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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ViewModel vs Saved Instance State
While saved instance state stores an activity record across process death, it also stores an activity record across a configuration change. When you first launch the activity, the saved instance state bundle is null. When you rotate the device, the OS calls onSaveInstanceState(Bundle) on your activity. The OS then passes the data you stashed in the bundle to onCreate(Bundle?).
If saved instance state protects from both configuration changes and process death, why bother with a ViewModel at all? To be fair, GeoQuiz is so simple that you could have gotten away with saved instance state only.
However, most apps do not rely on a small, hardcoded question bank data set like GeoQuiz does. Most apps ...
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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.