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Android for Java Developers

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Framework Overview <ul><li>http://developer.android.com/guide/basics/what-is-android.html </li></ul>

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Framework – Linux Kernel <ul><li>Core system services </li></ul><ul><li>Handles security, memory management, process management, network access, etc </li></ul><ul><li>Abstraction layer between OS and hardware </li></ul>

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Framework - Dalvik <ul><li>Virtual Machine </li></ul><ul><li>Optimized for mobile devices </li></ul><ul><li>Every app runs in its own instance of VM </li></ul><ul><li>Runs classes compiled by Java, and transformed into .dex files </li></ul>

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Framework - Libraries <ul><li>Variety of libraries to provide built in functionality. </li></ul>

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Framework – Application Framework <ul><li>Provides functionality to allow Applications to interact with underlying OS and other applications </li></ul><ul><li>Designed to simplify the reuse of components, and allow applications to publish, or make use of the capabilities of other applications </li></ul>

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Framework – Applications <ul><li>The layer where custom-built applications live. </li></ul><ul><li>This is the place where most mobile developers will interact with Android. Your App Here! </li></ul>

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Framework Overview

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Get Developer Tools <ul><li>SDK </li></ul><ul><ul><li>http://developer.android.com/sdk/index.html </li></ul></ul><ul><ul><li>Requires Java SDK (5.0 +) </li></ul></ul><ul><ul><li>Updating versions </li></ul></ul><ul><ul><li>What the different versions mean </li></ul></ul><ul><li>ADT Plugin (for Eclipse) </li></ul><ul><ul><li>http://developer.android.com/guide/developing/tools/adt.html </li></ul></ul><ul><ul><li>Need Eclipse Ganymede (3.4+) </li></ul></ul><ul><ul><li>Update site: https://dl-ssl.google.com/android/eclipse </li></ul></ul><ul><li>Can develop without Eclipse </li></ul>

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Developer Tools (cont ) <ul><li>Android command </li></ul><ul><li>Emulator </li></ul><ul><ul><li>Android Virtual Devices (AVD) </li></ul></ul><ul><li>Android Debug Bridge (ADB) </li></ul><ul><ul><li>Command line tool for interacting with phone/emulator. </li></ul></ul><ul><li>Dalvik Debug Monitor Server (DDMS) </li></ul><ul><ul><li>Debugging tool providing: screen capture, memory info, logging, info spoofing) </li></ul></ul><ul><li>http://developer.android.com/guide/developing/tools/index.html </li></ul>

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Developing an App <ul><li>Create a new project </li></ul><ul><ul><li>Project content overview </li></ul></ul><ul><li>Code </li></ul><ul><li>Test on emulator (or device) </li></ul><ul><li>Debug </li></ul><ul><li>Sign </li></ul><ul><li>Export to device </li></ul><ul><ul><li>As APK ( A ndroid P ac K age file) </li></ul></ul>

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Terminology <ul><ul><li>Most Commonly used elements </li></ul></ul><ul><ul><ul><li>Activity </li></ul></ul></ul><ul><ul><ul><li>Intent </li></ul></ul></ul><ul><ul><ul><li>Manifest file </li></ul></ul></ul><ul><ul><ul><li>Resources and Assets </li></ul></ul></ul><ul><ul><ul><li>Layout </li></ul></ul></ul>

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Terminology - Activity <ul><li>Activity – (Noun) A single screen, your application is made up of one or more of these. </li></ul><ul><ul><li>Always extends Activity </li></ul></ul>

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Terminology - Layout <ul><li>Layout – describes the UI of an activity </li></ul><ul><ul><li>Enables separation of UI from logic </li></ul></ul><ul><ul><li>There are a variety of layouts you can use including: Linear, Table, Relative, and Frame </li></ul></ul>

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Terminology - Intent <ul><li>Intent – (Verb) code to perform an action </li></ul><ul><ul><li>Wiring between activities, services, broadcast receivers, or other functions </li></ul></ul><ul><ul><li>facility for late run-time binding between components in the same or different applications </li></ul></ul>

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Terminology - Resources <ul><li>Resource – text, pictures, sound, etc </li></ul><ul><ul><li>are all abstracted from the code and logic </li></ul></ul><ul><ul><li>compiled and managed by system generated R.class file </li></ul></ul><ul><ul><li>Instantiate by getting reference to object </li></ul></ul>

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Terminology - Manifest <ul><li>Manifest File – describes your app </li></ul><ul><ul><li>always named AndroidManifest.xml </li></ul></ul><ul><ul><li>declares the components of an application, describes security permissions required by the app, and lists required library dependencies </li></ul></ul>

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Terminology – cont. <ul><ul><li>Other important elements </li></ul></ul><ul><ul><ul><li>Widget </li></ul></ul></ul><ul><ul><ul><li>Service </li></ul></ul></ul><ul><ul><ul><li>Broadcast Receiver </li></ul></ul></ul><ul><ul><ul><li>Security and Permission </li></ul></ul></ul><ul><ul><ul><li>Content Provider </li></ul></ul></ul>

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Learn More <ul><li>http://developer.android.com </li></ul><ul><li>Phoenix Android Users Group </li></ul><ul><ul><li>http://groups.google.com/group/phoenix-android </li></ul></ul><ul><li>http://forum.xda-developers.com </li></ul><ul><li>http://www.openintents.org </li></ul><ul><li>http://www.anddev.org </li></ul><ul><li>Google Groups (Forums) </li></ul>

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Questions? <ul><li>Follow me on twitter: @mikewolfson </li></ul>