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Android and Project Structure. Android Android OS – Built on Linux Kernel – Phones – Netbooks – Readers – Other???

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Presentation on theme: "Android and Project Structure. Android Android OS – Built on Linux Kernel – Phones – Netbooks – Readers – Other???"— Presentation transcript:

1 Android and Project Structure

2 Android Android OS – Built on Linux Kernel – Phones – Netbooks – Readers – Other???

3 Android Dessert anyone? – Android 1.X 1.5 – Cupcake (first stable/robust version) 1.6 – Donut (first ‘updatable’ version) – Android 2.X 2.0 and 2.1 – Éclair Android 2.2 – Froyo Android 2.3 – Gingerbread – Android 3.X - Honeycomb – Android 4.X 4.0 – Ice Cream Sandwich 4.1, 4.2, and 4.3 – Jelly Bean

4 Android Versioning – Higher version addressed many issues Better audio/video Better sensing Use of GPS Multiple profiles per device Other

5 Android Android SDK ( – Windows, Linux, Mac – Utilizes the Java language Different Libraries Well-documented – – Freely downloaded

6 Android Dalvik Virtual Machine – Android’s equivalent of JVM – Optimized for low memory-management – Written by Dan Bornstein (named after a village where relatives lived) AVD – Android Virtual Device – Phone Emulation Communication between Android and AVD/phone – ADB (Android Debug Bridge) Allows access and control over emulators listing devices, installing applications, copy files to SD card, etc. – DDMS (Dalvik Debug Monitor Service) Communications with ADB to provide control – Telephony – Location – Other

7 Building Blocks of an Application Activities – User interface screen Each application can have multiple activities – Layout defined in.xml file – Functionality defined file Intents – Intention to perform a task Explicitly stated in code – Launch an activity – Display a webpage – Broadcast a notification

8 Building Blocks of an Application Services – Task that runs in the background Music Player RSS reader that updates an activity when a site is updated Content Providers – Bundles data so it can be shared among multiple applications

9 Building Blocks of an Application Resources – Images – Audio files – Constants – Stored in ‘res’ directory Permissions – Must explicitly ask permission to perform tasks Access web Access GPS Access Contacts

10 Project identification When creating a new project, the following must be provided – Project name Displayed in Eclipse to differentiate projects – Application name – Activity name The first screen displayed when the application is launched – Package name

11 Project components Automatically created – AndroidManifest.xml – Referenced libraries – Important directories gen (generated) res (resources) src (source)

12 Project components AndroidManifest.xml – Global settings Permissions Activities Intents Referenced libraries – android.jar – standard Android library – can add other user-defined libraries

13 Project components gen directory – Contains Automatically generated file Contains pointers to: – widgets – files – folders Never modified by programmer

14 Project components res directory – All file names within this folder (or subfolders) must be lowercase – Contains other folders drawable – Contains image files layout – Contains.xml layout files » Usually one for each activity – layout-land folder must be created for landscape-specific views values – Contains string pointers that can be used throughout the code

15 Project components src directory – Contains the java source code file for each activity –.java file for source code and the corresponding.xml file for layout often have the same name

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