Does any one know the proper way to access the Liv...

# compose

[John Aoussou]

Does any one know the proper way to access the LiveData that you get from a room database in compose? I'm sure the DB is not empty, because when I do the following the correct entry is printed:

val items = viewModel.readAllData.observeAsState()
val TAG = "check"
val item1 = items.value?.get(0)?.original
Log.i(TAG,item1.toString())

However, if I try to show the text in a Text element like so

Column{
    Text(text = item1!!)
}

it tells me the List is empty ¯\_(ツ)_/¯

[Csaba Kozák]

!! you have an unsafe operator here. You should check if it is not null (and empty), and display it in that case.

val items by viewModel.readAllData.observeAsState()

if (!items.isNullOrEmpty()) {
  Text(text = items!!.first()) // safe to call here
}

[John Aoussou]

@Csaba Kozák Thank you. I did think of doing that, but I thought it was bad practice in Kotlin to check for nullity manually?

Also, why does it work in the Log?

(if it's a long explanation please don't bother).

[Csaba Kozák]

In the first snippet, you are using a safe-call operator ?. , so event when it is null first, you should see itt logging null, but no crash.

[Csaba Kozák]

Well, you can call it manual null check, but in the end, it generates the same code. Instead of the if, you could also use items?.let { if you want.