bn1 1020 demo android

Introduction to Android Learning

BN1020 – Demo PPT

Demo Android

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Agenda

1. Introduction

2. Prerequisites

3. Android Basics

4. Core Content

5. Advantages and Jobs availability

6. Queries

7. Conclusion

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Prerequisites :

•Core JAVA Concepts

•OOPs Concepts

•JDK Installation

•Android SDK Setup

•Eclipse or Android Studio

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Android is ?

Android is a mobile operating system (OS) based on the Linux

kernel and developed by Google.

Android Components

ActivityContent Provider

Broadcast ReceiverServiceIntent

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Android

•Activity: A screen with which users can interact in order to do something.

•Intent: Messaging objects which used to request to perform a given

action from other components.

•Service: Used to run long running background task and does not

provide user interface.

•Broadcast Receiver: It allows to register and listen for device broadcast

announcements.

•Content Provider: (Next slide)

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Content Provider

•

• What is Content Provider?

• What does it do?

• Why do we need this?

• When we should use?

• How can we use?

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ACTIVITY

Your Facebook Wall is an “ACTIVITY”. As you click on the Photo

Button, an “INTENT” is passed, that conveys the message and the

“CONTENT PROVIDER” (Photo Gallery) opens. The photo is

uploaded using a network upload “SERVICE”.

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Content provider

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Content providers are

•Content providers are Android’s central mechanism that enables

you to access data of other applications – mostly information stored

in databases or flat files.

•Content providers are the standard interface that connects data in

one process with code running in another process.

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Content Provider performs

•Content providers support the four basic operations, normally

called CRUD-operations. CRUD is the acronym for create, read, upd

ate and delete.

•Querying: Queries the Content Provider for all the objects, based

on the specified URI.

•Delete: Deletes the specified objects from the database of a Content

Provider.

•Update: Makes updates to the objects in the database.

•Insert: Inserts new object to the database.

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Cont..

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Needs of Content providers

•You do not need to develop your own provider if you want a private

database for a particular application (this database would not be

accessible to applications other than the one that created it).

•You however need a Custom provider to provide custom search

suggestions in your own application system.

•You would also need a Content Provider to copy and paste complex

data from your application to other applications.

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Content Providers available

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Content Provider structure

Content Provider

Application #1

Activity #1

Activity #2

Activity #3

Activity #1

Activity #1

Activity #2

Application #2

Database Files XMLRemote

connection …

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URI Permissions

Content URIs

• The most important concept to understand when dealing with content

providers is the content URI. Whenever you want to access data from a

content provider you have to specify a URI. URIs for content providers

look like this:

content://com.example.provider/articles

Scheme Authority Path

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SCHEME•The scheme for content providers is always “content”. The colon and

double-slash “://” are a fixed part of the URI-RFC and separate the scheme

from the authority.

•The next part is the authority for the content provider. Authorities have to

be unique for every content provider. Thus the naming conventions should

follow the Java package name rules. That is you should use the reversed do

main name of your organization plus a qualifier for each and every content

provider you publish.

•The third part, the optional path, is used to distinguish the kinds of data

your content provider offers.

•You can include another element i.e. the id(optional), which – if present –

must be numeric. The id is used whenever you want to access a single

record (e.g. a specific video file).

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Cursors

➢ Cursor is an interface that provides random read-write access to the result of

a database query from a content provider.

➢ A cursor is a collection of rows

➢ All field access methods are based on column number. You have to convert

column name to a column number first

➢ You can also find size / traverse result set easily.

Cursor cur;

for(cur.moveToFirst();!cur.isAfterLast();cur.moveToNext()) {

//access methods

}

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Android Market, Career & Jobs

•Android Development: A big career boost!!!

•Need for Android developers

with over 200K applications available on Google’s Android

Market, and more than 4.5 Billion downloads

•The average salary starts from Rs 15,000-Rs 18,000 per

month

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Questions ???

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