zipLiveData

inline fun <reified T : Any> zipLiveData(vararg liveItems: LiveData<*>): LiveData<List<T>> {	
    return MediatorLiveData<List<T>>().apply {	
        val zippedObjects = mutableListOf<T>()	
        liveItems.forEach {	
            addSource(it, { item ->	
                zippedObjects.add(item as T)	
                 if (zippedObjects.size == liveItems.size)	
                    value = zippedObjects	
            })	
        }	
    }	
}

public static LiveData<List> zipLiveData(LiveData... liveItems){
final List zippedObjects = new ArrayList<>();
final MediatorLiveData<List> mediator = new MediatorLiveData<>();
for(LiveData item: liveItems){
mediator.addSource(item, o -> {
zippedObjects.add(o);
if(zippedObjects.size() == liveItems.length){
mediator.setValue(zippedObjects);
}
});
}
return mediator;
}