Lazy ViewModel with Dagger2

BaseFragment.kt

// SpeakerFragment.kt
class SpeakerFragment : BaseFragment() {
    
    private val speakerViewModel by viewModel<SpeakerViewModel>()
}

// BaseFragment.kt
abstract class BaseFragment : DaggerFragment() {

    @Inject
    lateinit var viewModelFactory: ViewModelProvider.Factory

    protected inline fun <reified VM : ViewModel> viewModel(): Lazy<VM> =
        lazy { viewModelProvider<VM>(viewModelFactory) }

    protected inline fun <reified VM : ViewModel> activityViewModel(): Lazy<VM> =
        lazy { activityViewModelProvider<VM>(viewModelFactory) }

    protected inline fun <reified VM : ViewModel> parentViewModel(): Lazy<VM> =
        lazy { parentViewModelProvider<VM>(viewModelFactory) }
}

// Extensions.kt

/**
 * For Fragments, allows declarations like
 * ```
 * val myViewModel = viewModelProvider(myViewModelFactory)
 * ```
 */
inline fun <reified VM : ViewModel> Fragment.viewModelProvider(
    provider: ViewModelProvider.Factory
) = ViewModelProviders.of(this, provider).get(VM::class.java)

/**
 * Like [Fragment.viewModelProvider] for Fragments that want a [ViewModel] scoped to the Activity.
 */
inline fun <reified VM : ViewModel> Fragment.activityViewModelProvider(
    provider: ViewModelProvider.Factory
) = ViewModelProviders.of(requireActivity(), provider).get(VM::class.java)

/**
 * Like [Fragment.viewModelProvider] for Fragments that want a [ViewModel] scoped to the parent Fragment.
 */
inline fun <reified VM : ViewModel> Fragment.parentViewModelProvider(
    provider: ViewModelProvider.Factory
) = ViewModelProviders.of(requireParentFragment(), provider).get(VM::class.java)