book

Native Mobile Development

by Shaun Lewis, Mike Dunn

November 2019

Intermediate to advanced

394 pages

9h 44m

English

O'Reilly Media, Inc.

Read now

Unlock full access

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
A Note About the State of Mobile Development
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
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
TasksAndroidHow to Create a Custom ViewHow to Use a Custom ViewiOSHow to Create a Custom ViewHow to Use a Custom ViewWhat We’ve Learned
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
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
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
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
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

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
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
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
TasksAndroidSerialize and Deserialize an Object InstanceiOSSerialize and Deserialize an Object InstanceiOS NotesWhat We’ve Learned
TasksAndroidAdd Functionality to Existing APIsiOSAdd Functionality to Existing APIsWhat We’ve Learned
TasksAndroidSet Up and Run Unit TestsSet Up and Run Integration TestsiOSSet Up and Run Unit TestsWhat We’ve Learned
Comparing Native Development to Cross-Platform ToolsWeb-BasedOtherEnvironment SetupAndroid SetupiOS SetupWhat We’ve Learned
Creating a New ProjectAndroid StudioXcodeApp ArchitectureBuilding Our First ScreenAndroidiOSWhat We’ve Learned
Sprucing Up ViewsAndroidiOSAdding a ButtoniOSLists, Lists, and More Lists!Add a New Catalog ViewWiring Up the ButtonBooksPopulating the List ViewAndroidiOSWhat We’ve Learned
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
Detailing Our BooksAndroidiOSSaving Books for LaterAndroidiOSStoring Books for LaterAndroidiOSSaving BooksAndroidWhat We’ve Learned
Searching the WorldAndroidiOSBuilding a Search EndpointInstalling Node and ExpressLocations JSON FileCalling Our ServiceAndroidiOSWhat We’ve Learned

Content preview from Native Mobile Development

Chapter 13. Extensions

Sometimes the functionality provided by Android and iOS just isn’t enough, and sometimes the functionality provided by third-party libraries or internal objects just doesn’t make the cut. Sure, you can subclass, but it’s not always feasible for that to work properly.

Fortunately, both platforms have a means to augment existing objects.

Tasks

In this chapter, you’ll learn to add functionality to existing APIs.

Android

While we have spent the majority of this book defaulting to Java as the language for Android development, and indeed the great majority of Android development does happen in Java, we must now mention that in the Android Framework, only Kotlin is capable of supporting extensions. What does that mean? Let’s define the word “extension” to mean “alter or add functionality to any class.” However, Java classes in a project with Kotlin extensions can take advantage of the extended functionality!

Add Functionality to Existing APIs

In Java, if you import a third-party library for CalendarPicker, you’re pretty much stuck with whatever public API that library provides. Of course, you can alter the source, but at that point you’ve created your own CalendarPicker, which will not be an instance of the same class as the original. You could also subclass CalendarPicker, but the same caveat applies. It is not possible to add or change the existing functionality of the existing CalendarPicker API.

In Kotlin, this is no longer true. Not only could you add ...