionable Notifications
• Lockscreen widgets
• Multi-user sUpport
• Multi-screen support