Introduction to Android Development

Mobile Innovations
Prof. Erwin M. Globio, MSIT

APP–Market Fit
PLATFORM (Android, Bada, Java, Symbian, Maemo, Blackberry; phone exclusive or open)
PHONE BRAND (Samsung, Nokia, Sony, LG, BB, ?)
PHONE TYPE (Feature phone, Smartphone)
TELCO
PLANS (variability of cost structures: voice ; text; data per-kb, per-hr)
USERS (who, using which phone, on which telco or plan?)

Criteria for Good Apps
Well-defined target market; (link to intangible qualities)
Functionality: runs successfully and with ease on Android mobile phones, does what it’s supposed to do;
Uniqueness in its application; doing something out of the common
Creativity in design and in the use of available technologies( UI, graphics, etc)
Usefulness in addressing users’ needs and problems, with high potential for adoption by customers
Usability, interface and navigation designed for ease and comfort of user
Platform and modular design.

Intangible Qualities of Good Products
What is its magnet – why will it attract the user?
What is its anchor – what will hold the user to it?
Does it have a profit engine for the user – will it make the relationship pay?
How is it spiced it up to make for a satisfying customer experience?

Business Models
Sale of app
Share of telco billings (voice, text, data)
Subscription (per-use, per month)
% of sales
Sponsorship or ads
(Paid web hosting – service provider or cloud)

Introduction to Android Development
Full of potential to be utilized

Topics to be discussed...
Introduction to the Android Platform
Overview of the Android SDK in Eclipse
Working with the User Interface
Working with Data Storage
Sharing information between applications
Networking
Advance phone features
Publishing applications
Best Practices

Topics to be discussed...
Introduction to the Android Platform
Overview of the Android SDK in Eclipse
Working with the User Interface

What is Android?
Android is a software stack for mobile devices that includes an operating system, middleware and key applications.

What are the features of Android?
Application framework
Dalvik virtual machine
Integrated browser
Optimized graphics
SQLite
Media support
GSM Telephony
Bluetooth, EDGE, 3G, and WiFi
Camera, GPS, compass, and accelerometer
Rich development environment

Android Architecture

Working with Android Development Tools (ADT)
The Android Development Tools (ADT) plugin for Eclipse adds powerful extensions to the Eclipse integrated development environment.
It gives you access to other Android development tools from inside the Eclipse IDE.
It provides a New Project Wizard It automates and simplifies the process of building your Android application.
It provides an Android code editor that helps you write valid XML for your Android manifest and resource files.
It will even export your project into a signed APK, which can be distributed to users.

Installing ADT
To install in Eclipse 3.5 (Galileo)
Start Eclipse, then select Help> Install New Software
In the Available Software dialog, click Add....
In the Add Site dialog that appears, enter a name for the remote site (for example, "Android Plugin") in the "Name" field.
Enter location https://dl-ssl.google.com/android/eclipse/
Back in the Available Software view, you should now see "Developer Tools" added to the list. Select the checkbox next to Developer Tools, which will automatically select the nested tools Android DDMS and Android Development Tools. Click Next.
In the resulting Install Details dialog, the Android DDMS and Android Development Tools features are listed. Click Nextto read and accept the license agreement and install any dependencies, then click Finish.
Restart Eclipse.

What do you get?

Working with Eclipse (New Project)

Working with Eclipse (New AVD)

Application Fundamentals
Applications are written using Java
The Android Asset Packaging Tool generates apk (Android Package) files containing the code and any data and resources needed
Each application runs in its own Linux process
Each application has its own VM
Each application has its own user id, permissions are set accordingly

Application Components
A central feature of Android is that one application can make use of elements of other applications (provided those applications permit it)
Android applications don't have a single entry point for everything in the application (no main() function, for example)
They have essential components that the system can instantiate and run as needed

Application Components
Activities - An activity presents a visual user interface for one focused endeavor the user can undertake.
Services - A service doesn't have a visual user interface, but rather runs in the background for an indefinite period of time.
Broadcast Receivers - A broadcast receiver is a component that does nothing but receive and react to broadcast announcements
Content Providers - A content provider makes a specific set of the application's data available to other applications. The data can be stored in the file system, in an SQLite database, or in any other manner that makes sense.
Intent - An intent is an Intent object that holds the content of the message

Let’s create our first application

The Application Manifest

Looking at the project (Strings.xml)

Looking at the project Layout(main.xml)

Looking at the project (main.java)

Starting with an Activity
The main starting point of most applications
There is no concept of “main” program
Each activity can be executed or invoked at any time
One application can have multiple “activities”
An example of acrivity would be “Searching for an application in the store”
An Activity can have several “Views” or “View Groups” to define its user inteface.

Activity Lifecycle

Activity Source
package org.feueac.android;
import android.app.Activity;
import android.os.Bundle;
publicclass Main extends Activity {
@Override
publicvoid onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}

What is R.layout.main?
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
</LinearLayout>

Views in an Activity
The user interface is built using View and ViewGroup objects
Basic units of user interface expression on the Android platform
View class serves as the base for subclasses
ViewGroupclass serves as the base for subclasses called "layouts"

View Hierarchy
Activity must call the setContentView()

The different layouts
Linear Layout
Relative Layout
Table Layout
Grid View
Tab Layout
List View

Handling Events in an Activity
public class main extends Activity implements OnClickListener
Button myButton = (Button) findViewById(R.id.hello_button);myButton.setOnClickListener(this);
@Overridepublic void onClick(View v) {}

Thank you!

Introduction to Android Development

by Prof. Erwin Globio

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