WithViewModelActivity

class MainActivity : AppCompatActivity() {

  // initialize view model, in this case using koin extension
  private val viewModel: MainViewModel by viewModel()
  
  // observe value
  viewModel.name.observe(this, ::setName)
  private fun setName(name: String?) = binding.edtName.setText(name)
  
  // fetch data on the first time / activtity created
  viewModel.fetch()

  // save name when button clicked
  viewModel.saveName(name)
}