Error trying to use Fragment

I am new to Android.  I have been working thru some examples in a book called  Head First Android Development.  I entered a small program using fragments and get a Casting Error.

cannot cast andoid.app.fragment to com.hilights.rsobol.workout.WorkoutDetailFragment

I am hoping someone can download the attached zip file and show me the error of my ways. It is most likely a simple error that someone with some experience can see.

Thank you in advance for your help,

Rob

rsobol@hilightsinc.com

Views: 195

Attachments:

▶ Reply to This

Happy 10th year, JCertif!

Notes

Welcome to Codetown!

Codetown is a social network. It's got blogs, forums, groups, personal pages and more! You might think of Codetown as a funky camper van with lots of compartments for your stuff and a great multimedia system, too! Best of all, Codetown has room for all of your friends.

When you create a profile for yourself you get a personal page automatically. That's where you can be creative and do your own thing. People who want to get to know you will click on your name or picture and…
Continue

Created by Michael Levin Dec 18, 2008 at 6:56pm. Last updated by Michael Levin May 4, 2018.

Looking for Jobs or Staff?

Check out the Codetown Jobs group.

 

Enjoy the site? Support Codetown with your donation.



InfoQ Reading List

jQuery Releases v4: First Major Version in Almost 10 Years

jQuery 4 has launched, celebrating 20 years of innovation in web development. This major update modernizes the library by removing legacy code and outdated browser support while ensuring simplicity and performance. With enhanced compatibility for modern build tools and new security features, jQuery 4 remains a practical choice for developers, bolstering productivity while maintaining its legacy.

By Daniel Curtis

OpenTelemetry Project Publishes “Demystifying OpenTelemetry” Guide to Broaden Observability Adoption

The OpenTelemetry open-source observability project recently published a comprehensive guide titled "Demystifying OpenTelemetry" aimed at helping organizations understand, adopt, and scale observability using the OpenTelemetry standard.

By Craig Risi

Presentation: How WebAssembly Components Enable Safe and Portable Software Extensions

Alex Radovici explains the shift from C-ABI and scripting to the Wasm Component Model (WASI Preview 2). He shares how to build secure plugin systems that run at near-native speed across Rust, TypeScript, and C++. Architects will learn about Wasm Interface Types (WIT), resource management, and the practical lessons learned from deploying sandboxed extensions in safety-critical environments.

By Alex Radovici

JDK 26 and JDK 27: What We Know So Far

JDK 26, the first non-LTS release since JDK 25, has reached its second release candidate with a final set of 10 new features, in the form of JEPs, that can be separated into five categories: Core Java Library, HotSpot, Java Language Specification, Security Library and Client Library. We examine JDK 26 and predict what features have, or could be, targeted for JDK 27.

By Michael Redlich

Reducing Onboarding from 48 Hours to 4: inside Amazon Key’s Event-Driven Platform

Amazon Key modernized its event platform by adopting a centralized, event-driven architecture built on Amazon EventBridge. The redesign processes millions of daily events with millisecond latency, improves schema governance, automates cross-account routing, and reduces service onboarding time from 48 hours to four, while maintaining 99.99 percent reliability.

By Leela Kumili

© 2026   Created by Michael Levin.   Powered by

Badges  |  Report an Issue  |  Terms of Service