Android is a open source  Linux Kernel based operating system designed for mobile devices such as smart phones or tablet computers. This was initially developed by Google in the year 2007 and the first commercial version was released in the year 2008 . Its user Interface mainly based on direct manipulation using touch gestures which loosely correspond to the real world interactions. It  offers  a unified approach to application development of mobile devices which allows the application to run on different services by android.

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Versions of Android :

Android/Android Online Training/OnlineITGuru


Android Architecture:

 The architecture of Android is categorized into five parts. Let us discuss them briefly.

Linux Kernel: 

It is the essential component of Android.  It provides the level of abstraction between device hardware and essential drivers like Keypad, Camera, display etc. It also handles the things such as networking and a vast array of device drivers.   It is responsible for Memory Management, Power Management, and Device management.

Android Runtime :

 In android runtime there are  core libraries and DVM(Dalvik Virtual Machine)  which  is responsible to run android application . The Android DVM is line JVM  which is optimized for mobile devices . It consumes less memory and fast performance . It  enables the list of core Libraries which enable android application developers to write android applications  using JAVA programming language.

Android Architecture/Android Online Training/OnlineITGuru

Application Framework:

Application Frame work offers many higher level services  in the form of JAVA Classes .It allows application developers to make user of their services in their applications.

 It provides the following services:

Activity Manager:  All aspects of application life cycle was controlled by the Activity Manager.

Content Providers – It allows applications to publish and share data with other applications.

Resource Manager –   access to non-code embedded resources such as strings , color settings  and user interface layout was provided by the Resource Manger.

Notification Manager – User can get the display alerts and notifications by the notification manager .

View System –   An extensible set of views used to create application user interfaces.

Applications :  

This can be find at the top layer.  All applications such as home , contact , settings, games  and browsers were used by the android framework which in turn uses  Android runtime and libraries .

Android Life cycle :

The life cycle of Android  is controlled by the seven methods of class. This is the subclass of Context Theme Wrapper class.  An activity represents a single screen with a user interface like window or Java. Programs written in C, C++ (or) Java Starts with a main function. Similarly Android system initiates its program with a call  onCreate() call back method. The life cycle of Android is shown below.

Android life cycle/Android Online Training/OnlineITGuru

OnCreate (): It is called when the activity is first created.

OnStart () :  It  is called when the activity becomes visible to the user.

OnResume (): It is called when the user starts interacting application.

OnPause ():This is called only when the current activity is being

paused and previous activity is being resumed.

On Stop (): This is called when the activity is no longer visible.

On Destroy ():This is called when the system is about to be destroyed.

On Restart ():This is called when the activity restarts after stopping it.


Beautiful UI:  It basic screen provides a beautiful and intuitive user interface.

Connectivity:  GSM/EDGE, Wi-Fi, WiMAX, CDMA, Bluetooth, LTE, NFC

Storage: SQLite is a lightweight relational database  and is used for data storage purposes.

Messaging:  SMS, MMS

Multi –tasking:  User can jump from one task to another at the same time simultaneously.

Recommended Audience:

Software Developers

Project Mangers

System Admins

ETL professionals

Prerequisites:   It’s good to have a basic knowledge on object oriented programming languages like JAVA. But it is not mandatory.   Trainers will train you if you do not have knowledge on it.

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