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class FactsViewModel
@Inject constructor(private val getRandomFactUseCase: GetRandomFactUseCase) : BaseViewModel() {
    companion object {
        const val FIRST_FACT = 0L
    }

    val fact = MutableLiveData<FactUi>()

    init {
        getFact(FIRST_FACT)

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class FactsFragment : BaseFragment<FragmentFactsBinding, FactsViewModel>() {

    // Bounce down animation distance
    private val halfScreenHeight: Float by lazy {
        context?.resources?.displayMetrics?.heightPixels?.div(2f)!!
    }

    private lateinit var springAnimation: SpringAnimation

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {

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abstract class BaseFragment<VB : ViewDataBinding, VM : BaseViewModel> : DaggerFragment() {

    abstract fun getViewModelClass(): Class<VM>
    abstract fun layoutId(): Int

    @Inject
    lateinit var viewModelFactory: ViewModelProvider.Factory

    protected lateinit var binding: VB
    protected lateinit var viewModel: VM

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class DateTimeHandler {
    fun currentEpochSecs(): Long = Instant.now(Clock.systemDefaultZone()).epochSecond
    fun currentLocalDate(): LocalDate = LocalDate.now(ZoneId.systemDefault())
    ...
}

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class GetAllConsumedSweetsUseCase(private val repo: ConsumedSweetsRepo) :
    SingleUseCase<List<ConsumedSweet>> {
    override fun execute(): Single<List<ConsumedSweet>> {
        return repo.getAllConsumedSweets()
    }
}

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data class ConsumedSweet(
    val id: Long = 0,
    val sweetId: Long,
    val g: Long,
    val date: Long,
    val sweet: Sweet)

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interface FactRepo {
    fun getRandomFact(currentFactId: Long): Single<Fact>
    fun downloadAllFactsAndSave(): Completable
}

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interface CompletableUseCaseWithParameter<P> {
    fun execute(parameter: P): Completable
}

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enum class MeasurementUnit {
    GRAM {
        override val ratioWithGrams: Int = 1
    },
    OUNCE {
        override val ratioWithGrams: Int = 28
    };

    abstract val ratioWithGrams: Int
}

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//Constructing the PagedList (in viewModel for example) 

private static final int INITIAL_LOAD_KEY = 0;
private static final int PAGE_SIZE = 15;
private static final int PREFETCH_DISTANCE = 5;

final MutableLiveData<PagedList<Item>> itemList = new MutableLiveData<>();

public void load(Executor uiExecutor, Executor threadPoolExecutor) {
        Box<Item> db = DataBase.getInstance(getContext());