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Android architecture overview. Android. A software stack for mobile devices developed and managed by Open Handset Alliance Free software under Apache License. Android. Key Applications. Middleware. Operating System (Linux Kernel 2.6). OHA (Open Handset Alliance).

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Presentation Transcript
android
Android
  • A software stack for mobile devices developed and managed by Open Handset Alliance
  • Free software under Apache License

Android

Key Applications

Middleware

Operating System (Linux Kernel 2.6)

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

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android software stack linux kernel
Android Software 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 hardware and the rest of the softwarestack

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android software stack runtime
Android Software 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

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android software stack runtime cont
Android Software 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 so that a device can run multiple VMs efficiently.
    • Register-based virtual machine

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android software stack runtime cont1
Android Software 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

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android software stack libraries
Android Software Stack - Libraries
  • Including a set of C/C++ libraries used by components of the Android system
  • Exposed to developers through the Android application framework

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android software stack app framework
Android Software 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.

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android software stack application
Android Software 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.

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reference
Reference
  • North Carolina State University: Android Real Time Systems, http://code.google.com/edu/submissions/ncsu-rts/

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y our first android app
Your first Android app

Hello Android!

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types of android apps
Types of Android apps
  • Foreground: application that is effectively suspended when it is not visible
  • Background: spends most of its lifetime hidden
  • Intermittent: some interactivity, but most work done on background
  • Widget: home screen app

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understanding hello android
Understanding: Hello Android
  • Activity: base class for visual, interactive components of your app

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understanding hello android1
Understanding: Hello Android
  • View: visual components, visual interface

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understanding hello android2
Understanding: Hello Android
  • Resources: stored in res
    • Drawable,
    • layout, and
    • values

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