【ANDROID STUDIO】View Model Scope, run in the background

 package com.example.viewmodelscope

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import androidx.lifecycle.Observer
import androidx.lifecycle.ViewModelProvider

class MainActivity : AppCompatActivity() {
    private lateinit var mainActivityViewModel : MainActivityViewModel
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        var mainActivityViewModel = ViewModelProvider(this).get(MainActivityViewModel::class.java)
        mainActivityViewModel.getUserData()
        mainActivityViewModel.users.observe(this, Observer { myUsers ->
            myUsers.forEach {
                Log.i("MyTag", " name is ${it.name}")// it will run in the background
            }

        })

    }
}

package com.example.viewmodelscope

import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import kotlinx.coroutines.withContext

class MainActivityViewModel: ViewModel() {
    private var userRepository = UserRepository()
    var users : MutableLiveData<List<User>> = MutableLiveData()

    fun getUserData() {
        viewModelScope.launch {
            var result: List<User>? = null
            withContext(Dispatchers.IO) {
                result = userRepository.getUsers()
            }
            users.value = result
        }
    }


}

package com.example.viewmodelscope
import kotlinx.coroutines.delay
class UserRepository {
    suspend fun getUsers(): List<User> {
        delay(8000)
        val users: List<User> = listOf(
            User(1, "Sam"),
            User(2, "Taro"),
            User(3, "Jane"),
            User(4, "Amy")

        )
        return users
    }
}
package com.example.viewmodelscope

data class User(val id : Int , val name : String)