My goal is to build a scrollable home screen widget. I'm trying to use Kotlin, but Java solutions are welcome too. Every documentation I found online was either outdated or did not include scrolling. ScrollView does not seem to be supported, so I tried to use a ListView. As far as I know you can only add content to ListViews programmatically. I tried
class NewAppWidget : AppWidgetProvider() {
override fun onUpdate(context: Context, appWidgetManager: AppWidgetManager, appWidgetIds: IntArray) {
for (appWidgetId in appWidgetIds) {
updateAppWidget(context, appWidgetManager, appWidgetId)
}
}
}
internal fun updateAppWidget(context: Context, appWidgetManager: AppWidgetManager, appWidgetId: Int) {
val views = RemoteViews(context.packageName, R.layout.new_app_widget)
views.addView(R.id.listView, RemoteViews(context.packageName, R.layout.new_app_widget_list))
appWidgetManager.updateAppWidget(appWidgetId, views)
}

You should check offical documents.
https://developer.android.com/guide/topics/appwidgets#collections
You dont have to add programmatically.Add listview to layout from xml and set it with
remoteviews.setRemoteAdapter(R.id.yourlistview, intent)
Further information is available in upper link.