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javaandroidtransformationandroid-livedataswitchmap

No instance(s) of type variable(s) Y exist so that Calendar conforms to LiveData<Y>

I want my LiveData<Calendar> instance to change everytime List of Alarms change. I have following code:

private LiveData<Calendar> nextAlarm;

public MyViewModel(@NonNull Application app) {

    nextAlarm = Transformations.switchMap(alarmRepo.getAlarms(), alarms -> {
        Calendar nearest = null;
        // ... some necessary computation here (iterating through alarms):
        // foreach alarms, find nearest one, create new Calendar according to day and time saved in database
        return nearest;
    });

Error I see:

No instance(s) of type variable(s) Y exist so that Calendar conforms

Can somebody help me out here? How can I return new Calendar instance in SwitchMapFunction?

to LiveData

Solution

  • I think you need use Transformation.map() function instead of Transformation.switchMap()