28th May 2015, NED University

ANDROID DEVELOPMENT WORKSHOP

Daniel Muhammad Idrees

• Software Engineer - Interactive Health Solutions (www.ihsinformatics.com) (Dec 2013 – Present)

• Lead Android Trainer – SkillOrbit(www.skillorbit.com) (May 2015 – Present)

• Private Tutor and Trainer (Dec 2014 – Present)

• Internee - Open Integrated Solutions (May 2012 – Sept

2012)

• Computer & Information Systems Engineer (NED University, Batch 2009-10)

• O Levels Teacher (2009 – May 2015)Email: enggdaniyal@hotmail.com LinkedIn: www.linkedin.com/in/danielmidreesFacebook: www.facebook.com/daniel.mi

What to Expect?

• Guidance• Counseling• Mentorship

What not to Expect?

Spoon Feeding!

Variables• Data Types

o Primitive Typeso Non-primitive Types

• Local Variableso Choosing Data Typeo Declaring (String string;)o Initializing (string = “Hello”)

• Access Modifiers• Class (static) Variables• Instance (non-static) Variables

Primitive Data Types

Non-Primitive Data Types• User-created• Nullable• Also called “Reference Types”• Examples:

o Arrayso Stringo Lists

Access Modifiers• Access Modifiers

o Publico Privateo Protectedo Default

Operators

• Airthematic (+, -, *, /, ++, --, %)• Relational (==, >=, <=, !=, >, <)• Logical (&& , | |, !)

Controlling Flow of Execution

• Conditionso if – elseo switch

• Loopso foro while

• Special Control Statementso break, continueo Returno try-catch-finally

Function• Signatures• Naming• Parameters• Returning Values• Static/Non-static Functions• Calling Functions

Arrays• Arrays

o Collection of Similar Items in Sequenceo Contains values or referenceso Fixed, Finite Length

• Length• Index• Initialization• Enhanced for loop

Best Coding Practices

• Indentation

• Naming Convention• Use of Comments

Be an Engineer!Not a Mechanic!

Object Oriented Programming• Objects and Classes

o Object: Instance of a Classo Class: Blueprint of an Object

Pillars of OOP• Inheritance

• Polymorphismo Method Overloadingo Method Overriding

Pillars of OOP• Abstraction

o Biggest Challenge in OOPo Relevant Attributes and Behavioro Abstract and Concrete Classes

• Encapsulationo Hiding Datao Hiding Implementationo Access/Mutate (simply, get/set)

Interfaces• Why Not Multiple Inheritance?• Interfaces are Pure Abstract Classes• Rules

o No Instanceso No Constructorso Only Method Signatureso Only static final Members

Read more JAVA from:

• Java Actually by Khalid A. Mughal• The Complete Reference Java by Herbert Schildt• http://www.tutorialspoint.com/java/• http://www.javatpoint.com/java-tutorial

Take Help From:• Stackoverflow• Google!

Introduction to Android

Development

Manifest File<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.package.default" android:versionCode="1" android:versionName="1.0" >

<uses-sdk android:minSdkVersion="11" android:targetSdkVersion="21" />

<application> <activity android:name="com.resume.daniyalmuhammadidrees.MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application></manifest>

Strings.xml

<rescource

<string name="app_name">The name of your App!</string>

</resource>

@String/app_name “The name of your App!”

Layout.xml• Types of Layouts

o LinearLayouto RelativeLayouto TableLayouto GridLayouto FrameLayouto Fragment

• Views (Buttons, TextView, EditText etc)• ViewGroup (Invisible container, contains Views)

Width and Height of Views

android:layout_width="match_parent"android:layout_height="match_parent“

android:layout_width=“fill_parent"android:layout_height=“fill_parent“

android:layout_width=“wrap_content"android:layout_height=“wrap_content“

• wrap_content ( Take only as much as you need)• match_parent (Take everything you can )• fill_parent (Take as much as your parent have)

Accessing views through code

Activity Lifecycle• Activity• Lifecycle Methods

Orientation• Landscape and Portrait• Changing Orientation of Device• Emulator shortcut key ‘Left Ctrl + F11’• Setting fix Orientation of an Activity

More on UI• Padding

• Margin

• Gravity

• Weightsum

Weightsum = 3

Layout_weight (View)= 1

Linear Layout• Arrange views in a line vertically or horizontally. • Views can have Layout Weight and Layout

Gravity.

Relative Layout• Place views with respect to other view or Parent• Views inside RL does not have Layout Weight and

Layout Gravity.

Table Layout• Arrange views in rows and columns.• TableRow is MATCH_PARENT in width and

WRAP_CONTENT in height• <TableRows> (Views) </TableRows>• Columns in a row will be equal to number of

views in that row.

Grid Layout• Arrange views in rows and columns.• Available in API Level 14 and higher.• Set Row Count and Column Count.

Frame Layout• Views are stacked on top of each other.

ScrollView• ScrollView• HorizontalScrollView

• Events• Listener• Example of Button Click

Concept of Listener

Custom Button• Design an Image of a Button.

• Design an Image of a pressed Button.

• Create an xml file in drawable folder.

• Call that xml in your layout View.

http://angrytools.com/android/button/http://www.dibbus.com/2011/02/gradient-buttons-for-android/

Click

Click

Building Blocks of Android

• ActivitiesSomething which user interacts with.

• ServicesSomething that runs in the background.

• Broadcast ReceiversRespond to broadcast messages by

applications or the system itself.• Intents

Messenger carrying message.

• Used to start a new Activity• Used to start a Service• Used to get notifications from Broadcast

Receivers • <Intent-filter>• Explicit Intents (there is a target)• Implicit Intents (there is no SPECIFIC target)

Intents

Thank You!