midAndroid
What is Android Handler and Looper?
Updated Apr 28, 2026
Short answer
Handler and Looper manage message queues for threads.
Deep explanation
Looper runs a message loop, and Handler posts tasks to it. It is used for thread communication.
Real-world example
Updating UI from background thread.
Common mistakes
- Memory leaks due to handlers.
Follow-up questions
- What is Looper?
- Why Handler?