fergusonm

package com.example.launchwhendemo.ui.main

import android.os.Bundle
import android.util.Log
import android.view.View
import android.widget.Button
import androidx.fragment.app.Fragment
import androidx.lifecycle.ViewModel
import androidx.lifecycle.ViewModelProvider
import androidx.lifecycle.viewModelScope

fergusonm

package com.example.launchwhendemo.ui.main

import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.fragment.app.Fragment
import androidx.lifecycle.*
import com.example.launchwhendemo.R
import kotlinx.coroutines.channels.Channel

fergusonm

private val eventChannel = Channel<Event>(Channel.BUFFERED)
val eventsFlow = eventChannel.receiveAsFlow()

fergusonm

override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        viewModel.eventsFlow
                .onEach {
                    when (it) {
                        MainViewModel.Event.NavigateToSettings -> {}
                        is MainViewModel.Event.ShowSnackBar -> {}
                        is MainViewModel.Event.ShowToast -> {}
                    }

fergusonm

class FlowObserver<T> (
    lifecycleOwner: LifecycleOwner,
    private val flow: Flow<T>,
    private val collector: suspend (T) -> Unit
) {

    private var job: Job? = null

    init {
        lifecycleOwner.lifecycle.addObserver(LifecycleEventObserver {

fergusonm

override fun onStart() {
    super.onStart()
    job = viewModel.eventsFlow
            .onEach {
                when (it) {
                    MainViewModel.Event.NavigateToSettings -> {}
                    is MainViewModel.Event.ShowSnackBar -> {}
                    is MainViewModel.Event.ShowToast -> {}
                }
            }

fergusonm

override fun onStart() {
    super.onStart()
    disposable = viewModel.eventsFlow
            .asObservable() // converting to Rx for the example
            .subscribe {
                when (it) {
                    MainViewModel.Event.NavigateToSettings -> {}
                    is MainViewModel.Event.ShowSnackBar -> {}
                    is MainViewModel.Event.ShowToast -> {}
                }

fergusonm

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    // get your view model here

    lifecycleScope.launchWhenStarted {
        viewModel.eventsFlow
                .collect {
                    when (it) {
                        MainViewModel.Event.NavigateToSettings -> {}
                        is MainViewModel.Event.ShowSnackBar -> {}

fergusonm

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)
    viewModel.eventsFlow
            .onEach { 
                when (it) {
                    is MainViewModel.Event.NavigateToSettings -> {}
                    is MainViewModel.Event.ShowSnackBar -> {}
                    is MainViewModel.Event.ShowToast -> {}
                }
            }

fergusonm

class MainViewModel : ViewModel() {

    sealed class Event {
        object NavigateToSettings: Event()
        data class ShowSnackBar(val text: String): Event()
        data class ShowToast(val text: String): Event()
    }

    private val eventChannel = Channel<Event>(Channel.BUFFERED)
    val eventsFlow = eventChannel.receiveAsFlow()