Professional Android 4 Application Development

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220 x CHAPTER 6 USING INTERNET RESOURCES Every time you create a new connection to download additional data, you risk waking the wireless radio from standby mode to active mode. In general, it’s good practice to bundle your connections and associated downloads to perform them concurrently and infrequently. To use a converse example, creating frequent, short-lived connections that download small amounts of data can have the most dramatic impact on the battery. You can use the following techniques to minimize your application’s battery cost. ‰ Aggressively prefetch — The more data you download in a single connection, the less frequently the radio will need to be powered up to download more data. This will need to be balanced with downloading too much data that won’t be used. ‰ Bundle your connections and downloads — Rather than sending time-insensitive data such as analytics as they’re received, bundle them together and schedule them to transmit concurrently with other connections, such as when refreshing content or prefetching data. Remember, each new connection has the potential of powering up the radio. ‰ Reuse existing connections rather than creating new ones — Using existing connections rather than initiating new ones for each transfer can dramatically improve network performance, reduce latency, and allow the network to intelligently react to congestion and related issues ‰ Schedule repeated downloads as infrequently as possible — It’s good practice to set the default refresh frequency to as low as usability will allow, rather than as fast as possible. For users who require their updates to be more frequent, provide preferences that allow them to sacrifice battery life in exchange for freshness.
7Files, Saving State, and Preferences WHAT’S IN THIS CHAPTER? ‰ Persisting simple application data using Shared Preferences ‰ Saving Activity instance data between sessions ‰ Managing application preferences and building Preference Screens ‰ Saving and loading files and managing the local filesystem ‰ Including static files as external resources This chapter introduces some of the simplest and most versatile data-persistence techniques in Android: Shared Preferences, instance-state Bundles, and local files. Saving and loading data is essential for most applications. At a minimum, an Activity should save its user interface (UI) state before it becomes inactive to ensure the same UI is presented when it restarts. It’s also likely that you’ll need to save user preferences and UI selections. Android’s nondeterministic Activity and application lifetimes make persisting UI state and application data between sessions particularly important, as your application process may have been killed and restarted before it returns to the foreground. Android offers several alternatives for saving application data, each optimized to fulfill a particular need. Shared Preferences are a simple, lightweight name/value pair (NVP) mechanism for saving primitive application data, most commonly a user’s application preferences. Android also offers a mechanism for recording application state within the Activity lifecycle handlers, as well as for providing access to the local filesystem, through both specialized methods and the java.io classes. Android also offers a rich framework for user preferences, allowing you to create settings screens consistent with the system settings.
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PROFESSIONAL ANDROID 4 APPLICATION
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PROFESSIONAL Android 4 Application
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To Kris
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ABOUT THE TECHNICAL EDITOR DAN ULER
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ACKNOWLEDGMENTS FIRST, I’D LIKE T
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CONTENTS CHAPTER 2: GETTING STARTED
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CONTENTS CHAPTER 4: BUILDING USER I
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CONTENTS Monitoring Device State Ch
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CONTENTS Using Content Providers 27
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CONTENTS Updating Menu Items Dynami
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CONTENTS Hardware Acceleration 466
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CONTENTS Creating and Using Overlay
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CONTENTS Using the Camera Preview 6
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CONTENTS Emergency Responder SMS Ex
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INTRODUCTION THIS IS AN EXCITING TI
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INTRODUCTION resolutions), how to m
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INTRODUCTION SOURCE CODE As you wor
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PROFESSIONAL Android 4 Application
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2 x CHAPTER 1 HELLO, ANDROID servic
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4 x CHAPTER 1 HELLO, ANDROID ‰ Go
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6 x CHAPTER 1 HELLO, ANDROID It’s
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8 x CHAPTER 1 HELLO, ANDROID Backgr
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12 x CHAPTER 1 HELLO, ANDROID As of
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14 x CHAPTER 1 HELLO, ANDROID INTRO
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4Building User Interfaces WHAT’S
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Android User Interface Fundamentals
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Introducing Layouts x 99 ‰ GridLa
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Introducing Layouts x 101 LISTING 4
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Introducing Layouts x 103 android:l
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Introducing Layouts x 105 Combining
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To-Do List Example x 107 TO-DO LIST
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To-Do List Example x 109 FIGURE 4-5
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To-Do List Example x 111 ListView a
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To-Do List Example x 113 listening
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Introducing Fragments x 115 Fragmen
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Introducing Fragments x 117 import
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Introducing Fragments x 121 android
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Introducing Fragments x 123 MyFragm
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Introducing Fragments x 127 Activit
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Introducing Fragments x 129 import
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Introducing Fragments x 131 android
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Creating New Views x 133 ‰ ViewPa
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Creating New Views x 135 // Render
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Creating New Views x 137 4. With th
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Creating New Views x 139 Listing 4-
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Creating New Views x 141 } } }); co
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Creating New Views x 143 int specMo
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Creating New Views x 145 The onMeas
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Creating New Views x 147 Handling U
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Creating New Views x 149 LISTING 4-
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Creating New Views x 151 @Override
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Creating New Views x 153 } textPain
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Creating New Views x 155 } if (isSh
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Introducing Adapters x 157 LISTING
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Introducing Adapters x 159 } public
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Introducing Adapters x 161 public c
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Introducing Adapters x 163 LISTING
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166 x CHAPTER 5 INTENTS AND BROADCA
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Creating Content Providers x 271 //
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Creating Content Providers x 273 re
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Using Content Providers x 275 Listi
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Using Content Providers x 277 When
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Using Content Providers x 279 } Str
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Using Content Providers x 281 Delet
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Using Content Providers x 285 publi
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Using Content Providers x 289 int u
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Adding Search to Your Application x
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Creating a Searchable Earthquake Co
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Native Android Content Providers x
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332 x CHAPTER 9 WORKING IN THE BACK
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360 x CHAPTER 10 EXPANDING THE USER
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11 Advanced User Experience WHAT’
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Designing for Every Screen Size and
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Introducing Android Text-to-Speech
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Using Speech Recognition x 439 } }
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Controlling Device Vibration x 441
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Working with Animations x 443 ‰ T
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Working with Animations x 445 Creat
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Working with Animations x 447 This
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Working with Animations x 449 anim.
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Enhancing Your Views x 451 ‰ draw
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Enhancing Your Views x 453 FIGURE 1
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Enhancing Your Views x 455 // Apply
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Enhancing Your Views x 457 Anti-ali
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Enhancing Your Views x 461 } skyHor
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Enhancing Your Views x 465 // Other
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Enhancing Your Views x 467 It’s a
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Enhancing Your Views x 469 public v
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Enhancing Your Views x 471 ‰ onKe
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Enhancing Your Views x 473 else { /
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Advanced Drawable Resources x 477 a
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Copy, Paste, and the Clipboard x 47
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12 Hardware Sensors WHAT’S IN THI
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Using Sensors and the Sensor Manage
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Monitoring a Device’s Movement an
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Introducing the Environmental Senso
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514 x CHAPTER 13 MAPS, GEOCODING, A
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14 Invading the Home Screen WHAT’
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Creating App Widgets x 567 Widgets
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Creating App Widgets x 569 ‰ Imag
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Creating App Widgets x 571 To creat
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Creating App Widgets x 573 The sect
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Creating App Widgets x 575 You can
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Creating App Widgets x 577 Using a
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Creating App Widgets x 579 LISTING
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Creating App Widgets x 581 To assig
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Creating an Earthquake Widget x 583
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Creating an Earthquake Widget x 585
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Introducing Collection View Widgets
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Introducing Live Folders x 605 FIGU
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Introducing Live Folders x 607 } //
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Introducing Live Folders x 609 } //
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Introducing Live Folders x 611 priv
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Introducing Live Folders x 613 7. O
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Surfacing Application Search Result
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Creating Live Wallpaper x 617 andro
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Creating Live Wallpaper x 619 @Over
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622 x CHAPTER 15 AUDIO, VIDEO, AND
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16 Bluetooth, NFC, Networks, and Wi
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Using Bluetooth x 667 The Bluetooth
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Using Bluetooth x 669 } }; tt = “
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Using Bluetooth x 671 } } if (resul
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Using Bluetooth x 673 intent.getStr
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Using Bluetooth x 675 It’s also i
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Using Bluetooth x 677 To create a n
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Managing Network and Internet Conne
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Managing Network and Internet Conne
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Managing Wi-Fi x 683 LISTING 16-14:
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Managing Wi-Fi x 685 String connSum
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Transferring Data Using Wi-Fi Direc
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Near Field Communication x 693 Like
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Near Field Communication x 695 Usin
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Near Field Communication x 697 Intr
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Near Field Communication x 699 Ndef
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17 Telephony and SMS WHAT’S IN TH
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Using Telephony x 703 The following
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Using Telephony x 705 Accessing Tel
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Using Telephony x 707 Reading SIM D
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Using Telephony x 709 Your Phone St
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Using Telephony x 711 ‰ STATE_OUT
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Introducing SMS and MMS x 713 } } }
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Introducing SMS and MMS x 715 Sendi
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Introducing SMS and MMS x 717 } },
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Introducing SMS and MMS x 719 To li
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Introducing SMS and MMS x 721 2. Ad
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Introducing SMS and MMS x 723 FIGUR
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Introducing SMS and MMS x 725 } };
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Introducing SMS and MMS x 727 lock.
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Introducing SMS and MMS x 729 @Over
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Introducing SMS and MMS x 731 andro
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Introducing SMS and MMS x 733 } pub
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Introducing SMS and MMS x 735 // Cr
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Introducing SIP and VOIP x 737 requ
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740 x CHAPTER 18 ADVANCED ANDROID D
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772 x CHAPTER 19 MONETIZING, PROMOT
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Activity class - analytics lifecycl
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AppWidgets - background backward co
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Camera Parameters - code taking pic
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Content Resolver - DDMS Content Res
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Draw9patch - ExpandableListActivity
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frame-by-frame animation - GridLayo
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Intent Service - launch configurati
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Lint tool - map-based Activities Li
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merge tag - methods creating, 379-3
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onActivityCreated event - paid appl
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processes - remote devices processe
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SDK - Sensors supporting, 427-430 t
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SharedPreferences class - static fi
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ToDoListItemView class - uses-sdk t
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wallpaper - Widgets creating, 757-7
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