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 e-book makes use of the advance 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 everything of the Android catalog in below a hundred and fifty pages is just very unlikely. as a substitute, this booklet specializes in simply 4 major issues: the appliance existence cycle and OS integration, consumer interface, location–based providers, and networking. Thorough, entire, and priceless 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 functions What you’ll research know the way an Android software features and communicates with the handset that hosts it. understand the complexities of timers, providers, and multimedia playback. Create and exhibit a wealthy mixture of custom–rendered displays and adapted Android widgets. know the way location–based providers have gotten increasingly more vital within the cellular international. See the best way to use Google’s robust Map device. discover the intricacies of community connectivity within the cellular international. Who this publication is for This booklet 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 realizing of Java. they need to be capable of write sessions and deal with easy inheritance constructions. This publication additionally pursuits hobbyist builders trying to negotiate the advanced minefield of cellular software program. desk of Contents advent the applying consumer Interface place, position, place Taking Android Out for a stroll Tying on a Bow
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Additional resources for Android Essentials (Firstpress)
In the final production version of a login screen, you want to extract the entered text, begin a network login call, and fire up a loading dialog box. For now, you’ll just show a dialog box containing what’s been entered in the login and password fields. ", false); } First, using findViewById, you retrieve TextView and EditText pointers for the status, username, and password widgets. Next, you extract the contents of the text-entry widgets by retrieving the TextEntry object and converting it into a String class.
Html#Menu. From there, you can move on to the first UI task: making a login screen for the “socially awkward” application. This login screen will become part of the getSplashy example application. Scrolling, Text Entry, Buttons, and All the Simple Things in Life It’s now time to put one of the layout classes to use. XML layouts are perfect for user input, information relay, and nearly anything where the contents of the screen are relatively static. You’ll add a simple login Android Essentials 51 screen to the aforementioned “socially awkward” application (see Code Listing 3-1).
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" >