How can I pass a compiler flag like -Dkotlinx.coroutines.debug when running an app in Android Studio...

# coroutines

[petersommerhoff]

How can I pass a compiler flag like -Dkotlinx.coroutines.debug when running an app in Android Studio?

[christophsturm]

in idea you can select “edit configuration” in the run configurations selector in the toolbar next to the play button. or in the Run pull down menu there is also a Edit Configuration option

[petersommerhoff]

i know but there's no such option in Android Studio unfortunately...

[christophsturm]

I just opened Android Studio 3.0.1 and it has both options

[petersommerhoff]

Should have been more precise, I mean there's no "JVM flags" option for an "Android App" config

[christophsturm]

ah ok. that’s probably because its not using the jvm

[petersommerhoff]

Yep, question is if there's any way to pass the -Dkotlinx.coroutines.debug flag (or any other)

[pakoito]

https://developer.android.com/studio/command-line/adb.html#am

[pakoito]

that’s what you’re after

[pakoito]

You can declare extra data in your Intent and pick it up in your launch Activity

[pakoito]

or any activity really

[pakoito]

if you see, there are intent arguments specced here: https://developer.android.com/studio/command-line/adb.html#IntentSpec

[petersommerhoff]

Hmm not sure how to solve it with this, I don't really want to process an extra in the MainActivity, the idea is that Kotlin automatically adds coroutine ids to thread names as described here: https://github.com/Kotlin/kotlinx.coroutines/blob/master/coroutines-guide.md#debugging-coroutines-and-threads

[Dmytro Danylyk]

@petersommerhoff if you want to enable debug on android, create Application class

[Dmytro Danylyk]

And inside onCreate add this: System.setProperty("kotlinx.coroutines.debug", if (BuildConfig.DEBUG) "on" else "off")

[Dmytro Danylyk]

In next release, there will be public constants, to get rid of magic strings on, `off`…

[Dmytro Danylyk]

If you want to know full story: https://github.com/Kotlin/kotlinx.coroutines/issues/316

[petersommerhoff]

Thanks, I'll try that!

[petersommerhoff]

That works @Dmytro Danylyk, thanks so much, also thanks to Christoph and Paco for helping!

[petersommerhoff]

Quick follow-up: does anyone know what the difference is between -ea flag and -Dkotlinx.coroutines.debug?

[petersommerhoff]

Oh, that's "enable assertions", works for coroutines in IntelliJ as well