1 - introduction about android programming concepts

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android programming

1
Android Introduction
Platform Overview

2
What is Android?
 Android is a software
stack for mobile devices
that includes an
operating system,
middleware and key
applications.

3
OHA (Open Handset Alliance)
 A business alliance consisting of 47 companies
to develop open standards for mobile devices

4
Phones
HTC G1,
Droid,
Tattoo
Motorola Droid (X)
Suno S880 Samsung Galaxy Sony Ericsson

5
Tablets
Velocity Micro Cruz Gome FlyTouch Acer beTouch
Dawa D7
Toshiba Android
SmartBook
Cisco Android Tablet

7
Android S/W 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.

8
Android S/W 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.

9
Android S/W Stack –
App Framework (Cont)
 Features
Feature Role
View
System
Used to build an application, including lists, grids, text
boxes, buttons, and embedded web browser
Content
Provider
Enabling applications to access data from other
applications or to share their own data
Resource
Manager
Providing access to non-code resources (localized strings,
graphics, and layout files)
Notification
Manager
Enabling all applications to display customer alerts in the
status bar
Activity
Manager
Managing the lifecycle of applications and providing
a common navigation backstack

10
Android S/W Stack - Libraries
 Including a set of C/C++ libraries used by
components of the Android system
 Exposed to developers through the Android
application framework

11
Android S/W 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

12
Android S/W 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 such that a device can run
multiple VMs efficiently.
 Register-based virtual machine

13
Android S/W 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

14
Android S/W 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 H/W and the rest
of the S/W stack

Android is an open source software stack that includes an operating system, middleware, and key applications for mobile devices. It was developed by the Open Handset Alliance, a consortium of 47 technology companies to develop open standards for mobile devices. The Android software stack consists of applications, an application framework, libraries, and the Dalvik virtual machine runtime. At the lowest level, Android relies on the Linux kernel for core system services like memory management and security.

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