Coroutine Unregister Reciever On Cancel

My coroutine leaks a broadcast receiver, when the service is stopped. This is because the service stops, before the callback is finished. How can I cancel coroutine in a way that l

Solution 1:

The answer was indeed to use suspendCancellableCoroutine and define cont.invokeOnCancellation as written below:

suspend fun getCurrentScanResult(): List<ScanResult> =
        suspendCancellableCoroutine { cont ->
            //define broadcast reciever
            val wifiScanReceiver = object : BroadcastReceiver() {
                override fun onReceive(c: Context, intent: Intent) {
                    if (intent.action?.equals(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION) == true) {
                        context.unregisterReceiver(this)
                        cont.resume(wifiManager.scanResults)
                    }
                }
            }
            //setup cancellation action on the continuation
            cont.invokeOnCancellation {
                context.unregisterReceiver(wifiScanReceiver)
            }
            //register broadcast reciever
            context.registerReceiver(wifiScanReceiver, IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION))
            //kick off scanning to eventually receive the broadcast
            wifiManager.startScan()
        }