Android Development

Jarrell Waggoner

Resources

Slides: www.malloc47.com/android-intro-slides
Code: github.com/malloc47/android-intro-workshop

App Inventor

App Inventor

http://appinventor.mit.edu

Android vs. IOS

Companies

Apple vs. Google

Language

Java

Objective-C

Price

$25 one-time vs. $99 annually

75% profits

Platform

Any platform vs. Mac Only

Market Share

Details

Comparison

About Android

Android

First release: 2008
Based on the Linux kernel
Dalvik instead of JVM
Over 200,000 apps with over 3 billions downloads

Versions

Cupcake
Donut
Eclair
Froyo
Gingerbread
Honeycomb
Ice Cream Sandwich
Jelly Bean

Architecture

Building an App

Cat

Requirements

Windows, Mac, or Linux
Java JDK
Android SDK
Eclipse (classic)
ADT Plugin for Eclipse
An Android API (15 or above)
Installed through the Android SDK Manager

Development Overview

Organization

Intent
- Activity
  - ViewGroup
    - View

Intents

Sends messages between activities, and selects the appropriate activity

Activity

View and ViewGroup

View

Interactive controls that appear in an app

Types of Views:

TextView
EditText
Button
CheckBox
RadioButton

ViewGroup

Collection of Views, which handle the layout of controls in an activity

Types of ViewGroups:

AbsoluteLayout
FrameLayout
LinearLayout
RelativeLayout
TableLayout

View and ViewGroup

Files

AndroidManifest.xml: Registers Activities
BuildConfig.java: Global variables which control how the project is built
R.java: Maps unique numbers to named constants
MainActivity.java: Code for activity
(name varies)
activity_main.xml: xml description of layout
(name varies)

Hands-On

Cat