mvvm databinding

databinding.xml

<?xml version="1.0" encoding="utf-8"?>
<layout
    xmlns:android="http://schemas.android.com/apk/res/android">

    <!-- 데이터바인딩 정의 -->
    <data>
        <variable
            name="vm"
            type="MainViewModel" />
    </data>

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <TextView
            android:id="@+id/et_lottie_list"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" 
            android:text="@{vm.name}"
            android:onClick="@{(() -> vm.nameClick()}" />
    </FrameLayout>
</layout>

mvvm_databinding.kt

class MainActivity : Activity() {
  fun onCreate() {
    val tv : TextView = findViewById(R.id.tv)
    // ViewModel 정의
    val viewModel = MainViewModel()
    // View-ViewModel 바인딩
    dataBinding.setVariable(BR.vm, viewModel)
    
  }
}

class MainViewModel {
  // databinding 을 통해 view 와 연결
  val name = ObservableField("")
  
  init {
    name.set(initName())
  }
  
  private fun initName() : String = "John"

  // databinding 을 통해 view 와 연결  
  fun nameClick() = name.set("Click!!")
}