I have been trying to use BindingAdapter in Android Studio 3.4 (the last update) with Kotlin for days now and nothing seems to work.
I first tried with the following tutorial: https://codelabs.developers.google.com/codelabs/android-databinding/#7 And it was outputing an error as soon as I reached the 8th step.
Furthermore I tried the simple example possible with an Empty Application, a single Activity, a single ViewModel, and a single BindingAdapter. Here is the XML code.
<?xml version="1.0" encoding="utf-8"?>
<layout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto">
<data>
<variable name="viewmodel"
type="com.example.testbindingadapter.DataViewModel"/>
</data>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:greetings="@{viewmodel.name}"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:id="@+id/textView"/>
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>
Now here is the ViewModel with the BindingAdapter
class DataViewModel : ViewModel() {
private val _name = MutableLiveData<String>()
val name : LiveData<String> = _name
init {
_name.value = "Amath"
}
}
@BindingAdapter("greetings")
fun setName(view: TextView, text: String) {
view.text = "Welcome, $text"
}
I have also enabled dataBinging in my Graddle. I added apply plugin: 'kotlin-kapt' as suggested in the following thread Cannot find the setter for attribute in Data binding. At first I had an error msg:Cannot find the setter for attribute databinding subsequently the error disappeared, but the app simply crashed.
Can you help ?
