BindingAdapterInAction.kt

class MainActivity {

  // ...
  
  private val viewModel by viewModels { viewModelFactory }
  
  private lateinit var adapter: DataBindingAdapter
  
  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
    
    adapter = DataBindingAdapter()
    
    recyclerView.layoutManager = LinearLayoutManager(context)
    recyclerView.adapter = adapter
    
    observeData()
  }
  
  private fun observeData() {
    viewModel.items.observe(this) { items ->
      val bindingEntries = items.map { item -> 
        DataBindingEntry(R.layout.main_item, mapOf(BR.item, item)) 
      }
      adapter.update(bindingEntries)                   
    }
  }
}