Android Main Thread and background processing Flashcards
Understand the Single Thread model in Android
1
Q
What thread is created when an application launches
A
Main thread known as the UI thread
2
Q
What are the two rules for Android’s single thread model?
A
- Don’t block the UI thread
- Do not access the UI thread from outside the UI thread (ie) from a worker thread
3
Q
Why would blocking of the UI thread occur?
A
Performing resource intensive tasks
4
Q
What are worker threads
A
All other threads apart from the UI thread
5
Q
Do objects outside of the thread have access to the objects on the thread
A
No
6
Q
What does ANR stand for and when can it happen?
A
Application Not Responding, this can happen when the UI thread is performing a long operation such as a DB query or network request, ML algorithm or downloading files
7
Q
How do you decide to run something on a worker thread
A
If it takes more than a few milliseconds to complete
8
Q
What is used for persistent background work?
A
Android WorkManager
