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Table of Contents
An Overview of Android:
Android is a Linux based operating system. It is design for touchscreen mobile devices such as smartphones and tablet computers. Android applications are created in Java programming language and support multitasking.
The android operating system supports a large number of applications in Smartphones. These applications are more comfortable and advanced for the users. The android is an open source operating system means that it’s free and anyone can use it
The basic working of an android application framework
Android operating system is a stack of software components. It is roughly divided into five sections layers as shown below in the diagram.
- Linux Kernel:
The lowest layer of the Android framework is the Linux kernel for low-level hardware interfaces. This provides a level of abstraction between the device hardware and it contains all the essential hardware drivers like camera, keypad, display etc. It also provides basic system functions such as process management, memory management, and device management.
On top of Linux kernel there is a set of libraries including open-source Web browser engine Web Kit, well-known library, SQLite database which is a useful repository for storage and sharing of application data, libraries to play and record audio and video, SSL libraries responsible for Internet security etc.
- Android Runtime:
This is the third section of the architecture and available on the second layer from the bottom. This section provides a key component called Dalvik Virtual Machine which is a kind of Java Virtual Machine specially designed and optimized for Android.
The Android runtime also provides a set of core libraries which enable Android application developers to write Android applications using standard Java programming language.
Dalvik is a register-based Virtual Machine that’s been optimized to ensure that a device can run multiple instances efficiently.
- Application Framework:
The Application Framework layer provides many higher-level services to applications in the form of Java classes. Android applications directly interact with an application framework. It manages the basic functions of the Android device such as resource management, voice call management etc.
You will find all applications in Android, both native and third-party, are built on the application layer. The application layer provides the user interface to an application which runs on the Android runtime, using the pre-built classes and services made available from the application framework. Examples of such applications are Contacts Books, Browser, and Games etc.
Some features of Android
- Good User interface
- Connectivity: GSM/EDGE, IDEN, CDMA, Bluetooth, WI-FI, EDGE,3G,NFC, LTE,GPS.
- Multi Language support
- Video calling
- Screen capture
- External storage
- Optimized graphics
- Media support
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