Android : Background Processing

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A talk on how to do stuff in Background in Android, for IIT Kharagpur students. Code used, can be found here on github: https://github.com/Sheikh-Aman/Teach/tree/master/BackgroundDemo

Technology

Android : Doing things in Background
Who am I ?
Aman Alam
Co-Founder,
Happily Coded Mobile Solutions,
Assistant Organizer, BlrDroid
Bangalore, IN
Happilycoded.com
@amanalam

What

Offloading UI Thread, doing heavy work in background thread

2

Why
- Network on Main Thread is not allowed
- Slow UI thread makes the ANR error show up
- Nobody likes slow apps
- A bit about UI Thread

3

Solutions
- Java Threads
- Handlers
- AsyncTask
- Service
- IntentService
- Getting Results back
4

What to use, and when
- Java Threads : Avoid
- Handlers : very small tasks
- AsyncTask : Simple tasks related to current activity
only
- Service : Somewhat heavy, independence needed
- IntentService : Easy handling of multiple requests
One shot to kill all doesn't work
5

Getting our hands dirty

Code Time!

- Getting results back
- Java Threads
- Handlers
- AsyncTask
- Service
- IntentService
6

Further Reading
- Bound Services :
http://developer.android.com/guide/components/bound-services.html

- Keeping the app responsive :
http://developer.android.com/training/articles/perf-anr.html

- Working with IntentServices :
http://developer.android.com/training/run-background-service/create-service.html

- Dealing with normal Thread :
http://stackoverflow.com/a/6463591/243709

7

Further Reading

- Background processing :
http://www.vogella.com/articles/AndroidBackgroundProcessing/article.html

- Code:
https://github.com/Sheikh-Aman/Teach/tree/master/BackgroundDemo

8

That's All Folks!
Thank You!
Aman Alam

Contact:

Co-Founder,

aman@blrdroid.org

Happily Coded Mobile Solutions,

@amanalam

Bangalore, IN

gplus.to/SheikhAman

Happilycoded.com

www.sheikhaman.com

@amanalam

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Android : Background Processing

1. Android : Doing things in Background Who am I ? Aman Alam Co-Founder, Happily Coded Mobile Solutions, Assistant Organizer, BlrDroid Bangalore, IN Happilycoded.com @amanalam

2. What Offloading UI Thread, doing heavy work in background thread 2

3. Why - Network on Main Thread is not allowed - Slow UI thread makes the ANR error show up - Nobody likes slow apps - A bit about UI Thread 3

4. Solutions - Java Threads - Handlers - AsyncTask - Service - IntentService - Getting Results back 4

5. What to use, and when - Java Threads : Avoid - Handlers : very small tasks - AsyncTask : Simple tasks related to current activity only - Service : Somewhat heavy, independence needed - IntentService : Easy handling of multiple requests One shot to kill all doesn't work 5

6. Getting our hands dirty Code Time! - Getting results back - Java Threads - Handlers - AsyncTask - Service - IntentService 6

7. Further Reading - Bound Services : http://developer.android.com/guide/components/bound-services.html - Keeping the app responsive : http://developer.android.com/training/articles/perf-anr.html - Working with IntentServices : http://developer.android.com/training/run-background-service/create-service.html - Dealing with normal Thread : http://stackoverflow.com/a/6463591/243709 7

8. Further Reading - Background processing : http://www.vogella.com/articles/AndroidBackgroundProcessing/article.html - Code: https://github.com/Sheikh-Aman/Teach/tree/master/BackgroundDemo 8

9. That's All Folks! Thank You! Aman Alam Contact: Co-Founder, aman@blrdroid.org Happily Coded Mobile Solutions, @amanalam Bangalore, IN gplus.to/SheikhAman Happilycoded.com www.sheikhaman.com @amanalam

Android : Background Processing

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