android - Android 双向数据绑定使用 MutableStateFlow 并观察 ViewModel 的变化

Question

刚学MutableStateFlow，想换MutableLiveData。另外Android不建议我们LiveData在里面观察ViewModel（除非你用过observeForever(observer)但是你要记得把它去掉，这样有点麻烦）。

data class Student(var id: Long, var name: String, var countryIndex: Int)

class FirstViewModel(application: Application) : AndroidViewModel(application) {
    val uiScope = viewModelScope               //Main Dispatcher

    val countries = listOf("China", "America", "Japan", "Korea")
    val student = Student(0, "Kate", 2)        //faking database object  

    val country = MutableStateFlow(countries[student.countryIndex])    //two-way bind with AutoCompleteTextView "text" attribute

    init {
        observeCountry()
    }

    private fun observeCountry() = uiScope.launch {        //<- should move to other Dispatcher??
        country.collect { country ->
            countries.indexOf(country).let { student.countryIndex = it }    //country name -> country index -> update Student object
        }
    }
}

上面的代码工作得很好，但我想确保我MutableStateFlow在这个例子中是否正确使用。我需要切换到Dispatchers.Default吗collect{}？