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You're reading from Android Studio 3.5 Development Essentials - Java Edition Developing Android 10 (Q) Apps Using Android Studio 3.5, Java, and Android Jetpack

Product type Paperback

Published in May 2019

Publisher Packt

ISBN-13 9781951442019

Length 778 pages

Edition 1st Edition

Languages

Java

Tools

Android

Concepts

Android Development

Author (1):

Neil Smyth

View More author details

Table of Contents (86) Chapters

1. Introduction FREE CHAPTER

2. Setting up an Android Studio Development Environment

3. Creating an Example Android App in Android Studio

4. Creating an Android Virtual Device (AVD) in Android Studio

5. Using and Configuring the Android Studio AVD Emulator

6. A Tour of the Android Studio User Interface

7. Testing Android Studio Apps on a Physical Android Device

8. The Basics of the Android Studio Code Editor

9. An Overview of the Android Architecture

10. The Anatomy of an Android Application

11. Understanding Android Application and Activity Lifecycles

12. Handling Android Activity State Changes

13. Android Activity State Changes by Example

14. Saving and Restoring the State of an Android Activity

15. Understanding Android Views, View Groups and Layouts

16. A Guide to the Android Studio Layout Editor Tool

17. A Guide to the Android ConstraintLayout

18. A Guide to using ConstraintLayout in Android Studio

19. Working with ConstraintLayout Chains and Ratios in Android Studio

20. An Android Studio Layout Editor ConstraintLayout Tutorial

21. Manual XML Layout Design in Android Studio

22. Managing Constraints using Constraint Sets

23. An Android ConstraintSet Tutorial

24. A Guide to using Apply Changes in Android Studio

25. An Overview and Example of Android Event Handling

26. Android Touch and Multi-touch Event Handling

27. Detecting Common Gestures using the Android Gesture Detector Class

28. Implementing Custom Gesture and Pinch Recognition on Android

29. An Introduction to Android Fragments

30. Using Fragments in Android Studio - An Example

31. Modern Android App Architecture with Jetpack

32. An Android Jetpack ViewModel Tutorial

33. An Android Jetpack LiveData Tutorial

34. An Overview of Android Jetpack Data Binding

35. An Android Jetpack Data Binding Tutorial

36. Working with Android Lifecycle-Aware Components

37. An Android Jetpack Lifecycle Awareness Tutorial

38. An Overview of the Navigation Architecture Component

39. An Android Jetpack Navigation Component Tutorial

40. Creating and Managing Overflow Menus on Android

41. Animating User Interfaces with the Android Transitions Framework

42. An Android Transition Tutorial using beginDelayedTransition

43. Implementing Android Scene Transitions – A Tutorial

44. Working with the Floating Action Button and Snackbar

45. Creating a Tabbed Interface using the TabLayout Component

46. Working with the RecyclerView and CardView Widgets

47. An Android RecyclerView and CardView Tutorial

48. A Layout Editor Sample Data Tutorial

49. Working with the AppBar and Collapsing Toolbar Layouts

50. An Android Studio Master/Detail Flow Tutorial

51. An Overview of Android Intents

52. Android Explicit Intents – A Worked Example

53. Android Implicit Intents – A Worked Example

54. Android Broadcast Intents and Broadcast Receivers

55. A Basic Overview of Threads and AsyncTasks

56. An Overview of Android Started and Bound Services

57. Implementing an Android Started Service – A Worked Example

58. Android Local Bound Services – A Worked Example

59. Android Remote Bound Services – A Worked Example

60. An Android Notifications Tutorial

61. An Android Direct Reply Notification Tutorial

62. Foldable Devices and Multi-Window Support

63. An Overview of Android SQLite Databases

64. The Android Room Persistence Library

65. An Android TableLayout and TableRow Tutorial

66. An Android Room Database and Repository Tutorial

67. Accessing Cloud Storage using the Android Storage Access Framework

68. An Android Storage Access Framework Example

69. Implementing Video Playback on Android using the VideoView and MediaController Classes

70. Android Picture-in-Picture Mode

71. An Android Picture-in-Picture Tutorial

72. Making Runtime Permission Requests in Android

73. Android Audio Recording and Playback using MediaPlayer and MediaRecorder

74. Working with the Google Maps Android API in Android Studio

75. Printing with the Android Printing Framework

76. An Android HTML and Web Content Printing Example

77. A Guide to Android Custom Document Printing

78. An Introduction to Android App Links

79. An Android Studio App Links Tutorial

80. A Guide to the Android Studio Profiler

81. An Android Biometric Authentication Tutorial

82. Creating, Testing and Uploading an Android App Bundle

83. An Overview of Android Dynamic Feature Modules

84. An Android Studio Dynamic Feature Tutorial

85. An Overview of Gradle in Android Studio

Index

14.4 Saving the State

The first step in extending the StateChange application is to make sure that the text entered by the user is extracted from the EditText component within the onSaveInstanceState() method of the MainActivity activity, and then saved as a key-value pair into the Bundle object.

In order to extract the text from the EditText object we first need to identify that object in the user interface. Clearly, this involves bridging the gap between the Java code for the activity (contained in the MainActivity.java source code file) and the XML representation of the user interface (contained within the content_main.xml resource file). In order to extract the text entered into the EditText component we need to gain access to that user interface object.

Each component within a user interface has associated with it a unique identifier. By default, the Layout Editor tool constructs the ID for a newly added component from the object type. If more than one view of the same...

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Table of Contents (86) Chapters

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Authors (1)