book

Native Mobile Development

by Shaun Lewis, Mike Dunn

November 2019

Intermediate to advanced

394 pages

9h 44m

English

O'Reilly Media, Inc.

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Preface
Why We Wrote This BookWho This Book Is ForHow This Book Is OrganizedConventions Used in This BookUsing Code ExamplesO’Reilly Online LearningHow to Contact UsAcknowledgments
I. Tasks and Operations
A Note About the State of Mobile Development
1. UI Controllers
TasksAndroidHow to Create Your App’s Starting UI ControllerHow to Change the Active UI ControllerUnderstanding the UI Controller Life CycleiOSHow to Create Your App’s Starting UI ControllerHow to Change the Active UI ControllerUnderstanding the Controller Life CycleWhat We’ve Learned
2. Views
TasksAndroidCreate a New ViewNesting ViewsUpdate a View’s StateiOSCreate a New ViewNesting ViewsInterface Builder to the RescueUpdate a View’s StateModifying PositionWhat We’ve Learned
3. Custom Components
TasksAndroidHow to Create a Custom ViewHow to Use a Custom ViewiOSHow to Create a Custom ViewHow to Use a Custom ViewWhat We’ve Learned
4. User Input
TasksAndroidReceive and React to a TapReceive and React to Keyboard InputHandle Compound GesturesiOSReceive and React to a TapReceive and React to Keyboard InputHandle Compound GesturesWhat We’ve Learned
5. Message Passing
TasksAndroidUse a Callback to React to an OperationDispatch a Message to Any Interested SubscribersListen for, and React to, Messages Dispatched Within a SystemiOSUse a Callback to React to an OperationDispatch a Message to Any Interested SubscribersListen for, and React to, Messages Dispatched Within a SystemClosures Instead of SelectorsStop Listening for NotificationsWhat We’ve Learned
6. Files
TasksAndroidGet Properties from the File Like Size or Last Modified DateRead and Write Data to and from a FileCopy Data from One File to AnotheriOSGet Properties from the File Like Size or Last Modified DateReading and Writing Data to and from a FileCopy Data from One File to AnotherWhat We’ve Learned
7. Persistence
TasksAndroidEstablish a Database ConnectionCreate a Database Table or Persistent ObjectWrite Data to That Table or Persistent ObjectRead Data from That Table or Persistent ObjectiOSSet Up and Connect to a Persistence LayerDefine and Create a Database Table or Persistent ObjectWrite and Persist Data to SQLiteRead Data from SQLiteWhat We’ve Learned
8. Concurrency (Multi-Threading)
TasksAndroidPerform a Task in a Background ThreadAct on the Results of Work Performed in the Background Thread on the Main ThreadTerminating a ThreadiOSPerform a Task in a Background ThreadAct on the Results of Work Performed in the Background Thread on the Main ThreadWhat We’ve Learned

9. Networking
TasksAndroidRead and Print a Text File on a Remote ServerMake an HTTP POST RequestDownload a Binary FileiOSRead and Print a Text File on a Remote ServerMake an HTTP POST RequestDownload a Binary FileWhat We’ve Learned
10. User Feedback
TasksAndroidUse Framework-Provided Tools to Show the User FeedbackSnackbarUpdate the Status BariOSUse Framework-Provided Tools to Show the User FeedbackUpdate the Status BarWhat We’ve Learned
11. User Preferences
TasksAndroidWrite User PreferencesRead User PreferencesWork with User Preferences in a Multiple User ApplicationiOSWrite User PreferencesRead User PreferencesWork with User Preferences in a Multiple User ApplicationWhat We’ve Learned
12. Serialization and Transports
TasksAndroidSerialize and Deserialize an Object InstanceiOSSerialize and Deserialize an Object InstanceiOS NotesWhat We’ve Learned
13. Extensions
TasksAndroidAdd Functionality to Existing APIsiOSAdd Functionality to Existing APIsWhat We’ve Learned
14. Testing
TasksAndroidSet Up and Run Unit TestsSet Up and Run Integration TestsiOSSet Up and Run Unit TestsWhat We’ve Learned
II. Sample App
15. Welcome and Environment Setup
Comparing Native Development to Cross-Platform ToolsWeb-BasedOtherEnvironment SetupAndroid SetupiOS SetupWhat We’ve Learned
16. Building an App
Creating a New ProjectAndroid StudioXcodeApp ArchitectureBuilding Our First ScreenAndroidiOSWhat We’ve Learned
17. Listing Data in the App
Sprucing Up ViewsAndroidiOSAdding a ButtoniOSLists, Lists, and More Lists!Add a New Catalog ViewWiring Up the ButtonBooksPopulating the List ViewAndroidiOSWhat We’ve Learned
18. Modeling Our Library
Dynamic Data in List ViewsAndroidiOSIt’s Time for Our Model Objects to Get RealJSON for One, JSON for AllSwitch the Model Layer to JSONAndroidiOSWhat We’ve Learned
19. And Yet, We Persisted
Detailing Our BooksAndroidiOSSaving Books for LaterAndroidiOSStoring Books for LaterAndroidiOSSaving BooksAndroidWhat We’ve Learned
20. Networking and Our App
Searching the WorldAndroidiOSBuilding a Search EndpointInstalling Node and ExpressLocations JSON FileCalling Our ServiceAndroidiOSWhat We’ve Learned
Index

Content preview from Native Mobile Development

Chapter 11. User Preferences

Allowing personalization of an app is a great way to help the user experience and provide a way for users to tailor an application to suit their needs. Android and iOS provide a set of frameworks, along with a set of patterns, in order to achieve this goal. There are, of course, heavy-handed and cumbersome technologies one could use—and often must—for more complex scenarios. However, most developers can get by with reading and writing user preferences in a simple and out-of-the-box method.

Tasks

In this chapter, you’ll learn to:

Write user preferences.
Read user preferences.
Work with user preferences in a multiple user application.

Android

In Android, it’s possible to use the filesystem, or a database, to store user preferences if you prefer to roll your own, but Android does provide the SharedPreferences API out of the box. While this API is generally encouraged for constancy, it’s not rigorously required or even referenced, and if you find that your requirements make other approaches easier for you, feel free.

From the Android developer docs:

If you don’t need to store a lot of data and it doesn’t require structure, you should use SharedPreferences. The SharedPreferences APIs allow you to read and write persistent key-value pairs of primitive data types: booleans, floats, ints, longs, and strings.

SharedPreferences is not secure by default—values are stored in an XML file in the application’s file directory. The framework-provided

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