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Android Basics
Jun 22, 2015
Basics of Android. For the session given at home!!
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Why Android?
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Why Android?
●Fastest Growing mobile OS.●1.5 billion apps & games downloaded every month.
●1 million new Android devices every day.
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Why Android?
●70% market share world wide.
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Android app Building Blocks
ActivitiesServices
4 App Components
Content Providers
BroadCast ReceiversFanzy.in
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The Manifest File
Intents
Views
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Activities
● An activity represents a single screen with a UI.
● App => Multiple activities.
● 1 Activity is declared main.
Activity Lifecycle
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Activity
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Views
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● Basic Building blocks of UI.
● A View responsible for drawing & event handling.
● Organized as Trees
● XML in resources.
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Action Bar
Tabs
List View
Text View
Image View
Image Button
Intents
● Asynchronous message.● Move from One activity to another.● Launch Activities, Services, Send
BroadCasts.● Communicate between
Applications.
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Intents
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Intents
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Services● Long running operations in the
background.● No User Interface.● Network Transactions, Music, file
Upload etc.
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Content Providers
● Manages a shared set of app data.● Standard interface for Storing &
retrieving data.● Data can be stored in file system,
SQLite database, web etc.● Contacts, Calendar etc.,
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Broadcast receivers
● Component that responds to system-wide broadcast announcements
● Battery Low.● Location Change.● Call received etc.● Apps can also initiate broacasts.
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AndroidManifest file
● One file to rule them all.● Declare all your components.● User permissions.● Hardware & software features.
And more.● It is an XML file.
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Notifications
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● Notification Area.● Notification
Drawer.● Example:
Whatsapp message, Alarm
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Dev Environment:Eclipse
EmulatorUI Editor
Other important concepts
● Fragments● Resources
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APK (exe file for Android)
● Android Application Package file● Signed or Unsigned.● Progaurd for obfuscation.
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More things:
● Debugging● Connecting your phone.● Uploading to Google play.●
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