September 2018
Intermediate to advanced
928 pages
24h 36m
English
Content preview from Professional Android, 4th Edition
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8Files, Saving State, and User Preferences
SAVING FILES, STATES, AND PREFERENCES
This chapter introduces some of the simplest and most versatile data-persistence and file sharing techniques in Android: Shared Preferences, instance-state Bundles, local files, and the Storage Access Framework.
At a minimum, an Activity should save its user interface (UI) state before becoming inactive, to ensure the same UI is presented when the Activity restarts. It’s also likely that you’ll need to save user preferences and UI selections.
Android’s nondeterministic Activity and application lifetimes make persisting UI state and application data between sessions particularly important, because your application process may have been killed and restarted before it returns to the foreground.
We will explore mechanisms ...
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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.