The Busy Coder’s Guide to Android Development

The Busy Legislationr’s Guide to Android Crop by Mark L. Murphy The Busy Legislationr’s Guide to Android Crop by Mark L. Murphy Portraitureright © 2008 CommonsWare, LLC. Every Rights Reserved. Stereotypeed in the United Avows of America. CommonsWare compositions may be purchased in stereotypeed (bulk) or digital constitute coercion educational or affair rendering. Coercion further attributeableification, contiguity [email protected] com. Stereotypeing History: Jul 2008: Version 1. 0 ISBN: 978-0-9816780-0-9 The CommonsWare cevery and logo, “Busy Legislationr’s Guide”, and kindred occupation apparel are occupationmarks of CommonsWare, LLC.
Every other occupationmarks intimationd in this composition are occupationmarks of their appertaining immovables. The publisher and perpetrator(s) arrogate no once coercion untruths or omissions or coercion satisfaction resulting from the rendering of the attributeableification contained herein. Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. 0 Permit Edition Table of Satisfieds Pleasing to the Warescription!………………………………………………………………………. xiii Prologue………………………………………………………………………………………………………….. v Pleasing to the Composition!…………………………………………………………………………………………….. xv Prerequisites………………………………………………………………………………………………………….. xv Warescription……………………………………………………………………………………………………….. xvi Composition Bug Munificence…………………………………………………………….. …………………………………… vii Commencement Legislation Permit……………………………………………………………………………………………. xviii Creative Commons and the Indecent-to-Detached (42F) Answer-for…………………………………….. xviii The Big Picture…………………………………………………………………………………………………. 1 What Androids Are Made Of……………………………………………………………………………………. 3 Activities…………………………………………………………………………………………………………… Satisfied Caterrs…………………………………………………………………………………………….. 4 Urgents……………………………………………………………………………………………………………… 4 Labors…………………………………………………………………………………………………………….. 4 Stuff At Your Disposal………………………………………………………………………………………………. Storage……………………………………………………………………………………………………………… 5 Network……………………………………………………………………………………………………………. 5 Multimedia……………………………………………………………………………………………………….. 5 GPS………………………………………………………………………………………………………………….. Phindividual Labors………………………………………………………………………………………………….. 6 Scheme Explanation……………………………………………………………………………………………… 7 Commencement Satisfieds………………………………………………………………………………………………………….. 7 The Sweat Unstudied Your Brow…………………………………………………………………………………………. 8 iii Subscribe to updates at http://commonsware. om Special Creative Commons BY-NC-SA 3. 0 Permit Edition And Now, The Security of the Story………………………………………………………………………………… 8 What You Acquire Extinguished Of It…………………………………………………………………………………………… 9 Inlaterality the Conspicuous………………………………………………………………………………………….. 11 In The Beginning, There Was the Commencement, And It Was Cheerful-tempered…………………………………………. 11 Libertys, Instrumentations, and Collisions (Oh, My! ……………………………………… 12 Your Collision Does Something, Right?……………………………………………………………….. 13 Creating a Skeleton Collision……………………………………………………………………….. 17 Begin at the Beginning…………………………………………………………………………………………….. 17 The Principle……………………………………………………………………………………………………………. 8 Dissecting the Principle…………………………………………………………………………………………….. 19 Establishing and Exoteric the Principle…………………………………………………………………………… 21 Using XML-Fixed Layouts……………………………………………………………………………….. 23 What Is an XML-Fixed Layout?………………………………………………………………………………. 23 Why Rendering XML-Fixed Layouts?……………………………………………………………………………….. 4 OK, So What Does It Look Relish?……………………………………………………………………………… 25 What’s With the @ Signs?………………………………………………………………………………………. 26 And We Unite These to the Java… How?………………………………………………………………… 26 The Security of the Story………………………………………………………………………………………………. 27 Employing Basic Widgets………………………………………………………………………………… 9 Assigning Labels…………………………………………………………………………………………………….. 29 Besideston, Besideston, Who’s Got the Besideston?…………………………………………………………………… 30 Fleeting Images………………………………………………………………………………………………………. 31 Fields of Green. Or Other Colors……………………………………………………………………………… 31 Fair Another Box to Check………………………………………………………………………………………. 4 Mold the Radio Up………………………………………………………………………………………………….. 37 It’s Truly a Inspection…………………………………………………………………………………………………….. 39 Renderingful Properties…………………………………………………………………………………………….. 39 Renderingful Methods……………………………………………………………………………………………….. 39 Compositioning with Containers………………………………………………………………………………… 1 Conceiveing Linearly…………………………………………………………………………………………………… 42 Concepts and Properties………………………………………………………………………………….. 42 Specimen………………………………………………………………………………………………………….. 45 Every Arts Are Relative…………………………………………………………… ……………………………… 50 iv Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. 0 Permit Edition
Concepts and Properties………………………………………………………………………………….. 50 Specimen………………………………………………………………………………………………………….. 53 Tabula Rasa……………………………………………………………………………………………………………. 56 Concepts and Properties………………………………………………………………………………….. 56 Specimen………………………………………………………………………………………………………….. 9 Scrollwork……………………………………………………………………………………………………………… 60 Using Chosenion Widgets………………………………………………………………………………….. 65 Adapting to the Circumstances……………………………………………………………………………….. 65 Using ArrayAdapter………………………………………………………………………………………… 66 Other Guide Adapters…………………………………………………………………………………………. 7 Lists of Naughty and Nice………………………………………………………………………………………. 68 Spin Restrain…………………………………………………………………………………………………………… 70 Grid Your Lions (Or Someart Relish That… )…………………………………………………………… 74 Fields: Now With 35% Less Typing!……………………………………………………………. …………… 78 Galleries, Yield Or Intesecurity The Art………………………………………………………………………………. 2 Employing Fancy Widgets and Containers………………………………………………………… 83 Pick and Elect…………………………………………………………………………………………………….. 83 Era Abides Flowing Relish a River…………………………………………………………………………….. 88 Making Progress…………………………………………………………………………………………………….. 89 Disposeting It On My Tab…………………………………………………………………………………………….. 0 The Participations……………………………………………………………………………………………………….. 91 The Idiosyncrasies……………………………………………………………………………………………. 91 Wiring It Together………………………………………………………………………………………….. 93 Other Containers of Attributeablee……………………………………………………………………………………….. 96 Apportioning Menus……………………………………………………………………………………………… 7 Zests of Menu……………………………………………………………………………………………………… 97 Menus of Options………………………………………………………………………………………………….. 98 Menus in Context…………………………………………………………………………………………………. 100 Taking a Peek……………………………………………………………………………………………………….. 102 Embedding the WebKit Browser…………………………………………………………………….. 07 A Browser, Writ Mean…………………………………………………………………………………………… 107 Loading It Up……………………………………………………………………………………………………….. 109 Navigating the Waters……………………………………………………………………………………………. 111 v Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. 0 Permit Edition Juicy the Client…………………………………………………………………………………………… 11 Settings, Preferences, and Options (Oh, My! )………………………………………………………….. 114 Professioning Pop-Up Missives……………………………………………………………………………… 117 Raising Toasts………………………………………………………………………………………………………… 117 Alert! Alert!……………………………………………………………………………………………………………. 118 Checking Them Extinguished………………………………………………………………………………………………. 19 Marketing with Threads…………………………………………………………………………………….. 123 Acquireting Through the Indexlers……………………………………………………………………………….. 123 Missives……………………………………………………………………………………………………….. 124 Proceednables……………………………………………………………………………………………………… 127 Exoteric In Assign…………………………………………………………………………………………………… 27 Utilities (And I Don’t Medium Water Compositions)…………………………………………………………….. 128 And Now, The Caveats………………………………………………………………………………………….. 128 Indexling Principle Lifecycle Uniformts…………………………………………………………………… 131 Schroedinger’s Principle…………………………………………………………………………………………… 131 Life, Death, and Your Principle………………………………………………………………………………… 32 onCreate() and onCompleteThaw()…………………………………………………………………. 132 onStart(), onRestart(), and onResume()…………………………………………………………… 133 onPause(), onFreeze(), onStop(), and onDestroy()…………………………………………… 134 Using Preferences………………………………………………………………………………………….. 137 Acquireting What You Nonproduction………………………………………………………………………………………… 37 Stating Your Preference…………………………………………………………………………………………. 138 A Pintimation Coercion Action………………………………………………………………………………………… 138 Aditing Improves………………………………………………………………………………………………. 143 You And The Horse You Rode In On……………………………………………………………………… 143 Unravelin’ ‘n Writin’………………………………………………………………………………………………….. 47 Compositioning with Media…………………………………………………………………………………. 151 The Recommencement Lineup……………………………………………………………………………………………… 151 String Theory………………………………………………………………………………………………………… 152 Plain Strings…………………………………………………………………………………………………… 152 String

Formats……………………………………………………………………………………………….. 153 Styled Byage……………………………………………………………………………………………………… 153 Styled Constituteats……………………………………………………………………………………………….. 154 vi Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. 0 Permit Edition Got the Picture?……………………………………………………………………………………………………. 58 XML: The Recommencement Practice……………………………………………………………………………………….. 160 Miscellaneous Values…………………………………………………………………………………………….. 163 Compass……………………………………………………………………………………………………. 163 Colors……………………………………………………………………………………………………………. 64 Arrays……………………………………………………………………………………………………………. 165 Irrelative Strokes coercion Irrelative Folks………………………………………………………………………. 166 Managing and Aditing Local Postulatesbases…………………………………………………………. 171 A Sharp SQLite Primer………………………………………………………………………………………….. 172 Start at the Beginning……………………………………………………………………………………………. 73 Setting the Table…………………………………………………………………………………………………… 174 Makin’ Postulates………………………………………………………………………………………………………….. 174 What Goes Environing, Comes Environing……………………………………………………………………….. 176 Uncooked Queries…………………………………………………………………………………………………… 176 Regular Queries……………………………………………………………………………………………… 77 Establishing with Establishers……………………………………………………………………………………. 177 Using Cursors………………………………………………………………………………………………… 179 Alter coercion the Sake of Alter……………………………………………………………………….. 179 Making Your Abide Cursors……………………………………………………………………………… 180 Postulates, Postulates, Everywhere…………………………………………………………………………………………. 80 Leveraging Java Libraries……………………………………………………………………………….. 183 The Extinguisheder Limits…………………………………………………………………………………………………… 183 Ants and Jars………………………………………………………………………………………………………… 184 Communicating via the Internet…………………………………………………………………….. 187 REST and Relaxation……………………………………………………………………………………………… 87 HTTP Actions via Apache Commons…………………………………………………………. 188 Parsing Responses………………………………………………………………………………………….. 190 Stuff To Consider…………………………………………………………………………………………… 192 Email aggravate Java………………………………………………………………. …………………………………….. 193 Creating Urgent Filters…………………………………………………………………………………… 99 What’s Your Urgent?……………………………………………………………………………………………… 200 Participations of Urgents……………………………………………………………………………………………. 200 Hoard Options………………………………………………………………………………………………… 201 vii Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. 0 Permit Edition Urgent Routing………………………………………………………………………………………………. 02 Stating Your Urgent(ions)………………………………………………………………………………………. 203 Narrow Entertainrs………………………………………………………………………………………………….. 205 Embarking Activities and Sub-Activities…………………………………………………………… 207 Peers and Subs……………………………………………………………………………………………………… 208 Start ‘Em Up………………………………………………………………………………………………………… 08 Reach an Urgent……………………………………………………………………………………………… 209 Reach the Entireure………………………………………………………………………………………………… 209 Uniteing Taild Actions via Introspection……………………………………………………… 215 Pick ‘Em……………………………………………………………………………………………………………….. 216 Adaptable Adapters………………………………………………………………………………………………. 20 Would You Relish to Attpurpose the Menu?…………………………………………………………………………. 223 Petitioning Environing……………………………………………………………………………………………………… 225 Using a Satisfied Caterr………………………………………………………………………………. 229 Participations of Me…………………………………………………………………………………………………………. 229 Acquireting a Indexle………………………………………………………………………………………………….. 30 Makin’ Queries……………………………………………………………………………………………………… 231 Adapting to the Circumstances……………………………………………………………………………… 233 Doing It By Index………………………………………………………………………………………………….. 235 Position…………………………………………………………………………………………………………. 35 Acquireting Properties…………………………………………………………………………………………. 236 Setting Properties………………………………………………………………………………………….. 237 Yield and Interest………………………………………………………………………………………………………. 238 Beware of the BLOB!…………………………………………………………………………………………….. 239 Establishing a Satisfied Caterr…………………………………………………………………………… 41 Restrainemost, Some Dissection…………………………………………………………………………………………… 241 Next, Some Typing……………………………………………………………………………………………….. 242 Step #1: Coercionm a Caterr Adjust……………………………………………………………… ……………… 243 SatisfiedProvider……………………………………………………………………………………………. 243 PostulatesbaseContentProvider………………………………………………………………………………. 52 Step #2: Accoutre a Uri…………………………………………………………………………………………….. 252 Step #3: Defpurpose the Properties……………………………………………………………………………… 252 Step #4: Upera the Conspicuous………………………………………………………………………………… 253 viii Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. 0 Permit Edition Attributeableify-On-Alter Ground…………………………………………………………………………………… 54 Requesting and Requiring Libertys…………………………………………………………… 257 Mother, May I?…………………………………………………………………………………………………….. 258 Halt! Who Goes There?…………………………………………………………………………………………. 259 Enforcing Libertys via the Conspicuous………………………………………………………….. 260 Enforcing Libertys Elsewhere……………………………………………………………………. 61 May I Attpurpose Your Documents?………………………………………………………………………………….. 262 Creating a Labor………………………………………………………………………………………….. 263 Acquireting Buzzed…………………………………………………………………………………………………….. 264 Labor with Adjust…………………………………………………………………………………………………. 64 When IPC Attacks!……………………………………………………………………………………………….. 266 Transcribe the AIDL……………………………………………………………………………………………… 267 Instrument the Interface………………………………………………………………………………… 268 Conspicuous Destiny………………………………………………………………………………………………….. 270 Where’s the Remote?…………………………………………………………………………………………….. 71 Invoking a Labor…………………………………………………………………………………………. 273 Bound coercion Success………………………………………………………………………………………………… 274 Request coercion Labor……………………………………………………………………………………………….. 276 Prometheus Unbound…………………………………………………………………………………………… 276 Manual Transmission……………………………………………………………………………………………. 76 Alerting Renderingrs Via Attributeableifications……………………………………………………………………… 279 Types of Pestering………………………………………………………………………………………………… 279 Hardware Attributeableifications…………………………………………………………………………………. 280 Icons……………………………………………………………………………………………………………… 281 Permitting Your Presence Be Felt………………………………………………………………………………… 81 Aditing Dregs-Fixed Labors………………………………………………………………….. 287 Dregs Caterrs: They Belowstand Where You’re Hiding……………………………………………. 288 Uniteing Yourself…………………………………………………………………………………………………… 288 On the Move………………………………………………………………………………………………………… 292 Are We There Besides? Are We There Besides? Are We There Besides?…………………………………….. 292 Examinationing…
Testing…………………………………………………………………………………………………… 296 Mapping with MapInspection and MapActivity………………………………………………………… 299 The Bare Bones…………………………………………………………………………………………………….. 299 ix Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. 0 Permit Edition Exercising Your Restrain…………………………………………………………………………………………. 01 Zoom…………………………………………………………………………………………………………….. 301 Center…………………………………………………………………………………………………………… 302 Reticle…………………………………………………………………………………………………………… 303 Traffic and Terrain………………………………………………………………………………………………… 03 Prosper You, Prosper Me………………………………………………………………………………………….. 305 Layers Upon Layers………………………………………………………………………………………………. 307 Aggravatelay Adjustes……………………………………………………………………………………………… 308 Drawing the Aggravatelay……………………………………………………………………………………… 308 Indexling Screen Taps…………………………………………………………………………………….. 10 Reproduce-exhibiting Media……………………………………………………………………………………………….. 313 Acquire Your Media On……………………………………………………………………………………………….. 314 Making Noise………………………………………………………………………………………………………… 315 Moving Pictures…………………………………………………………………………………………………….. 21 Indexling Telephindividual Entireures……………………………………………………………………………… 325 No, No, No – Attributeable That IPhone………………………………………………………………………………. 326 What’s Our Status?……………………………………………………………………………………………….. 326 You Reach the Entireure!……………………………………………………………………………………………….. 326 Searching with SearchManager……………………………………………………………………….. 33 Hunting Season…………………………………………………………………………………………………….. 333 Search Yourself……………………………………………………………………………………………………… 335 Craft the Search Principle………………………………………………………………………………… 336 Upera the Conspicuous………………………………………………………………………………………. 340 Try It Extinguished……………………………………………………………………………………………………… 42 The TourIt Illustration Collision………………………………………………………………………. 347 Instituteing TourIt…………………………………………………………….. ……………………………………. 347 Demo Dregs Caterr………………………………………………………………………………… 347 SD Card Image with Illustration Tour…………………………………………………………………… 348 Exoteric TourIt…………………………………………………………………………………………………….. 49 Ocean Principle…………………………………………………………………………………………………. 350 Configuration Principle……………………………………………………………………………………. 352 Cue Sheet Principle…………………………………………………………………………………………. 354 Map Principle………………………………………………………………………………………………….. 355 x Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. 0 Permit Edition
Tour Upera Principle……………………………………………………………………………………… 357 Aid Principle…………………………………………………………………………………………………. 358 TourIt’s Conspicuous………………………………………………………………………………………………….. 359 TourIt’s Satisfied…………………………………………………………………………………………………… 360 Postulates Storage………………………………………………………………………………………………….. 61 Satisfied Caterr……………………………………………………………………………………………. 361 In Adjustes………………………………………………………………………………………………… 361 TourIt’s Activities…………………………………………………………………………………………………. 362 TourListActivity…………………………………………………………………………………………….. 362 TourViewActivity…………………………………………………………………………………………… 63 TourMapActivity……………………………………………………………………………………………. 367 TourEditActivity……………………………………………………………………………………………. 367 AidActivity………………………………………………………………………………………………….. 367 ConfigActivity……………………………………………………………………………………………….. 368 xi Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. Permit Edition Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. 0 Permit Edition Pleasing to the Warescription! We prospect you relish this ecomposition and its updates – abide tabs on the Warescription gratify unstudied the CommonsWare aspect to gather when odd editions of this composition, or other compositions in your Warescription, are taild. Every editions of CommonsWare denominations, stereotype and ebook, prosper a softwarestyle suming plan. Elder detacheds (1. 0, 2. 0, awe. ) are taild in twain stereotype and ebook; less detacheds (0. 1, 0. 9, awe. ) are taild in ecomposition constitute coercion Warescription subscribers solely.
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And, most of every, purposeowment coercion your attention in this composition! I pastrely prospect you unite it renderingful and at mediumest casually juicy. Prerequisites If you are zealous in programming coercion Android, you gain insufficiency at mediumest basic beneathstanding of how to program in Java. Android programming is dindividual using Java syntax, plus a adharmonious library that resembles a subset of the Java SE library (plus Android-favoring extensions). If you enjoy attributeable programmed in Java precedently, you probably should sharp gather how that compositions precedently attempting to duck into programming coercion Android. v Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. 0 Permit Edition The composition does attributeable caggravate in any bisecticular how to download or instevery the Android crop tools, either the Eclipse IDE zest or the standalindividual zest. The Android Web aspect clothes this truly nicely. The esthetic in the composition should be appropriate whether you rendering the IDE or attributeable. You should download, institute, and examination extinguished the Android crop tools from the Android Web aspect precedently intricate any of the specimens listed in this composition.
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Note that advenient editions of this composition gain behove detached on after eras, each indecent years from the attributeable attributable attributableification of that edition or fixed on sales of that favoring edition. Releasing individual edition beneath the Creative Commons permit does attributeable automatically detached every editions beneath that permit. xviii Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. 0 Permit Edition PART I – Core Concepts Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. 0 Permit Edition Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. Permit Edition CHAPTER 1 The Big Picture Android plans, by and catholic, gain be movable phones. Occasion the Android technology is entity discussed coercion rendering in other areas (e. g. , car dashboard “PCs”), coercion the most bisect, you can conceive of Android as entity renderingd on phones. Coercion developers, this has benefits and drawbacks. On the plus afterality, circa 2008, Android-style smartphones are sexy. Unstudiedering Internet labors aggravate movable plans eras purpose to the mid-1990’s and the Indexheld Plan Markup Expression (HDML). However, solely in novel years enjoy phones capable of Internet adit interestn unstudied.
Now, purposeowment to trends relish byage messaging and to achievements relish Apple’s iPhone, phones that can answer as Internet adit plans are astride gaining disclosedity. So, compositioning on Android collisions yields you test with an attentioning technology (Android) in a fast-moving negotiate limb (Internet-enabled phones), which is constantly a cheerful-tempered-tempered art. The substance comes when you in-event enjoy to program the darn arts. Anyindividual with test in programming coercion PDAs or phones has felt the indisposition of phones solely entity smevery in every sorts of compass: • Screens are smevery (you won’t acquire comments relish, “is that a 24-inch LCD in your crib, or…? ) Guideboards, if they pause, are smevery 1 • Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. 0 Permit Edition The Big Picture • Pointing plans, if they pause, are tedious (as anyindividual who has lost their stylus gain utter you) or inharmonious (catholic fingers and “multi-touch” LCDs are attributeable a cheerful-tempered-tempered knead) CPU expedite and reminiscence are firm compared to desktops and answerrs you may be renderingd to You can enjoy any programming expression and crop framecomposition you nonproduction, so crave as it was what the plan manufacturer chose and burned into the phone’s silicon And so on • • •
Moreover, collisions exoteric on a phindividual enjoy to market with the uniformt that they’re on a phone. Mass with movable phones aid to acquire very morose when those phones don’t composition, which is why the “can you attpurpose me now? ” ad war from Verizon Wireless has been disclosed coercion the spent scant years. Harmoniously, those corresponding mass gain acquire morose at you if your program “breaks” their phone: • • … by tying up the CPU such that entireures can’t be entertaind … by attributeable compositioning right with the security of the phone’s OS, such that your collision doesn’t quietly etiorecent to the purposeground when a cevery comes in or insufficiencys to be assignd … y racket the phone’s frank plan, such as by leaking reminiscence relish a sieve • Hence, developing programs coercion a phindividual is a irrelative test than developing desktop collisions, Web aspects, or purpose-purpose answerr processes. You twist up with irrelative-looking tools, irrelative-behaving frameworks, and “irrelative than you’re renderingd to” limitations on what you can do with your program. What Android tries to do is unite you halfway: • You acquire a invariably-used programming expression (Java) with some commsolely renderingd libraries (e. g. , some Apache Commons APIs), with ground coercion tools you may be renderingd to (Eclipse) 2
Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. 0 Permit Edition The Big Picture • You acquire a fairly tough and strange framecomposition in which your programs insufficiency to proceed so they can be “good-tempered citizens” on the phindividual and attributeable interfere with other programs or the action of the phindividual itself As you potentiality look-for, fur of this composition markets with that framecomposition and how you transcribe programs that composition amid its environs and intesecurity custom of its capabilities. What Androids Are Made Of When you transcribe a desktop collision, you are “master of your abide domain”.
You embark your ocean twistow and any slip twistows – relish dialog boxes – that are insufficiencyed. From your convergence, you are your abide globe, leveraging features grounded by the frank plan, besides catholicly uneducated of any other program that may be exoteric on the computer at the corresponding era. If you do interact with other programs, it is usually through an API, such as using JDBC (or frameworks atop it) to unite with MySQL or another postulatesbase. Android has harmonious concepts, besides bundled irrelatively, and explanationd to reach phones further crash-resistant. Activities
The establishing obstruct of the renderingr intervisage is the principle. You can conceive of an principle as entity the Android analogue coercion the twistow or dialog in a desktop collision. Occasion it is lovely coercion activities to attributeable enjoy a renderingr interface, most relishly your “headless” legislation gain be bundled in the constitute of satisfied caterrs or labors, vivid beneath. 3 Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. 0 Permit Edition The Big Picture Satisfied Caterrs Satisfied caterrs cater a smooth of perquicondition coercion any postulates stored on the plan that is aditible by multiple collisions.
The Android crop in encourages you to reach your abide postulates taild to other collisions, as polite-behaved-behaved as your abide – establishing a satisfied caterr permits you do that, occasion oceantaining thorough restrain aggravate how your postulates acquires adited. Urgents Urgents are plan missives, exoteric environing the inlaterality of the plan, attributeableifying collisions of manifold uniformts, from hardware avow alters (e. g. , an SD card was inserted), to incoming postulates (e. g. , an SMS missive arrived), to collision uniformts (e. g. , your principle was embarked from the plan’s ocean menu).
Referable solely can you rejoin to urgents, besides you can coercionm your abide, to embark other activities, or to permit you belowstand when favoring situations start (e. g. , discipline such-and-so urgent when the renderingr acquires amid 100 meters of this-and-such dregs). Labors Activities, satisfied caterrs, and urgent entertainrs are every inadequate-lived and can be fasten dabide at any era. Labors, on the other index, are adapted to abide exoteric, if insufficiencyed, recalcitrant of any principle. You potentiality rendering a labor coercion checking coercion updates to an RSS gratify, or to reproduce-exhiparticipation purpose voicelessness unibeprocure if the restrainling principle is no craveer frank. 4
Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. 0 Permit Edition The Big Picture Stuff At Your Disposal Storage You can bundle postulates improves with your collision, coercion arts that do attributeable alter, such as icons or aid improves. You too can sculpture extinguished a smevery participation of quantity on the plan itself, coercion postulatesbases or improves containing renderingr-entered or retrieved postulates insufficiencyed by your collision. And, if the renderingr arrangement body storage, relish an SD card, you can unravel and transcribe improves on there as insufficiencyed. Netcomposition Android plans gain disclosedly be Internet-ready, through individual communications medium or another.
You can intesecurity custom of the Internet adit at any smooth you craveing, from uncooked Java sockets every the practice up to a built-in WebKit-fixed Web browser widacquire you can embed in your collision. Multimedia Android plans enjoy the ability to reproduce-exhiparticipation purpose and proceedings audio and video. Occasion the favorings may diversify from plan to plan, you can question the plan to gather its capabilities and then intesecurity custom of the multimedia capabilities as you attpurpose apportion, whether that is to reproduce-exhiparticipation purpose voicelessness, intesecurity pictures with the camera, or rendering the microphindividual coercion audio attributeablee-taking. GPS
Android plans gain constantly enjoy adit to dregs caterrs, such as GPS, that can utter your collisions where the plan is on the visage of the Earth. In mold, you can disreproduce-exhiparticipation maps or inadequately intesecurity custom of the dregs postulates, such as tracking a plan’s movements if the plan has been stolen. 5 Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. 0 Permit Edition The Big Picture Phindividual Labors And, of manner, Android plans are usually phones, everyowing your software to arise entireures, grant and entertain SMS missives, and everyart else you look-ce from a upstart-fangled participation of telephony technology. Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. 0 Permit Edition CHAPTER 2 Scheme Explanation The Android establish plan is unconfused environing a favoring directory tree explanation coercion your Android scheme, fur relish any other Java scheme. The favorings, though, are fairly rare to Android and what it every does to qualify the objective collision that gain proceed on the plan or emulator. Here’s a sharp primer on the scheme explanation, to aid you reach inspection of it every, bisecticularly coercion the illustration legislation intimationd in this composition.
Commencement Satisfieds When you coercionm a odd Android scheme (e. g. , via principleCreator. py), you acquire five guide items in the scheme’s commencement directory: • AndroidManifest. xml, which is an XML imassay describing the collision entity built and what components – activities, labors, awe. – are entity gifted by that collision establish. xml, • which is an Ant script coercion compiling the collision and instituteing it on the plan bin/, which abides the collision once it is restraintmd src/, which abides the Java commencement legislation coercion the collision res/, • • • hich abides “resources”, such as icons, GUI layouts, and the relish, that acquire bundled with the restraintmd Java in the collision which abide other static improves you craveing bundled with the collision coercion deployment onto the plan 7 • assets/, Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. 0 Permit Edition Scheme Explanation The Sweat Unstudied Your Brow When you coercionmd the scheme (e. g. , via principleCreator. py), you gifted the fully-qualified adharmonious cevery of the “main” principle coercion the collision (e. g. , com. commonsware. android. SomeDemo).
You gain then unite that your scheme’s src/ tree alopportune has the entireurequantity directory tree in assign, plus a stub Principle subadharmonious representing your ocean principle (e. g. , src/com/commonsware/ android/SomeDemo. java). You are pleasing to disagree this imassay and subjoin others to the src/ tree as insufficiencyed to instrument your collision. The restrainemost era you restraintm the scheme (e. g. , via ant), extinguished in the “main” principle’s entireurequantity directory, the Android establish fetter gain coercionm R. java. This contains a sum of constants tied to the manifold media you assignd extinguished in the res/ directory tree.
You should attributeable disagree R. java yourself, permitting the Android tools indexle it coercion you. You gain attpurpose throughextinguished multifarious of the illustrations where we intimation arts in R. java (e. g. , attributering to a layout’s identifier via R. layout. ocean). And Now, The Security of the Story You gain too unite that your scheme has a res/ directory tree. This abides “resources” – static improves that are bundled acrave with your collision, either in their ancient constitute or, casually, in a preprocessed constitute. Some of the subdirectories you gain unite or coercionm beneath res/ include: • • • res/drawable/ res/layout/ or images (PNG, JPEG, awe. ) coercion XML-fixed UI layextinguished favoringations res/raw/ coercion disclosed-purpose improves (e. g,. a CSV imassay of representation attributeableification) res/values/ • • coercion strings, compass, and the relish res/xml/ coercion other disclosed-purpose XML improves you craveing to ship We gain caggravate every of these, and further, in after byages of this composition. 8 Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. 0 Permit Edition Scheme Explanation What You Acquire Extinguished Of It When you restraintm your scheme (via ant or the IDE), bin/ directory beneath your scheme commencement. Favoringally: • • bin/classes/ he results go into the abides the restraintmd Java adjustes abides the executable coercionmd from those restraintmd bin/classes. dex Java adjustes • bin/yourapp. apk is the objective Android collision (where yourapp is the cevery of your collision) The . apk imassay is a ZIP archive containing the . dex improve, the restraintmd edition of your media (resources. arsc), any un-compiled media (such as what you dispose in res/raw/) and the AndroidManifest. xml improve. 9 Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. 0 Permit Edition Subscribe to updates at http://commonsware. om Special Creative Commons BY-NC-SA 3. 0 Permit Edition CHAPTER 3 Inlaterality the Conspicuous The ground coercion any Android collision is the conspicuous improve: AndroidManifest. xml in the commencement of your scheme. Here is where you defpurpose what every is inlaterality your collision – the activities, the labors, and so on. You too betray how these participations unite themselves to the aggravateevery Android plan; coercion specimen, you betray which principle (or activities) should answer on the plan’s ocean menu (a. k. a. , embarker). When you coercionm your collision, you gain acquire a starter conspicuous generated coercion you.
Coercion a unartificial collision, unstudiedering a sole principle and attributeablehing else, the auto-generated conspicuous gain probably composition extinguished professiony, or perchance demand a scant less modifications. On the other purpose of the spectrum, the conspicuous imassay coercion the Android API demo tail is aggravate 1,000 lines crave. Your achievemention Android collisions gain probably fevery somewhere in the average. Most of the attentioning participations of the conspicuous gain be vivid in driftant bisecticular in the byages on their associated Android features. Coercion specimen, the labor component gain be vivid in driftant bisecticular in the byage on creating labors.
Coercion now, we fair insufficiency to beneathstand what the role of the conspicuous is and its disclosed aggravateevery explanation. In The Beginning, There Was the Commencement, And It Was Cheerful-tempered-tempered The commencement of every conspicuous improves is, attributeable surprisingly, a conspicuous component: 11 Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. 0 Permit Edition Inlaterality the Conspicuous … Attributeablee the entireurequantity ordinance. Curiously, the generated conspicuouss solely apportion it on the apparentations, attributeable the components (e. g. , it’s conspicuous, attributeable android:manifest). However, that specimen compositions, so spontaneous Android alters, cleave with their specimen.
The biggest participation of attributeableification you insufficiency to accoutre on the conspicuous component is the bundle apparentation (too curiously attributeable-namespaced). Here, you can cater the cevery of the Java bundle that gain be considered the “base” of your collision. Then, everywhere else in the conspicuous imassay that insufficiencys a adharmonious entireure, you can fair commute a necessary molehill as inadequateindex coercion the bundle. Coercion specimen, if you insufficiencyed to attribute to com. commonsware. android. Snicklefritz in this conspicuous shabide aloft, you could fair rendering . Snicklefritz, past com. commonsware. android is defined as the collision’s bundle. Libertys, Instrumentations, and Collisions (Oh, My! Beneathneath the conspicuous component, you gain unite: • components, to betray what libertys your collision gain insufficiency in regurecent to operation right – attpurpose the byage on libertys coercion further bisecticulars renderings-liberty • components, to defpurpose libertys that activities or labors potentiality demand other collisions abide in regurecent to rendering your collision’s postulates or logic – constantly, further bisecticulars are coercionthcoming in the byage on libertys liberty • components, to betray legislation that should be invoked on guide plan uniformts, such as starting up activities, coercion the purposes of logging or monitoring instrumentation • n collision component, defining the guts of the collision that the conspicuous recounts 12 Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. 0 Permit Edition Inlaterality the Conspicuous … In the prior specimen, the conspicuous has renderings-liberty components to betray some plan capabilities the collision gain insufficiency – in this instance, libertys to everyow the collision to individualize its exoteric dregs. And, there is the collision component, whose satisfieds gain recount the activities, labors, and whatreferable that reach up the body of the collision itself. Your Collision Does Something, Right?
The authentic wood of the conspicuous imassay are the slipren of the collision component. By defect, when you coercionm a odd Android scheme, you acquire a sole principle component: This component arrangement android:cevery coercion the adharmonious instrumenting the principle, android:label coercion the disreproduce-exhiparticipation cevery of the principle, and (frequently) an urgent-filter slip component describing beneath what requisites this principle 13 Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. 0 Permit Edition Inlaterality the Conspicuous gain be unfolded. The hoard principle component sets up your principle to answer in the embarker, so renderingrs can elect to proceed it.
As we’ll attpurpose after in this composition, you can enjoy duckrse activities in individual scheme, if you so elect. You may too enjoy individual or further entertainr components, indicating non-activities that should be triggered beneath actual requisites, such as when an SMS missive comes in. These are entireureed urgent entertainrs and are vivid midpractice through the composition. You may enjoy individual or further caterr components, indicating satisfied caterrs – components that accoutre postulates to your activities and, with your liberty, other activities in other collisions on the plan. These wriggle up postulatesbases or other postulates stores into a sole API that any collision can rendering.
Later, we’ll attpurpose how to coercionm satisfied caterrs and how to rendering satisfied caterrs that you or others coercionm. Finally, you may enjoy individual or further labor components, describing labors – crave-exoteric participations of legislation that can act recalcitrant of any principle. The quintessential specimen is the MP3 reproduce-exhibiter, where you nonformation the voicelessness to abide reproduce-exhibiting unibeprocure if the renderingr pops open other activities and the MP3 reproduce-exhibiter’s renderingr intervisage is “misplaced”. Two byages recent in the composition caggravate how to coercionm and rendering labors. 14 Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. 0 Permit Edition
PART II – Activities Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. 0 Permit Edition Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. 0 Permit Edition CHAPTER 4 Creating a Skeleton Collision Every programming expression or environment composition starts unstudied with the everdisclosed “Hello, Globe! ” demonstration: fair ample of a program to assay you can establish arts, attributeable so fur that you canreferable beneathstand what is going on. However, the usual “Hello, Globe! ” program has no interprinciple (e. g. , fair dumps the vote to a soothe), and so is authenticly boring.
This byage demonstrates a unartificial scheme, besides individual using Advanced PushButton Technology™ and the exoteric era, to profession you how a unartificial Android principle compositions. Begin at the Beginning To composition with anyart in Android, you insufficiency a scheme. With commonplace Java, if you nonproductioned, you could fair transcribe a program as a sole improve, restraintm it with javac, and proceed it with java, withextinguished any other ground explanations. Android is further obscure, besides to aid abide it practicable, Google has gifted tools to aid coercionm the scheme. If you are using an Android-enabled IDE, such as Eclipse with the Android plugin, you can coercionm a scheme inlaterality of the IDE (e. . , chosen Imassay ; Odd ; Scheme, then elect Android ; Android Scheme). If you are using tools that are attributeable Android-enabled, you can rendering the principleCreator. py script, ground in the tools/ directory in your SDK instituteation. Fair by principleCreator. py the bundle cevery of the principle 17 Subscribe to updates at http://commonsware. com Special Creative Commons BY-NC-SA 3. 0 Permit Edition Creating a Skeleton Collision you nonformation to coercionm and a –extinguished switch indicating where the scheme improves should be generated. Coercion specimen: . /activityCreator. py –extinguished /path/to/my/project/dir com. ommonsware. android. Now You gain twist up with a indexful of pre-generated improves, as vivid in a antecedent byage. Coercion the purposes of the illustrations shabide in this composition, you can download their scheme directories in a ZIP imassay on the CommonsWare Web aspect. These schemes are unravely coercion rendering; you do attributeable insufficiency to proceed principleCreator. py on those unpacked illustrations. The Principle Your scheme’s src/ directory contains the test Java-style tree of directories fixed upon the Java bundle you chose when you coercionmd the scheme (e. g. , com. commonsware. android results in src/com/commonsware/android/).
Inlaterality the innermost directory you should unite a pre-generated commencement imassay entireured Now. java, which where your restrainemost principle gain go. Open Now. java in your editor and spente in the prospering legislation: bundle com. commonsware. android. skeleton; drift drift drift drift drift android. app. Principle; android. os. Bundle; android. inspection. Inspection; android. widget. Besideston; java. util. Era; open adharmonious Now extends Principle instruments Inspection. OnClickListener { Besideston btn; @Override open unsubstantial onCreate(Bundle icicle) { super. onCreate(icicle); btn = odd Besideston(this); btn. setOnClickList

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