Android™ Application Development - Bahar Ali Khan

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Chapter 11: Advanced Android <strong>Development</strong> 398 } float vertical = _event.getY(); float horizontal = _event.getX(); // TODO: Process trackball movement. return false; Summary This fi nal chapter has served as a catch-all for some of the more complex Android features that were glossed over in earlier chapters. You learned more about Android’s security mechanisms, in particular, examining the permissions mechanism used to control access to Content Providers, Services, Activities, Intent Receivers, and broadcast Intents. You explored the possibilities of interprocess communication using the Android Interface Defi nition Language to create rich interfaces between application components. Much of the last part of the chapter focused on the Canvas class, as some of the more complex features available in the 2D drawing library were exposed. This included an examination of the drawing primitives available and a closer look at the possibilities of the Paint class. You learned to use transparency and create gradient Shaders before looking at Mask Filters, Color Filters, and Path Effects. You also learned how to use hardware acceleration on 2D canvas-based Views, as well as some Canvas drawing best-practice techniques. You were then introduced to the SurfaceView — a graphical control that lets you render graphics onto a surface from a background thread. This led to an introduction of rendering 3D graphics using the OpenGL ES framework and using the Surface View to provide live camera previews. Finally, you learned the details for providing interactivity within your Activities and View by listening for and interpreting touch screen, track ball, and key press events. In particular, you learned: ❑ Some of the possibilities of using the Internet as a data source, or processing middle tier, to keep your applications lightweight and information-rich. ❑ How to animate Views and ViewGroups using tweened animations. ❑ How to create frame-by-frame animations. ❑ Which drawing primitives you can use to draw on a canvas. ❑ How to get the most out of the Paint object using translucency, Shaders, Mask Filters, Color Filters, and Path Effects. ❑ Some of the best-practice techniques for drawing on the canvas. ❑ That you can apply hardware acceleration to 2D graphics drawing.
SYMBOLS AND NUMBERS @ (at), 61 | (pipe), 65 - (hyphen), 63 2D (two-dimensional) graphics of Android, 8 hardware acceleration for, 380 3D (three-dimensional) graphics of Android, 8 with SurfaceView , 392–393 9 (nine) patches, 381 A AAPT (Android Asset Packaging Tool), 42 AbsoluteLayout class, 79 acceleration, 324 accelerometers Android features, 6 animating sliding user interface example, 370 constants, 322 creating Speedometer, 326–329 defi ned, 323 using, 324–325 access. See also security Content Provider, 189 exposing data source, 195–197 fi les in Content Providers, 192 hardware. See hardware APIs Location Manager, 213 permission tags, 48 phone properties, 338 retrieving Shared Preferences, 161–162 scanning for Wi-Fi hotspots, 349 accuracy fi nding Location Providers based on, 212–213 Sensor Manager, 321–322 actions anonymous, 130–132 making phone calls, 334 monitoring Wi-Fi connectivity, 348 native Activity, 120–121 native broadcast, 135–136 passing responsibility, 124 strings, 132–133 tag, 121 transmitting data messages, 290 active connections, 346–347 active lifetime, 72–73 active processes, 52 active state, 69 Activities binding to background Services, 258–259 classes, 73 creating, 66–67 creating Compass and artifi cial horizon, 330–333 creating earthquake viewer, 148–156 creating UIs with Views, 77–78 defi ned, 46, 76 Dialog-themed, 144 Emergency Responder, 297–314 environment considerations, 34 launching with Intents, 114–121 life-cycle, 68–73 map-based, 224–226 permissions, 355 runtime confi guration changes, 64–65 saving state, 162–165 sliding user interface example, 365–370 Speedometer, 326–329 “Where Am I?” example, 214–216 Activity base class, 27 Activity Manager, 35–36 Activity Menus. See also menus adding to to-do list example, 107–112 Context Menus, 105–107 defi ned, 101–104 activity tags, 47 activityCreator, 42 ActivityGroup, 73 adapters Bluetooth, 339–345 database, 177–179 introducing, 136–141 summary, 157 ADB (Android Debug Bridge), 42–43 adding Overlays, 234 adding rows, 182–183 address geocoding, 220–223 ADT (Android Developer Tool) plug-in, 21–24 advanced Android development. See Android, advanced development AIDL (Android Interface Defi nition Language), 356–361 Alarms automating Emergency Responder, 311–312 Index background Services, 273–274 updating earthquake example with, 274–276 AlertDialog class creating earthquake viewer, 148–156 defi ned, 145–146 alerts Notifi cations, 265–273 proximity, 219–220 alpha, 57–58 Amazon Web Services, 361 Android, 1–17 applications. See applications background, 2–3 Content Providers, 192–194 database design considerations, 180 developing for, 9–11 development framework, 11–16 hardware APIs. See hardware APIs menu system, 99–101 native applications, 4–5 OHA, 8–9 open platform for mobile development, 4 overview, 1–2 running, 9 SDK features, 5–8 summary, 17 what it isn’t, 3 Android, advanced development, 353–398 animating layouts and View Groups, 370–372 animating sliding user interface example, 365–370 animations, 361–365 Canvas drawing, 373–374 Canvas drawing, best practices, 380–381 compass face example, 381–389 hardware acceleration for 2D graphics, 380 improving paint quality with antialiasing, 379–380 interactive controls, 393–398 Internet Services, 361 IPC support with AIDL, 356–361 map Overlays, 389–390 overview, 353 painting, 374–379 security, 354–355 skinning applications with themes, 372–373 summary, 398 SurfaceView, 390–393
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Professional Android Application su
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Professional Android Application D
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Professional Android Application D
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About the Author Originally from Pe
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Acknowledgments A big thank you goe
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Contents Chapter 2: Getting Started
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Contents xii Saving and Loading Fil
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Contents Chapter 10: Accessing Andr
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Introduction Now is an exciting tim
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Introduction covered, you can move
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Introduction At http://p2p.wrox.com
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Chapter 1: Hello, Android 2 Using t
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Chapter 1: Hello, Android An Open P
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Chapter 1: Hello, Android 6 ❑ ❑
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Chapter 1: Hello, Android 8 When ma
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Chapter 1: Hello, Android 10 In mar
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Chapter 1: Hello, Android 12 Each A
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Chapter 1: Hello, Android 14 ❑ Da
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Chapter 1: Hello, Android 16 ❑ an
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Getting Started All you need to sta
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Chapter 2: Getting Started Unless o
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Installing the ADT Plug-in Install
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Chapter 2: Getting Started 3. In th
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Chapter 2: Getting Started If every
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} lp = new LinearLayout.LayoutParam
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❑ ❑ ❑ ❑ ❑ Small screens w
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Chapter 2: Getting Started on how t
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Chapter 2: Getting Started To start
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Ensuring a Seamless User Experience
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Figure 2-11 Chapter 2: Getting Star
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} myListView.setAdapter(aa); Chapte
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Chapter 2: Getting Started A number
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Creating Applications and Activitie
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Chapter 3: Creating Applications an
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Creating Resources Chapter 3: Creat
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❑ ❑ #ARGB #ARRGGBB Chapter 3: C
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android:startOffset=”500” andro
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Referencing Resources in Resources
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} } Chapter 3: Creating Application
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Chapter 4: Creating User Interfaces
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Chapter 5: Intents, Broadcast Recei
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Data Storage, Retrieval, and Sharin
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Chapter 6: Data Storage, Retrieval,
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} } } Chapter 6: Data Storage, Retr
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Querying Your Database Chapter 6: D
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} // Open or create the database to
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Adding, Updating, and Deleting Cont
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} } Chapter 6: Data Storage, Retrie
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} } break; Chapter 6: Data Storage,
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Maps, Geocoding, and Location-Based
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Chapter 7: Maps, Geocoding, and Loc
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} Chapter 7: Maps, Geocoding, and L
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Summary Chapter 7: Maps, Geocoding,
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Chapter 8: Working in the Backgroun
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Peer-to-Peer Communication In this
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Chapter 9: Peer-to-Peer Communicati
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} Chapter 9: Peer-to-Peer Communica
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Handling Subscription Requests Chap
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Figure 9-4 Chapter 9: Peer-to-Peer
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Accessing Android Hardware Android
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Chapter 10: Accessing Android Hardw
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content.put(Audio.AudioColumns.DATE
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Android™ Application Development - Bahar Ali Khan

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