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TakuSemba CyberAgent.Inc Single Activity with MVVM

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TakuSemba CyberAgent.Inc Single Activity with MVVM

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@takusemba https://github.com/TakuSemba

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https://developer.android.com/jetpack/docs/guide MVVM

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Navigation https://developer.android.com/guide/navigation/navigation-getting-started

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No content

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val navController = findNavController(R.id.host_fragment) // find from activity

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val navController = findNavController(R.id.host_fragment) // find from activity val navController = findNavController() // find from fragment

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val navController = findNavController(R.id.host_fragment) // find from activity val navController = findNavController() // find from fragment val navController = findNavController() // find from view

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val navController = findNavController(R.id.host_fragment) // find from activity val navController = findNavController() // find from fragment val navController = findNavController() // find from view val args = bundleOf(SecondFragment.KEY_USER_ID to userId) navController.navigate(R.id.toSecondFragment, args) // navigate to secondFragment.kt

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val navController = findNavController(R.id.host_fragment) // find from activity val navController = findNavController() // find from fragment val navController = findNavController() // find from view // navigate to secondFragment.kt val directions = FirstFragmentDirections.toSecondFragment(userId) navController.navigate(directions)

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val navController = findNavController(R.id.host_fragment) // find from activity val navController = findNavController() // find from fragment val navController = findNavController() // find from view // navigate to secondFragment.kt val directions = FirstFragmentDirections.toSecondFragment(userId) navController.navigate(directions) // get userId from arguments val args = SecondFragmentArgs.fromBundle(requireArguments()) val userId = args.userId

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val navController = findNavController(R.id.host_fragment) // find from activity val navController = findNavController() // find from fragment val navController = findNavController() // find from view // navigate to secondFragment.kt val directions = FirstFragmentDirections.toSecondFragment(userId) navController.navigate(directions) // get userId from arguments private val args by navArgs() val userId = args.userId

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Global Action a common action that multiple destinations can use

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Global Action a common action that multiple destinations can use ɾMaintenance ɾForceUpdate ɾError

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// global action

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// global action

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// navigate to maintainanceFragment using GlobalAction val directions = NavGraphDirections.actionGlobalMaintainanceFragment()

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// navigate to maintainanceFragment using GlobalAction val directions = NavGraphDirections.actionGlobalMaintainanceFragment() navController.navigate(directions)

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Nav Options special options for navigate actions public NavOptions.Builder setPopUpTo (int destinationId, boolean inclusive) public NavOptions.Builder setLaunchSingleTop (boolean singleTop) …

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// navigate with stacked fragmetns popoed up

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val directions = SplashDirections.showLoginFragment() navController.navigate(directions) // navigate with stacked fragmetns popoed up

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val directions = SplashDirections.showLoginFragment() val options = NavOptions.Builder() .setPopUpTo(R.id.splashFragment, true) .build() navController.navigate(directions, options) // navigate with stacked fragmetns popoed up

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// navigate to loginFragment val directions = SplashDirections.showLoginFragment() navController.navigate(directions) // navigate with stacked fragmetns popoed up

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// navigate as single-top val directions = NavGraphDirections.showBarFragment() navController.navigate(directions) val directionsAgain = NavGraphDirections.showBarFragment() navController.navigate(directionsAgain)

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val directions = NavGraphDirections.showBarFragment() navController.navigate(directions) val directionsAgain = NavGraphDirections.showBarFragment() val options = NavOptions.Builder() .setLaunchSingleTop(true) .build() navController.navigate(directions, options) // navigate as single-top

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// navigate to barFragment val directions = NavGraphDirections.showBarFragment() navController.navigate(directions) // navigate as single-top

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// navigate back

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navController.popBackStack() // navigate back

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navController.popBackStack() // navigate back // observe data override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) viewModel.user.observe(this) { user -> textView.text = user.name } }

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navController.popBackStack() // navigate back // observe data override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) viewModel.user.observe(this) { user -> textView.text = user.name } } observe(this) { user -> }

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navController.popBackStack() // navigate back // observe data override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) viewModel.user.observe(this) { user -> textView.text = user.name } } observe(this) { user -> } override fun onDestroy() { super.onDestroy() // not called yet }

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navController.popBackStack() // navigate back // observe data override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) viewModel.user.observe(viewLifecycleOwner) { user -> textView.text = user.name } } override fun onDestroy() { super.onDestroy() // not called yet } observe(viewLifecycleOwner) { user -> }

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navController.popBackStack() // navigate back // observe data override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) viewModel.user.observe(viewLifecycleOwner) { user -> textView.text = user.name } } override fun onDestroyView() { super.onDestroyView() // observer is removed. } observe(viewLifecycleOwner) { user -> }

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IUUQTNFEJVNDPN!UBLVTFNCB

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class FooViewModel : ViewModel() { val snackbarMessage: LiveData = MutableLiveData() } // viewModel

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class FooViewModel : ViewModel() { val snackbarMessage: LiveData = MutableLiveData() } // viewModel // observe data override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) viewModel.snackbarMessage.observe(viewLifecycleOwner) { message -> // show snackbar } }

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class FooViewModel : ViewModel() { val snackbarMessage: LiveData> = MutableLiveData() } // viewModel // observe data override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) viewModel.snackbarMessage.observe(viewLifecycleOwner) { message -> // show snackbar } }

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class FooViewModel : ViewModel() { val snackbarMessage: LiveData> = MutableLiveData() } // viewModel // observe data override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) viewModel.snackbarMessage.observe(viewLifecycleOwner) { message -> // show snackbar } } // Event.kt from https://github.com/google/iosched LiveData>

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class FooViewModel : ViewModel() { // Event.kt from https://github.com/google/iosched val snackbarMessage: LiveData> = MutableLiveData() } // viewModel // observe data override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) viewModel.snackbarMessage.observe(viewLifecycleOwner) { event -> event.getContentIfNotHandled()?.let { message -> // show snackbar } } }

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IUUQTNFEJVNDPNBOESPJEEFWFMPQFSTMJWFEBUBXJUITOBDLCBSOBWJHBUJPOBOEPUIFSFWFOUTUIF TJOHMFMJWFFWFOUDBTFBD

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// scope for viewModel val activityScopedViewModel = ViewModelProviders .of(requireActivity(), viewModelFactory) .get(FooViewModel::class.java)

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// scope for viewModel private val activityScopedViewModel: FooViewModel by activityViewModels { viewModelFactory }

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// scope for viewModel private val activityScopedViewModel: FooViewModel by activityViewModels { viewModelFactory } Activity Scope

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// scope for viewModel private val activityScopedViewModel: FooViewModel by activityViewModels { viewModelFactory } Activity Scope ≒ App Scope

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// scope for viewModel private val activityScopedViewModel: FooViewModel by activityViewModels { viewModelFactory } private val fragmentScopedViewModel: BarViewModel by viewModels { viewModelFactory } Activity Scope ≒ App Scope

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// scope for viewModel private val activityScopedViewModel: FooViewModel by activityViewModels { viewModelFactory } private val fragmentScopedViewModel: BarViewModel by viewModels { viewModelFactory } Activity Scope ≒ App Scope … Fragment Scope Fragment Scope

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https://www.youtube.com/watch?v=2k8x8V77CrU&t=1300s

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https://github.com/takusemba https://twitter.com/takusemba Single Activity with MVVM