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Google Android as a mobile development platform

Google Android as a mobile development platform. T-110.7111 Internet Technologies for Mobile Computing Olli Mäkinen. Google Android. Google’s own mobile operating system based on Linux Open source with all primary components published

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Google Android as a mobile development platform

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  1. Google Android as a mobile development platform T-110.7111 Internet Technologies for Mobile Computing OlliMäkinen

  2. Google Android • Google’s own mobile operating system based on Linux • Open source with all primary components published • Google still has some closed-source applications running on top (such as GPS navigation and the application store) • Manufacturers are open to make their own adjustments to the OS without the requirement of publishing them as open source

  3. Android System Architecture Source: Google

  4. Third Party Software • Android spawns a Dalvik virtual machine for each application, including third party ones • This enables strong control of the application’s behaviour and also helps with misbehaving applications • Multi-tasking is available • An application framework provides a vast range of components that can be used in the applications • Third parties can also install additional components that can be used in other software • Signing is mandatory for distribution of the applications (self-signing is possible too) • Android Market is available quite openly ($25 one-time fee plus a 30% royalty for Google)

  5. Android Development • Java based, but is not compliant with J2ME (Micro Edition) or J2SE (Standard Edition) • Hardware features are available through Java APIs • SDK is available on Windows, OS X and Linux machines • The SDK includes an emulator for different Android device versions (up to 2.1 currently) • Plug-in (Android Development Tools, ADT) available for Eclipse • Debugging is easy with the plug-in

  6. Application Framework • View System • Contains GUI elements, with XML-based layouts • Content Providers • Provides interchangeable data between applications, such as contact lists • Resource Manager • Separate data storage for language files, graphics and layout data • Notification Manager • Allows applications to add alerts, such as status bar messages, sound or vibration • Activity Manager • Controls the lifecycle of the applications

  7. A Typical Android Application • Activity • Java code • At least one needs to be specified • Each has its own view(s) • Resources • Text strings, image files or other data • Views • XML-based GUI • A view is one component, a view group contains many views • Several different layout options = view groups • Standardized components (buttons, input fields) = views • R class • Generated based on the GUI and resources • Event listeners for the components created into the Activity • A menu can be added for settings, created automatically

  8. Links • http://www.xtensivearts.com/2009/07/27/episode-4-checkboxes-complex-layouts/ • http://developer.android.com/sdk/index.html

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