android level 1

Level 1 (beginner level) Dina Wasef

Overview

What is Android ??!! Android is an operating system designed for mobile

device based on linux kernel .

Led by google and owned by Open Handset Alliance.

.

Overview

WHY ANDROID ??!! Free & open platform (stack).

Give developper tool and libraries to make rich

appliccation.

Open for customization

Android market

History of Android

ANDROID SOFTWARE STACK

Android and Java

APK File

Dalvik executable This is the code that runs

your application.

Resources are everything that is not code.

(XML,images ,video,layouts ,...etc)

Native libraries (optionally)

INSTALLATION

Installing Eclipse http://www.eclipse.org/downloads/

Installing the Android SDK

Android Software Development Kit (SDK) is all you need to

develop android application

http://developer.android.com/sdk/installing.html

Sdk folder >>> tools>>> android

HELP >>> Install New Software >>> Add Http://dl-ssl.google.com/android/eclipse

Windows>>preferences>>android

HELLO WORLD New >> Android project

Mainfest.xml

res/layout/main.xml

Strings.xml

R.java

Hello world.java

MAIN BUILDING BLOCKS

Activity.

Intents.

Services.

Content providers.

Activity

Activity

Consider usually as asingle screen that user

see on device like text apps .

ex. website .

Each activity has its own cycle .

It is implemented as aclass .

When new screen opens prev.one

paused and put in history stack .

INTETS They are system msg running inside device

notifies apps for events, from hardware state to

incoming data

For android to move from screen to screen

called intent

You create your own intent object to launch aother

apps

service

It is the code that long lived and run

without UI

ex.media player apps & network

download

Media player Activity could start service

using Context.startservice() to run in

background to keep music going

ContetProvider

sharable data storage Enable data

sharing between apps

Simple interface with insert , update

Android development encourage

other apps to have data while

mainting complete control over data

how to get accessed

It is aclass the implement standard

set of methods

UI

Declarative

Programmatic

components

layout

Views

LAYOUTS

Linear layout

Frame layout

Absolute layout

Relative layout

Table layout

Linear layout

Relative layout