Android App Development Getting Started Guide

Android Application Development Getting Started Ahsanul Karim [email_address] Sentinel Solutions Ltd. http://www.sentinelbd.com

General Course Outline ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],Setting up Development Environment ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],Setting up Development Environment(Contd.)

[object Object],Setting up Development Environment (Contd.) Download Link: http://www.java.com/en/download/index.jsp Download JDK from here and Install JDK

[object Object],Setting up Development Environment (Contd.) Download Link: http://eclipse.org/downloads/ Download the highlighted version of Eclipse IDE

[object Object],Setting up Development Environment (Contd.) Link: http://developer.android.com/sdk/index.html Download and Install the SDK starter package from the table above (Highlighted)

[object Object],Setting up Development Environment (Contd.) 1. Install available packages to get all SDK platform versions

[object Object],Setting up Development Environment (Contd.) 2. Installation progress

[object Object],Setting up Development Environment (Contd.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],Setting up Development Environment (Contd.) 4. Installing the ADT ,[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],Setting up Development Environment (Contd.) 5. Set SDK path ,[object Object],[object Object],[object Object],Development Environment Setup is now completed!

Let’s say “Hello” to the Android World! ,[object Object],[object Object],[object Object],[object Object],Now that our development environment is ready, we’ll build our first Android application.

Let’s say “Hello” to the Android World! (Contd.) 1. Start Eclipse and Go to File > New > Android Project 2. We keep project name “Hello World” (Since 1970 Ritchie’s book on C programming, programmers always say Hello World first) 3. Build Target “Android1.6” 4. Application name: “Hello World” 5. Package name: com.sentinelbd.hallo 6. Initial Activity Name: HalloActivity 7. Min SDK Version: 4 8. Click Finish Congratulations! You’ve just created your first Android application We’ll explain each input shortly

Let’s Go Deep… Created Project has the following structure Project Structure -Source ( src ) -Generated Class ( gen ) -Android 1.6 library -Assets ( assets ) -Resource( res ) - drawable-hdpi - drawable-ldpi - drawable-mdpi - layout - values - AndroidMenifest.xml - default.properties

Let’s Go Deep… (Contd.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],We’ll run the app in emulator for now

Let’s Go Deep… (Contd.) 1. Create AVD (Android Virtual Device) Use Android SDK & AVD Manager to create AVD

Let’s Go Deep… (Contd.) 2. Create Run Configuration ,[object Object],[object Object]

Let’s Go Deep… (Contd.) 3. Select AVD & Run Click Run to start AVD/emulator

Let’s Go Deep… (Contd.) Result in Emulator Now its time to analyze how it works

Project Structure… Created Project has the following structure Project Structure -Source ( src ) -Generated Class ( gen ) -Android 1.6 library -Assets ( assets ) -Resource( res ) - drawable-hdpi - drawable-ldpi - drawable-mdpi - layout - values - AndroidMenifest.xml - default.properties

Project Structure (Contd.) -Source ( src ) We have used only one class here which is an Activity named HalloActivity. We’ll describe about Activity in detail with lifecycle shortly. For now we can consider Activity as Android analogue for the window or dialog in a desktop application. It can load view from xml layout (here main.xml under res/layout folder) In the HelloActivity class the view of the Activity is set from main.xml given below

Project Structure (Contd.) -res/layout/main.xml ,[object Object],[object Object]

Project Structure (Contd.) -res/drawable ,[object Object],[object Object],-assets Holds other static files you wish packaged with the application for deployment onto the device. In this project, we have none -gen/R.java -values/strings.xml

Project Structure (Contd.) -AndroidMenifest.xml XML file describing the application being built and what components – activities, services, etc. – are being supplied by that application

Hmm.. No public static void main() ??? What is the Entry Point of an Android App? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],But how a request is made? What is the missing link?

Android App Development Getting Started Guide

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Android App Development Getting Started Guide