book

Android Studio 4.0 Development Essentials - Java Edition

Name: Android Studio 4.0 Development Essentials - Java Edition
Author: Neil Smyth
ISBN: 9781800562660

by Neil Smyth

September 2020

Intermediate to advanced

795 pages

22h 39m

English

Packt Publishing

Read now

Unlock full access

1. Introduction
1.1 Downloading the Code Samples1.2 Feedback1.3 Errata
2. Setting up an Android Studio Development Environment
2.1 System Requirements2.2 Downloading the Android Studio Package2.3 Installing Android Studio2.3.1 Installation on Windows2.3.2 Installation on macOS2.3.3 Installation on Linux2.4 The Android Studio Setup Wizard2.5 Installing Additional Android SDK Packages2.6 Making the Android SDK Tools Command-line Accessible2.6.1 Windows 72.6.2 Windows 8.12.6.3 Windows 102.6.4 Linux2.6.5 macOS2.7 Android Studio Memory Management2.8 Updating Android Studio and the SDK2.9 Summary
3. Creating an Example Android App in Android Studio
3.1 About the Project3.2 Creating a New Android Project3.3 Creating an Activity3.4 Defining the Project and SDK Settings3.5 Modifying the Example Application3.6 Modifying the User Interface 3.7 Reviewing the Layout and Resource Files3.8 Adding Interaction3.9 Summary
4. Creating an Android Virtual Device (AVD) in Android Studio
4.1 About Android Virtual Devices4.2 Creating a New AVD4.3 Starting the Emulator4.4 Running the Application in the AVD4.5 Stopping a Running Application4.6 Supporting Dark Theme4.7 AVD Command-line Creation4.8 Android Virtual Device Configuration Files4.9 Moving and Renaming an Android Virtual Device4.10 Summary
5. Using and Configuring the Android Studio AVD Emulator
5.1 The Emulator Environment5.2 The Emulator Toolbar Options5.3 Working in Zoom Mode5.4 Resizing the Emulator Window5.5 Extended Control Options5.5.1 Location5.5.2 Displays5.5.3 Cellular5.5.4 Camera5.5.5 Battery5.5.6 Phone5.5.7 Directional Pad5.5.8 Microphone5.5.9 Fingerprint5.5.10 Virtual Sensors5.5.11 Snapshots5.5.12 Record and Playback5.5.13 Google Play5.5.14 Settings5.5.15 Help5.6 Working with Snapshots5.7 Configuring Fingerprint Emulation5.8 Summary
6. A Tour of the Android Studio User Interface
6.1 The Welcome Screen6.2 The Main Window6.3 The Tool Windows6.4 Android Studio Keyboard Shortcuts6.5 Switcher and Recent Files Navigation6.6 Changing the Android Studio Theme6.7 Summary
7. Testing Android Studio Apps on a Physical Android Device
7.1 An Overview of the Android Debug Bridge (ADB)7.2 Enabling ADB on Android based Devices7.2.1 macOS ADB Configuration7.2.2 Windows ADB Configuration7.2.3 Linux adb Configuration7.3 Testing the adb Connection7.4 Summary
8. The Basics of the Android Studio Code Editor
8.1 The Android Studio Editor8.2 Splitting the Editor Window8.3 Code Completion8.4 Statement Completion8.5 Parameter Information8.6 Parameter Name Hints8.7 Code Generation8.8 Code Folding8.9 Quick Documentation Lookup8.10 Code Reformatting8.11 Finding Sample Code8.12 Live Templates8.13 Summary
9. An Overview of the Android Architecture
9.1 The Android Software Stack9.2 The Linux Kernel9.3 Android Runtime – ART9.4 Android Libraries9.4.1 C/C++ Libraries9.5 Application Framework9.6 Applications9.7 Summary
10. The Anatomy of an Android Application
10.1 Android Activities10.2 Android Fragments10.3 Android Intents10.4 Broadcast Intents10.5 Broadcast Receivers10.6 Android Services10.7 Content Providers10.8 The Application Manifest10.9 Application Resources10.10 Application Context10.11 Summary

11. An Overview of Android View Binding
11.1 Find View by ID11.2 View Bindings 11.3 Converting the AndroidSample Project11.4 Enabling View Binding11.5 Using View Bindings11.6 Choosing an Option11.7 Summary
12. Understanding Android Application and Activity Lifecycles
12.1 Android Applications and Resource Management12.2 Android Process States12.2.1 Foreground Process12.2.2 Visible Process12.2.3 Service Process12.2.4 Background Process12.2.5 Empty Process12.3 Inter-Process Dependencies 12.4 The Activity Lifecycle12.5 The Activity Stack12.6 Activity States12.7 Configuration Changes12.8 Handling State Change12.9 Summary
13. Handling Android Activity State Changes
13.1 New vs. Old Lifecycle Techniques13.2 The Activity and Fragment Classes13.3 Dynamic State vs. Persistent State13.4 The Android Lifecycle Methods13.5 Lifetimes13.6 Foldable Devices and Multi-Resume13.7 Disabling Configuration Change Restarts13.8 Lifecycle Method Limitations13.9 Summary
14. Android Activity State Changes by Example
14.1 Creating the State Change Example Project14.2 Designing the User Interface14.3 Overriding the Activity Lifecycle Methods14.4 Filtering the Logcat Panel14.5 Running the Application14.6 Experimenting with the Activity14.7 Summary
15. Saving and Restoring the State of an Android Activity
15.1 Saving Dynamic State15.2 Default Saving of User Interface State15.3 The Bundle Class15.4 Saving the State15.5 Restoring the State15.6 Testing the Application15.7 Summary
16. Understanding Android Views, View Groups and Layouts
16.1 Designing for Different Android Devices16.2 Views and View Groups16.3 Android Layout Managers16.4 The View Hierarchy16.5 Creating User Interfaces16.6 Summary
17. A Guide to the Android Studio Layout Editor Tool
17.1 Basic vs. Empty Activity Templates17.2 The Android Studio Layout Editor17.3 Design Mode17.4 The Palette17.5 Design Mode and Layout Views17.6 Code Mode17.7 Split Mode17.8 Setting Attributes17.9 Converting Views17.10 Displaying Sample Data17.11 Creating a Custom Device Definition17.12 Changing the Current Device17.13 Layout Validation (Multi Preview)17.14 Summary
18. A Guide to the Android ConstraintLayout
18.1 How ConstraintLayout Works18.1.1 Constraints18.1.2 Margins18.1.3 Opposing Constraints18.1.4 Constraint Bias18.1.5 Chains18.1.6 Chain Styles18.2 Baseline Alignment18.3 Working with Guidelines18.4 Configuring Widget Dimensions18.5 Working with Barriers18.6 Ratios18.7 ConstraintLayout Advantages18.8 ConstraintLayout Availability18.9 Summary
19. A Guide to using ConstraintLayout in Android Studio
19.1 Design and Layout Views19.2 Autoconnect Mode19.3 Inference Mode19.4 Manipulating Constraints Manually19.5 Adding Constraints in the Inspector19.6 Viewing Constraints in the Attributes Window19.7 Deleting Constraints19.8 Adjusting Constraint Bias19.9 Understanding ConstraintLayout Margins19.10 The Importance of Opposing Constraints and Bias19.11 Configuring Widget Dimensions19.12 Adding Guidelines19.13 Adding Barriers19.14 Widget Group Alignment and Distribution19.15 Converting other Layouts to ConstraintLayout19.16 Summary
20. Working with ConstraintLayout Chains and Ratios in Android Studio
20.1 Creating a Chain20.2 Changing the Chain Style20.3 Spread Inside Chain Style20.4 Packed Chain Style20.5 Packed Chain Style with Bias20.6 Weighted Chain20.7 Working with Ratios20.8 Summary
21. An Android Studio Layout Editor ConstraintLayout Tutorial
21.1 An Android Studio Layout Editor Tool Example21.2 Creating a New Activity21.3 Preparing the Layout Editor Environment21.4 Adding the Widgets to the User Interface21.5 Adding the Constraints21.6 Testing the Layout21.7 Using the Layout Inspector21.8 Summary
22. Manual XML Layout Design in Android Studio
22.1 Manually Creating an XML Layout22.2 Manual XML vs. Visual Layout Design22.3 Summary
23. Managing Constraints using Constraint Sets
23.1 Java Code vs. XML Layout Files23.2 Creating Views23.3 View Attributes23.4 Constraint Sets23.4.1 Establishing Connections23.4.2 Applying Constraints to a Layout23.4.3 Parent Constraint Connections23.4.4 Sizing Constraints23.4.5 Constraint Bias23.4.6 Alignment Constraints23.4.7 Copying and Applying Constraint Sets23.4.8 ConstraintLayout Chains23.4.9 Guidelines23.4.10 Removing Constraints23.4.11 Scaling23.4.12 Rotation23.5 Summary
24. An Android ConstraintSet Tutorial
24.1 Creating the Example Project in Android Studio24.2 Adding Views to an Activity24.3 Setting View Attributes24.4 Creating View IDs24.5 Configuring the Constraint Set24.6 Adding the EditText View24.7 Converting Density Independent Pixels (dp) to Pixels (px)24.8 Summary
25. A Guide to using Apply Changes in Android Studio
25.1 Introducing Apply Changes25.2 Understanding Apply Changes Options25.3 Using Apply Changes25.4 Configuring Apply Changes Fallback Settings25.5 An Apply Changes Tutorial25.6 Using Apply Code Changes25.7 Using Apply Changes and Restart Activity25.8 Using Run App25.9 Summary
26. An Overview and Example of Android Event Handling
26.1 Understanding Android Events26.2 Using the android:onClick Resource26.3 Event Listeners and Callback Methods26.4 An Event Handling Example26.5 Designing the User Interface26.6 The Event Listener and Callback Method26.7 Consuming Events26.8 Summary
27. Android Touch and Multi-touch Event Handling
27.1 Intercepting Touch Events27.2 The MotionEvent Object27.3 Understanding Touch Actions27.4 Handling Multiple Touches27.5 An Example Multi-Touch Application27.6 Designing the Activity User Interface27.7 Implementing the Touch Event Listener27.8 Running the Example Application27.9 Summary
28. Detecting Common Gestures using the Android Gesture Detector Class
28.1 Implementing Common Gesture Detection28.2 Creating an Example Gesture Detection Project28.3 Implementing the Listener Class28.4 Creating the GestureDetectorCompat Instance28.5 Implementing the onTouchEvent() Method28.6 Testing the Application28.7 Summary
29. Implementing Custom Gesture and Pinch Recognition on Android
29.1 The Android Gesture Builder Application29.2 The GestureOverlayView Class29.3 Detecting Gestures29.4 Identifying Specific Gestures29.5 Installing and Running the Gesture Builder Application29.6 Creating a Gestures File29.7 Creating the Example Project29.8 Extracting the Gestures File from the SD Card29.9 Adding the Gestures File to the Project29.10 Designing the User Interface29.11 Loading the Gestures File29.12 Registering the Event Listener29.13 Implementing the onGesturePerformed Method29.14 Testing the Application29.15 Configuring the GestureOverlayView29.16 Intercepting Gestures29.17 Detecting Pinch Gestures29.18 A Pinch Gesture Example Project29.19 Summary
30. An Introduction to Android Fragments
30.1 What is a Fragment?30.2 Creating a Fragment30.3 Adding a Fragment to an Activity using the Layout XML File30.4 Adding and Managing Fragments in Code30.5 Handling Fragment Events30.6 Implementing Fragment Communication30.7 Summary
31. Using Fragments in Android Studio - An Example
31.1 About the Example Fragment Application31.2 Creating the Example Project31.3 Creating the First Fragment Layout31.4 Adding the Second Fragment31.5 Adding the Fragments to the Activity31.6 Making the Toolbar Fragment Talk to the Activity31.7 Making the Activity Talk to the Text Fragment31.8 Testing the Application31.9 Summary
32. Modern Android App Architecture with Jetpack
32.1 What is Android Jetpack?32.2 The “Old” Architecture32.3 Modern Android Architecture32.4 The ViewModel Component32.5 The LiveData Component32.6 ViewModel Saved State32.7 LiveData and Data Binding32.8 Android Lifecycles32.9 Repository Modules32.10 Summary
33. An Android Jetpack ViewModel Tutorial
33.1 About the Project33.2 Creating the ViewModel Example Project33.3 Reviewing the Project33.3.1 The Main Activity33.3.2 The Content Fragment33.3.3 The ViewModel33.4 Designing the Fragment Layout33.5 Implementing the View Model33.6 Associating the Fragment with the View Model33.7 Modifying the Fragment33.8 Accessing the ViewModel Data33.9 Testing the Project33.10 Summary
34. An Android Jetpack LiveData Tutorial
34.1 LiveData - A Recap34.2 Adding LiveData to the ViewModel34.3 Implementing the Observer34.4 Summary
35. An Overview of Android Jetpack Data Binding
35.1 An Overview of Data Binding35.2 The Key Components of Data Binding35.2.1 The Project Build Configuration35.2.2 The Data Binding Layout File35.2.3 The Layout File Data Element35.2.4 The Binding Classes35.2.5 Data Binding Variable Configuration35.2.6 Binding Expressions (One-Way)35.2.7 Binding Expressions (Two-Way)35.2.8 Event and Listener Bindings35.3 Summary
36. An Android Jetpack Data Binding Tutorial
36.1 Removing the Redundant Code36.2 Enabling Data Binding36.3 Adding the Layout Element36.4 Adding the Data Element to Layout File36.5 Working with the Binding Class36.6 Assigning the ViewModel Instance to the Data Binding Variable36.7 Adding Binding Expressions36.8 Adding the Conversion Method36.9 Adding a Listener Binding36.10 Testing the App36.11 Summary
37. An Android ViewModel Saved State Tutorial
37.1 Understanding ViewModel State Saving37.2 Implementing ViewModel State Saving37.3 Saving and Restoring State37.4 Adding Saved State Support to the ViewModelDemo Project37.5 Summary
38. Working with Android Lifecycle-Aware Components
38.1 Lifecycle Awareness38.2 Lifecycle Owners38.3 Lifecycle Observers38.4 Lifecycle States and Events38.5 Summary
39. An Android Jetpack Lifecycle Awareness Tutorial
39.1 Creating the Example Lifecycle Project39.2 Creating a Lifecycle Observer39.3 Adding the Observer39.4 Testing the Observer39.5 Creating a Lifecycle Owner39.6 Testing the Custom Lifecycle Owner39.7 Summary
40. An Overview of the Navigation Architecture Component
40.1 Understanding Navigation40.2 Declaring a Navigation Host40.3 The Navigation Graph40.4 Accessing the Navigation Controller40.5 Triggering a Navigation Action40.6 Passing Arguments40.7 Summary
41. An Android Jetpack Navigation Component Tutorial
41.1 Creating the NavigationDemo Project41.2 Adding Navigation to the Build Configuration41.3 Creating the Navigation Graph Resource File41.4 Declaring a Navigation Host41.5 Adding Navigation Destinations41.6 Designing the Destination Fragment Layouts41.7 Adding an Action to the Navigation Graph41.8 Implement the OnFragmentInteractionListener41.9 Triggering the Action41.10 Passing Data Using Safeargs41.11 Summary
42. Creating and Managing Overflow Menus on Android
42.1 The Overflow Menu42.2 Creating an Overflow Menu42.3 Displaying an Overflow Menu42.4 Responding to Menu Item Selections42.5 Creating Checkable Item Groups42.6 Menus and the Android Studio Menu Editor42.7 Creating the Example Project42.8 Designing the Menu42.9 Modifying the onOptionsItemSelected() Method42.10 Testing the Application42.11 Summary
43. An Introduction to MotionLayout
43.1 An Overview of MotionLayout43.2 MotionLayout43.3 MotionScene43.4 Configuring ConstraintSets43.5 Custom Attributes43.6 Triggering an Animation43.7 Arc Motion43.8 Keyframes43.8.1 Attribute Keyframes43.8.2 Position Keyframes43.9 Time Linearity43.10 KeyTrigger43.11 Cycle and Time Cycle Keyframes43.12 Starting an Animation from Code43.13 Summary
44. An Android MotionLayout Editor Tutorial
44.1 Creating the MotionLayoutDemo Project44.2 ConstraintLayout to MotionLayout Conversion44.3 Configuring Start and End Constraints44.4 Previewing the MotionLayout Animation44.5 Adding an OnClick Gesture44.6 Adding an Attribute Keyframe to the Transition44.7 Adding a CustomAttribute to a Transition44.8 Adding Position Keyframes44.9 Summary
45. A MotionLayout KeyCycle Tutorial
45.1 An Overview of Cycle Keyframes45.2 Using the Cycle Editor45.3 Creating the KeyCycleDemo Project45.4 Configuring the Start and End Constraints45.5 Creating the Cycles45.6 Previewing the Animation45.7 Adding the KeyFrameSet to the MotionScene45.8 Summary
46. Working with the Floating Action Button and Snackbar
46.1 The Material Design46.2 The Design Library46.3 The Floating Action Button (FAB) 46.4 The Snackbar46.5 Creating the Example Project46.6 Reviewing the Project46.7 Removing Navigation Features46.8 Changing the Floating Action Button46.9 Adding the ListView to the Content Layout46.10 Adding Items to the ListView46.11 Adding an Action to the Snackbar46.12 Summary
47. Creating a Tabbed Interface using the TabLayout Component
47.1 An Introduction to the ViewPager47.2 An Overview of the TabLayout Component47.3 Creating the TabLayoutDemo Project47.4 Creating the First Fragment47.5 Duplicating the Fragments47.6 Adding the TabLayout and ViewPager47.7 Creating the Pager Adapter47.8 Performing the Initialization Tasks47.9 Testing the Application47.10 Customizing the TabLayout47.11 Displaying Icon Tab Items47.12 Summary
48. Working with the RecyclerView and CardView Widgets
48.1 An Overview of the RecyclerView48.2 An Overview of the CardView48.3 Summary
49. An Android RecyclerView and CardView Tutorial
49.1 Creating the CardDemo Project49.2 Modifying the Basic Activity Project49.3 Designing the CardView Layout49.4 Adding the RecyclerView49.5 Creating the RecyclerView Adapter49.6 Adding the Image Files49.7 Initializing the RecyclerView Component49.8 Testing the Application49.9 Responding to Card Selections49.10 Summary
50. A Layout Editor Sample Data Tutorial
50.1 Adding Sample Data to a Project50.2 Using Custom Sample Data50.3 Summary
51. Working with the AppBar and Collapsing Toolbar Layouts
51.1 The Anatomy of an AppBar51.2 The Example Project51.3 Coordinating the RecyclerView and Toolbar51.4 Introducing the Collapsing Toolbar Layout51.5 Changing the Title and Scrim Color51.6 Summary
52. An Android Studio Master/Detail Flow Tutorial
52.1 The Master/Detail Flow52.2 Creating a Master/Detail Flow Activity52.3 The Anatomy of the Master/Detail Flow Template52.4 Modifying the Master/Detail Flow Template52.5 Changing the Content Model52.6 Changing the Detail Pane52.7 Modifying the WebsiteDetailFragment Class52.8 Modifying the WebsiteListActivity Class52.9 Adding Manifest Permissions52.10 Running the Application52.11 Summary
53. An Overview of Android Intents
53.1 An Overview of Intents53.2 Explicit Intents53.3 Returning Data from an Activity53.4 Implicit Intents53.5 Using Intent Filters53.6 Checking Intent Availability53.7 Summary
54. Android Explicit Intents – A Worked Example
54.1 Creating the Explicit Intent Example Application54.2 Designing the User Interface Layout for MainActivity54.3 Creating the Second Activity Class54.4 Designing the User Interface Layout for ActivityB54.5 Reviewing the Application Manifest File54.6 Creating the Intent54.7 Extracting Intent Data54.8 Launching ActivityB as a Sub-Activity54.9 Returning Data from a Sub-Activity54.10 Testing the Application54.11 Summary
55. Android Implicit Intents – A Worked Example
55.1 Creating the Android Studio Implicit Intent Example Project55.2 Designing the User Interface55.3 Creating the Implicit Intent55.4 Adding a Second Matching Activity55.5 Adding the Web View to the UI55.6 Obtaining the Intent URL55.7 Modifying the MyWebView Project Manifest File55.8 Installing the MyWebView Package on a Device55.9 Testing the Application55.10 Summary
56. Android Broadcast Intents and Broadcast Receivers
56.1 An Overview of Broadcast Intents56.2 An Overview of Broadcast Receivers56.3 Obtaining Results from a Broadcast56.4 Sticky Broadcast Intents56.5 The Broadcast Intent Example56.6 Creating the Example Application56.7 Creating and Sending the Broadcast Intent56.8 Creating the Broadcast Receiver56.9 Registering the Broadcast Receiver56.10 Testing the Broadcast Example56.11 Listening for System Broadcasts56.12 Summary
57. A Basic Overview of Threads and AsyncTasks
57.1 An Overview of Threads57.2 The Application Main Thread57.3 Thread Handlers57.4 A Basic AsyncTask Example57.5 Subclassing AsyncTask57.6 Testing the App57.7 Canceling a Task57.8 Summary
58. An Overview of Android Started and Bound Services
58.1 Started Services58.2 Intent Service58.3 Bound Service58.4 The Anatomy of a Service58.5 Controlling Destroyed Service Restart Options58.6 Declaring a Service in the Manifest File58.7 Starting a Service Running on System Startup58.8 Summary
59. Implementing an Android Started Service – A Worked Example
59.1 Creating the Example Project59.2 Creating the Service Class59.3 Adding the Service to the Manifest File59.4 Starting the Service59.5 Testing the IntentService Example59.6 Using the Service Class59.7 Creating the New Service59.8 Modifying the User Interface59.9 Running the Application59.10 Creating an AsyncTask for Service Tasks59.11 Summary
60. Android Local Bound Services – A Worked Example
60.1 Understanding Bound Services60.2 Bound Service Interaction Options60.3 An Android Studio Local Bound Service Example60.4 Adding a Bound Service to the Project60.5 Implementing the Binder60.6 Binding the Client to the Service60.7 Completing the Example60.8 Testing the Application60.9 Summary
61. Android Remote Bound Services – A Worked Example
61.1 Client to Remote Service Communication61.2 Creating the Example Application61.3 Designing the User Interface61.4 Implementing the Remote Bound Service61.5 Configuring a Remote Service in the Manifest File61.6 Launching and Binding to the Remote Service61.7 Sending a Message to the Remote Service61.8 Summary
62. An Android Notifications Tutorial
62.1 An Overview of Notifications62.2 Creating the NotifyDemo Project62.3 Designing the User Interface62.4 Creating the Second Activity62.5 Creating a Notification Channel62.6 Creating and Issuing a Basic Notification62.7 Launching an Activity from a Notification62.8 Adding Actions to a Notification62.9 Bundled Notifications62.10 Summary
63. An Android Direct Reply Notification Tutorial
63.1 Creating the DirectReply Project63.2 Designing the User Interface63.3 Creating the Notification Channel63.4 Building the RemoteInput Object63.5 Creating the PendingIntent63.6 Creating the Reply Action63.7 Receiving Direct Reply Input63.8 Updating the Notification63.9 Summary
64. Foldable Devices and Multi-Window Support
64.1 Foldables and Multi-Window Support64.2 Using a Foldable Emulator64.3 Entering Multi-Window Mode64.4 Enabling and using Freeform Support64.5 Checking for Freeform Support64.6 Enabling Multi-Window Support in an App64.7 Specifying Multi-Window Attributes64.8 Detecting Multi-Window Mode in an Activity64.9 Receiving Multi-Window Notifications64.10 Launching an Activity in Multi-Window Mode64.11 Configuring Freeform Activity Size and Position64.12 Summary
65. An Overview of Android SQLite Databases
65.1 Understanding Database Tables65.2 Introducing Database Schema 65.3 Columns and Data Types 65.4 Database Rows 65.5 Introducing Primary Keys 65.6 What is SQLite?65.7 Structured Query Language (SQL)65.8 Trying SQLite on an Android Virtual Device (AVD)65.9 The Android Room Persistence Library65.10 Summary
66. The Android Room Persistence Library
66.1 Revisiting Modern App Architecture66.2 Key Elements of Room Database Persistence66.2.1 Repository66.2.2 Room Database66.2.3 Data Access Object (DAO)66.2.4 Entities66.2.5 SQLite Database66.3 Understanding Entities66.4 Data Access Objects66.5 The Room Database66.6 The Repository66.7 In-Memory Databases66.8 Summary
67. An Android TableLayout and TableRow Tutorial
67.1 The TableLayout and TableRow Layout Views67.2 Creating the Room Database Project67.3 Converting to a LinearLayout67.4 Adding the TableLayout to the User Interface67.5 Configuring the TableRows67.6 Adding the Button Bar to the Layout67.7 Adding the RecyclerView67.8 Adjusting the Layout Margins67.9 Summary
68. An Android Room Database and Repository Tutorial
68.1 About the RoomDemo Project68.2 Modifying the Build Configuration68.3 Building the Entity68.4 Creating the Data Access Object68.5 Adding the Room Database68.6 Adding the Repository68.7 Modifying the ViewModel68.8 Creating the Product Item Layout68.9 Adding the RecyclerView Adapter68.10 Preparing the Main Fragment68.11 Adding the Button Listeners68.12 Adding LiveData Observers68.13 Initializing the RecyclerView68.14 Testing the RoomDemo App68.15 Summary
69. Accessing Cloud Storage using the Android Storage Access Framework
69.1 The Storage Access Framework69.2 Working with the Storage Access Framework69.3 Filtering Picker File Listings69.4 Handling Intent Results69.5 Reading the Content of a File69.6 Writing Content to a File69.7 Deleting a File69.8 Gaining Persistent Access to a File69.9 Summary
70. An Android Storage Access Framework Example
70.1 About the Storage Access Framework Example70.2 Creating the Storage Access Framework Example70.3 Designing the User Interface70.4 Declaring Request Codes70.5 Creating a New Storage File70.6 The onActivityResult() Method70.7 Saving to a Storage File70.8 Opening and Reading a Storage File70.9 Testing the Storage Access Application70.10 Summary
71. Video Playback on Android using the VideoView and MediaController Classes
71.1 Introducing the Android VideoView Class71.2 Introducing the Android MediaController Class71.3 Creating the Video Playback Example71.4 Designing the VideoPlayer Layout71.5 Downloading the Video File71.6 Configuring the VideoView71.7 Adding the MediaController to the Video View71.8 Setting up the onPreparedListener71.9 Summary
72. Android Picture-in-Picture Mode
72.1 Picture-in-Picture Features72.2 Enabling Picture-in-Picture Mode72.3 Configuring Picture-in-Picture Parameters72.4 Entering Picture-in-Picture Mode72.5 Detecting Picture-in-Picture Mode Changes72.6 Adding Picture-in-Picture Actions72.7 Summary
73. An Android Picture-in-Picture Tutorial
73.1 Adding Picture-in-Picture Support to the Manifest73.2 Adding a Picture-in-Picture Button73.3 Entering Picture-in-Picture Mode73.4 Detecting Picture-in-Picture Mode Changes73.5 Adding a Broadcast Receiver73.6 Adding the PiP Action73.7 Testing the Picture-in-Picture Action73.8 Summary
74. Making Runtime Permission Requests in Android
74.1 Understanding Normal and Dangerous Permissions74.2 Creating the Permissions Example Project74.3 Checking for a Permission74.4 Requesting Permission at Runtime74.5 Providing a Rationale for the Permission Request74.6 Testing the Permissions App74.7 Summary
75. Android Audio Recording and Playback using MediaPlayer and MediaRecorder
75.1 Playing Audio75.2 Recording Audio and Video using the MediaRecorder Class75.3 About the Example Project75.4 Creating the AudioApp Project75.5 Designing the User Interface75.6 Checking for Microphone Availability75.7 Performing the Activity Initialization75.8 Implementing the recordAudio() Method75.9 Implementing the stopAudio() Method75.10 Implementing the playAudio() method75.11 Configuring and Requesting Permissions75.12 Testing the Application75.13 Summary
76. Working with the Google Maps Android API in Android Studio
76.1 The Elements of the Google Maps Android API76.2 Creating the Google Maps Project76.3 Obtaining Your Developer Signature76.4 Adding the Apache HTTP Legacy Library Requirement76.5 Testing the Application76.6 Understanding Geocoding and Reverse Geocoding76.7 Adding a Map to an Application76.8 Requesting Current Location Permission76.9 Displaying the User’s Current Location76.10 Changing the Map Type76.11 Displaying Map Controls to the User76.12 Handling Map Gesture Interaction76.12.1 Map Zooming Gestures76.12.2 Map Scrolling/Panning Gestures76.12.3 Map Tilt Gestures76.12.4 Map Rotation Gestures76.13 Creating Map Markers76.14 Controlling the Map Camera76.15 Summary
77. Printing with the Android Printing Framework
77.1 The Android Printing Architecture77.2 The Print Service Plugins77.3 Google Cloud Print77.4 Printing to Google Drive77.5 Save as PDF77.6 Printing from Android Devices77.7 Options for Building Print Support into Android Apps77.7.1 Image Printing77.7.2 Creating and Printing HTML Content77.7.3 Printing a Web Page77.7.4 Printing a Custom Document77.8 Summary
78. An Android HTML and Web Content Printing Example
78.1 Creating the HTML Printing Example Application78.2 Printing Dynamic HTML Content78.3 Creating the Web Page Printing Example78.4 Removing the Floating Action Button78.5 Removing Navigation Features78.6 Designing the User Interface Layout78.7 Loading the Web Page into the WebView78.8 Adding the Print Menu Option78.9 Summary
79. A Guide to Android Custom Document Printing
79.1 An Overview of Android Custom Document Printing79.1.1 Custom Print Adapters79.2 Preparing the Custom Document Printing Project79.3 Creating the Custom Print Adapter79.4 Implementing the onLayout() Callback Method79.5 Implementing the onWrite() Callback Method79.6 Checking a Page is in Range79.7 Drawing the Content on the Page Canvas79.8 Starting the Print Job79.9 Testing the Application79.10 Summary
80. An Introduction to Android App Links
80.1 An Overview of Android App Links80.2 App Link Intent Filters80.3 Handling App Link Intents80.4 Associating the App with a Website80.5 Summary
81. An Android Studio App Links Tutorial
81.1 About the Example App81.2 The Database Schema81.3 Loading and Running the Project81.4 Adding the URL Mapping81.5 Adding the Intent Filter81.6 Adding Intent Handling Code81.7 Testing the App Link81.8 Associating an App Link with a Web Site81.9 Summary
82. A Guide to the Android Studio Profiler
82.1 Accessing the Android Profiler82.2 Enabling Advanced Profiling82.3 The Android Profiler Tool Window82.4 The Sessions Panel82.5 The CPU Profiler82.6 Memory Profiler82.7 Network Profiler82.8 Energy Profiler82.9 Summary
83. An Android Biometric Authentication Tutorial
83.1 An Overview of Biometric Authentication83.2 Creating the Biometric Authentication Project83.3 Configuring Device Fingerprint Authentication83.4 Adding the Biometric Permission to the Manifest File83.5 Designing the User Interface83.6 Adding a Toast Convenience Method83.7 Checking the Security Settings83.8 Configuring the Authentication Callbacks83.9 Adding the CancellationSignal83.10 Starting the Biometric Prompt83.11 Testing the Project83.12 Summary
84. Creating, Testing and Uploading an Android App Bundle
84.1 The Release Preparation Process84.2 Android App Bundles84.3 Register for a Google Play Developer Console Account84.4 Configuring the App in the Console84.5 Enabling Google Play App Signing84.6 Creating a Keystore File84.7 Creating the Android App Bundle84.8 Generating Test APK Files84.9 Uploading the App Bundle to the Google Play Developer Console84.10 Exploring the App Bundle84.11 Managing Testers84.12 Uploading New App Bundle Revisions84.13 Analyzing the App Bundle File84.14 Enabling Google Play Signing for an Existing App84.15 Summary
85. An Overview of Android Dynamic Feature Modules
85.1 An Overview of Dynamic Feature Modules85.2 Dynamic Feature Module Architecture85.3 Creating a Dynamic Feature Module85.4 Converting an Existing Module for Dynamic Delivery85.5 Working with Dynamic Feature Modules85.6 Handling Large Dynamic Feature Modules85.7 Summary
86. An Android Studio Dynamic Feature Tutorial
86.1 Creating the DynamicFeature Project86.2 Adding Dynamic Feature Support to the Project86.3 Designing the Base Activity User Interface86.4 Adding the Dynamic Feature Module86.5 Reviewing the Dynamic Feature Module86.6 Adding the Dynamic Feature Activity86.7 Implementing the launchIntent() Method86.8 Uploading the App Bundle for Testing86.9 Implementing the installFeature() Method86.10 Adding the Update Listener86.11 Handling Large Downloads86.12 Using Deferred Installation86.13 Removing a Dynamic Module86.14 Summary
87. An Overview of Gradle in Android Studio
87.1 An Overview of Gradle87.2 Gradle and Android Studio87.2.1 Sensible Defaults87.2.2 Dependencies87.2.3 Build Variants87.2.4 Manifest Entries87.2.5 APK Signing87.2.6 ProGuard Support87.3 The Top-level Gradle Build File87.4 Module Level Gradle Build Files87.5 Configuring Signing Settings in the Build File87.6 Running Gradle Tasks from the Command-line87.7 Summary
Index

Content preview from Android Studio 4.0 Development Essentials - Java Edition

15. Saving and Restoring the State of an Android Activity

If the previous few chapters have achieved their objective, it should now be a little clearer as to the importance of saving and restoring the state of a user interface at particular points in the lifetime of an activity.

In this chapter, we will extend the example application created in “Android Activity State Changes by Example” to demonstrate the steps involved in saving and restoring state when an activity is destroyed and recreated by the runtime system.

A key component of saving and restoring dynamic state involves the use of the Android SDK Bundle class, a topic that will also be covered in this chapter.

15.1 Saving Dynamic State

An activity, as we have already learned, is given ...

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.

Read now

Unlock full access

More than 5,000 organizations count on O’Reilly

O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.

Julian F.

Head of Cybersecurity

I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.

Addison B.

Field Engineer

I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.

Amir M.

Data Platform Tech Lead

I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.

Mark W.

Embedded Software Engineer

Android Studio 4.1 Development Essentials – Java Edition

Publisher Resources

ISBN: 9781800562660

Cloud Computing

Data Engineering

Data Science

AI & ML

Programming Languages

Software Architecture

IT/Ops

Security

Design

Business

Soft Skills

Android Studio 4.0 Development Essentials - Java Edition

by Neil Smyth

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.