Android is an open-source mobile operating system based on a modified version of the Linux kernel and other open source software, designed primarily for touchscreen mobile devices such as smartphones and tablets.

Android also is a Smart TV operating system.

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Android Development Guide

Install Android Development Studio

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http://www1.alx.pl/w/android/android101

http://www1.alx.pl/w/android/android201

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https://www.android.com/