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 3. Custom Components

While both Android and iOS provide a large number of widgets and components out of the box, there’s not always parity, and it’s very likely you’ll want to create your own at some point. You might want a date or color picker with custom look or behavior, a switch or toggle with a built-in label, data visualization components like charts and graphs, or something as simple as a configurable label and icon that’s suited just for your app.

Whatever the need, there’s a pretty good chance you can create it in either framework—but the process is very different and can be surprisingly arcane.

Tasks

In this chapter, you’ll learn:

How to create a custom view.
How to use a custom view.

Android

Since most layouts in Android apps are created with XML data, getting your custom component to accept and react appropriately to arbitrary properties is something you’ll probably want to offer. For example, if you were to create a custom color picker, you’d probably want to offer a default color to start with, or perhaps even a specific color space like HSL or RGB.

Since XML resources are compiled, you’ll need to make sure the system recognizes the extra properties you allow on your component and what values are valid. For example, if you add a color attribute, you wouldn’t want to accept a dimension value—you’d want only valid colors, or perhaps color resource IDs, to be accepted. If a user tries to enter an invalid value format, the program will fail to compile, ...