Android apps have slowly been adopting bottom bars in their UI since the option was added to Google’s Material Design spec last year. Apps like Google+ and Google Photos have been prime examples of the design for a while, but recently Spotify has added the same UI to its Android application.
Android is Google’s mobile operating system, launched in September 2008, although its history technically began with the release of the Android alpha in November 2007.
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May 2011 - July 2016