Conditional navigation with Navigation Component & View Model | Sharing Data using View Model
Conditional navigation with navigation component and View Model
Sharing Data between fragments using View Model
def nav_version = "2.3.5"
// Java language implementation
implementation "androidx.navigation:navigation-fragment:$nav_version"
implementation "androidx.navigation:navigation-ui:$nav_version"
def lifecycle_version = "2.3.1"
// ViewModel
implementation "androidx.lifecycle:lifecycle-viewmodel:$lifecycle_version"
// LiveData
implementation "androidx.lifecycle:lifecycle-livedata:$lifecycle_version"
1) navigation component with ProfileFragment, LoginFragment and HomeFragment,
2) Connect navigation component with Activity
< androidx.fragment.app.FragmentContainerView
android:id="@+id/nav_host_fragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:name="androidx.navigation.fragment.NavHostFragment"
app:defaultNavHost="true"
app:navGraph="@navigation/nav_graph" />
3) create action from HomeFragment to ProfileFragment and ProfileFragment to LoginFragment
Navigation.findNavController(view).navigate(R.id.action);
4) Create ViewModel class with field String (Username)
5) inside ProfileFragment make sure User has visited LoginFragment and Username set with ViewModel
UserViewModel viewModel = ViewModelProviders.of(owner).get(UserViewModel.class);
viewModel.getUserName().observe(...);
6) Get Value of Username from ViewModel inside ProfileFragment
7) inside LoginFragment when Username in ViewModel and also popBackStack() to navigate on ProfileFragmentBack
NavHostFragment.findNavController(this).popBackStack();
8) Run and test the output
#navigation #android #coding #component #viewmodel #datasharing
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