Android for Java Programmers

Preface
	Target Audience
	Topics and Teaching Approach
	Content and Explanation
	Latest Code
	Additional Resources for Users and Instructors
	Convention Used in the Book
Acknowledgments
Contents
Chapter 1: Java Review
	1.1 Introduction
	1.2 Language Basics
		1.2.1 Variables
		1.2.2 Type of Variable
		1.2.3 Java Primitive Data Types
			1.2.3.1 Integers
			1.2.3.2 Real Numbers
			1.2.3.3 Char and Boolean
		1.2.4 Default Variable Initializations
		1.2.5 Typecasting
		1.2.6 Type Assignment Example
		1.2.7 Java String Class
			1.2.7.1 String Concatenation
		1.2.8 Java Operators
			1.2.8.1 Associativity Rules
			1.2.8.2 Shorthand Assignment Operators
		1.2.9 Control Flow Statements
		1.2.10 Arrays
		1.2.11 ArrayList
		1.2.12 Java Iterator Interface
		1.2.13 For-Each Loop
	1.3 Object-Oriented Programming Concepts in Java
		1.3.1 Classes
		1.3.2 Objects
			1.3.2.1 Do It Yourself
		1.3.3 Interfaces
			1.3.3.1 Do It Yourself
		1.3.4 Package
		1.3.5 Inheritance
		1.3.6 Inheritance Example
		1.3.7 Polymorphism
			1.3.7.1 Do It Yourself
		1.3.8 Hiding Fields
		1.3.9 Using the Keyword Super
		1.3.10 Subclass Constructors
		1.3.11 Using Preserved Keyword ``this´´
			1.3.11.1 Using this with a Constructor
		1.3.12 Java Exception Handling
			1.3.12.1 The Try-Catch-Finally Block
		1.3.13 Generic Types
			1.3.13.1 A Simple Material Class
			1.3.13.2 A Generic Version of the Material Class
		1.3.14 Type Parameter Naming Conventions
			1.3.14.1 Calling and Instantiating a Generic Type
			1.3.14.2 Multiple Type Parameters
		1.3.15 Autoboxing
		1.3.16 Parameterized Types
		1.3.17 Anonymous Classes
			1.3.17.1 Declaring Anonymous Classes
			1.3.17.2 Syntax of Anonymous Classes
		1.3.18 Object Serialization
			1.3.18.1 Serializable Interface
			1.3.18.2 Serialize an Object
			1.3.18.3 Deserialize an Object
			1.3.18.4 Code Example
			1.3.18.5 Example of Serializing an Object
			1.3.18.6 Example of Deserializing an Object
		1.3.19 Lambda Expressions
		1.3.20 Variable Argument (Varargs)
			1.3.20.1 Syntax of Varargs
			1.3.20.2 Rules for Varargs
	1.4 Chapter Summary
	Further Reading
Chapter 2: Getting Started with Android
	2.1 Introduction
	2.2 Starting with Android
		2.2.1 A Brief Android History
		2.2.2 Android Is Open Source
		2.2.3 Android Libraries
		2.2.4 Android Popularity
		2.2.5 Android Development Environment
		2.2.6 Android Developer´s Skills
		2.2.7 Model View Controller and App Development
		2.2.8 Android´s Main Program
		2.2.9 Java and Android
		2.2.10 Why Use Java for Android?
		2.2.11 Android and Linux
	2.3 Download and Install Android Studio and Android SDK
		2.3.1 Download the Android Studio
		2.3.2 Install Android Studio
		2.3.3 Update Android Files
		2.3.4 Release Note
		2.3.5 Android SDK
	2.4 Create a New Android Project
		2.4.1 Start New Project
		2.4.2 Select an Activity Template
		2.4.3 Fill in Application Requirement
		2.4.4 Define SDK Requirements
		2.4.5 Finish the Project Creation
	2.5 Compiling and Running Android Apps
		2.5.1 Running HelloWorld on Your Phone
		2.5.2 Running the Android App in Android Studio
		2.5.3 Issues Starting First App
		2.5.4 Running HelloWorld on Emulator
		2.5.5 Setting Up the Emulator
		2.5.6 Do It Yourself
	2.6 Compiling, Building, and Packaging Technologies
		2.6.1 Compiling Android Code
			2.6.1.1 Compiling Java Code
			2.6.1.2 Minimizing and Obscuring Code
			2.6.1.3 Turning .class into .dex Bytecode
			2.6.1.4 Packaging DEX Files
		2.6.2 Android App Bundle
		2.6.3 Do It Yourself
		2.6.4 Install Android Apps
		2.6.5 Install APK from Online
		2.6.6 Install APK from Files
		2.6.7 From Dalvik to ART Runtime
		2.6.8 Gradle Build
			2.6.8.1 Gradle Build Files
			2.6.8.2 Build Parameters
		2.6.9 Software Versioning Using Local or Remote Repositories
			2.6.9.1 Create a Git Repository
			2.6.9.2 Integrating with GitHub or Bitbucket
	2.7 Android Stack and Framework
		2.7.1 Android Architecture
		2.7.2 User and System Apps
		2.7.3 Java API Framework
		2.7.4 Native Libraries and Android Runtime
		2.7.5 Hardware Abstraction Layer (HAL)
		2.7.6 Linux Kernel
	2.8 Chapter Summary
	Further Reading
	References
Chapter 3: Your First Android Application
	3.1 Introduction
	3.2 Android App Development
		3.2.1 Early Android Development
		3.2.2 Android Versions
		3.2.3 Android Application Characteristic
		3.2.4 Android Activity
			3.2.4.1 Activity Constructors and Methods
		3.2.5 R File
		3.2.6 Android Context
		3.2.7 Application Manifest Files
		3.2.8 Opening Android Project in Android Studio
		3.2.9 Cleaning Android Project Builds
	3.3 Create Your First Mobile App
		3.3.1 Your App Specification
		3.3.2 Create Activity Layout
			3.3.2.1 Adding an EditText Field to the Layout File
			3.3.2.2 Add String to Resource File
			3.3.2.3 Adding Components to the Layout File
		3.3.3 Invoke Message on Activity
		3.3.4 Intent Class
			3.3.4.1 Explicit Intent
			3.3.4.2 Implicit Intent
		3.3.5 Using StartActivity
		3.3.6 Create Second Activity
			3.3.6.1 R.string and strings.xml File
		3.3.7 Project Manifest Update
			3.3.7.1 Intent-Filter and Launcher Screen
			3.3.7.2 Setting Application Attributes
		3.3.8 Running the App
		3.3.9 Receiving Messages/Data from an Activity
		3.3.10 Responding to the Messages from an Activity
	3.4 Debugging Information
		3.4.1 Debugging Using Log.d()
		3.4.2 Using Logcat to View Log Messages
		3.4.3 Do It Yourself
			3.4.3.1 Exercise 1
			3.4.3.2 Exercise 2
			3.4.3.3 Exercise 3
	3.5 Localize Your App and Resources
		3.5.1 Create a Resource File for Second Language
		3.5.2 Create Resource Entries for Languages Supported
		3.5.3 Set Device Language
	3.6 Chapter Summary
	Further Reading
Chapter 4: Debugging and Testing Using Junit, Espresso, and Mockito Frameworks
	4.1 Introduction
	4.2 The Android Studio Debugger
		4.2.1 Fault Handling Methods
		4.2.2 Enable Debugger
		4.2.3 Inspecting and Modifying Variable Values
		4.2.4 Android Profiler
		4.2.5 Device File Explorer
		4.2.6 Android Debug Bridge (adb)
		4.2.7 Do It Yourself
	4.3 Toast and Snackbar Messages
		4.3.1 Toast Messages
			4.3.1.1 Creating Toast Messages
		4.3.2 Snackbar Messages
			4.3.2.1 Creating Snackbar Messages
		4.3.3 Do It Yourself
		4.3.4 The Log Class and Logcat Window
			4.3.4.1 Logging Class Exception
			4.3.4.2 Using adb with Log Messages
	4.4 Android App Testing
		4.4.1 Create a Test Class
		4.4.2 Assert Methods
		4.4.3 Hamcrest Assert Methods
		4.4.4 Espresso Testing
		4.4.5 Unit Testing
		4.4.6 Unit Testing with Mockito
		4.4.7 Code Coverage
		4.4.8 Code Inspection and Refactoring
		4.4.9 Reverse Engineering
	4.5 Chapter Summary
	Further Reading
	References
Chapter 5: Activity Lifecycle and Passing Objects Between Screens Using Parcelable Interface
	5.1 Introduction
	5.2 Activity States
		5.2.1 Activity and States
		5.2.2 Transition Between States
			5.2.2.1 Do It Yourself
		5.2.3 The Launcher Activity
		5.2.4 Implementing onCreate()
			5.2.4.1 Understanding onCreate()
		5.2.5 Bundle Class
			5.2.5.1 Using Bundle Object with Intent
			5.2.5.2 Bundle Object and Activity States
	5.3 Understanding Activity Lifecycle
		5.3.1 Understanding the onDestroy Method
		5.3.2 Pausing and Resuming an Activity
		5.3.3 Stopping and Restarting an Activity
		5.3.4 Restoring Activity State
			5.3.4.1 onSaveInstanceState()
		5.3.5 Do It Yourself
	5.4 Lifecycle Illustration App
		5.4.1 Lifecycle Callback Methods
		5.4.2 Callback Methods for the MainActivity
		5.4.3 Callback Methods for the DisplayMessageActivity
		5.4.4 Do It Yourself
		5.4.5 Callback Method Implementations
		5.4.6 Trigger the onPause() Method
	5.5 Creating and Using Parcelable Objects
		5.5.1 Passing User-Defined Objects Between Activities
		5.5.2 LifeCycle with Parcelable Object
			5.5.2.1 Parcelable Class Creation
		5.5.3 Parcelable Example
			5.5.3.1 Implement the Parcelable Interface
			5.5.3.2 Declaring the Parcelable.Creator Interface Field
			5.5.3.3 Implementing the describeContents Method
			5.5.3.4 Implementing the writeToParcel Method
			5.5.3.5 CREATOR Interface Constructs a Parcelable Object
			5.5.3.6 Passing a Parcelable Object to Second Activity
			5.5.3.7 Receiving a Parcelable Object from an Activity
			5.5.3.8 Logging Callback Method Invocation
			5.5.3.9 Testing LifecycleParcelable App
	5.6 Chapter Summary
	Further Reading
Chapter 6: User Interface Essential Classes, Layouts, Styles, Themes, and Dimensions
	6.1 Introduction
	6.2 Essential UI Classes and Properties
		6.2.1 Android Project Structure
		6.2.2 Views
			6.2.2.1 View Listeners
			6.2.2.2 View Properties
		6.2.3 View Class Examples
			6.2.3.1 EditText
			6.2.3.2 TextView
		6.2.4 Widget
		6.2.5 ViewGroup
		6.2.6 App Layout
	6.3 Writing XML Layouts
		6.3.1 Declare UI Elements in XML
		6.3.2 Android Studio´s Layout Editor
		6.3.3 Defining UI Programmatically
		6.3.4 LinearLayout Java Class
		6.3.5 LayoutParams Java Class
	6.4 Details of the LayoutApplication Demo
		6.4.1 MainActivity Layout
		6.4.2 Activity with Linear Layout
		6.4.3 Linear Layout XML File
		6.4.4 Using Android Studio Design Option
		6.4.5 strings.xml File
		6.4.6 String Editor
		6.4.7 String Resources
		6.4.8 RelativeLayout
		6.4.9 Other Layouts
			6.4.9.1 FrameLayout
			6.4.9.2 ConstraintLayout
			6.4.9.3 Grid and Table Layouts
		6.4.10 Parent-Child Relationship Between Activities
			6.4.10.1 Do It Yourself
	6.5 Styles, Themes, and Dimension
		6.5.1 Defining a Style File
		6.5.2 Applying Styles
		6.5.3 Defining the App´s Theme
		6.5.4 The Difference Between a Theme and Style
		6.5.5 Padding and Margin View Properties
		6.5.6 Gravity and Weight View Properties
			6.5.6.1 Do It Yourself
		6.5.7 Dimensions of a Phone and UI
			6.5.7.1 Do It Yourself
	6.6 Chapter Summary
	Further Reading
Chapter 7: ListView, ScrollList, Date and Time Pickers, and RecyclerView
	7.1 Introduction
	7.2 List Views
		7.2.1 Adapter and ArrayAdapter Classes
			7.2.1.1 ArrayAdapter Classes
		7.2.2 ListView and ListActivity
			7.2.2.1 Define a Layout for the Items on the List
			7.2.2.2 Create the ListActivity Class
			7.2.2.3 Define Data
			7.2.2.4 Select an Adapter Class
			7.2.2.5 Create an ArrayAdapter Class
			7.2.2.6 Assign the Adapter to List View
			7.2.2.7 Assign a Listener to the List View
			7.2.2.8 Do It Yourself
	7.3 Date and Time Pickers
		7.3.1 Date and Time Pickers
		7.3.2 Set Date Using the DatePicker
			7.3.2.1 The DatePickerDialog Class
			7.3.2.2 The OnDateSetListener Interface
		7.3.3 Set Time Using the TimePicker
			7.3.3.1 TimePickerDialog Class
			7.3.3.2 OnTimeSetListener Interface
			7.3.3.3 The Calendar Class
		7.3.4 Pickers and Anonymous Classes
	7.4 Scroll Views
		7.4.1 The ScrollView Class
		7.4.2 Top-Level XML Element for a Scroll View
		7.4.3 Scroll View Activity
	7.5 RecyclerView
		7.5.1 Using RecyclerView, Adapter, and ViewHolder Classes
			7.5.1.1 Create Objects for Rows in the List
			7.5.1.2 A Layout File for Rows in the List
			7.5.1.3 RecyclerViewActivity Layout
			7.5.1.4 Data Model
			7.5.1.5 RecyclerView.Adapter Class
		7.5.2 RecyclerViewActivity
		7.5.3 Adapter and ViewHolder
			7.5.3.1 ArrayAdapter
			7.5.3.2 onCreateViewHolder
			7.5.3.3 LayoutInflater and Adapter Class
			7.5.3.4 The Inflate Method
			7.5.3.5 ViewHolder
			7.5.3.6 onBindViewHolder
			7.5.3.7 getItemCount()
			7.5.3.8 Recycler View Class Diagram
		7.5.4 Using Recycler View with Older SDKs
	7.6 Chapter Summary
	Further Reading
Chapter 8: Toolbar, Menu, Dialog Boxes, Shared Preferences, Implicit Intent, and Directory Structure
	8.1 Introduction
	8.2 More User Interface
		8.2.1 ActionBar
		8.2.2 Toolbar
		8.2.3 Add androidx.appcompat Library to the Project
			8.2.3.1 Add the Support Library to the build.gradle
			8.2.3.2 Import Toolbar
		8.2.4 Extending AppCompatActivity
		8.2.5 Specify a Theme with NO ActionBar
		8.2.6 Adding Toolbar Element to the Layout
		8.2.7 Menu Interface
		8.2.8 Options Menu and App Bar
			8.2.8.1 Menu Inflater and Click Handling
			8.2.8.2 Define Menu XML File
			8.2.8.3 Menu Item Properties
			8.2.8.4 orderInCategory Attribute
			8.2.8.5 Methods from the Activity Class for Menu
				8.2.8.5.1 onCreateOptionsMenu(Menu menu)
				8.2.8.5.2 onMenuItemSelected(MenuItem menuItem)
			8.2.8.6 Toolbar Summary
		8.2.9 Context Menu
		8.2.10 Popup Menu
	8.3 Dialog Boxes and the Camera App
		8.3.1 Dialog Boxes
		8.3.2 Custom Dialog Boxes
		8.3.3 Access a Phone´s Default Camera App
		8.3.4 Starting Activities for Results
			8.3.4.1 Do It Yourself
		8.3.5 Activity Result in AndroidX
	8.4 Saving Data with SharedPreferences
		8.4.1 SharedPreferences Interface
			8.4.1.1 SharedPreferences Creation and Use
			8.4.1.2 Editor Interface
			8.4.1.3 Commit Method
			8.4.1.4 SharedPreferences Reading Methods
			8.4.1.5 Changes to Our Demo App
			8.4.1.6 Running and Testing the Demo App
		8.4.2 Layout for Shared Preferences Activity
		8.4.3 How SharedPreferencesActivity Code Works
			8.4.3.1 OnCreate()
			8.4.3.2 loadUserData()
			8.4.3.3 Update SharedPreferences Content
			8.4.3.4 Saving Data in a Shared Preferences XML File
			8.4.3.5 Do it Yourself
	8.5 Directory Structure and Saving Data in Files
		8.5.1 Internal Storage Location
		8.5.2 External Storage Location
		8.5.3 Standard Public Directories for Data/Files
			8.5.3.1 Access Internal Files
			8.5.3.2 Accessing Files You Create
		8.5.4 Android File IO Classes and Methods
		8.5.5 Accessing External Storage Files
		8.5.6 Permission to Access External Directory
		8.5.7 Examples Using External Methods
			8.5.7.1 getExternalFilesDir
			8.5.7.2 getExternalStorageDirectory
		8.5.8 Environment Class and getExternalStoragePublicDirectory
			8.5.8.1 Environment.DIRECTORY_DCIM
			8.5.8.2 Environment.getExternalStorageDirectory
			8.5.8.3 Environment.DIRECTORY_DOWNLOADS
			8.5.8.4 Environment.getRootDirectory
		8.5.9 Locate Apps on Emulator File System
			8.5.9.1 Do It Yourself
	8.6 Chapter Summary
	Further Reading
Chapter 9: Fragments, Dynamic Binding, Inheritance, Pinching, and Screen Swiping
	9.1 Introduction
	9.2 The Fragment Basics
		9.2.1 Fragment Uses
		9.2.2 Why Using Fragments
		9.2.3 Fragment Lifecycle
			9.2.3.1 Activity Lifecycle Impacts on Fragments
			9.2.3.2 Fragments Extra Lifecycle Callbacks
			9.2.3.3 Overriding Fragment Callback Methods
	9.3 Creating an App with the Fragments
		9.3.1 Create a Fragment
		9.3.2 One Activity and Multiple Layouts
		9.3.3 Detecting Device Size and Orientation
		9.3.4 Fragment Development Steps in Details
			9.3.4.1 Extending Fragment Class
			9.3.4.2 Implement the onCreateView Method
			9.3.4.3 The onCreateView Method Signature
			9.3.4.4 Implement Other Methods
			9.3.4.5 Using FragmentManager and FragmentTransaction Classes
			9.3.4.6 Creating Layout Files
			9.3.4.7 Creating Layout and Fragment Classes
			9.3.4.8 Attaching Proper Layout to the Device View
			9.3.4.9 Communication Between Fragment and Its Host Activity
		9.3.5 The MainActivity Class and Demo App Demonstration
			9.3.5.1 Do It Yourself
		9.3.6 Inserting Fragments in the Activity
			9.3.6.1 Dynamic Binding
			9.3.6.2 Static Binding
		9.3.7 Fragment Static Binding Example
	9.4 Inheritance in Android
		9.4.1 Create a Base Activity
			9.4.1.1 onViewReady
			9.4.1.2 getContentView
			9.4.1.3 Toolbar
		9.4.2 Layout for the BaseActivity
		9.4.3 No onCreate() Method for Child Class
		9.4.4 Layout Reuse
	9.5 Density-Independent Pixel and Screen Sizes
		9.5.1 Naming Scheme
		9.5.2 Supporting Different Screen Sizes
			9.5.2.1 Create Directory Using Android Studio
		9.5.3 Density-Independent Pixel (dp)
			9.5.3.1 Various Drawable Sizes
	9.6 Pinching and Screen Swiping
		9.6.1 Pinch to Zoom Image
			9.6.1.1 Do It Yourself
		9.6.2 Swiping Gesture
		9.6.3 Swiping Gesture App
			9.6.3.1 Do It Yourself
	9.7 Chapter Summary
	Further Reading
Chapter 10: Parsing Remote XML and JSON Files, Using HTTPUrlConnection, XmlPullParser, and AsyncTask
	10.1 Introduction
	10.2 Parsing Remote and Local XML Files
		10.2.1 XML Parser Review
		10.2.2 Push Parsing
			10.2.2.1 Push Parser Iterator
		10.2.3 Pull Parser
		10.2.4 Remote XML Parsing
			10.2.4.1 Input File
			10.2.4.2 Parser Instantiation Using XmlPullParser Class
			10.2.4.3 Connecting to Server Using HTTPUrlConnection
		10.2.5 Parsing Events
			10.2.5.1 Parsing Loop
		10.2.6 Reading Image from Local File
		10.2.7 Retrieving Image from Remote Server
		10.2.8 An Example of Reading Image File
		10.2.9 A Demo App
			10.2.9.1 Spinner Initialization and Handling
			10.2.9.2 Predefined Layouts
		10.2.10 Parsing Local XML File
		10.2.11 Asset Folder
	10.3 AsyncTask and Thread Handling
		10.3.1 AsyncTask Class
		10.3.2 Using AsyncTask Class
		10.3.3 AsyncTask and Varargs Type
		10.3.4 Input, Progress, and Result Parameters to AsyncTask
		10.3.5 AsyncTask Execute Methods
		10.3.6 AsyncTask Method Sequence Calls
	10.4 App Implementation Details
		10.4.1 WeatherForecast Class
			10.4.1.1 Weather URL
			10.4.1.2 doInBackground()
			10.4.1.3 onProgressUpdate( )
			10.4.1.4 onPostExecute( )
		10.4.2 Complete Code for Weather Network App Activity
			10.4.2.1 Do It Yourself
		10.4.3 Parsing JSON Files
		10.4.4 Other XML Feeds
	10.5 An App for Information on Covid-19
		10.5.1 Covid-19 App Development Steps
		10.5.2 Data Extraction and Conversion
		10.5.3 Testing and Production Development Environments
		10.5.4 Covid-19 Source Code and Class Structure
	10.6 Chapter Summary
	Further Reading
Chapter 11: Android SQLite, Firebase, and Room Databases
	11.1 Introduction
	11.2 The Android SQLite Database
		11.2.1 SQLiteOpenHelper Class
		11.2.2 SQLiteDatabase Class
		11.2.3 Overriding Methods of the SQLiteOpenHelper Class
		11.2.4 The Class Constructor Method
		11.2.5 The onCreate() Method
			11.2.5.1 Create Table in Database
		11.2.6 onUpgrade Method
		11.2.7 onDowngrade Method
		11.2.8 onOpen() Method
		11.2.9 Read and Read/Write Access
		11.2.10 The execSQL Method from SQLiteDatabase Class
	11.3 Content Values and Cursor Objects
		11.3.1 Content Values and Insert Method
			11.3.1.1 Do It Yourself
		11.3.2 Cursor
		11.3.3 Query Data
		11.3.4 rawQuery
		11.3.5 More Methods of the SQLiteDatabase Class
			11.3.5.1 Replace Method
			11.3.5.2 Update Method
			11.3.5.3 Delete Method
	11.4 DatabaseDemo Project
		11.4.1 The Data Component
		11.4.2 The Middle Component
		11.4.3 The View Component
		11.4.4 Test Your Database Using SQLiteBrowser
			11.4.4.1 Locate Your App Database
			11.4.4.2 Open Your Database with SQLiteBrowser
			11.4.4.3 Test Your Database with SQLiteBrowser
		11.4.5 Use SQLiteBrowser for Database Design
			11.4.5.1 Sqlite3 Database Tool
			11.4.5.2 Do It Yourself
		11.4.6 Android Database Inspector
	11.5 Realtime Firebase Database
		11.5.1 Firebase and JSON Tree File
		11.5.2 Firebase Account and Project Setup
		11.5.3 Register Your Project Using the Firebase Console
		11.5.4 Adding Dependency to Your Project
		11.5.5 Connecting to Database
		11.5.6 Inserting Data into Database
		11.5.7 Retrieving Data from Database
		11.5.8 Deleting Data from Database
		11.5.9 Query Data from Database
		11.5.10 DataSnapshot and Query Classes
		11.5.11 ChildEventListener Interface
		11.5.12 Querying Firebase Database Using User-Defined Classes
		11.5.13 Querying Firebase Database Example
	11.6 Other Data Storage Options
		11.6.1 Room Database
			11.6.1.1 Entity Class
			11.6.1.2 DAO Interface
			11.6.1.3 Database Class
			11.6.1.4 App Room Database Class
			11.6.1.5 Do It Yourself
		11.6.2 Content Provider
		11.6.3 Internal and External Storage
			11.6.3.1 Device File System
			11.6.3.2 SD Card, USB Storage, and Standard Public Directories
	11.7 Chapter Summary
	Further Reading
	References
Chapter 12: Content Provider, Service, Message Broadcasting, and Multimedia Player
	12.1 Introduction
	12.2 Content Provider Component
		12.2.1 Content Provider
		12.2.2 Creating a Content Provider
			12.2.2.1 Designing a URI
			12.2.2.2 onCreate Method Implementation
			12.2.2.3 Query Method Implementation
			12.2.2.4 Insert Method Implementation
			12.2.2.5 Update Method Implementation
			12.2.2.6 Delete Method Implementation
			12.2.2.7 getType Method Implementation
			12.2.2.8 ContentProvider Code Example
		12.2.3 Provider in Manifest File
		12.2.4 Run and Test Content Provider
			12.2.4.1 Do It Yourself
		12.2.5 Content Provider Client
			12.2.5.1 Do It Yourself
	12.3 Media Content Streaming Apps
	12.4 Android Service
		12.4.1 Service
		12.4.2 Communication with Service
		12.4.3 Services Lifecycle
		12.4.4 Creating Service
			12.4.4.1 OnStartCommand()
			12.4.4.2 Service and Threads
			12.4.4.3 Starting Service with the Intent
				12.4.4.3.1 Service and Intent-Filter
				12.4.4.3.2 Intent-Filter and Activity
		12.4.5 Service Binding
			12.4.5.1 Allow Apps to Bind to Service
			12.4.5.2 Prohibit Apps to Bind to Service
		12.4.6 OnCreate() Method for Service
		12.4.7 OnDestroy() Method
		12.4.8 Stopping Service
		12.4.9 Android Rules to End Service
		12.4.10 Declaring a Service in the Manifest
		12.4.11 Intent Service
		12.4.12 Service Summary
		12.4.13 Do It Yourself
	12.5 Message Broadcasting in Android
		12.5.1 Android Message Broadcasting Types
		12.5.2 BroadcastReceiver Class
			12.5.2.1 Create a BroadcastReceiver Object
			12.5.2.2 BroadcastReceiver Registration
			12.5.2.3 Using the sendBroadcast Method
			12.5.2.4 Receiving Broadcasted Message
		12.5.3 Do It Yourself
	12.6 Android MediaPlayer for Streaming Radio Stations
		12.6.1 App Structure
		12.6.2 Android Media Player
		12.6.3 Power Manager and WakeLock
		12.6.4 WifiLock
		12.6.5 Other App Components
		12.6.6 Stopping and Restarting Service
		12.6.7 The New Restriction on Background Service
		12.6.8 Do It Yourself
	12.7 Remote and Local Video Playback
		12.7.1 Playback Video Using Implicit Intent and URL
		12.7.2 Playback Live Streaming Video Using URL and VideoView
		12.7.3 Playback Embedded Video in Your App
		12.7.4 Playback Video Outside Your App Directory
	12.8 Chapter Summary
	Further Reading
Chapter 13: Sensors, Location-Based Service, and Google Maps
	13.1 Introduction
	13.2 Android Sensor
		13.2.1 Accelerometer Sensor
		13.2.2 Accelerometer App
		13.2.3 Using Accelerometer
			13.2.3.1 Sensor Event Listener Implementation
			13.2.3.2 Getting Sensor Service and Sensor Manager Objects
			13.2.3.3 Display Accelerometer Readings
			13.2.3.4 Calculating Acceleration Force
			13.2.3.5 Listener Registration
			13.2.3.6 Unregister Listening
		13.2.4 Get List of Sensors
		13.2.5 Do It Yourself
	13.3 Location-Based Services
		13.3.1 Demo App Interface
		13.3.2 Location Service APIs
		13.3.3 App Development Steps
			13.3.3.1 Permission
			13.3.3.2 Obtaining Location Manager
			13.3.3.3 Obtaining Location Providers
			13.3.3.4 Geocoder
			13.3.3.5 Register LocationListener
		13.3.4 App Implementation Details
			13.3.4.1 Check and Request Permission
			13.3.4.2 Location Manager Setup
			13.3.4.3 Specify Location Provider
			13.3.4.4 Find Your Last Location
			13.3.4.5 Refresh Current Location
			13.3.4.6 Do It Yourself
			13.3.4.7 Use Geocoding
		13.3.5 Revising Weather App
		13.3.6 Do It Yourself
	13.4 Use Google Maps in Your App
		13.4.1 Create a Google Maps Project
		13.4.2 Obtaining App Key
		13.4.3 Update Manifest File
		13.4.4 Google Maps API
		13.4.5 GoogleMap Class
		13.4.6 OnMapReadyCallback Interface
		13.4.7 SupportMapFragment Class
		13.4.8 Map Fragment Layout Example
		13.4.9 MapView
		13.4.10 UiSettings
		13.4.11 Configure Initial State
		13.4.12 Setting Map Initial State Programmatically
		13.4.13 Covid App Revised
	13.5 Chapter Summary
	Further Reading
	References
Index