How to always redraw a #Composable? - android-jetpack-compose

Question

I have a composable like here.
#Composable
fun MyBasicTextField() {
val keyboardController = LocalSoftwareKeyboardController.current
val focusRequester = remember{ FocusRequester() }
BasicTextField(
modifier = Modifier
.focusRequester(focusRequester),
keyboardActions = keyboardActions ?: KeyboardActions(onAny = { keyboardController?.hide() }),
)
LaunchedEffect(Unit) {
Log.d(TAG, "focusRequester.requestFocus()")
focusRequester.requestFocus()
}
}
When the screen where this composable is used opens for the first time, always the keyboard is shown (above log message is visible).
Then I leave the app at that state and open another app (opening a link on that screen, which opens the default browser for instance)
Tapping on the BACK button (triangle) leaved the other app (e.g. webbrowser) and comes back to the initial screen: Either with opened Android keyboard on some devices or without any keyboard showing.
I have the feeling that the screen did not notice the missing keyboard (which disappreared while leaving the app for the browser) and thus does not recompose anything?
Can I flag to compose the screen from fresh everytime I re-/compose it?

Answer 1

I'm not sure why you need this, because focusing and showing keyboard every time re-composition happens may be undesirable, what if the user is doing something else on the screen which updates the field, you don't want want to show the keyboard but re-composition happens and you pop it again.
Having said this it's of course doable:
For example the argument passed into the LaunchedEffect determines if during re-composition the block will be run.
So you could try something like this:
#Composable
fun MyBasicTextField() {
val keyboardController = LocalSoftwareKeyboardController.current
val focusRequester = remember{ FocusRequester() }
var launchKey by remember { mutableStateOf(0) }
BasicTextField(
modifier = Modifier
.focusRequester(focusRequester),
keyboardActions = keyboardActions ?: KeyboardActions(onAny = { keyboardController?.hide() }),
)
//passing launchKey instead of Unit
LaunchedEffect(launchKey++) {
Log.d(TAG, "focusRequester.requestFocus()")
focusRequester.requestFocus()
}
}