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Android Software Stack (Android Architecture (Framework (Location Manager,…

- - - - Allowing apps to receive location/movement info like GPS
      - Allow context specific tasks : Finding direction from the current location
      - GPS
        
        most accurate
        
        low battery
        
        primarily for out door
    - - Manages the many windows comprising an app
    - - installs/removes applications
      - track of app packages, data sharing +services
    - - Responsible for starting, stopping and resuming
      - Manages the lifecycle of applications
      - providing a common navigation back stack(
    - - Allowing interaction with phone, SMS and MMS services
    - - Provides common graphical elements
      - (Used to build UI)
      - including buttons, and embedded web browser. Phone tab/call log tab/contact tab
    - - Enabling applications to access data from other applications
      - OR enable to share their own data with other app
    - - Providing access to non-compiled resources
      - such as string, graphical and layout file
    - - Alerts the user about occurring important events.
      - Enabling all applications to display customer alerts
        
        flashing light
        
        vibrations
        
        status bar,
  - - - SGL,
        
        underlying 2D graphics engine
      - 3D libraries
        
        implementation based on OpenGL
    - - support playback and recording of many popular audio and video formats,
      - supporting images file like PNG and JPG
    - - powerful and lightweight relational database engine
    - - bitmap and vector font rendering (مسؤولة عن لستايل بشكل عام )
    - - modern web browser engine
      - powers both the Android browser and an embeddable web view
    - - the standard C system
      - tuned for embedded Linux-based devices
    - - manages access to the display subsystem
      - seamlessly composites 2D and 3D graphic layers from multiple applications
  - - - Providing most of the functionality available in the core libraries of the Java language
      - APIs
        
        Data Structures
        
        File Access
        
        Network Access
        
        Graphics
        
        Utilities
    - - Providing environment on which every Android application runs
      - Each Android application runs in its own process, with its own instance of the DalvikVM.
      - Dalvikhas been written such that a device can run multiple VMs efficiently
      - Relying on Linux Kernel for low level functionality
        
        Security
        
        threading,
        
        process and memory management
      - Executing the DalvikExecutable (.dex) format
      - ByteCode
        
        is an abstract machine instruction set.
        
        Dalvik
        
        Dalvik = Java source code ==JavaCombiler==> Java bytecode==Dex compiler ==> dalvik bytecode==(Dalvikinterprets Java bytecode.) ==> dalvik executable
        
        Only supports a subset of standard Java Library
        
        Google
        
        Java
        
        Java = Java source code==javaCompiler==> java bytecode ==> java bytecode
        
        Sun
  - - - (secure multi-process environment)
    - - easy to compile on different hardware architectures