WidgetUpdateNotifierImpl.kt

class WidgetUpdateNotifierImpl : WidgetUpdateNotifier {

    override fun refreshWidget(context: Context) {
        val intent = Intent(context, YourWidgetClassName::class.java)
        intent.action = AppWidgetManager.ACTION_APPWIDGET_UPDATE
        val componentName = ComponentName(context, YourWidgetClassName::class.java)
        val ids: IntArray = AppWidgetManager.getInstance(context).getAppWidgetIds(componentName)
        intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, ids)
        context.sendBroadcast(intent)
    }
}