By Lauren Darcey, Shane Conder
In simply 24 classes of 1 hour or much less, the right way to construct robust functions for the world’s first whole, open, and unfastened cellular platform: Android. utilizing this book’s easy, step by step process, you’ll construct a fully-featured Android program from the floor up and grasp the talents you must layout, boost, attempt, and put up robust purposes. each one lesson builds on what you’ve already realized, supplying you with a rock-solid origin for real-world success!
Step-by-step instructions rigorously stroll you thru the most typical Android improvement tasks.
Quizzes and workouts at the tip of every bankruptcy assist you try out your wisdom.
By the Way notes current attention-grabbing details concerning the dialogue.
Did You Know? suggestions provide suggestion or exhibit you more uncomplicated how one can practice initiatives.
Watch Out! cautions provide you with a warning to attainable difficulties and provides you suggestion on the way to stay away from them.
Learn easy methods to…
- Develop Android functions quick and effectively with Java
- Master Google’s Android SDK and improvement tools
- Leverage the Eclipse programming setting to boost Android projects
- Understand the Android program lifecycle
- Build powerful, straightforward consumer interfaces
- Retrieve, shop, and paintings with program data
- Develop strong community purposes
- Add renowned social beneficial properties and location-based companies for your applications
- Take benefit of Android machine just like the camera
- Internationalize, attempt, and submit your Android applications
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Additional info for Sams Teach Yourself Android Application Development in 24 Hours
Android purposes can comprise many alternative types of assets. the next are essentially the most universal source forms: . Strings, colours, and dimensions . Drawable photos records . structure documents . uncooked documents of every kind source kinds are outlined with unique XML tags and arranged into specifically named venture directories. a few /res subdirectories, corresponding to the /drawable, /layout, and /values directories, are created via default while a brand new Android undertaking is created, whereas others has to be extra through the developer while required. From the Library of Wow! publication Using software and procedure assets determine four. 1 Android program assets video game instance: “Chippy’s Revenge” shades #00FF00 #FF00FF #0F0F0F STRINGS “Play online game” “High rankings” “About the sport” “Purchase Nuts” “Donate! ” sixty one DRAWABLES (Graphics and Icons) Android purposes can use numerous assets. DIMENSIONS 14pt 22pt 100px 160px uncooked records video game XML dossier ANDROID program online game Sound dossier “ CHIPPY’S REVENGE! ” online game support textual content dossier structure documents (Screen consumer Interfaces) Menu reveal online game monitor aid display this is often the assistance textual content for Chippy’s Revenge, a online game approximately accumulating nuts and keeping off cats. source documents saved inside /res subdirectories needs to abide via the next principles: . source filenames has to be lowercase. . source filenames may perhaps comprise letters, numbers, underscores, and classes purely. . source filenames (and XML identify attributes) has to be distinctive. From the Library of Wow! e-book 62 do you know? HOUR four: handling software assets whilst assets are compiled, their identify dictates their variable identify. for instance, a portraits dossier kept in the /drawable listing as mypic. jpg is referenced as @drawable/mypic. you will need to identify source names intelligently. seek advice the Android documentation for particular undertaking listing naming conventions. Referencing software assets All software assets are saved in the /res undertaking listing constitution and are compiled into the undertaking at construct time. software assets can be utilized programmatically. they could even be referenced in different software assets. be careful! at any time when you store a source dossier (that is, reproduction a source dossier reminiscent of a portraits dossier into the correct listing) inside of Eclipse, the R. java type dossier is recompiled to include your adjustments. in case you have no longer used the right kind directoryor file-naming conventions, you notice a compiler blunders within the Eclipse difficulties tab. program assets may be accessed programmatically utilizing the generated classification dossier known as R. java. To reference a source, you need to retrieve the application’s assets item utilizing the getResources() strategy after which make the appropri- ate strategy name, in response to the kind of source you need to retrieve. for instance, to retrieve a string named hi outlined within the strings. xml source dossier, you'll use the next procedure name: String greeting = getResources(). getString(R. string. hello); we'll speak extra approximately the way to entry sorts of assets later during this hour.