ANDROID DEVELOPER introduction PPT.pptx

Android

1. ANDROID DEVELOPER JAVA, XML & ANDROID INTRODUCTION

2. JAVA INTRODUCTION Java is a high-level & object oriented programming language. Developed by James Gosling at Sun Microsystems company in 1991 & Initially called “Oak” but was renamed as “Java” in 1995. Initial motivation is to develop a platform independent language to create software to be embedded in various consumer electronics devices. Become the language of internet. (portability and security ) to create interactive websites.

3. Features of Java Simple , Small and Familiar Compiled and Interpreted Object Oriented Portable Large Standard Library

4. 1. Simple , Small and Familiar : Java is a simple programming language and easy to understand since it is written in HLL (high-level-language). Java contains the same syntax as C, and C++,

5. 2. Compiled and Interpreted Java works in two stage : Java compiler translate the source code into byte code(.class file). Java interpreter converts the byte code into machine level representation.

6. 3. Object-Oriented Java is an Object Oriented Programming Language, which means in Java everything is written in terms of classes and objects. Every Real-Time Problems are considered as an Object. The Same object is used to identify the Solutions to given problems.

7. OOPS CONCEPTS : The main concepts of any Object Oriented Programming language are given below:  Object Class Encapsulation(capsules) Polymorphism Inheritance Abstraction Message Passing    

8. 4. Portable Suppose you are running Python on Windows and you need to shift the same to either a Mac or a Linux system, then you can easily achieve the same results in java without having to worry about changing the code. Also known as Platform Independent (or) WORA (Write Once Run Anywhere) . Java Virtual Machine ( J VM ) for Windows is required.

9. 5. Large Standard Library : Out of the box, Java comes inbuilt with a large number of libraries with various variables, keywords, classes & functions & that can be imported at any instance and be used in a specific program for specific task. Eg : String class Math class

10. XML INTRODUCTION XML stands for extensible Markup Language . XML created by J on Bosak at sun microsystems company. XML was designed to store and transport data over a internet. XML was designed to be both human- and machine-readable. XML tags identify the data and are used to store and organize the data, rather than specifying how to display it like HTML tags, which are used to display the data.

11. XML CHARACTERISTICS XML is extensible:  XML allows you to create your own self-descriptive tags, or language, that suits your application. XML carries the data, does not present it:  XML allows you to store the data irrespective of how it will be presented. XML is a public standard:  XML was developed by an organization called the World Wide Web Consortium (W3C) and is available as an open standard since 1998.

12. XML RULES Tags are enclosed in angle brackets <>. Tags come in pairs with Start-Tags & End-Tags. Tags must be properly nested: <name><email>…..</name></email> is not allowed. <name><email>…..</email><name> is allowed

13. CONTINUED… Tags that do not have End-Tags must be terminated by a ‘/’ : Eg : < br /> like HTML Tags are case-sensitive: Eg : <address> is not same as <Address>

14. OHA (Open Handset Alliance) A business alliance consisting of 47 companies to develop open standards for mobile devices.

15. Phones HTC G1, Droid, Tattoo Motorola Droid (X) Suno S880 Samsung Galaxy Sony Ericsson

16. Tablets Velocity Micro Cruz Gome FlyTouch Acer beTouch Dawa D7 Toshiba Android SmartBook Cisco Android Tablet

17. Architecture

18. Android S/W Stack - Application Android provides a set of core applications: Email Client SMS Program Calendar Maps Browser Contacts Etc All applications are written using the Java language.

19. Android S/W Stack – App Framework Enabling and simplifying the reuse of components Developers have full access to the same framework APIs used by the core applications. Users are allowed to replace components.

20. Android S/W Stack – App Framework ( Cont ) Features Feature Role View System Used to build an application, including lists, grids, text boxes, buttons, and embedded web browser Content Provider Enabling applications to access data from other applications or to share their own data Resource Manager Providing access to non-code resources (localized strings, graphics, and layout files) Notification Manager Enabling all applications to display customer alerts in the status bar Activity Manager Managing the lifecycle of applications and providing a common navigation backstack

21. Android S/W Stack - Libraries Including a set of C/C++ libraries used by components of the Android system Exposed to developers through the Android application framework

22. Android S/W Stack - Runtime Core Libraries Providing most of the functionality available in the core libraries of the Java language APIs Data Structures Utilities File Access Network Access Graphics Etc

23. Android S/W Stack – Runtime ( Cont ) Dalvik Virtual Machine Providing environment on which every Android application runs Each Android application runs in its own process, with its own instance of the Dalvik VM. Dalvik has been written such that a device can run multiple VMs efficiently. Register-based virtual machine

24. Android S/W Stack – Runtime ( Cont ) Dalvik Virtual Machine ( Cont ) Executing the Dalvik Executable (. dex ) format . dex format is optimized for minimal memory footprint. Compilation Relying on the Linux Kernel for: Threading Low-level memory management

25. Android S/W Stack – Linux Kernel Relying on Linux Kernel 2.6 for core system services Memory and Process Management Network Stack Driver Model Security Providing an abstraction layer between the H/W and the rest of the S/W stack