Android Workshop Day 3

3-Day Workshop on AndroidProgramming

Electronic Engineering DepartmentMohammad Ali Jinnah

University(MAJU), Islamabad

Kashif Sardar

Workshop Outline

2

Day 1– Mobile App

development– Android Platform

Architecture– Development

environment setup

– Application execution

– Hello World Application

– User Interface Designing

Day 2– User Interface

Designing Cont…– Activities and

Intents– Permissions– Fragment Classes– Debugging– Accessing Android

Hardware

Day 3– Fragment Classes– Accessing Android

Hardware– Databases and

Content Provider– Map, Geo Coding

and Locations– Deployment– Closing Ceremony

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Fragment Classes

3

Tablets have larger displays than phones do

They can support multiple UI panes / user behaviors at the same time

The 1 activity – 1 thing the user can do heuristic may not work for larger

devices

Quote Viewer Application

Application uses two Activities

Ones shows titles of Shakespeare plays & allows user to select one title

The other shows a quote from selected play

This layout is reasonable on a phone But inefficient on a larger device

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Fragment Classes

4

Tablets have larger displays than phones do

They can support multiple UI panes / user behaviors at the same time

The 1 activity – 1 thing the user can do heuristic may not work for larger

devices

Quote Viewer Application

Application uses two Activities

Ones shows titles of Shakespeare plays & allows user to select one title

The other shows a quote from selected play

This layout is reasonable on a phone But inefficient on a larger device

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Fragment Classes

Represents a behavior / portion of UI within an Activity

Multiple Fragments can be embedded in an Activity to create a multi-pane

UI

A single Fragment can be reused across multiple Activities

Fragments In Action

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Fragment Classes In Action

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Accessing Android Hardware-Camera These are the following two ways , in which you can use camera in

your application

1. Using existing android camera application in our application

2. Directly using Camera API provided by android in our application

set of permissions and features in the AndroidManifest.xml

Using existing android camera application in our application

Let See in action and explore the code

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Camera in Action

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Databases In Android

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Shared Preferences

Small amounts of primitive data

A persistent map Holds key-value pairs of simple data types

Automatically persisted across

application sessions

Often used for long-term storage of customizable application data

Account name

Favorite WiFi networks

User customizations

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File

Class represents a file system entity identified by a pathname

Storage areas are classified as internal or external

Internal memory usually used for smaller, application private data sets

External memory usually used for larger, non-private data sets

File API

FileOutputStream

openFileOutput(String name, intmode)

Open private file for writing. Creates the file if it doesn't

already exist

FileInputStream

openFileInput(String name)

Open private file for reading

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SQLite Databases

Android provides structured data persistence through a combination

of SQLite databases and Co

Using SQLite you can create fully encapsulated relational databases for

your applications. Use them to store and manage complex, structured

application data.

Android databases are stored in the

/data/data/<package_name>/databases folder on your device (or

emulator).

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SQLite Databases Cont..

SQLiteis a well-regarded relational database management system

(RDBMS). It is:

Open-source

Standards-compliant

Lightweight

Single-tier

It has been implemented as a compact C library that’s included as part

of the Android software stack

Why This?

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Content Providers Represents a repository of structured data

Encapsulates data sets

Enforces data access permissions

Content Providers provide an interface for publishing and consuming

data, based around a simple URI addressing model using the

content://schema.

They enable you to decouple your application layers from the

underlying data layers, making your applications data-source agnostic

by abstracting the underlying data source.

Intended for inter-application data sharing

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Content Providers Format content://authority/path/id

content – scheme indicating data that is managed by a content

provider

authority – id for the content provider

path – 0 or more segments indicating the type of data to be accessed

id – a specific record being requested

Example:

ContactsContract.Contacts.CONTENT_URI=“content://com.android.contacts/contacts/”

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Content Providers Examples Browser – bookmarks, history

Call log- telephone usage

Contacts – contact data

Media – media database

UserDictionary– database for predictive spelling

Many more

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Maps, Geo-coding, and Location-Based Services

“Location-based services” is an umbrella term that describes the

different technologies you can use to find a device’s current location.

Mobile applications can benefit from being location-aware

Allow applications to determine & manipulate location

Find stores near the user’s current location

Direct a user from a current to a particular store

Define a geofence

Initiate action when user enters or

exits the geofence

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Location

Represents a position on the Earth A Location instance consists of:

Latitude, longitude, timestamp and,

optionally, accuracy, altitude, speed,

and bearing

Location Providers

Represents a location data source

Actual data may come from

GPS satellites

Cell phone towers or WiFiaccess points

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Location Manager

Determine the last known user location

Register for location updates

Register to receive Intents when the device nears or moves away

from a given geographic area

Location Listeners

Defines callback methods that are

called when Location or LocationProvider status changes

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Signing and publishing applications (deployment)

Android package files (.APK).

During development, your applications will be signed using a debug

key that is automatically generated by the ADT tools.

The JDK includes the Keytooland Jarsignercommand-line tools

necessary to create a new keystore/signing certificate, and to sign your

APK, respectively.

Alternatively, you can use the Export Android Application wizard

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Signing Applications Using the Export Android Application Wizard

To launch the wizard, open the Package Explorer and select File then

Export,

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Open the Android folder, select Export Android Application, and then

click Next.

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Click Next.

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The Keystore selection screen provides the option either to use an

existing keystore file, or to generate a new file.

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The next step is to generate a new private key which will be used to sign the application

package. Once the information has been entered, click on the Next button to proceed

with the package creation.

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Final step Press Finish

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When you Press Finish following output will shown on console window

Now go to the location which you select for your key see what happen two files are

created

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Useful Links

• Android Resources• https://developer.android.com/training/index.html

• https://developer.android.com/sdk/index.html

• https://developer.android.com/guide/index.html

• Workshop Material

• https://www.dropbox.com/sh/ndvr9ls34mhxd4h/xilbzNPSL3

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Documents

Android Workshop Day 3