Why use HandlerThread in Android

Question

In android , Handler can be used to post / handle message, if I don\'t use a HandlerThread (pass its Looper to Handler), does that mean in this case Handler use MainThread (

Answer 1

HandlerThread is useful when you want to execute a lot of background tasks, since it has its own looper. Normally if you post a message to a Handler it uses the MainThread's looper. This means that that the task is executed on the UI Thread. But in the case of HandlerThread, these tasks are executed on the worker thread. You can find a more detailed explanation here