A software stack for mobile devices: OS kernel, system libraries, - - PowerPoint PPT Presentation

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A software stack for mobile devices: OS kernel, system libraries, - - PowerPoint PPT Presentation

Aug 25, 2023 404 likes •1.17k views

A software stack for mobile devices: OS kernel, system libraries, application frameworks & key apps Android SDK for creating apps Libraries & development tools Lots of documentation. Start browsing today! See:

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A software stack for mobile devices:

OS kernel, system libraries, application frameworks & key apps

Android SDK for creating apps

Libraries & development tools Lots of documentation. Start browsing today!

See: http://developer.android.com/ training

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Security Memory & process management File & network I/O Device drivers

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Power management Android shared memory Low memory killer Interprocess communication And much more

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System C library

Bionic libc

Surface Mgr.

Display management

Media Framework

Audio/ Video

Webkit

browser engine

OpenGL

Graphics engines

SQLite

Relational database engine

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Two main components

Core Java libraries Dalvik Virtual Machine

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basic java classes -- java.*, javax.* app lifecycle -- android.* Internet/Web services -- org. * Unit testing -- junit.*

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Apps are executed by the dalvik virtual machine

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App written in java compiled to Java bytecode files dx converts java bytecode files to a single dex bytecode file (classes.dex) Dalvik executes dex bytecode file

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Designed for resource-constrained environments

Slower CPU Less RAM Limited battery life

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See:

Dalvik VM Internals by Dan Bornstein http://www.youtube.com/watch? v=ptjedOZEXPM

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Keeps track of app packages on device

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Manages the windows comprising an App

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Main Window Notification Bar Subwindow

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Provides common user interface elements

e.g., icons, text entry boxes, buttons and more

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Tabs

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TextView Buttons

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Manages non-compiled resources

e.g., strings, graphics, & layout files

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Manages app lifecycle and navigation stack

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Inter-application data sharing

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Provides location & movement information

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Place notification icons in the status bar when important events occur

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Notification

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Standard apps include:

Home – main screen Contacts – contacts database Phone – dial phone numbers Browser – view web pages Email reader –compose & read email messages

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Nothing special about these apps You can substitute your own or 3rd party app for any of them

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Android Development Environment

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A multi-layered software stack for building and running mobile applications

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Your workbench for writing Android applications

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Installing the Android Developer Tools (ADT) Bundle

Using the Eclipse IDE Using the Android emulator Debugging Android applications Other tools

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Supported Operating Systems: Windows XP, Vista, or Windows 7 Mac OS X 10.5.8 or later (x86 only) Various Linux distributions

See: http://developer.android.com/sdk

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Make sure you have the Java Development Kit (JDK6) installed See:

http:// www.oracle.com/technetwork/java/ javase/downloads

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Download & install the Android Developer Tools (ADT) Bundle

See: http://developer.android.com/sdk

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Latest Android platform Eclipse + ADT plugin Latest system image for emulator Additional development tools

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Runs virtual devices

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Pros

Doesn’t require an actual phone Hardware is reconfigurable Changes are non-destructive

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Cons

Can be very slow Some features unavailable

e.g., no support for bluetooth or USB connections

Performance / user experience can be misleading

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Can emulate many different device/ user characteristics, such as:

Network speed/latencies Battery power Location coordinates

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Emulate incoming phone calls & SMS messages

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Can interconnect multiple emulators

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Many more options See:

http://developer.android.com/guide/ developing/devices/emulator.html

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Tool for examining the internal state of a running application

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General tools for monitoring application behaviors

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DDMS includes

File Explorer Logcat Traceview Hierarchyview

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Graphically display method traces taken from running application

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Shows the runtime organization of the user interface

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Application Fundamentals