Google Kills Android Menu Button

Google Kills Android Menu Button, Replaces It with Action Bar

Android's Menu button is dead. Long live the action bar?
Following down the path blazed by the Samsung Galaxy Nexus, the first Ice Cream Sandwich phone, Google has declared the Menu button dead, leaving just three – the Back, Home, and Recent Apps button – to remain at the bottom of the phone.
Instead, Google recommends that app developers begin using the "action bar," a small dedicated space that identifies the application and what actions users can take. (One example of an action bar might be at the top of the Google G+ application for phones, where the application is identified and users have a choice of actions: searching, writing a post, or opening their notifications. For another, see the image below.)
"Not only should your apps stop relying on the hardware Menu button, but you should stop thinking about your activities using a 'menu button' at all," Scott Main, lead tech writer for developer.android.com, wrote in a blog post on Thursday. "Your activities should provide buttons for important user actions directly in the action bar (or elsewhere on screen). Those that can't fit in the action bar end up in the action overflow."