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Example of a MediatorLiveData class to handle two LiveDatas at once.
import androidx.lifecycle.LiveData
import androidx.lifecycle.MediatorLiveData
// This class ia a MediatorLiveData created since I have two different sources of data:
// - subjects table
// - reminders table
// Since they then become two separate LiveData, and I need both to fill in the data
// on the main RecyclerView, then we're using a MediatorLiveData to grab both LiveData
// and add them as sources, so that we can notify observers when any of the data gets
// updated.
class CombinedSubjectReminders(
ldSubject: LiveData<List<Subject>>,
ldReminder: LiveData<List<Reminder>>
) : MediatorLiveData<Pair<List<Subject>, List<Reminder>>>() {
private var listSubject: List<Subject> = emptyList()
private var listReminder: List<Reminder> = emptyList()
init {
value = Pair(listSubject, listReminder)
addSource(ldSubject) {
if( it != null ) listSubject = it
value = Pair(listSubject, listReminder)
}
addSource(ldReminder) {
if( it != null ) listReminder = it
value = Pair(listSubject, listReminder)
}
}
}
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