BaseFragment.kt

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

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        viewModel = ViewModelProviders.of(this, viewModelFactory)[getViewModelClass()]
        observe(viewModel.errorMessage) { it ->
            it.getContentIfNotHandled()?.let {
                (activity as BaseActivity).alert(it.messageStringRes)
            }
        }
    }

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View {
        val view = inflater.inflate(layoutId(), container, false)
        binding = DataBindingUtil.bind(view)!!
        binding.setLifecycleOwner(this)
        return view
    }

    fun navController() = findNavController(view!!)
}