What is the Difference Between Android 3.0 (Honeycomb) and Android 4.0 (Ice Cream Sandwich)?

Android 3.0 (Honeycomb) and Android 4.0 (Ice Cream Sandwich) are two different versions of the Android operating system, with Honeycomb being exclusively designed for tablet devices, while Ice Cream Sandwich was created as a unified platform for both smartphones and tablets. Some key differences between the two include:

1. User Interface: Ice Cream Sandwich inherits the platform additions from Honeycomb and introduces a new visual design, code-named "Holo," which is built around a cleaner, flat design with neon hard edges and drop shadows for depth. It also introduces a new default system font, Roboto.
2. Virtual Buttons: Ice Cream Sandwich introduces virtual buttons in the System Bar, while Honeycomb has physical buttons.
3. Resizable Interactive Widgets: Ice Cream Sandwich allows for resizable interactive widgets, while Honeycomb does not.
4. New Home Screen: Ice Cream Sandwich features a new home screen with folders, while Honeycomb does not.
5. Lock Screen Action: Ice Cream Sandwich introduces new lock screen actions, such as swiping to unlock or access the camera, while Honeycomb does not.
6. Improved Keyboard and Spell Checker: Ice Cream Sandwich comes with an improved keyboard and spell checker, while Honeycomb does not.
7. Voice Recognizer: Ice Cream Sandwich features a voice recognizer, which is a competitor to Siri on iOS devices, while Honeycomb does not.
8. Bluetooth Health Device Profile: Ice Cream Sandwich adds support for the Bluetooth Health Device Profile, which is not present in Honeycomb.
9. Near-Field Communication (NFC): Ice Cream Sandwich adds support for NFC, which is not present in Honeycomb.
10. Wi-Fi Direct: Ice Cream Sandwich supports Wi-Fi Direct, which is not present in Honeycomb.
11. Ambient Temperature and Humidity Sensors: Ice Cream Sandwich inherits platform additions from Honeycomb and adds support for ambient temperature and humidity sensors.

In summary, Android 4.0 (Ice Cream Sandwich) represents a significant evolution from Android 3.0 (Honeycomb), with improvements to the user interface, new features, and enhanced compatibility for both smartphones and tablets.

Comparative Table: Android 3.0 (Honeycomb) vs Android 4.0 (Ice Cream Sandwich)

Here is a table comparing the differences between Android 3.0 (Honeycomb) and Android 4.0 (Ice Cream Sandwich):

Android 3.0 (Honeycomb) was designed specifically for tablets and introduced a 3D user interface. Android 4.0 (Ice Cream Sandwich), on the other hand, was designed for both phones and tablets, and featured a more user-friendly interface with enhancements such as a new typeface called 'Roboto'. Ice Cream Sandwich also introduced features like folders on the home screen, face unlock, and improved voice recognition.