Bundle Delegate

ArgumentDelegateUsage.kt

class UsageFragment : Fragment() {

  private val numberWhatever by Argument("ARG_PROPERTY", 0)

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    //same behaviour tham BundleParam but withArguments in fragments
    print("$numberWhatever!")

  }

}

BundleDelegateUsage.kt

class UsageActivity : Activity() {

  private val numberWhatever by BundleParam("EXTRA_PROPERTY", 0)
  
  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    //here we will get the property from the activity intent thanks to delegating it
    print("$numberWhatever!")
    
  }

}

PrefParamDelegateUsage.kt

@Singleton
class UsagePrefs(context: Context) {

  //we can observe changes of properties to update others
  var userName: String by PrefParam(context = context, default = "") { lastUpdate = today.time}

  private var lastUpdate: Long by PrefParam(context = context, default = 0L)


}