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OS in Mobile Devices 
Instructing Computing Devices : Operating Systems 
1 
Saturday, 29th Nov 2014 yatharthagg@gmail.com
2 OS in Markets 
Shipment in Q2 2014 
85% 
0% 
2% 
12% 
1% 
Android 
iOS 
Windows 
Phone 
BlackBerry 
OS
History……….. 
 In July 2005, Google acquired Android Inc., a small startup company based 
in Palo Alto, CA. Android's co-...
Android Architecture 
Can be divided into Four Layers: 
 The kernel 
 The libraries and runtime 
 The application fram...
The Kernel 
 The architecture is based on the Linux 2.6 kernel. 
 This layer is core of android architecture. It provide...
The Libraries 
 Android has its own libraries, which is written in C/C++. These 
libraries cannot be accessed directly. W...
and Runtime 
 Core Libraries are written in the Java programming language. 
 The core library contains all of the collec...
Runtime continued……. 
 Dalvik Virtual machine is extremely low-memory based virtual machine, 
which was designed especial...
The Application Framework 
 Application Framwork is written in JAVA 
 It is a toolkit that all applications use, ones wh...
• Activity manager:-It manages the lifecycle of applications. It enable proper 
management of all the activities. All the ...
The Application Layer 
 The Application Layer used used by the final user. 
 By installing different applications, the u...
The Android complete…… 
12
13 An example/
It all starts with init() 
14 
daemons runtime 
daemons 
Init 
Linux Kernel 
daemons 
Service 
manager 
System 
Server 
Te...
 Processes 
 Threads 
 Applications 
 Tasks 
 Activity 
 An activity is an application component that provides a scr...
Activity Lifecycle 
 onCreate() : The initial method to set up an 
Activity. 
 onStart() : The application process type ...
17 Navigation of applications 
Home 
System Processes 
Home 
HOME 
Mail 
Mail List 
Mail List Message 
Message 
Browser 
B...
18 
Map 
System Processes 
Home 
HOME 
Browser 
Browser 
Maps 
Map 
Browser 
Mail 
Message 
Message
https.refrences.links.com 
 http://os.itec.kit.edu/downloads/sa_2010_braehler-stefan_android-architecture. 
pdf 
 http:/...
. . Thank 
You . . 
By ~ 
yatharth aggarwal [72511] 
gourav kalbalia [72373] 
kaustabh barman [72530]
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The presentation covers Android architecture in depth with examples and animations depicting the applications and process flow in a nice manner.It also presents the history of android and booting process. Therefore it is necessary to always use (F5) slide show mode to view the presentation.
The presentation was held at Cluster Innovation Centre, University of Delhi for 3rd Semester students of BTech(IT).

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OS in mobile devices [Android]

  1. 1. OS in Mobile Devices Instructing Computing Devices : Operating Systems 1 Saturday, 29th Nov 2014 yatharthagg@gmail.com
  2. 2. 2 OS in Markets Shipment in Q2 2014 85% 0% 2% 12% 1% Android iOS Windows Phone BlackBerry OS
  3. 3. History………..  In July 2005, Google acquired Android Inc., a small startup company based in Palo Alto, CA. Android's co-founders who went to work at Google. included :  Andy Rubin (co-founder of Danger),  Rich Miner (co-founder of Wildfire Communications, Inc.),  Nick Sears (once VP at T-Mobile), and  Chris White (one of the first engineers at WebTV).  On 5 November 2007, the Open Handset Alliance(OHA), a consortium of several companies which include Google, HTC, Intel, Motorola, Qualcomm, T-Mobile, Sprint Nextel and NVIDIA , was unveiled with the goal to develop open standards for mobile devices.  The OHA also unveiled their first product, Android, an open source mobile device platform on the same day. 3
  4. 4. Android Architecture Can be divided into Four Layers:  The kernel  The libraries and runtime  The application framework  The application layer 4
  5. 5. The Kernel  The architecture is based on the Linux 2.6 kernel.  This layer is core of android architecture. It provides service like power management, memory management, security etc.  It helps in software or hardware binding for better communication. 5
  6. 6. The Libraries  Android has its own libraries, which is written in C/C++. These libraries cannot be accessed directly. With the help of application framework, we can access these libraries. There are many libraries like web libraries to access web browsers, libraries for android and video formats etc. 6
  7. 7. and Runtime  Core Libraries are written in the Java programming language.  The core library contains all of the collection classes, utilities, IO, all the utilities and tools that you’ve come to expected to use. 7
  8. 8. Runtime continued…….  Dalvik Virtual machine is extremely low-memory based virtual machine, which was designed especially for Android to run on embedded systems and work well in low power situations.  The Dalvik VM creates a special file format (.DEX) that is created through build time post processing. Conversion between Java classes and .DEX format is done by included “dx” tool. 8
  9. 9. The Application Framework  Application Framwork is written in JAVA  It is a toolkit that all applications use, ones which come with mobile device like Contacts or SMS box, or applications written by Google and any Android developer. 9
  10. 10. • Activity manager:-It manages the lifecycle of applications. It enable proper management of all the activities. All the activities are controlled by activity manager. • Window manager:-It is use to create views and layouts. • Content Providers:-It allows applications to share their data with other applications. • View System:-It contains things like buttons and lists, all the building blocks of the UI. It also handles things like event dispatching, layout drawing. • Package manager:-It is use to retrieve the data about installed packages on device. • Telephony manager:-It is use to handle settings of network connection and all information about services on device. • Resource manager:-It provides access to non-code resources such as graphics etc. • Location manager:-It fires alerts when user enters or leaves a specified geographical location. • Notification manager:-It enables all applications to display custom alerts in status bar. 10
  11. 11. The Application Layer  The Application Layer used used by the final user.  By installing different applications, the user can turn his mobile phone into the unique, optimized and smart mobile phone.  All applications are written using the Java programming language.  These applications works with end user with the help of application framework to operate. 11
  12. 12. The Android complete…… 12
  13. 13. 13 An example/
  14. 14. It all starts with init() 14 daemons runtime daemons Init Linux Kernel daemons Service manager System Server Telephony services Surface flinger Surface flinger System Server Zygote Dalvik VM Booting process
  15. 15.  Processes  Threads  Applications  Tasks  Activity  An activity is an application component that provides a screen with which users can interact in order to do something, such as dial the phone, take a photo, send an email, or view a map.  Each activity is given a window in which to draw its user interface. 15 Application anatomy…
  16. 16. Activity Lifecycle  onCreate() : The initial method to set up an Activity.  onStart() : The application process type changes to visible and the activity is about to be visible to the user.  onDestroy():The counterpart to onCreate()  onResume() : This method is called if the Activity is visible in the foreground and ready to get and process user input.  onPause() : The method has to quickly save uncommitted data and stop CPU intensive work to prepare the Activity to lose the focus and going to background.  onRestart() : This method has to restore a previously saved state of the Activity, as it is called after an activity was completely stopped and is needed again 16
  17. 17. 17 Navigation of applications Home System Processes Home HOME Mail Mail List Mail List Message Message Browser Browser Browser Maps Map Map
  18. 18. 18 Map System Processes Home HOME Browser Browser Maps Map Browser Mail Message Message
  19. 19. https.refrences.links.com  http://os.itec.kit.edu/downloads/sa_2010_braehler-stefan_android-architecture. pdf  http://androidgroup.googlecode.com/files/Introduction%20to%20Android.pdf  http://davidehringer.com/software/android/The_Dalvik_Virtual_Machine.pdf  http://androidteam.googlecode.com/files/Anatomy-Physiology-of-an- Android.pdf  Love you wikipedia 19
  20. 20. . . Thank You . . By ~ yatharth aggarwal [72511] gourav kalbalia [72373] kaustabh barman [72530]

The presentation covers Android architecture in depth with examples and animations depicting the applications and process flow in a nice manner.It also presents the history of android and booting process. Therefore it is necessary to always use (F5) slide show mode to view the presentation. The presentation was held at Cluster Innovation Centre, University of Delhi for 3rd Semester students of BTech(IT).

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