Android is an open-source software platform and Linux-based operating system initially developed by Andy Rubin and acquired by Google. It is supported by the Open Handset Alliance, which aims to promote the use of Android standards and services. Android Studio is the official IDE for Android development, featuring tools for building apps across different device configurations.

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2. What is Android?
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3. Android is an Open Software
platform and Linux based
operating system.
It is open source under Apache
License version 2.0
It is developed by Andy Rubin of
Android Incorporation then
acquired by GOOGLE and later
the OHA.
Applications are usually
developed in Java programming
language using the
Android software development
kit (SDK), but other development
environments are also available.
The goal of android project is to
create a successful real- world
product that improves the
mobile experience for end users.
BASE
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4. OPEN HANDSET ALLIANCE
(OHA)
It is a consortium of 84 companies which was established on 5th November 2007, led by GOOGLE.
It is committed to advance open standards, provide services and deploy handsets using the
android platform.
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Features Of Android
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6. API Level is an integer value that uniquely identifies the framework API revision
offered by a version of the Android platform.
Version
CODE NAME
• O
• Nougat
• Marshmallow
• Lollipop
• KitKat
• Jelly Bean
VERSION
• 8.0
• 7.0 – 7.1.2
• 6.0 – 6.0.1
• 5.0 – 5.1.1
• 4.4 – 4.4.4
• 4.1 – 4.3.1
API Level
• 26
• 24 – 25
• 23
• 21 – 22
• 19 – 20
• 16 - 18

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ARCHITECTURE
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8. Why Android
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Android Studio is the official integrated development environment (IDE) for Google's Android operating system, built
based on JetBrains' IntelliJ IDEA software and designed specifically for Android development.
The following features are introduced in it-
• Gradle-based build support
• Android-specific refactoring and quick fixes
• Lint tools to catch performance, usability, version compatibility and other problems
• ProGuard integration and app-signing capabilities
• Template-based wizards to create common Android designs and components
• A rich layout editor that allows users to drag-and-drop UI components, option to preview layouts on multiple screen
configurations.
• Support for building Android Wear apps
• Built-in support for Google Cloud Platform, enabling integration with Firebase Cloud Messaging (Earlier 'Google
Cloud Messaging') and Google App Engine.
• Android Virtual Device (Emulator) to run and debug apps

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11. called when activity is first created.
2. onStart: called when activity is becoming
visible to the user.
called when activity will start
interacting with the user.
called when activity is not visible to
the user.
5. onStop: called when activity is no longer visible
to the user.
6. onRestart: called after your activity is stopped,
prior to start.
7. onDestrory: called before the activity is
destroyed. 11

12. FACT
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