Android Fundamentals Basic Concept

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Fundamentals

• Android Applications are Collections of reusable components.

• An Android App may have multiple entry points, and may use components

from other applications.

• In Android, the flow of user interaction across one or more applications is

called a “Task.”

Task

• A user views a list of messages in a Messaging App

• They tap a message on the list to view that particular message

• They then tap [View Contact], which opens the Contacts App

• Then they call the contact, which opens the Phone App.

• The user views all of this as a Single Task, even though it spans multiple

applications.

Android Building Blocks

• Activity

• Service

• Content Provider

• Broadcast Receiver

Android Building Blocks

Activity

A unit of User Interface interaction.

Service

A background task that may be active but is not visible on the screen.

Broadcast Receiver

performs an action in response to a message (Intent) from some other

component.

Android Building Blocks

Content Provider

An object used to work with data.

Exposes methods to create, read, update, and delete data.

Accessed via a URI.

Analogous to a RESTful web service.

Android Intent

• An Intent is an object that describes some “function” that one activity requests

some other activity to perform.

• Android App can describe multiple intents, the system is responsible for

finding Activities that match each intent.

• Android activities are “loosely coupled” and they are joined by Intents.

Android Intent

• A Activity is registered themselves to respond to several intents.

• An activity in an app can respond to an Intent sent from some other android

app.

• Unlike traditional Android applications tasks are controlled via Intents

(messages from one component to another) don’t need callback methods to

control the program flow.

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