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You're reading from Android Studio 4.2 Development Essentials - Java Edition Developing Android applications using Android Studio 4.2, Java, and Android Jetpack

Product type Paperback

Published in Aug 2021

Publisher Packt

ISBN-13 9781803238814

Length 782 pages

Edition 1st Edition

Languages

Java

Tools

Android

Concepts

Android Development

Author (1):

Neil Smyth

View More author details

Table of Contents (87) Chapters

1. Introduction

2. Setting up an Android Studio Development Environment FREE CHAPTER

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. An Overview of Android View Binding

12. Understanding Android Application and Activity Lifecycles

13. Handling Android Activity State Changes

14. Android Activity State Changes by Example

15. Saving and Restoring the State of an Android Activity

16. Understanding Android Views, View Groups and Layouts

17. A Guide to the Android Studio Layout Editor Tool

18. A Guide to the Android ConstraintLayout

19. A Guide to Using ConstraintLayout in Android Studio

20. Working with ConstraintLayout Chains and Ratios in Android Studio

21. An Android Studio Layout Editor ConstraintLayout Tutorial

22. Manual XML Layout Design in Android Studio

23. Managing Constraints using Constraint Sets

24. An Android ConstraintSet Tutorial

25. A Guide to using Apply Changes in Android Studio

26. An Overview and Example of Android Event Handling

27. Android Touch and Multi-touch Event Handling

28. Detecting Common Gestures Using the Android Gesture Detector Class

29. Implementing Custom Gesture and Pinch Recognition on Android

30. An Introduction to Android Fragments

31. Using Fragments in Android Studio - An Example

32. Modern Android App Architecture with Jetpack

33. An Android Jetpack ViewModel Tutorial

34. An Android Jetpack LiveData Tutorial

35. An Overview of Android Jetpack Data Binding

36. An Android Jetpack Data Binding Tutorial

37. An Android ViewModel Saved State Tutorial

38. Working with Android Lifecycle-Aware Components

39. An Android Jetpack Lifecycle Awareness Tutorial

40. An Overview of the Navigation Architecture Component

41. An Android Jetpack Navigation Component Tutorial

42. An Introduction to MotionLayout

43. An Android MotionLayout Editor Tutorial

44. A MotionLayout KeyCycle Tutorial

45. Working with the Floating Action Button and Snackbar

46. Creating a Tabbed Interface using the TabLayout Component

47. Working with the RecyclerView and CardView Widgets

48. An Android RecyclerView and CardView Tutorial

49. A Layout Editor Sample Data Tutorial

50. Working with the AppBar and Collapsing Toolbar Layouts

51. An Android Studio Primary/Detail Flow Tutorial

52. An Overview of Android Intents

53. Android Explicit Intents – A Worked Example

54. Android Implicit Intents – A Worked Example

55. Android Broadcast Intents and Broadcast Receivers

56. A Basic Overview of Java Threads, Handlers and Executors

57. An Overview of Android Services

58. Implementing an Android Started Service – A Worked Example

59. Android Local Bound Services – A Worked Example

60. Android Remote Bound Services – A Worked Example

61. An Android Notifications Tutorial

62. An Android Direct Reply Notification Tutorial

63. Foldable Devices and Multi-Window Support

64. An Overview of Android SQLite Databases

65. The Android Room Persistence Library

66. An Android TableLayout and TableRow Tutorial

67. An Android Room Database and Repository Tutorial

68. Accessing Cloud Storage using the Android Storage Access Framework

69. An Android Storage Access Framework Example

70. Video Playback on Android using the VideoView and MediaController Classes

71. Android Picture-in-Picture Mode

72. An Android Picture-in-Picture Tutorial

73. Making Runtime Permission Requests in Android

74. Android Audio Recording and Playback using MediaPlayer and MediaRecorder

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

76. Printing with the Android Printing Framework

77. An Android HTML and Web Content Printing Example

78. A Guide to Android Custom Document Printing

79. An Introduction to Android App Links

80. An Android Studio App Links Tutorial

81. A Guide to the Android Studio Profiler

82. An Android Biometric Authentication Tutorial

83. Creating, Testing and Uploading an Android App Bundle

84. An Overview of Android Dynamic Feature Modules

85. An Android Studio Dynamic Feature Tutorial

86. An Overview of Gradle in Android Studio

Index

20.7 Working with Ratios

ConstraintLayout ratios allow one dimension of a widget to be sized relative to the widget’s other dimension (otherwise known as aspect ratio). An aspect ratio setting could, for example, be applied to an ImageView to ensure that its width is always twice its height.

A dimension ratio constraint is configured by setting the constrained dimension to match constraint mode and configuring the layout_constraintDimensionRatio attribute on that widget to the required ratio. This ratio value may be specified either as a float value or a width:height ratio setting. The following XML excerpt, for example, configures a ratio of 2:1 on an ImageView widget:

<ImageView

android:layout_width="0dp"

android:layout_height="100dp"

android:id="@+id/imageView"

...