showLiveActivity method
Post or update an Android live ongoing notification (the Android equivalent
of an iOS Live Activity). Uses a promoted Live Update (ProgressStyle) on
Android 16+, a normal ongoing notification with a progress bar otherwise.
Returns true if shown.
Implementation
Future<bool> showLiveActivity({
required int id,
required String channelId,
required String channelName,
String? title,
String? body,
String? subText,
int? progress, // 0..100, null = no bar
bool indeterminate = false,
bool ongoing = true,
String? payload,
}) async => false;