vitorvigano

val email = MutableStateFlow("")
    val password = MutableStateFlow("")
    val isEmailAndPasswordValid = MutableStateFlow(false).apply {
        viewModelScope.launch {
            combine(email, password) { n1, n2 ->
                validate(n1, n2)
            }.collect { isValid ->
                value = isValid
            }
        }

vitorvigano

val email = MutableLiveData<String>()
    val password = MutableLiveData<String>()
    val isEmailAndPasswordValid = MediatorLiveData<Boolean>().apply {
        addSource(email) { validate() }
        addSource(password) { validate() }
    }

    private fun validate() {
        isEmailAndPasswordValid.value =
            email.value.orEmpty().isNotEmpty() && password.value.orEmpty().isNotEmpty()

vitorvigano

<LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:padding="20dp">

        <com.rengwuxian.materialedittext.MaterialEditText
            android:id="@+id/email"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"