android - fragment 不与 fragment 管理器相关联

Question

我正在使用 Navigation Component 为具有一个 Activity 和多个 fragment 的应用程序编写一些仪器测试。

我的启动画面代码如下:

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()
    }
}

我正在尝试测试启动画面之后出现的 fragment ，但我不断收到以下错误:

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)

我的测试类如下:

@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("sample@password.com"), 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)))
    }
}

由于上述错误，我的所有测试函数都不会执行。自从我在初始屏幕上运行的测试成功运行后出现异常的原因是什么？

我的nav_graph如下:

<?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

我发现在我的案例中，问题与线程有关。我解决了它:

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

很高兴知道这是否对您有帮助？!