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Asynchronous Android Programming

You're reading from   Asynchronous Android Programming Unlock the power of multi-core mobile devices to build responsive and reactive Android applications

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Product type Paperback
Published in Jul 2016
Publisher Packt
ISBN-13 9781785883248
Length 394 pages
Edition 2nd Edition
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Authors (2):
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Helder Vasconcelos Helder Vasconcelos
Author Profile Icon Helder Vasconcelos
Helder Vasconcelos
Steve Liles Steve Liles
Author Profile Icon Steve Liles
Steve Liles
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Toc

Table of Contents (14) Chapters Close

Preface 1. Asynchronous Programming in Android FREE CHAPTER 2. Performing Work with Looper, Handler, and HandlerThread 3. Exploring the AsyncTask 4. Exploring the Loader 5. Interacting with Services 6. Scheduling Work with AlarmManager 7. Exploring the JobScheduler API 8. Interacting with the Network 9. Asynchronous Work on the Native Layer 10. Network Interactions with GCM 11. Exploring Bus-based Communications 12. Asynchronous Programing with RxJava Index

Building responsive apps with CursorLoader


CursorLoader is a specialized subclass of AsyncTaskLoader that uses its lifecycle methods to correctly manage the resources associated with a database Cursor.

A database Cursor is a little like an Iterator, in that it allows you to scroll through a dataset without having to worry where exactly the dataset is coming from or what data structure it is a part of.

We're going to use CursorLoader to query the Android device for a list of music albums available. Because CursorLoader is already implemented to correctly handle all of the details of working with a Cursor, we don't need to subclass it. We can simply instantiate it, passing in the information it needs in order to open the Cursor it should manage for us. We can do this in the onCreateLoader callback:

@Override
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
  String[] columns = new String[] {
    MediaStore.Audio.Albums._ID,
    MediaStore.Audio.Albums.ARTIST,
    MediaStore...
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