Android development beginners faq

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Android Dev 101
June 23, 2012
Khirulnizam Abd Rahman

Agenda
 Intro
 Demo 1: New Android project
Properties window
Android Emulator
DDMS - Dalvik Debug Monitor
Demo 2: Widgets and Interactions

 Day 2 - 24-06-2013 (8.30am - 4pm)
Demo 3: HTML and Webview
Demo 4: Audio
 Demo 5: Video
Signing APK
 Uploading to Google Play

6/22/2012 http://blog.kerul.net 2

Android Devices


Android Story
 http://www.techsavys.info/2011/07/the-
android-story-an-android-infographic-
discussing-about-its-beginning-on-
going-changes-and-worldwide-market-
shares.html


Faq1: What is Android?
 Android is a software stack for mobile devices
that includes an operating system,
middleware and key applications (platform).
The Android SDK provides the tools and APIs
necessary to begin developing applications on
the Android platform using the Java
programming language.
 The kernel of most Android version is based
on Linux 2.6 (3.0 for ICS).
 Android architecture;


Android Architecture


Faq2: Who develop
Android?
 Initially developed by Andrew
(Andy) Rubin and his team in
Android Inc.
 Google acquired Android Inc.
in 2005.
 Now, it is developed by Google
under Andy Rubin (Senior Vice
President of Mobile)


Faq3: How many versions
(distributions) Android has?


 Source:
http://developer.android.com/resources/dashb
oard/platform-versions.html

Faq4: What is API Level?
 API Level is an integer value that uniquely
identifies the framework API revision offered
by a version of the Android platform.
 The Android platform provides a framework
API that applications can use to interact with
the underlying Android system.


Faq5: What is Android
app?
 Developer can develop application that runs
on top of Android.
 App is actually a simpler version of
application.
 Uses *.apk for the installer file extension.


App samples


Faq6: What is the language
used to develop Android
app?
 Java
 compiled into Dalvik Bytecode (NOTJava
bytecode).
 Android provides Dalvik virtual machine-
DVM inside Android (NOT Java virtual
machine-JVM)
 Using Android API – (with some Java
APIs).


Faq7: What is Dalvik Virtual
Machine, is it similar as JVM?
 Author - Dan Bornstein
 Dalvik VM implementing slightly different
architecture to JVM.
 Dalvik VM is a register-based
architecture.
 Being optimized for low memory and
slower processing speed.
 The VM was slimmed down to use less
space.


Faq8: What are tools needed
to develop Android App?
 Latest JDK – version 6 -
http://www.oracle.com/technetwork/java/javase/downl
oads/jdk-6u27-download-440405.html (not yet tested
against JDK 7)
 Eclipse (as the IDE) -
http://www.eclipse.org/downloads/packages/eclipse-
ide-java-developers/indigor
 Android Development Toolkit (ADT 12) for Eclipse -
http://developer.android.com/sdk/eclipse-adt.html
 Android SDK - http://developer.android.com/sdk/
 Installation guide - http://blog.kerul.net/2011/06/eclipse-
helios-android-development.html
 Third parties: Titanium, PhoneGap, Unity3D


IDE - Eclipse


AppInventor -
appinventor.mit.edu/


Emulator


Dalvik Debugger


Faq8: Where to distribute my
App?
 market.android.com
 MobileApps.com
 GetJar.com


Android Project Structure
 Inside Android Project, there should be;
/src – the Java codes are here
/gen – generated automatically
/assets – put your fonts, videos, sounds here
/res – images, layout and global variables
/drawable-hdpi –for high spec phones
/drawable-ldpi –for low spec phones
/drawable-mdpi –for medium spec phones
/layout – all XML file for the screen(s) layout
/values – global constant variables


AndroidManifest
 AndroidManifest.xml – app’s
permissions need to be registered here
– (eg: app can access Internet, phone
contacts, camera, etc must be
mentioned here)


<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
android:versionCode="7"
android:versionName="1.7"
package="net.kerul.mMathurat">

<application android:icon="@drawable/icon" android:label="@string/app_name"
android:taskAffinity=".mMathuratActivity">
<activity android:name=".mMathuratActivity"
android:label="@string/app_name"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".Aboutus" class=".Aboutus"
android:label="Mengenai kami..." android:screenOrientation="portrait">
</activity>
<activity android:name=".Berterusan" class=".Berterusan"
android:label="Mod pemanduan..." android:screenOrientation="portrait">
</activity>
</application>
<uses-sdk android:minSdkVersion="7" />
<receiver android:name=".DetectIncomingCall">
<intent-filter>
<action android:name="android.intent.action.PHONE_STATE" />
</intent-filter>
</receiver>

<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.VIBRATE"></uses-permission>
</manifest>


DEMO
 Demo 0: The IDE (Eclipse + ADT)
 Demo 1: Creating a new Android Project
(and the project structure).
 Demo 2: Widgets and interaction –
Textbox and Button.
 Demo 3: HTML and WebView
 Demo 4: APK and Distribution


TQvm

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Android development beginners faq

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