Android a brief intro

Android An intro to the open platform!

Who?  Kieran Gutteridge  @kgutteridge  Developing for mobile devices since 2002

Android  Open handset alliance  http://developer.android.com  Based on Linux 2.6  Android allows Java developers far lower access to the phone than was possible in J2ME, ie 0870

Open Handset Alliance

Why Android? Cost Android Low iPhone J2ME High Wimo Symbian Difficult Easy

Appstores  Android app market – Self certification, this works on the internet! – No approvals – Piracy is a problem as with others – Payments not rolled out across all countries  Alternatives – Self distribution – other app stores

Penetration of versions  http://developer.android.com/resources/dashboard/ platform-versions.html

Architecture

Android Code • Highly optimized VM, compiled byte is optimized for mobile devices • End result is NOT the same byte code as Java, o dx in the sdk takes compiled Java class files and converts them into .dex • No JIT until Froyo 2.2 • Built with security and performances (battery life) in mind

Tools • SDK o Available at http://developer.android.com/sdk/index.html • Eclipse o 3.3(Europa) or 3.4 (Ganymede) • Eclipse Plugin o XP,Vista, Linux, x86 Mac 10.4.8 or later o http://developer.android.com/sdk/eclipse-adt.html • Leave the emulator running! o Exact opposite to J2ME and BREW, your app will be deployed each subsequent run or debug

What makes an app  APK file  One of more activities (can be a headless)  AndroidManifest.xml  Views think Swing/LWUIT  Layouts xml based editor  What makes Android great  intents  contentproviders  notifcations

Defaults - what defaults

Top tips  Async task  http://developer.android.com/reference/android/os/AsyncTask.html  Draw 9 Patch  http://developer.android.com/guide/developing/tools/draw9patch.html  Toast  http://developer.android.com/reference/android/widget/Toast.html  Webkit  http://developer.android.com/reference/android/webkit/package-summary.html

Optimisation • Creation of Objects • Strings are objects! • Use of static and final • Getters and setters • Field lookups in larger loops • Fixed point rather than floats • Multi Dimensional Arrays

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Android a brief intro

by kgutteridge on Jul 21, 2010

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