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You're reading from Android Studio 4.1 Development Essentials – Java Edition Developing Android 11 Apps Using Android Studio 4.1, Java, and Android Jetpack

Product type Paperback

Published in May 2021

Publisher Packt

ISBN-13 9781801815161

Length 810 pages

Edition 1st Edition

Languages

Java

Tools

Android

Concepts

Android Development

Author (1):

Neil Smyth

View More author details

Table of Contents (88) 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. Creating and Managing Overflow Menus on Android

43. An Introduction to MotionLayout

44. An Android MotionLayout Editor Tutorial

45. A MotionLayout KeyCycle Tutorial

46. Working with the Floating Action Button and Snackbar

47. Creating a Tabbed Interface using the TabLayout Component

48. Working with the RecyclerView and CardView Widgets

49. An Android RecyclerView and CardView Tutorial

50. A Layout Editor Sample Data Tutorial

51. Working with the AppBar and Collapsing Toolbar Layouts

52. An Android Studio Master/Detail Flow Tutorial

53. An Overview of Android Intents

54. Android Explicit Intents – A Worked Example

55. Android Implicit Intents – A Worked Example

56. Android Broadcast Intents and Broadcast Receivers

57. A Basic Overview of Threads and AsyncTasks

58. An Overview of Android Started and Bound Services

59. Implementing an Android Started Service – A Worked Example

60. Android Local Bound Services – A Worked Example

61. Android Remote Bound Services – A Worked Example

62. An Android Notifications Tutorial

63. An Android Direct Reply Notification Tutorial

64. Foldable Devices and Multi-Window Support

65. An Overview of Android SQLite Databases

66. The Android Room Persistence Library

67. An Android TableLayout and TableRow Tutorial

68. An Android Room Database and Repository Tutorial

69. Accessing Cloud Storage using the Android Storage Access Framework

70. An Android Storage Access Framework Example

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

72. Android Picture-in-Picture Mode

73. An Android Picture-in-Picture Tutorial

74. Making Runtime Permission Requests in Android

75. Android Audio Recording and Playback using MediaPlayer and MediaRecorder

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

77. Printing with the Android Printing Framework

78. An Android HTML and Web Content Printing Example

79. A Guide to Android Custom Document Printing

80. An Introduction to Android App Links

81. An Android Studio App Links Tutorial

82. A Guide to the Android Studio Profiler

83. An Android Biometric Authentication Tutorial

84. Creating, Testing and Uploading an Android App Bundle

85. An Overview of Android Dynamic Feature Modules

86. An Android Studio Dynamic Feature Tutorial

87. An Overview of Gradle in Android Studio

Index

70.6 Saving to a Storage File

Now that the application is able to create new storage based files, the next step is to add the ability to save any text entered by the user to a file. The user interface is configured to call the saveFile() method when the Save button is selected by the user. This method will be responsible for starting a new intent of type ACTION_OPEN_DOCUMENT which will result in the picker user interface appearing so that the user can choose the file to which the text is to be stored. Since we are only working with plain text files, the intent needs to be configured to restrict the user’s selection options to existing files that match the text/plain MIME type. Having identified the actions to be performed by the saveFile() method, this can now be added to the MainActivity.java class file as follows:

public void saveFile(View view)

{

Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);

...