How to restrict input length using two-way data binding with live data the correct way? - android-layout

Question

I am building an app where users have to input some information. For that reason, I am using TextInputLayout
and TextInputEditText to have more interaction with them. For instance, when the user input more than 5 characters I would like to show an error message etc.
At the moment I am able to do the input restriction, however, most of the code is in the Activity and that is not what I like to have. Also, I have to assign the TextInputEditText in the activity to set a new string back to that field layout so I do not think that this is correct two-way data binding.
My main goal here is to restrict the user to input more than 5 characters and more importantly keep all the code inside the ViewModel.
Screen:
...
...
Layout:
...
<com.google.android.material.textfield.TextInputLayout
android:id="#+id/til_2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="5dp"
android:layout_marginEnd="5dp"
android:gravity="center"
android:hint="#string/hint_order"
tools:hint="#string/hint_order"
app:errorEnabled="true"
app:errorTextColor="#color/red_currant_red"
app:passwordToggleEnabled="true"
app:passwordToggleTint="#color/row_text_brown"
app:boxBackgroundColor="#color/white"
app:counterEnabled="true"
app:counterMaxLength="5"
android:minHeight="20dp"
app:expandedHintEnabled="false"
app:hintAnimationEnabled="false"
style="#style/Widget.MaterialComponents.TextInputLayout.OutlinedBox.Dense"
android:layout_column="1">
<com.google.android.material.textfield.TextInputEditText
android:id="#+id/tiet_2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:selectAllOnFocus="true"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="#color/black_text"
android:textColorHighlight="#color/blue_onahau"
android:text="#={ myNewViewModel._inputWordOrderTextInt}"
android:inputType="textPassword"/>
</com.google.android.material.textfield.TextInputLayout>
...
ViewModel:
...
val _inputWordOrderTextInt = MutableLiveData<String>()
val inputWordOrderTextInt: LiveData<String>
get() = _inputWordOrderTextInt
...
Activity:
...
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityNewWordBinding.inflate(layoutInflater)
binding.myNewViewModel = newWordViewModel
val view = binding.root
setContentView(view)
manageInputTypeForWordOrderTextInt()
}
...
private fun manageInputTypeForWordOrderTextInt() {
newWordViewModel.inputWordOrderTextInt.observe(this, Observer { input ->
if (input != null && input.isNotEmpty()) {
if (input.length > 5) {
val newInput = input.substring(0, 5)
binding.tiet2.setText(newInput)
binding.tiet2.setSelection(newInput.length)
}
}
})
}
...