hey guys, I know it sounds stupid but why don’t I get ANR? I am blocking the main thread for 10 sec...

# android

[Ofir Bar]

hey guys,

I know it sounds stupid but why don’t I get ANR?
I am blocking the main thread for 10 seconds.
I also tried Thread.sleep(10000)

[Himanshu Sharma]

ANR usually occurs when the app doesn’t respond to User interaction for more than n seconds. here you are blocking the main thread but probably not trying to intact with the app button click, view tap, scroll, swipe etc

[Ofir Bar]

I tried what you suggested with the following code, but it still doesn’t crash:

[Anastasia Finogenova]

Try actual interactions aka click on the screen

[Pablichjenkov]

delay() does not block the thread. It pretty much schedule a Job to be executed at the specified time.

[Pablichjenkov]

It suspend the coroutine, whatever code block inside the runBlocking lambda, but it does not touch the underlaying thread.

[Romain Saury]

But runBlocking should block the thread no ? 🤔

[Kris Wong]

run blocking uses an event loop based dispatcher

[Kris Wong]

i would still expect Thread.sleep to block the main thread, however

[Romain Saury]

The dispatcher used for the coroutine block shouldn’t change that runBlocking is supposed to block the thread until the block completion. Or am I missing something ?

[Kris Wong]

it does block. an event loop also blocks the main thread. runBlocking blocks in the same way. it continues to process events on the event loop until the work is completed.