gist for CleanAndroidCode article series https://medium.com/@anton.averin.dev/keep-your-droid-clean-e9c093140eb6

CleanAndroidCode :: Error Handling :: 0 UIResolution.kt

open class UIResolution @Inject constructor(val uiResolver: UIResolver) : ResolutionByCase() {

    override fun onConnectivityAvailable() {
        uiResolver.hidePersistentSnackBar()
    }

    override fun onConnectivityUnavailable() {
        uiResolver.showPersistentSnackBar(R.string.error_no_network_connection)
    }

    override fun onNotFound() {
        uiResolver.showSnackBar(R.string.error_not_found)
    }

    override fun onServiceUnavailable() {
        uiResolver.showSnackBar(R.string.error_service_unavailable)
    }

    override fun onInternalServerError() {
        uiResolver.showSnackBar(R.string.error_http_exception)
    }

    override fun onGenericRxException(t: Throwable) {
        t.printStackTrace()
    }

    override fun onNetworkLocationError() {
        uiResolver.showSnackBar(R.string.error_enable_gps)
    }
}

CleanAndroidCode :: Error Handling :: 1 UIResolver.kt

@ActivityScope
class UIResolver @Inject constructor(var baseActivity: BaseActivity) {

    private val snackbarRoot: ViewGroup

    init {
        snackbarRoot = baseActivity.findViewById(R.id.content) as ViewGroup
    }

    private var persistentSnackbar: Snackbar? = null

    fun showSnackBar(messageResource: Int) {
        Snackbar.make(snackbarRoot, messageResource, Snackbar.LENGTH_LONG).show()
    }

    fun showPersistentSnackBar(messageResource: Int) {
        persistentSnackbar = Snackbar.make(snackbarRoot, messageResource, Snackbar.LENGTH_INDEFINITE)
        persistentSnackbar?.show()
    }

    fun hidePersistentSnackBar() {
        persistentSnackbar?.dismiss()
    }

}