Android Essentials (Firstpress) by Chris Haseman

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 publication makes use of the advance of a pattern software to paintings via issues, concentrating on giving builders the basic instruments and examples required to make possible advertisement functions paintings. overlaying everything of the Android catalog in below a hundred and fifty pages is just very unlikely. in its place, this ebook makes a speciality of simply 4 major themes: the appliance existence cycle and OS integration, person interface, location–based providers, and networking. Thorough, entire, and worthy 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 study know the way an Android software services and communicates with the handset that hosts it. understand the complexities of timers, prone, and multimedia playback. Create and demonstrate a wealthy mixture of custom–rendered displays and adapted Android widgets. know the way location–based providers have gotten progressively more vital within the cellular international. See easy methods to use Google’s robust Map software. discover the intricacies of community connectivity within the cellular global. Who this e-book is for This e-book is for pro software program engineers seeking to circulate their rules and purposes into the cellular house with Android. the writer assumes the reader has a satisfactory figuring out of Java. they need to be capable to write periods and deal with easy inheritance buildings. This ebook additionally pursuits hobbyist builders trying to negotiate the complicated minefield of cellular software program. desk of Contents creation the applying person Interface place, position, position Taking Android Out for a stroll Tying on a Bow

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This graphical screen directs users to the various functionality of the mobile application.

So, build your dependency from the beginning of the XML file to the end. Note that IDs are required so that widgets can reference each other. com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" > Android Essentials 45 Figure 3-2.

When it received that precise intent action, your activity would display a “gotcha” message to the victim. At the same time, the activity would send out an intent meant to start up a service. If, at any point the victim/user pressed a key on the phone, the application would exit, and the music service would be terminated. 3. The service class, called PrankService, listening for the PrankActivity’s intent, would start and begin to play an obnoxious, predefined audio file. It would continue to play until it was told to stop by the PrankActivity’s call to the method stopService.

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