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Android understanding

Android understanding



This presentation basically helps budding enthusiasts to understand the base architecture of Android and board-level features of the platform

This presentation basically helps budding enthusiasts to understand the base architecture of Android and board-level features of the platform



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    Android understanding Android understanding Presentation Transcript

    • JayparAndroidIntroduction
    • Android Introduction
      • Background
      • What is Android
      • Features
      • Android Architecture
      • Linux kernel
      • Native Libraries
      • Android Runtime
      • Application Framework
      • Applications
      • Software Development Kit (SDK)
    • Android Introduction
      Embeded System
      Wikipedia :
      An embedded system is a computer system designed to perform one or a few dedicated functionsoften with real-time computing constraints. It is embedded as part of a complete device often including hardware and mechanical parts.
      Embedded systems are controlled by a main processing core that is typically either a microcontroller or a digital signal processor (DSP).
    • Android Introduction
      Internet and Mobile Phone Users
    • Open Handset Alliance
      • The OHA is a group of hardware and software developers, including Google, NTT DoCoMo, Sprint Nextel, and HTC …
      • Goal
      • Accelerate innovation in mobile
      • Offer consumers a richer, less expensive, and better mobile experience
      • OHA have developed Android™, the first complete, open, and free mobile platform
      Android Introduction
    • Android Introduction
      Google Phone
      HTC Dream , T mobile G1, announced at 2008.09
      HTC Hero, HTC Magic, HTC Tatoo
      SAMSUNG Galaxy i7500
    • What is Android ?
      Android is a software stack for mobile devices that includes an operating system, middleware and key applications.
      Android is a Java-based operating system that runs on the Linux 2.6 kernel.
      The Android SDK provides the tools and APIs necessary to begin developing applications on the Android platform using the Java programming language.
      Android Introduction
    • Features
      • Application framework enabling reuse and replacement of components
      • Dalvik virtual machine optimized for mobile devices
      • Integrated browser based on the open source WebKit engine
      • Optimized graphics powered by a custom 2D graphics library; 3D graphics based on the OpenGL ES 1.0 specification (hardware acceleration optional)
      • SQLite for structured data storage
      Android Introduction
    • Features(con’t)
      • Media support for common audio, video, and still image formats (MPEG4, H.264, MP3, AAC, AMR, JPG, PNG, GIF)
      • GSM Telephony (hardware dependent)
      • Bluetooth, EDGE, 3G, and WiFi (hardware dependent)
      • Camera, GPS, compass, and accelerometer (hardware dependent)
      • Rich development environment including a device emulator, tools for debugging, memory and performance profiling, and a plugin for the Eclipse IDE
      Android Introduction
    • Android Introduction
      Android Architecture
    • Android Introduction
      Linux Kernel
      • Android is built on the Linux kernel, but Android is not Linux
      • Provide core system services such as process, memory, power management, network stack, driver model and security
      • Does not include the full set of standard Linux utilities
      The Android kernel source is available today
    • Android Introduction
      Native Libraries
      Bionic Libc
      Function Libraries
      Native Servers
      Hardware Abstraction Libraries
    • Android Introduction
      Bionic Libc
      • C/C++ library
      • Custom libc implementation, optimized for embedded use.
      • Pros (compare with glibc)
      • BSD License
      • Small size and fast code paths
      • Very fast and small custom pthread implementation
      • Not compatible with Gnu Libc (glibc)
    • Android Introduction
      Function Libraries
      • WebKit
      • Based on open source WebKit browser
      • Full CSS, Javascript, DOM, AJAX support
      • Media Framework
      • Based on PacketVideoOpenCORE platform
      • Supports standard video, audio, still-frame formats
      • SOLite
      • Light-weight transactional data store
      • Back end for most platform data storage
    • Android Introduction
      Application Developed language : Java
      Dalvik Virtual Machine
      Instruction set : DalvikExcutable
      Java Standard Library
      Compile java code to DalvikExecutable (dex format)
    • Android Introduction
      Dalvik Virtual Machine
      • Android custom implementation virtual machine
      • Provides application portability and runtime consistency
      • Runs optimized file format (.dex) and Dalvikbytecode
      • Java .class / .jar files converted to .dex at build time
      • Designed for embedded environment
      • Supports multiple virtual machine processes per device
      • Highly CPU-optimized bytecode interpreter
      • Efficiently Using runtime memory
      • Core Libraries
      • Core APIs for Java language provide a powerful, yet simple and familiar development platform
    • Android Introduction
      Application Framework
      • Activity manager
      • Manage the life cycle of applications
      • Content Provider
      • Share data between applications
      • Resource Manager
      • Manager non-code resource
      • Notification Manager
      • Display custom alerts in the status bar
      • Views System
      • A rich and extensible set, which can construct UI
    • Android Introduction
      Use the powerful and flexible application framework to develop your application
      Written by JAVA programming language
    • Android Introduction
      Application Development Environment
      IDE – Eclipse
      Eclipse plug-in - ADT
      Software Development Kit (SDK)
      Android Emulator
    • Android Introduction
      Software Development Kit
      • The Android SDK includes a variety of custom tools that help you develop mobile applications on the Android platform.
      • Android Emulator
      • Android Development Tools Plugin (for the Eclipse IDE)
      • Android Virtual Devices (AVDs)
      • Hierarchy Viewer
      • Android Debug Bridge (adb)
    • Android Introduction
      Virtual mobile device
      QEMU-based ARM emulator
      Design application in an actual Android runtime environment
      Use the same toolchain
      Run the same binary
    • Android Introduction
      - Y. Ramesh Rao