Android™ Application Development - Bahar Ali Khan

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Chapter 11: Advanced Android <strong>Development</strong> 360 } }; String link = c.getString(EarthquakeProvider.LINK_COLUMN); double magnitude = c.getDouble(EarthquakeProvider.MAGNITUDE_COLUMN); long datems = c.getLong(EarthquakeProvider.DATE_COLUMN); Date date = new Date(datems); result.add(new Quake(date, details, location, magnitude, link)); } while(c.moveToNext()); return result; There are several considerations when implementing these methods: ❑ ❑ All exceptions will remain local to the implementing process; they will not be propagated to the calling application. All IPC calls are synchronous. If you know that the process is likely to be time-consuming, you should consider wrapping the synchronous call in an asynchronous wrapper or moving the processing on the receiver side onto a background thread. With the functionality implemented, you need to expose this interface to client applications. Expose the IPC-enabled Service interface by overriding the onBind method within our service implementation to return an instance of the interface. The code snippet below demonstrates the onBind implementation for the EarthquakeService: @Override public IBinder onBind(Intent intent) { return myEarthquakeServiceStub; } To use the IPC Service from within an Activity, you must bind it as shown in the following code snippet taken from the Earthquake Activity: IEarthquakeService earthquakeService = null; private void bindService() { bindService(new Intent(IEarthquakeService.class.getName()), serviceConnection, Context.BIND_AUTO_CREATE); } private ServiceConnection serviceConnection = new ServiceConnection() { public void onServiceConnected(ComponentName className, IBinder service) { earthquakeService = IEarthquakeService.Stub.asInterface(service); } public void onServiceDisconnected(ComponentName className) {
} }; earthquakeService = null; Using Internet Services Chapter 11: Advanced Android <strong>Development</strong> Software as a service, or cloud computing, is becoming increasingly popular as companies try to reduce the cost overheads associated with installation, upgrades, and maintenance of deployed software. The result is a range of rich Internet services with which you can build thin mobile applications that enrich online services with the personalization available from your mobile. The idea of using a middle tier to reduce client-side load is not a novel one, and happily there are many Internet-based options to supply your applications with the level of service you need. The sheer volume of Internet services available makes it impossible to list them all here (let alone look at them in any detail), but the following list shows some of the more mature and interesting Internet services currently available: ❑ Google’s gData Services As well as the native Google applications, Google offers Web APIs for access to their calendar, spreadsheet, Blogger, and Picasaweb platforms. These APIs collectively make use of Google’s standardized gData framework, a form of Read/Write XML data communication. ❑ Yahoo! Pipes Yahoo! Pipes offers a graphical web-based approach to XML feed manipulation. Using pipes, you can fi lter, aggregate, analyze, and otherwise manipulate XML feeds and output them in a variety of formats to be consumed by your applications. ❑ The Google App Engine Using the Google App Engine, you can create cloud-hosted web services that shift complex processing away from your mobile client. Doing so reduces the load on your system resources but comes at the price of Internet-connection dependency. ❑ Amazon Web Services Amazon offers a range of cloud-based services, including a rich API for accessing its media database of books, CDs, and DVDs. Amazon also offers a distributed storage solution (S3) and an elastic compute cloud (EC2). Building Rich User Interfaces Mobile phone User Interfaces have improved dramatically in recent years, thanks not least of all to the iPhone’s innovative take on mobile UI. In this section, you’ll learn how to use more advanced UI visual effects like Shaders, translucency, animations, touch screens, and OpenGL to add a level of polish to your Activities and Views. Working with Animations Back in Chapter 3, you learned how to defi ne animations as external resources. Now, eight chapters later, you get the opportunity to put them to use. 361
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Professional Android Application su
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Professional Android Application D
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Professional Android Application D
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About the Author Originally from Pe
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Acknowledgments A big thank you goe
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Contents Chapter 2: Getting Started
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Contents xii Saving and Loading Fil
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Contents Chapter 10: Accessing Andr
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Introduction Now is an exciting tim
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Introduction covered, you can move
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Introduction At http://p2p.wrox.com
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Chapter 1: Hello, Android 2 Using t
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Chapter 1: Hello, Android An Open P
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Chapter 1: Hello, Android 6 ❑ ❑
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Chapter 1: Hello, Android 8 When ma
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Chapter 1: Hello, Android 10 In mar
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Chapter 1: Hello, Android 12 Each A
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Chapter 1: Hello, Android 14 ❑ Da
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Chapter 1: Hello, Android 16 ❑ an
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Getting Started All you need to sta
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Chapter 2: Getting Started Unless o
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Installing the ADT Plug-in Install
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Chapter 2: Getting Started 3. In th
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Chapter 2: Getting Started If every
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} lp = new LinearLayout.LayoutParam
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❑ ❑ ❑ ❑ ❑ Small screens w
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Chapter 2: Getting Started on how t
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Chapter 2: Getting Started To start
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Ensuring a Seamless User Experience
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Figure 2-11 Chapter 2: Getting Star
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} myListView.setAdapter(aa); Chapte
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Chapter 2: Getting Started A number
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Creating Applications and Activitie
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Chapter 3: Creating Applications an
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Creating Resources Chapter 3: Creat
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❑ ❑ #ARGB #ARRGGBB Chapter 3: C
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android:startOffset=”500” andro
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Referencing Resources in Resources
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} } Chapter 3: Creating Application
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Chapter 4: Creating User Interfaces
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Data Storage, Retrieval, and Sharin
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Chapter 6: Data Storage, Retrieval,
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} } } Chapter 6: Data Storage, Retr
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Querying Your Database Chapter 6: D
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} // Open or create the database to
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Adding, Updating, and Deleting Cont
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} } break; Chapter 6: Data Storage,
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Maps, Geocoding, and Location-Based
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Chapter 7: Maps, Geocoding, and Loc
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} Chapter 7: Maps, Geocoding, and L
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Summary Chapter 7: Maps, Geocoding,
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Chapter 8: Working in the Backgroun
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Peer-to-Peer Communication In this
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Chapter 9: Peer-to-Peer Communicati
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Handling Subscription Requests Chap
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Figure 9-4 Chapter 9: Peer-to-Peer
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