Android: What is the best way to access ViewModel method from Broadcast receiver?

Question

I have a viewmodel with a method Refresh(), which accesses DB and updates UI. I need to call this method whenever Airplane mode changes. How to do this?

Implementation of Broadcast receiver:

class AirplaneModeChanged() : BroadcastReceiver() {

    override fun onReceive(p0: Context?, p1: Intent?) {
        if (p1?.action?.equals(Intent.ACTION_AIRPLANE_MODE_CHANGED) == true) {
            /* MyViewModel.refresh() */
        }
    }
}

Implementation of Viewmodel:

class MyViewModel(application: Application) : AndroidViewModel(application) {
    fun refresh() 
    { 
        /* Access DB and update UI */ 
    }

}

MainActivity:

class MainActivity : ComponentActivity(), LifecycleOwner {
    private val viewModel: MyViewModel by viewModels()
    private val airplaneModeChanged = AirplaneModeChanged()

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        ContextCompat.registerReceiver(applicationContext, airplaneModeChanged, IntentFilter(Intent.ACTION_AIRPLANE_MODE_CHANGED),
            ContextCompat.RECEIVER_NOT_EXPORTED)

    }

    override fun onDestroy() {
        super.onDestroy()
        unregisterReceiver(airplaneModeChanged)
    }
}

Answer 1

The best way is to not try to access your ViewModel from the BroadcastReceiver. Instead, have both of these classes call a third class that does what you want done.

class MyDataSource { 
    fun fetchData(){}
}

Then you can do

class AirplaneModeChanged(val dataSource : MyDataSource) : BroadcastReceiver() {

    override fun onReceive(p0: Context?, p1: Intent?) {
        if (p1?.action?.equals(Intent.ACTION_AIRPLANE_MODE_CHANGED) == true) {
            dataSource.fetchData()
        }
    }
}

and

class MyViewModel(application: Application, val dataSource : MyDataSource) : AndroidViewModel(application) {
    fun refresh() 
    { 
        dataSource.fetchData()
    }

}