Kotlin collectAsState 未从存储库接收更改

我已经用Compose课程完成了大部分Android基础知识，只需要做工作管理器和视图，但我已经完成了房间部分，并试图将其应用到我的第一个应用程序中，这是一个愚蠢的随机鼓舞士气的生成器.

每次打开应用程序时，我都会让一切都能生成一个新的对话，但我无法让我的按钮工作来允许用户生成新的对话.我也相信这其中有很多是可以优化的，并希望得到反馈，但目前我的重点是基本功能.

这是刀的一部分

@Query("SELECT saying from phrases WHERE type = 'greeting' ORDER BY RANDOM() LIMIT 1")
fun getGreeting(): Flow<String?>

@Query("SELECT saying from phrases WHERE type = 'first' ORDER BY RANDOM() LIMIT 1")
fun getFirst(): Flow<String?>

@Query("SELECT saying from phrases WHERE type = 'second' ORDER BY RANDOM() LIMIT 1")
fun getSecond(): Flow<String?>

@Query("SELECT saying from phrases WHERE type = 'ending' ORDER BY RANDOM() LIMIT 1")
fun getEnding(): Flow<String?>`

然后在存储库中(我相信这是可以改进的)

fun getNewTalk(): Flow<String> {
    val greeting: Flow<String?> = phraseDao.getGreeting()

    val first: Flow<String?> = phraseDao.getFirst()

    val second: Flow<String?> = phraseDao.getSecond()

    val ending: Flow<String?> = phraseDao.getEnding()

    val firstHalf = greeting.combine(first) { greeting, first ->
        "$greeting $first"
    }

    val secondHalf = second.combine(ending) { second, ending ->
        "$second $ending"
    }

    val currentTalk = firstHalf.combine(secondHalf) {firstHalf, secondHalf->
        "$firstHalf $secondHalf"
    }

    return currentTalk
}

和视图模型

class PepTalkScreenViewModel (
        private val pepTalkRepository: PepTalkRepository
    ) : ViewModel() {

    val currentTalk = pepTalkRepository.getNewTalk()

    companion object {
        val Factory: ViewModelProvider.Factory = viewModelFactory {
            initializer {
                val application = (this[APPLICATION_KEY] as PepTalkApplication)
                val pepTalkRepository = application.pepTalkRepository
                PepTalkScreenViewModel(pepTalkRepository = pepTalkRepository)
            }
        }
    }
}

和主屏幕

@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun PepTalkScreen(
    modifier: Modifier = Modifier
){
    val pepTalkViewModel: PepTalkScreenViewModel = viewModel(factory = PepTalkScreenViewModel.Factory)
    val pepTalk by pepTalkViewModel.currentTalk.collectAsState(initial = "")
    //I've also tried collectAsStateWithLifecycle(initialValue = "") but no change in behavior

    Scaffold (
        .....
        PepTalkCard(pepTalk = pepTalk)
        .....
       bottomBar = { BottomAppBar(pepTalk = pepTalk)}

脚手架中是对可组合卡片的函数的调用

@Composable
fun PepTalkCard(
    pepTalk: String,
    modifier: Modifier = Modifier
){
    Card(
        modifier = modifier
            .fillMaxSize()
    ){
        Text(
            text = pepTalk,
            style = MaterialTheme.typography.displayMedium,
            modifier = Modifier
        )
    }
}

脚手架还调用底部的应用程序栏，其中有一个用于生成新对话的按钮和一个用于分享的按钮，这就是我的问题所在.为了让它再次查询DAO，我try 了onClick部分中的一些令人头疼的东西，但找不到我遗漏了什么.

@Composable
fun BottomAppBar (
    pepTalk: String,
    modifier: Modifier = Modifier
){
    val pepTalkViewModel: PepTalkScreenViewModel = viewModel(factory = PepTalkScreenViewModel.Factory)
    Row(
        modifier = Modifier
            .fillMaxWidth(),
        horizontalArrangement = Arrangement.SpaceEvenly
    ) {
        //region New Button
        Button(onClick = {
            pepTalkViewModel.currentTalk
        }) {

我认为调用变量curentTalk会刷新单词，因为它等于存储库中的函数.我试过做可变状态的东西，和实时数据，总是有一些东西抱怨没有匹配正确的类型，比如StateFlow来流动，感觉这应该不是一件复杂的事情.我已经在谷歌上搜索了几天了，有很多方法可以做到这一点，而且最佳实践似乎已经随着时间的推移而发生了变化，特别是在Compose方面.

任何向好的方向提供的帮助或指导都将不胜感激.