Android

What is Android

• Open Source and Linux-based  

     Operating System  for Mobile Devices

• Was developed by Open Handset Alliance , led by  Google and several other companies

• The first Beta version of Android was released in 2007 by Google.

Android Versions

Android Features

• Beautiful UI        =>        beautiful and intuitive
• Connectivity       =>        WIFI, bluetooth
• Storage              =>       SQLite is used
• Media Support   =>       png,jpg,gif
• Messaging         =>       sms, mms
• Web browser
• Multi-task
• Multi- language
• Resizable widgets

Android Application Components

• Complete Android application development is dependent on 4 components

•  Activity

- A single screen in the application with UI components - User is going to interact with the device through the Activity - Activity is a java file and an xml file

• Service

- A long running background process without any user interaction- WiFi status, Network status, Media player- Once you start the media player, it’ll start in background

• Broadcast Receiver

- Registered for system announcements
Eg: when headset is plugged in it is detected, charger connected, charger disconnected,

power button pressed

- Broadcast announcements are sent to the application with the help of broadcast receivers

• Content Provider

- Enable to share the data between two applications
Eg: WhatsApp can read the Contacts data,  since Contacts provide content providers

Android Environment Setup

• Java JDK5 or later version  with its environment variables set
• One of the Android IDE

                         -   Android Studio

                         -   Eclipse