Android Programming Beomjoo Seo seobjcomp nus edu sg

Android Programming Beomjoo Seo (seobj@comp. nus. edu. sg) Sep. , 12 CS 5248 Fall 2012

Contents • Installation • Example by a sample app, “Hello, CS 5284” – Create an Android Project – Building and Running – Debugging • General Topics – Fundamental Components • Activity, Service, Content Providers, and Broadcast Receiver – – Activity, Intent UI : Layout, Menu Thread Misc: Media Recorder, HTTP Post, MP 4 Parser • Sample Application http: //developer. android. com/guide/index. htm l

Installation Procedure http: //developer. android. com/index. html • Install JDK 5 or JDK 6 • Install Eclipse IDE – Eclipse 3. 5 or above Eclipse IDE for Java (EE) Developers • Eclipse JDT plugin – Run Android SDK starter package – Install ADT plugin (ADT 20. 0. 3) • Eclipse > Help > Install New Software … -> Add – https: //dl-ssl. google. com/android/eclipse/ • Configure ADT plugin

Install SDK Packages • From Android SDK and AVD Manager Via console OR via eclipse

SDK Version Mapping Convention • Android 4. 0. 3 Platform – SDK Tools, Revision 20 – API Level: 15

Eclipse ADT Plugin Configuration At Windows Specify Android SDK location > Preferences > Android Increase ADT connection time out

Creating a Sample App, “Hello, CS 5248”

Eclipse > New > Android Project

Main Activity Class

Graphical Layout Editor Update ADT plugin !!!

XML Layout File

Value Resources - Strings. xml

R. java

The Manifest file

Default. properties

Building App

Building Process Running

No Android Device ? Install USB Driver !!!

USB Driver Installation 1. Install OEM USB Driver from ASUS website. http: //support. asus. com/download/ and search by Transformer 2. Update Driver Software from Device Manager Update Driver software 3. Locate USB Driver folder 4. Enable USB Debugging at Transformer

Enabling USB debugging OR

After Successful USB Driver Installation <sdk>/tools/ddms. bat OR

Running Sample App.

Sample Hello World Code

Editing Sample Code Add id to main. xml “@+id/hello. Id” Edit Hello. World. Activity. java BE PATIENT Since Eclipse may not be responsive for a long time !!!

Let’s Debug the code

A Sample Code

App Failure

Always, Look at DDMS !!!

Correction

Debugging via Dalvik Debug Monitor (ddms) Log. e("Hello, World", "Hello, BJ");

Now, everything is ready

Application Components • Android application –. apk : android package • Four Application Components – Activity • A single screen with a user interface – Service • A background processing unit with no user interface – Content Provider – Broadcast Receiver • Communication among components except Content Provider – Intent

Activity 1 • Activity Lifecycle • Implement Lifecycle Callbacks

Activity 2 • Hierarchical View Architecture – View. Group (Layout) • View. Group (Layout) – View – … • View. Group – … • Declare Activity in the manifest

Activity 3 • Start an Activity for a Result – Caller Activity – Callee Activity • finish • Activities and Stack

UI – Declaring Layout • Initiated when called set. Content. View() on on. Create() • Use Visual Layout Editor for initial layout design. • Edit XML file extensively. wrap_content or fill_parent

UI – Creating Menu • Menu Types – Options Menu • Appears when a user touches MENU button. – Context Menu – Submenu • How to – Specify menu items in a XML resource menu – Inflate a Menu Resource – Respond to user Action At res/menu/game_menu. xml inflate callback

UI – Handling UI Events • on. Click, on. Long. Click, on. Key, on. Touch, …

Thread • UI Thread – “Main” thread per application responsible for interacting with UI components. • “Application Not Responding” problem – If UI thread is blocked more than several seconds, ANR dialog appears. – Do not block the UI thread – Do not access UI components outside UI thread. modify

Use Async. Task, Instead

Misc - Media Recorder • Modify Camera. Preview to see the video during recording.

Misc - HTTP Post • Use Http. Client and Http. Post. • Use “multi-part/form-data” to encapsulate segment. • Do not allocate memory excessively.

Misc - Integration with MP 4 Parser • Adding a jar file – Create its jar file. – Add jar file to the app. • Build Path > Configure Build Path > Libraries > Add JARs. • If you include source files directly, – Put Isoparser-default. properties to assets folder – Change get. Resource. As. Stream(“isoparserdefault. properties”) in Property. Box. Parser. Impl to “/assets/isoparser-default. properties”.

Misc - Connecting to NUS Wifi

Misc – Permission Issue • Add following permissions to the manifest file.

Sample Implementation Main. Activity Option menu Context menu Record Upload Item Click Preview Item Click Record. Activity Upload Service Record Button Click Player. Activity

Final Comment: Use Api. Demo !!!