MutableLiveData 的预期不可为空值

Question

private val _users = MutableLiveData<List<User>>()
val users: LiveData<List<User>> get() = _users

fun getUsers() {
    viewModelScope.launch {
        _users.value = users()
    }
}

suspend fun users(): List<User> {
    TODO("Not implemented")
}

I get following error on _users.value = users()

Expected non-nullable value. Inspection info: This check ensures that LiveData values are not null when explicitly declared as non-nullable.

I'm using lifecycle version 2.3.1 . The problem seems to be with suspend function users(). If I remove the suspend modifier it works fine.

Answer 1

Just use private val _users:MutableLiveData<List<User>> = MutableLiveData() instead of private val _users = MutableLiveData<List<User>>() .

Answer 2

Try this._users.value = users() . Adding this at the front works for me. Not sure why. In your case you might need this@yourModel._users.value = users() since you are calling it in the viewModelScope.