Storing data using the Android SDK
Last updated on 2016-10-02
About the Book
You have a good start on building your Android application, but now comes the time to store the data entered by your users on their device. It's an important part of any application; even a quick prototype needs a way to store data. What is the best way to do it?
Here is a quick guide to get you started with the tools available in the Android SDK, without having to learn yet another new framework or library. You'll learn how to :
- Save simple data to flat files in the internal and external storage of the device,
- Save user preferences using the Preferences API,
- Save structured data in an SQLite database,
- Save images so you can refer to them in a SQLite database,
- Persist the state of an activity so users don't lose their input just because they rotated their device or took a phone call.
This guide also includes examples to help you implement all of those in your own Android applications. Purchase now and you can be up and running in a few minutes!
About the Author
Table of Contents
- Introduction
-
Chapter 1 : Saving data to a file
- Internal storage
- External storage
- Example code to save to a file
- Chapter 2 : Saving preferences
-
Chapter 3 : Saving to a SQLite database
- Inserting a new row
- Reading existing rows
- Updating existing rows
- Deleting existing rows
- Chapter 4 : Saving an image in a SQLite database
-
Chapter 5 : Storing the state of an activity
- Saving the current UI state
- Saving your data to a permanent data store
- Conclusion
Authors have earned$8,170,936writing, publishing and selling on Leanpub,
earning 80% royalties while saving up to 25 million pounds of CO2 and up to 46,000 trees.
Learn more about writing on Leanpub
The Leanpub 45-day 100% Happiness Guarantee
Within 45 days of purchase you can get a 100% refund on any Leanpub purchase, in two clicks.
See full terms
Free Updates. Free App. DRM Free.
If you buy a Leanpub book, you get free updates for as long as the author updates the book! Many authors use Leanpub to publish their books in-progress, while they are writing them. All readers get free updates, regardless of when they bought the book or how much they paid (including free).
Most Leanpub books are available in PDF (for computers), EPUB (for phones and tablets), MOBI (for Kindle) and in the free Leanpub App (for Mac, Windows, iOS and Android). The formats that a book includes are shown at the top right corner of this page.
Finally, Leanpub books don't have any DRM copy-protection nonsense, so you can easily read them on any supported device.
Learn more about Leanpub's ebook formats and where to read them
