July 2015
Beginner to intermediate
600 pages
18h 59m
English
book
Android Programming: The Big Nerd Ranch Guide, 2nd Edition
by Bill Phillips, Chris Stewart, Brian Hardy, Kristin Marsicano
Content preview from Android Programming: The Big Nerd Ranch Guide, 2nd Edition
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Saving Data Across Rotation
Android does a great job of providing alternative resources at the right time. However, destroying and re-creating activities on rotation can cause headaches, too, like GeoQuiz’s bug of reverting back to the first question when the device is rotated.
To fix this bug, the post-rotation QuizActivity needs to know the old value of mCurrentIndex. You need a way to save this data across a runtime configuration change, like rotation. One way to do this is to override the Activity method:
protected void onSaveInstanceState(Bundle outState)
This method is normally called by the system before onPause(), onStop(), and onDestroy().
The default implementation of onSaveInstanceState(…) directs all of the activity’s ...
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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.