October 2019
Intermediate to advanced
624 pages
20h 7m
English
book
Android Programming: The Big Nerd Ranch Guide, 4th Edition
by Bill Phillips, Chris Stewart, Kristin Marsicano, Brian Gardner
Content preview from Android Programming: The Big Nerd Ranch Guide, 4th Edition
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For the More Curious: Singletons
The singleton pattern, as used in the CrimeRepository, is very common in Android. Singletons get a bad rap because they can be misused in a way that makes an app hard to maintain.
Singletons are often used in Android because they outlive a single fragment or activity. A singleton will still exist across rotation and will exist as you move between activities and fragments in your application.
Singletons also make a convenient owner of your model objects. Imagine a more complex CriminalIntent application with many activities and fragments modifying crimes. When one controller modifies a crime, how would you make sure that updated crime was sent over to the other controllers?
If the CrimeRepository ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.