Fragment Not Associated With A Fragment Manager

Question

I am writing some instrumented tests for an app with one activity and multiple fragments using the Navigation Component.

The code for my splash screen is as below:

class SplashFragment : Fragment(), KodeinAware {      override val kodein by Admin.instance.kodein      private var realm: Realm? = null      override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {         return inflater.inflate(R.layout.splash, container, false)     }      override fun onViewCreated(view: View, savedInstanceState: Bundle?) {         super.onViewCreated(view, savedInstanceState)          (activity as? AppCompatActivity)?.supportActionBar?.hide()          realm = Realm.getInstance(RealmUtil.realmConfig)          val result = realm!!.where<User>().findFirst()         val user = if (result != null) realm!!.copyFromRealm(result) else null          Handler().postDelayed({             if (user == null)                 findNavController().navigate(R.id.action_splashFragment_to_loginFragment) //navigate to login screen if no user exists             else                 findNavController().navigate(R.id.action_splashFragment_to_businessListFragment) //navigate to business list if user already logged in         }, 2000)     }      override fun onDestroy() {         super.onDestroy()          realm?.close()     } } 

I am attempting to test a fragment that comes after the splash screen but I keep getting the following error:

java.lang.IllegalStateException: Fragment SplashFragment{a1ca381 (5f5b98ae-c130-4e9b-9b77-0495561ef4f5)} not associated with a fragment manager. at androidx.fragment.app.Fragment.requireFragmentManager(Fragment.java:891) at androidx.navigation.fragment.NavHostFragment.findNavController(NavHostFragment.java:106) at androidx.navigation.fragment.FragmentKt.findNavController(Fragment.kt:29) at com.chargebot.collect.admin.fragment.onboarding.SplashFragment$onViewCreated$1.run(SplashFragment.kt:44) at android.os.Handler.handleCallback(Handler.java:873) at android.os.Handler.dispatchMessage(Handler.java:99) at androidx.test.espresso.base.Interrogator.loopAndInterrogate(Interrogator.java:148) at androidx.test.espresso.base.UiControllerImpl.loopUntil(UiControllerImpl.java:519) at androidx.test.espresso.base.UiControllerImpl.loopUntil(UiControllerImpl.java:478) at androidx.test.espresso.base.UiControllerImpl.injectKeyEvent(UiControllerImpl.java:201) at androidx.test.espresso.base.UiControllerImpl.injectString(UiControllerImpl.java:357) at androidx.test.espresso.action.TypeTextAction.perform(TypeTextAction.java:108) at androidx.test.espresso.ViewInteraction$SingleExecutionViewAction.perform(ViewInteraction.java:360) at androidx.test.espresso.ViewInteraction.doPerform(ViewInteraction.java:251) at androidx.test.espresso.ViewInteraction.access$100(ViewInteraction.java:64) at androidx.test.espresso.ViewInteraction$1.call(ViewInteraction.java:157) at androidx.test.espresso.ViewInteraction$1.call(ViewInteraction.java:154) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at android.os.Handler.handleCallback(Handler.java:873) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:193) at android.app.ActivityThread.main(ActivityThread.java:6669) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858) 

My test class is as follows:

@RunWith(AndroidJUnit4::class) @MediumTest class SignInTest {      @get: Rule     val login = ActivityScenarioRule(Home::class.java)      @Test     fun loginWithoutEmail_ShouldDisplayError() {         val scenario = launchFragmentInContainer<LoginFragment>()          onView(withId(R.id.password)).perform(typeText("samplePassword"), closeSoftKeyboard())         onView(withId(R.id.login)).perform(click())          onView(withId(com.google.android.material.R.id.snackbar_text)).check(matches(withText(R.string.enter_email)))     }      @Test     fun loginWithoutPassword_ShouldDisplayError() {         val scenario = launchFragmentInContainer<LoginFragment>()          onView(withId(R.id.email)).perform(typeText("[email protected]"), closeSoftKeyboard())         onView(withId(R.id.login)).perform(click())          onView(withId(com.google.android.material.R.id.snackbar_text)).check(matches(withText(R.string.enter_password)))     } } 

None of my test functions will execute because of the aforementioned error. What's the cause of the exception since tests I run on the Splash screen run successfully?

My nav_graph is as below:

<?xml version="1.0" encoding="utf-8"?> <navigation 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:id="@+id/nav_graph"     app:startDestination="@id/splashFragment">      <fragment         android:id="@+id/splashFragment"         android:name="com.chargebot.collect.admin.fragment.onboarding.SplashFragment"         android:label="SplashFragment"         tools:layout="@layout/splash">         <action             android:id="@+id/action_splashFragment_to_loginFragment"             app:destination="@id/loginFragment"             app:popUpTo="@+id/splashFragment"             app:popUpToInclusive="true" />         <action             android:id="@+id/action_splashFragment_to_businessListFragment"             app:destination="@id/businessListFragment"             app:popUpTo="@+id/splashFragment"             app:popUpToInclusive="true" />     </fragment>     <fragment         android:id="@+id/registrationFragment"         android:name="com.chargebot.collect.admin.fragment.onboarding.RegistrationFragment"         android:label="RegistrationFragment"         tools:layout="@layout/registration">         <action             android:id="@+id/action_registrationFragment_to_businessListFragment"             app:destination="@id/businessListFragment"             app:popUpTo="@+id/registrationFragment"             app:popUpToInclusive="true" />         <action             android:id="@+id/action_registrationFragment_to_loginFragment"             app:destination="@id/loginFragment"             app:popUpTo="@+id/registrationFragment"             app:popUpToInclusive="true" />     </fragment>     <fragment         android:id="@+id/loginFragment"         android:name="com.chargebot.collect.admin.fragment.onboarding.LoginFragment"         android:label="LoginFragment"         tools:layout="@layout/login">         <action             android:id="@+id/action_loginFragment_to_businessListFragment"             app:destination="@id/businessListFragment"             app:popUpTo="@+id/loginFragment"             app:popUpToInclusive="true" />         <action             android:id="@+id/action_loginFragment_to_registrationFragment"             app:destination="@id/registrationFragment"             app:popUpTo="@+id/loginFragment"             app:popUpToInclusive="true" />     </fragment>     <fragment         android:id="@+id/businessListFragment"         android:name="com.chargebot.collect.admin.fragment.business.BusinessListFragment"         android:label="BusinessListFragment"         tools:layout="@layout/businesses_list">         <action             android:id="@+id/action_businessListFragment_to_newBusinessFragment"             app:destination="@id/newBusinessFragment" />         <action             android:id="@+id/action_businessListFragment_to_branchesFragment"             app:destination="@id/branchesFragment" />     </fragment>     <fragment         android:id="@+id/newBusinessFragment"         android:name="com.chargebot.collect.admin.fragment.business.NewBusinessFragment"         android:label="NewBusinessFragment"         tools:layout="@layout/add_business_layout">         <action             android:id="@+id/action_newBusinessFragment_to_businessListFragment"             app:destination="@id/businessListFragment" />     </fragment>     <fragment         android:id="@+id/branchesFragment"         android:name="com.chargebot.collect.admin.fragment.branch.BranchesFragment"         android:label="BranchesFragment"         tools:layout="@layout/branches_layout">         <action             android:id="@+id/action_branchesFragment_to_transactionsFragment"             app:destination="@id/transactionsFragment" />         <action             android:id="@+id/action_branchesFragment_to_newBranchFragment"             app:destination="@id/newBranchFragment" />         <action             android:id="@+id/action_branchesFragment_to_collectorsFragment"             app:destination="@id/collectorsFragment" />     </fragment>     <fragment         android:id="@+id/transactionsFragment"         android:name="com.chargebot.collect.admin.fragment.transactions.TransactionsFragment"         android:label="TransactionsFragment"         tools:layout="@layout/transactions" />     <fragment         android:id="@+id/newBranchFragment"         android:name="com.chargebot.collect.admin.fragment.branch.NewBranchFragment"         android:label="NewBranchFragment"         tools:layout="@layout/add_branch_layout" />     <fragment         android:id="@+id/collectorsFragment"         android:name="com.chargebot.collect.admin.fragment.collector.CollectorsFragment"         android:label="CollectorsFragment"         tools:layout="@layout/client_list_layout">         <action             android:id="@+id/action_collectorsFragment_to_newCollectorFragment"             app:destination="@id/newCollectorFragment" />         <action             android:id="@+id/action_collectorsFragment_to_transactionsFragment"             app:destination="@id/transactionsFragment" />         <action             android:id="@+id/action_collectorsFragment_to_collectorTransactions"             app:destination="@id/collectorTransactions" />     </fragment>     <fragment         android:id="@+id/newCollectorFragment"         android:name="com.chargebot.collect.admin.fragment.collector.NewCollectorFragment"         android:label="NewCollectorFragment"         tools:layout="@layout/new_client_layout" />     <fragment         android:id="@+id/collectorTransactions"         android:name="com.chargebot.collect.admin.fragment.transactions.CollectorTransactionsFragment"         android:label="CollectorTransactions"         tools:layout="@layout/transaction_layout">         <action             android:id="@+id/action_collectorTransactions_to_collectorsFragment"             app:destination="@id/collectorsFragment"             app:popUpTo="@id/collectorsFragment" />     </fragment>  </navigation> 

Answer 1

I found out that in my case the issue was related to threading. I solved it with:

 lifecycleScope.launchWhenResumed {       findNavController().navigate(R.id.action_splashFragment_to_loginFragment)  } 

Would be good to know if this help you?!