Android 删除项目时延迟列不更新

我正在try 从LazyColumn中删除一项.以下是我的代码:

MyViewModel.kt:

class MyViewModel:ViewModel() {

    val items = MutableLiveData<List<Items>>()

    fun removeItem(item: Items) {
        items.value = items.value?.filter { it != item }?.toList()
    }

MainActivity.kt:

class MainActivity : ComponentActivity() {
    @ExperimentalFoundationApi
    @SuppressLint("UnusedMaterialScaffoldPaddingParameter")
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        val viewmodel = ViewModelProvider(this).get(MyViewModel::class.java)
        setContent {
            JetPackAppTheme {

 val list = Mylist()
            val getData = list.getData()
                viewmodel.items.value=getData

  LazyColumn(
                        verticalArrangement = Arrangement.spacedBy(12.dp),
                        contentPadding = PaddingValues(all=16.dp),


                        ) {

                        items(items = viewmodel.items.value!!) { item->
                            CustomItem(item = item,
                                onItemClick = {
                                    viewmodel.removeItem(it)
                                    
                                }
}

}

}

}

问题是LazyColumn不会更新，而是MyViewModel中的项会更新 类更新.