Debug Kotlins coroutines in Android

Question

Is it possible to debug a coroutine in Android? When I tried to debug this code snippet:

runBlocking {
        try {
            async(CommonPool) {
                showLoadingIndicator()
                val a = loadData().await()
                hideLoadingIndicator()
            }
        } catch (e: Exception) {
            Log.e("lala", "exception " + e.toString())
        }
}

val a has the following message: Cannot find local variable: name = a

In my App, I'm setting the property for coroutines debugging as followed:

System.setProperty("kotlinx.coroutines.debug", if (BuildConfig.DEBUG) "on" else "off")

Still not working. Now I have no idea how to use the debugger when working with coroutines. May you guys help me please?

Thanks in advance

Alban

Answer 1

I tend not to add debug point at the suspend point as that is where coroutine changes the code. Instead, add a debugger at some lambda maybe inside coroutineScope, or inside the body of a suspend fun.

Also you can add Log.d("CoroutineDebug", "your message") in android or println in Java project to get some info about your code execution.

BTW mentioned, issues https://youtrack.jetbrains.com/issue/KT-22296 and https://youtrack.jetbrains.com/issue/KT-25076 are already closed. So you will be able to evaluate the variables easily while debugging