Android, how to print out coroutine id or name on a custom log function

Question

I want to modify this log helper function to print out coroutine id or name.

   @JvmInline
   value class MyLogger(private val tag: String) {       
    fun log(level: Level, e: Throwable? = null, message: String) {
    if (isLoggingEnabled(level)) {
        val logTime = System.currentTimeMillis()
        val messageWithCoroutineInfo = "Running on: [${Thread.currentThread().name}] | $message"
        when (level) {
            Level.VERBOSE -> Log.v(tag, messageWithCoroutineInfo, e)
            Level.DEBUG -> Log.d(tag, messageWithCoroutineInfo, e)
            Level.INFO -> Log.i(tag, messageWithCoroutineInfo, e)
            Level.WARN -> Log.w(tag, messageWithCoroutineInfo, e)
            Level.ERROR -> Log.e(tag, messageWithCoroutineInfo, e)
            Level.ASSERT -> Log.wtf(tag, messageWithCoroutineInfo, e)
        }
    }
}
 ....
}


private val logger = MYLogger("Navigator")
logger.i { "goTo: $screen; backstack: [${backStack.joinToString()}]" }

In onCreate function:

    override fun onCreate(savedInstanceState: Bundle?) {

    super.onCreate(savedInstanceState)
    System.setProperty("kotlinx.coroutines.debug", if(!BuildTypes.isProduction) "on" else "off")

it can print out the thread name, but it can't print out the coroutine id or name, such as [AWT-EventQueue-0 @coroutine#40], any suggestion?

Unclear if you've seen: How to get the name of a coroutine in Kotlin? — Morrison Chang
– Morrison Chang, Commented Feb 13 at 4:12

Brian Yencho · Accepted Answer · 2025-03-13 14:19:36Z

0

The information you are looking for is likely in the current coroutine context, which you can get from currentCoroutineContext() inside any suspending function. For example

fun main() {
    val deferred = CoroutineScope(Dispatchers.Default)
        .async {
            println("Coroutine context : ${currentCoroutineContext()}")
        }
    runBlocking { deferred.await() }
}

will print off

Coroutine context : [DeferredCoroutine{Active}@76ff1b25, Dispatchers.Default]

The currentCoroutineContext function is only available inside a suspending function, though, so this would require a modification of how your logger works currently.

answered Mar 13 at 14:19

Brian Yencho

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