android what does it mean

Speaking of android, I believe many people are familiar with it, so do you really know what android means? Below, php Chinese website will explain to you what exactly is android?

1: What does android mean

android originally refers to a robot, which is a mobile operating system developed by Google and is An open source code and based on Linux system, currently mainly used in the operating system of smartphones and tablet devices.

2: Android Architecture

Currently Android open source is divided into four layers of architecture and five areas.

1.Linux kernel

Android is based on the Linux kernel, and the Linux kernel provides some simple drivers for display, audio and Bluetooth for some Android devices.

2. System operation layer

The system operation layer is mainly implemented using c language or c. For example, the SQLite library implements the functions of the database and also provides the core when running. Library, of course users can also use java to write Android applications. More importantly, Android needs a Dalvik virtual machine. The Dalvik virtual machine can ensure that applications can run independently.

3. Application framework layer

In the application framework layer, it mainly provides APIs. Currently, the main core programs of the Android system are completed through APIs. Developers can build through APIs. Related programs, such as some activity managers and the like.

4. Application layer

The application layer is the layer where all the programs installed on the phone are, such as the contacts and time that come with the Android system.

3: Android version

The current Android system has been updated to Android 9.0, which was released on May 9, 2018, and the notification bar has been changed. Also added more circles to the overall design.

The above is a complete introduction to what android means. If you want to know more aboutHTML tutorial, please pay attention to the php Chinese website.

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