BindingFragment

Create an base fragment as a application specific

• TweetListViewModel
• TimelineAdapter
• LoginState
• TweetListState

abstract class ATBaseFragment<VDB, VM>(resourceLayoutId: Int) : BindingFragment<VDB, VM>(resourceLayoutId)
        where  VDB : ViewDataBinding, VM : BindableViewModel<*, *> {

    override val activity by lazy { getActivity() as ATBaseActivity }
    override val application by lazy { activity.application }

    internal val navController by lazy { activity.navController }

    val loginViewModel: LoginViewModel by activityViewModels { LoginViewModelFactory(lifecycle) }

    override fun getBindingVariable() = BR.viewModel

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        if (requestCode == TwitterAuthConfig.DEFAULT_AUTH_REQUEST_CODE)
            twitterLogin?.onActivityResult(requestCode, resultCode, data)
    }

}

Extend application specific base fragment

@ExperimentalCoroutinesApi
@InternalCoroutinesApi
class TweetListFragment : ATBaseFragment<TweetListFragmentBinding, TweetListViewModel>(R.layout.tweet_list_fragment) {
    override val viewModel: TweetListViewModel by navGraphViewModels { TweetListViewModelFactory(lifecycle) }

    override fun initUserInterface(savedInstanceState: Bundle?) {
        viewDataBinding.adapter = TimelineAdapter() // if you prefer to use DataBoundRecyclerAdapter
        loginViewModel.stateLiveData.observe(viewLifecycleOwner, Observer { loginState : LoginState ->
            when (loginState) {
                is LoginState.UnAuthenticated -> findNavController().navigate(R.id.loginDialogFragment)
                is LoginState.Authenticated -> viewModel.postEvent(TweetListEvent.GetTweetList(loginState.user.id))
            }
        })
    }

    //region ***OPTIONAL*** UI action for NETWORK states. Loading progress, Empty message, etc...
    override fun onStateLoading(state: State.Loading) {
        showToast("Loading!!!!!")
        Log.i(viewTag, state.javaClass.simpleName)
    }

    override fun onStateEmpty(state: State.Empty) {
        showToast("Empty!!!!!")
        Log.i(viewTag, state.javaClass.simpleName)
    }

    override fun onStateSuccess(state: State.Success) {
        showToast("Success!!!!!")
        Log.i(viewTag, state.javaClass.simpleName)
    }
    //endregion
}