What does android device mean?

Android devices mean devices that use the android (Android) operating system, including smart devices such as mobile phones, tablets, and watches that use the Android system. Android is a free and open source operating system based on the Linux kernel. Mainly used in mobile devices, such as smartphones, tablets, TVs, digital cameras, game consoles, smart watches, etc.

The operating environment of this tutorial: ColorOS 12 system, OPPO A72 mobile phone.

Android devices refer to devices using the Android operating system, such as Android phones and other mobile terminal devices equipped with the Android operating system, including smart devices such as mobile phones, tablets, and watches using the Android system.

Android (Android) is a free and open source operating system based on the Linux kernel (excluding GNU components). It is mainly used in mobile devices, such as smartphones and tablets, and is led and developed by the American Google Company and the Open Handset Alliance.

The Android operating system was originally developed by Andy Rubin and mainly supports mobile phones. In August 2005, it was acquired and invested by Google. In November 2007, Google formed the Open Handset Alliance with 84 hardware manufacturers, software developers and telecom operators to jointly develop and improve the Android system. Google then released the Android source code under the Apache open source license. The first Android smartphone was released in October 2008. Android has gradually expanded to tablet computers and other areas, such as televisions, digital cameras, game consoles, smart watches, etc.

Extended knowledge:

Android runs on the Linux kernel, but it is not GNU/Linux. Because most of the functions supported in general GNU/Linux are not supported by Android, including Cairo, X11, Alsa, FFmpeg, GTK, Pango and Glibc, etc., have been removed. Android replaced Glibc with Bionic, Cairo with Skia, FFmpeg with opencore, and so on. In order to achieve commercial application, Android must remove the parts restricted by the GNU GPL license. For example, Android moves the driver to Userspace, completely separating the Linux driver from the Linux kernel. Bionic/Libc/Kernel/ are not standard Kernel header files. Android's Kernel header is generated from the Linux Kernel header using tools to preserve constants, data structures and macros.

Android's Linux kernel control includes security, memory management, process management, network stack, driver model, etc. Before downloading the Android source code, you must first install its build tool Repo to initialize the source code. Repo is a tool used by Android to assist Git work.

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