Collect Flows in Service

user_7027154 0
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So, I'm trying to collect data from flows in my Foreground service (LifecycleService) in onCreate(), but after the first callback, it is not giving new data.

The code is :

    override fun onCreate() {
        super.onCreate()

        lifecycleScope.launchWhenStarted {
            repeatOnLifecycle(Lifecycle.State.STARTED) {
                observeCoinsPrices()
            }
        }
    }
kotlin-flow kotlin-coroutines foreground-service service android
2 Answers

I couldn't get lifecycleScope.launch to work in the LifecycleService.onCreate method without it freezing the app, so what I did instead was moved the collector into a method that I use to start the service, assign the Job into a property so I can cancel it when the Service is destroyed.

import kotlinx.coroutines.Job
//...

class MyService : LifecycleService() {
 //...
 private lateinit var myJob: Job

   // my custom method for starting The Foreground service
   fun startTheService() {
      // call startForeground()
      
      //...

      myJob = lifecycleScope.launch {
          collectFromFlow()
        }
    }

    override fun onDestroy() {
       myJob.cancel()
    }
}

In my case, I was wanting to update text in the foreground notification every time a value was emitted to my Flow collector.

user_24457630

Because Flow used in observeCoinsPrices() not replay the latest value (replay < 1). You should change Flow logic

user_111914240
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