Book Image

Android Studio 4.1 Development Essentials – Java Edition

By : Neil Smyth
Book Image

Android Studio 4.1 Development Essentials – Java Edition

By: Neil Smyth

Overview of this book

For developers, Android 11 has a ton of new capabilities. The goal of this book is to teach the skills necessary to develop Android-based applications using the Java programming language. This book begins with the steps necessary to set up an Android development and testing environment. An overview of Android Studio along with the architecture of Android is covered next, followed by an in-depth look at the design of Android applications and user interfaces using the Android Studio environment. You will also learn about the Android architecture components along with some advanced topics such as touch screen handling, gesture recognition, the recording and playback of audio, app links, dynamic delivery, the AndroidStudio profiler, Gradle build configuration, and submitting apps to the Google Play Developer Console. The concepts of material design, including the use of floating action buttons, Snackbars, tabbed interfaces, card views, navigation drawers, and collapsing toolbars are a highlight of this book. This edition of the book also covers printing, transitions, and cloud-based file storage; the foldable device support is the cherry on the cake. By the end of this course, you will be able to develop Android 11 Apps using Android Studio 4.1, Java, and Android Jetpack. The code files for the book can be found here: https://www.ebookfrenzy.com/retail/androidstudio41/index.php
Table of Contents (88 chapters)
88
Index

38.4 Lifecycle States and Events

When the status of a lifecycle owner changes, the assigned Lifecycle object will be updated with the new state. At any given time, a lifecycle owner will be in one of the following five states:

Lifecycle.State.INITIALIZED

Lifecycle.State.CREATED

Lifecycle.State.STARTED

Lifecycle.State.RESUMED

Lifecycle.State.DESTROYED

As the component transitions through the different states, the Lifecycle object will trigger events on any observers that have been added to the list. The following events are available for implementation within the lifecycle observer:

Lifecycle.Event.ON_CREATE

Lifecycle.Event.ON_START

Lifecycle.Event.ON_RESUME

Lifecycle.Event.ON_PAUSE

Lifecycle.Event.ON_STOP

Lifecycle.Event.ON_DESTROY

Lifecycle.Event.ON_ANY

Annotations are used within the observer class to associate methods with lifecycle events. The...