Download Android Essentials by Chris Haseman PDF

By Chris Haseman

Android necessities is a no-frills, no-nonsense, code-centric run in the course of the guts of software improvement on Google's cellular OS. This booklet makes use of the improvement of a pattern software to paintings via themes, concentrating on giving builders the basic instruments and examples required to make manageable advertisement purposes paintings. masking the whole lot of the Android catalog in lower than a hundred and fifty pages is just very unlikely. in its place, this booklet makes a speciality of simply 4 major issues: the appliance existence cycle and OS integration, person interface, location-based providers, and networking.

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It’s perfect for cases when a developer wants functionality (be it network or multimedia related) to be able to run independently. Examples include audio playback, background web transactions, and evil prank applications. Although services allow multiple applications to bind (to open a communications channel), with them you’ll be using it as a simple background process. Again, services have a wealth of uses beyond the simple one you’re putting them to here. info 29 Creating a Service Add a new class to your source package.

Well done! Take a second to pat yourself, or anyone who might happen to be within arms reach, on the back. So far, you’ve explored how to do screen layout in XML alone with the “socially awkward” splash screen. You’ve learned how to use a hybrid of the two just now with your login screen. The last stop on the Android widget express will require building onscreen layouts using code alone. info Widgets in Java When you see the amount of code I’ve written to produce even a small selectable menu, you’ll probably be, like I was, somewhat aghast.

If all else fails, compare your project with the sample one I’ve included with this book. If you’ve correctly followed along so far, your intent’s onReceiveIntent function will now be called each time an SMS message is sent to the handset. Next, you’ll have to figure out how to retrieve the contents of an SMS message. What’s in an SMS? Sadly, to date, Android’s documentation on receiving and filtering SMS messages is confusing at best. I suspect it’s not a feature that’s high on the list of things to tell developers about.

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