android-architecture-navigation

问题 The documentation discusses how to send simple integers and strings. For example: <argument android:name="myIntArg" android:defaultValue="255" app:argType="integer" /> In the origin Fragment: val action = OriginFragmentDirections.myAction(myInt) findNavController().navigate(action) In the destination Fragment: val receivedInt = DestinationFragmentArgs.fromBundle(arguments).myIntArg But say instead of myIntArg , I wanted to send a list of integers ( myIntListArg ). How would I do that? What

问题 I am using Navigation Component in my app , recently it was working correctly but after updating project to AndroidX I am getting error navigation destination DESTINATION_NAME is unknown to this NavController only if that destination(Which I'm going to open) is previously closed from itself using navController.popBackStack() . Also, There is no error if I close DESTINATION fragment from MainActivity , But Error only Occurs fragment is closed from itself using popBackStack . like below

问题 In my app, the user can select a category, then select an item within that category to finally view the item details. The standard/forward flow is: SelectCategoryFragment -> SelectItemFragment -> ViewItemDetailsFragment On selecting a category, the selectedCatId is passed via a Bundle from SelectCategoryFragment to SelectItemFragment : NavController navController = Navigation.findNavController(v); Bundle args = new Bundle(); args.putLong(SelectItemFragment.ARG_CATEGORY_ID, selectedCatId);

问题 So far I'm successfully able to navigate to dialogs and back using only navigation component. The problem is that, I have to do some stuff in dialog and return result to the fragment where dialog was called from. One way is to use shared viewmodel. But for that I have to use .of(activity) which leaves my app with a singleton taking up memory, even when I no longer need it. Another way is to override show(fragmentManager, id) method, get access to fragment manager and from it, access to

问题 So far I'm successfully able to navigate to dialogs and back using only navigation component. The problem is that, I have to do some stuff in dialog and return result to the fragment where dialog was called from. One way is to use shared viewmodel. But for that I have to use .of(activity) which leaves my app with a singleton taking up memory, even when I no longer need it. Another way is to override show(fragmentManager, id) method, get access to fragment manager and from it, access to

问题 Expected Create bottom app bar navigation using Navigation UI's BottomNavigationView and FragmentContainerView similar to the sample app NavigationAdavancedSample . Note, NavigationAndvancedSample app does not appear to use the same implementation as described in the documentation as it has a workaround implementation using the custom extension method setupWithNavController . Observed Null NavHostFragment when creating the BottomNavigationView in the MainActivity.kt with a

问题 Expected Create bottom app bar navigation using Navigation UI's BottomNavigationView and FragmentContainerView similar to the sample app NavigationAdavancedSample . Note, NavigationAndvancedSample app does not appear to use the same implementation as described in the documentation as it has a workaround implementation using the custom extension method setupWithNavController . Observed Null NavHostFragment when creating the BottomNavigationView in the MainActivity.kt with a

问题 I am trying to test the app workflow. The navigation component has been used to define the app workflow. Have used FragmentScenario for testing the navigation from one fragment to another based on this reference(https://developer.android.com/guide/navigation/navigation-testing). Have added the following dependency in build.gradle debugImplementation("androidx.fragment:fragment-testing:1.1.0-beta01") { exclude group: 'androidx.test', module: 'core' } for accessing the api

问题 What is the difference between animation tags in latest Navigation Architecture Component? I got confused with enterAnim & popEnterAnim . Similarly, exitAnim & popExitAnim . Any visual expansions is more than welcomed. 回答1: The Animate transitions between destinations documentation details the four types of animations: Entering a destination Exiting a destination Entering a destination via a pop action Exiting a destination via a pop action "Entering" refers to the destination that is coming

问题 I have my MainActivity setup which looks like this : <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".ui.host.HostActivity"> <fragment android:id="@+id/mainNavigationFragment" android:name="androidx.navigation.fragment.NavHostFragment" android