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You're reading from  Android Studio 4.1 Development Essentials – Java Edition

Product typeBook
Published inMay 2021
PublisherPackt
ISBN-139781801815161
Edition1st Edition
Tools
Android Studio
Concepts
Android Development
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Author (1)
Neil Smyth
Neil Smyth
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Neil Smyth

Neil Smyth has over 25 years of experience in the IT industry, including roles in software development and enterprise-level UNIX and Linux system administration. In addition to a bachelor’s degree in information technology, he also holds A+, Security+, Network+, Project+, and Microsoft Certified Professional certifications and is a CIW Database Design Specialist. Neil is the co-founder and CEO of Payload Media, Inc. (a technical content publishing company), and the author of the Essentials range of programming and system administration books.
Read more about Neil Smyth

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39.4 Testing the Observer

Since the DemoObserver class outputs diagnostic information to the Logcat console, it will be easier to see the output if a filter is configured to display only the DemoObserver messages. Using the steps outlined previously in “Android Activity State Changes by Example”, configure a filter for messages associated with the DemoObserver tag before running the app on a device or emulator.

On successful launch of the app, the Logcat output should indicate the following lifecycle state changes and events:

onCreate

CREATED

onStart

STARTED

onResume

RESUMED

With the app still running, perform a device rotation to trigger the destruction and recreation of the fragment, generating the following additional output:

onPause

STARTED

onStop

CREATED

onDestroy

DESTROYED

onCreate

CREATED

onStart

STARTED

onResume

RESUMED

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Android Studio 4.1 Development Essentials – Java Edition
Published in: May 2021Publisher: PacktISBN-13: 9781801815161
© 2021 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Neil Smyth

Neil Smyth has over 25 years of experience in the IT industry, including roles in software development and enterprise-level UNIX and Linux system administration. In addition to a bachelor’s degree in information technology, he also holds A+, Security+, Network+, Project+, and Microsoft Certified Professional certifications and is a CIW Database Design Specialist. Neil is the co-founder and CEO of Payload Media, Inc. (a technical content publishing company), and the author of the Essentials range of programming and system administration books.
Read more about Neil Smyth

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