Use case When I open a screen I want a textField to be focus

Question

Use case When I open a screen I want a textField to be focused immediately and have the keyboard show More in thread thread

Stylianos Gakis · Answer

Currently I am doing something like ``` Composable fun Comp val focusRequester = remember FocusRequester DisposableEffect Unit focusRequester requestFocus onDispose focusRequester freeFocus Might not even need this since at this point I ve left this screen BasicTextField modifier = Modifier focusRequester focusRequester ``` But I am getting the error of ```1 Remember the FocusRequester val focusRequester = remember FocusRequester 2 Did you forget to add a Modifier focusRequester 3 Are you attempting to request focus during composition Focus requests should be made in response to some event Eg Modifier clickable focusRequester requestFocus ``` I can t find anything in the documentation regarding focus aside from just the <https developer android com reference kotlin androidx compose ui focus package summary androidx compose ui Modifier focusRequester androidx compose ui focus FocusRequester |package reference> but it doesn t help with my use case What is the proper way to achieve this

Stylianos Gakis · Answer

Hmm using `LaunchedEffect` instead of `DisposableEffect` ```LaunchedEffect Unit focusRequester requestFocus ``` Seems to be getting the focus alright I guess LaunchedEffect happens 1 frame after composition suceeded while DisposableEffect happens at composition and the focusRequester modifier wasn t called yet And it even opened the keyboard once but it s not consistent about it thinking face Plus I am getting a super weird case where I use the back gesture and the keyboard opens and closes instead of going back but at this point I m pretty sure I must be messing something up badly Is there any sort of official documentation about handling focus that I can follow to avoid all these weird things I am doing joy

Joseph Hawkes-Cates · Answer

I have been using LaunchedEffect as well for this I haven t found much in the way of official docs for this I generally observe that the keyboard dismisses once the focused field is no longer in composition but I have had a few times where the keyboard doesn t dismiss after navigating to a different view It s inconsistent and random so I haven t hunted down why it s happening yet

Joseph Hawkes-Cates · Answer

I originally had a call to dismiss the keyboard when I navigate away from a view that uses it but I ran into timing issues if the next screen needed the keyboard so that ended up being worse than the rare cases where it doesn t dismiss now It s something I ll have to address before we release though

FunkyMuse · Answer

``` Composable fun SearchBarComponent keyboardController SoftwareKeyboardController = LocalSoftwareKeyboardController current onTextChanged String gt Unit = null var text by rememberSaveable mutableStateOf val focusRequester = remember FocusRequester TextField modifier = Modifier fillMaxWidth focusRequester focusRequester height 56 dp value = text onValueChange = text = it onTextChanged invoke it DisposableEffect Unit focusRequester requestFocus keyboardController show onDispose focusRequester freeFocus keyboardController hide ```

Stylianos Gakis · Answer

But Hristijan doesn t this come with the problem I mentioned above By the time focusRequester requestFocus is called the FocusRequester might not be initialized and requestFocus is called during composition throwing an exception Are you using this in your apps already

FunkyMuse · Answer

Yes i use it in my app already works perfectly so far no complaints