如何在JetPack组成的二次吐司？

Question

我每次添加/删除在Firebase中添加/删除项目的操作完成时都需要显示一条消息。这些是接口中的功能：

suspend fun addItem(item: Item): Response<Unit>
suspend fun deleteItem(item: Item): Response<Unit>

这些是实现：

override suspend fun addItem(item: Item) = try {
    itemsRef.add(item).await()
    Response.Success(Unit)
} catch (ex: Exception) {
    Response.Failure(ex)
}

override suspend fun deleteItem(item: Item) = try {
    itemsRef.document(item.id).delete().await()
    Response.Success(Unit)
} catch (ex: Exception) {
    Response.Failure(ex)
}

在ViewModel中，我称为

addItem

并重置这样的操作状态：

class ItemViewModel @Inject constructor(
    private val repo: ItemRepository
): ViewModel() {
    private val _addItemResponse = MutableStateFlow<Response<String>?>(null)
    val addItemResponse: StateFlow<Response<String>?> = _addItemResponse.asStateFlow()

    private val _deleteItemResponse = MutableStateFlow<Response<String>?>(null)
    val deleteItemResponse: StateFlow<Response<String>?> = _deleteItemResponse.asStateFlow()

    fun addItem(item: Item) = viewModelScope.launch {
        _addItemResponse.value = Response.Loading
        _addItemResponse.value = repo.addItem(item)
    }

    fun deleteItem(item: Item) = viewModelScope.launch {
        _deleteItemResponse.value = Response.Loading
        _deleteItemResponse.value = repo.addItem(item)
    }

    fun resetAddItemState() = _addItemResponse.value?.let {
        _addItemResponse.value = null
    }

    fun resetDeleteItemState() = _deleteItemResponse.value?.let {
        _deleteItemResponse.value = null
    }
}

在UI内部我使用：

when(val addItemResponse = viewModel.addItemResponse.collectAsStateWithLifecycle().value) {
    is Response.Loading -> CircularProgressIndicator()
    is Response.Success -> {
        Toast.makeText(context, "Added", Toast.LENGTH_LONG).show()
        resetAddItemState()
    }
    is Response.Failure -> Text(addItemResponse.ex)
}

when(val deleteItemResponse = viewModel.deleteItemResponse.collectAsStateWithLifecycle().value) {
    is Response.Loading -> CircularProgressIndicator()
    is Response.Success -> {
        Toast.makeText(context, "Deleted", Toast.LENGTH_LONG).show()
        resetDeleteItemState()
    }
    is Response.Failure -> Text(deleteItemResponse.ex)
}

当我添加一个项目时，显示第一个吐司。如果我删除项目并等待第二个吐司消失，则正确显示第二个吐司。但是，如果我添加一个项目并立即将其删除而不等待第一个吐司消失，则会显示第二个吐司。如何解决这个问题？

尝试使用应用程序context

Answer 1

toast.maketext（applicationContext，“ message”，toast.length_short）.show（）

希望它会起作用。