By Chris Haseman
Android necessities is a no–frills, no–nonsense, code–centric run in the course of the guts of program improvement on Google’s cellular OS. This ebook makes use of the improvement of a pattern program to paintings via issues, targeting giving builders the basic instruments and examples required to make manageable advertisement purposes paintings. overlaying everything of the Android catalog in below one hundred fifty pages is just very unlikely. as an alternative, this booklet specializes in simply 4 major subject matters: the applying existence cycle and OS integration, person interface, location–based prone, and networking. Thorough, whole, and necessary paintings at the nuts and bolts of software improvement in Android instance pushed and virtually minded a device for hobbyists and pros who are looking to create production–quality purposes What you’ll research know the way an Android program features and communicates with the handset that hosts it. understand the complexities of timers, providers, and multimedia playback. Create and reveal a wealthy mixture of custom–rendered monitors and adapted Android widgets. know how location–based prone have gotten progressively more very important within the cellular global. See how you can use Google’s strong Map software. discover the intricacies of community connectivity within the cellular global. Who this booklet is for This e-book is for pro software program engineers trying to movement their principles and purposes into the cellular area with Android. the writer assumes the reader has a satisfactory knowing of Java. they need to have the capacity to write periods and deal with simple inheritance buildings. This e-book additionally ambitions hobbyist builders seeking to negotiate the complicated minefield of cellular software program. desk of Contents creation the appliance consumer Interface situation, place, place Taking Android Out for a stroll Tying on a Bow
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Additional resources for Android Essentials (Firstpress)
Note A widget in Android refers to any self-contained subclass of the View object. For the titles and text-entry labels, you use the TextView object. For usercontrolled text entry, you use the EditText object. Most notable, and therefore the one worth going over in more detail, is the final “status” text:
DEFAULT" /> Now, if you’ve correctly added the earlier code in place, when you send a SMS message from the DDMS perspective, you should see your application come to the foreground and the “Hello World, PrankActivity” text display proudly on the screen. Rigging the Activity There is one last piece you’ll need to add before getting into the more dastardly music playback service: rigging up the activity to correctly Android Essentials 27 respond to the action sent by your SMS intent receiver.
If they’re not correct, you should see a failed permissions message go by on the bottom of the DDMS screen on the LogCat tab. Also, make sure your application is already running and has the green debugging icon next to it on the Devices tab. 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.
Android Essentials (Firstpress) by Chris Haseman