Transcript Android architecture

Android architecture
&
setting up
• Android operating system comprises of different software
components arranges in stack.
• Different components of android operating system are:Linux kernel
libraries
Android Run time
Application framework
Applications
Linux kernal
• Provides the basic system functionality such as process
management,memory management & device management
• Provide array of divice drivers to interface the android with peripheral
devices.
Libraries
• On the top of linux kernel.
• Provide different libraries useful for well functioning of android
platform.
Libraries
Explanation
SQLite
It is used to access data published by
content providers & includes SQLite
database management classes.
SSL
It is used to provide internet security.
OpenGL
It is used to provide java interface to the
openGL/ES 3D graphics rendering API.
Media framework
It is used to provide different media
codecs which allow the recording &
playback of different media formats.
WebKit
It is the browser engine used to display
internet content or HTML content.
Android Runtime
• 3rd component.placed in 2nd layer from bottom.
• It contain DVM.
• DVM is similar to JVM;difference is it is designed & optimized for
Android.
• DVM uses core functions of Linux such as memory management and
multithreading & enables each android app to run its own process.
Application Framework
• 2nd topmost component in android operating system stack.
• Android application directly interact with application framework.
• It manages the basic functions of android device such as resource
management,voice call management etc
Important blocks of Application framework are
Block
Explanation
Activity manager
Block is used to manage complete activity lifecycle of
applications
Content providers
Block is used to manage the data sharing between two
applications
Telephony Manager
Block is used to manages all voice calls
Location Manager
Block is used to manage the location obtained using
GPS or cell tower
Resource Manager
Block is used to manage the different types of
resources used in android app
Applications
Applications created by third party users or
developer will be installed on application layer.
Setting up local environment to create
android application
• We can start android application development in Microsoft Windows
XP & higher versions of windows.
System Requirements
•
•
•
•
•
•
•
•
Windows
Microsoft® Windows® 8/7/Vista/2003 (32 or 64-bit)
2 GB RAM minimum, 4 GB RAM recommended
400 MB hard disk space
At least 1 GB for Android SDK, emulator system images, and caches
1280 x 800 minimum screen resolution
Java Development Kit (JDK) 7
Optional for accelerated emulator: Intel® processor with support for Intel®
VT-x, Intel® EM64T (Intel® 64), and Execute Disable (XD) Bit functionality
Then…
• Android SDK
• Eclipse IDE for java Developers
• Android Development tools(ADT)Eclipse Plugin
• Steps 1:- Download android SDK from the android developer website.
• Step 2:-After downloading the complete package extract the zip file.
You need to open the eclipse from eclipse->eclipse.exe. Once
you open the eclipse you will able to see SDK icon on top of eclipse IDE.
Step 3:-After clicking on the icon you will be prompted to download all
the necessary packages.
Step 4:-After downloading all the packages you will able to develop
android application for any version.
Downloaded stuff will go into sdk->platform folder.
Create android virtual device(AVD)
• AVD provide you virtual emulator to test your android app.
SDK Manager
AVD
ADT Plugin (1)
• In Eclipse, go to Help -> Install New Software
• Click ‘Add’ in top right
• Enter:
• Name: ADT Plugin
• Location: https://dl-ssl.google.com/android/eclipse/
•
•
•
•
Click OK, then select ‘Developer Tools’, click Next
Click Next and then Finish
Afterwards, restart Eclipse
Specify SDK location (next 3 slides)
• Must do this every time start a new project in a new location (at least in Windows)
ADT Plugin (2)
ADT Plugin (3)
ADT Plugin (4)
Android Studio Setup Guide for
Windows
CONTENTS (Est. Total Time Required: 60 min)
Install Java (5 min)
Set Your JAVA_HOME (5 min)
Install Android Studio (15 min)
Install Android System Images and Tools (30 min)
Create an Android Virtual Device (AVD) (5 min)