Extract String in useCase in Composable

Question

My task is to show error when user click submit (if there is one).

For that I have :

data class ValidationResults(
    val successful: Boolean,
    val errorMessage: String? = null
)

Example of input mistake:

@Singleton
class ValidateUsername @Inject constructor() {
    fun execute (username: String) : ValidationResults{

       if(username.isBlank()){
                return ValidationResults(
                    successful = false,
                    errorMessage =  R.string.register_user_empty_user_field.toString()
                )
            }

In presentation:

if(state.username != null){
        Text(
            text = state.usernameError,
            color = Color.Red
        )
    }

But I only get Int

How to properly call String from Resources.

EDIT: I get this error if using:

stringResource(id = R.string.register_user_empty_user_field)

@Composable invocations can only happen from the context of a

Thracian · Accepted Answer · 2022-12-16 17:57:33Z

1

You need call stringResource(id = R.string.register_user_empty_user_field)

answered Dec 16, 2022 at 17:57

Thracian

69.9k22 gold badges215 silver badges407 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Equlo · Accepted Answer · 2022-12-16 18:28:14Z

0

I injected Application in ViewModel:

@HiltViewModel
class RegistrationViewModel @Inject constructor(
    private val validateUsername: ValidateUsername,
    private val validatePassword: ValidatePassword,
    private val validateRepeatedPassword: ValidateRepeatedPassword,
    private val applicationContext: Application
    ) : ViewModel()

And then just send it to function and use it like this:

 errorMessage = applicationContext.getString(R.string.register_user_username_field_to_short)

answered Dec 16, 2022 at 18:28

Equlo

1974 silver badges19 bronze badges

Collectives™ on Stack Overflow

Extract String in useCase in Composable

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related