Error: Unable to instantiate fragment org.readium.r2.navigator.epub.EpubNavigatorFragment: could not find Fragment constructor

[paulocoutinhox]

Hi,

Im getting this error:

androidx.fragment.app.Fragment$InstantiationException: Unable to instantiate fragment org.readium.r2.navigator.epub.EpubNavigatorFragment: could not find Fragment constructor

When i try add the fragment in verison 3 of Readium.

childFragmentManager.commitNow {
    add(
        R.id.fragment_reader_container,
        EpubNavigatorFragment::class.java,
        Bundle(),
        navigatorFragmentTag,
    )
}

Log:

 Process: br.com.ubook.ubookapp, PID: 9549
 androidx.fragment.app.Fragment$InstantiationException: Unable to instantiate fragment org.readium.r2.navigator.epub.EpubNavigatorFragment: could not find Fragment constructor
 at androidx.fragment.app.Fragment.instantiate(Fragment.java:692)
 at androidx.fragment.app.FragmentContainer.instantiate(FragmentContainer.java:57)
 at androidx.fragment.app.FragmentManager$3.instantiate(FragmentManager.java:663)
 at androidx.fragment.app.FragmentTransaction.createFragment(FragmentTransaction.java:204)
 at androidx.fragment.app.FragmentTransaction.add(FragmentTransaction.java:267)
 at br.com.ubook.ubookapp.ui.fragment.ReaderReadium2Fragment$createAll$1.invokeSuspend(ReaderReadium2Fragment.kt:273)
 at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
 at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:100)
 at kotlinx.coroutines.internal.LimitedDispatcher$Worker.run(LimitedDispatcher.kt:113)
 at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:89)
 at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:586)
 at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:820)
 at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:717)
 at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:704)
 Suppressed: kotlinx.coroutines.internal.DiagnosticCoroutineContextException: [StandaloneCoroutine{Cancelling}@ba7c543, Dispatchers.IO]
 Caused by: java.lang.NoSuchMethodException: org.readium.r2.navigator.epub.EpubNavigatorFragment.<init> []
 at java.lang.Class.getConstructor0(Class.java:3395)
 at java.lang.Class.getConstructor(Class.java:2487)
 at androidx.fragment.app.Fragment.instantiate(Fragment.java:677)
 ... 13 more

Can you help me what im doing wrong?

Thanks.

[qnga]

Read the doc: https://github.com/readium/kotlin-toolkit/blob/develop/docs/guides/navigator/navigator.md

[paulocoutinhox]

Yes, i get from there:

childFragmentManager.commitNow {
                add(R.id.navigator_container, EpubNavigatorFragment::class.java, Bundle(), tag)
}

mine:

childFragmentManager.commitNow {
    add(
        R.id.fragment_reader_container,
        EpubNavigatorFragment::class.java,
        Bundle(),
        navigatorFragmentTag,
    )
}

[qnga]

kotlin-toolkit/docs/guides/navigator/navigator.md

Line 105 in 38b1a81

// You are responsible for creating/restoring the `NavigatorFactory`,

[paulocoutinhox]

@mickael-menu any tips?
i already using the documentation method, but im still get the error:

androidx.fragment.app.Fragment$InstantiationException: Unable to instantiate fragment org.readium.r2.navigator.epub.EpubNavigatorFragment: could not find Fragment constructor
 at androidx.fragment.app.Fragment.instantiate(Fragment.java:692)
 at androidx.fragment.app.FragmentContainer.instantiate(FragmentContainer.java:57)
 at androidx.fragment.app.FragmentManager$3.instantiate(FragmentManager.java:663)
 at androidx.fragment.app.FragmentTransaction.createFragment(FragmentTransaction.java:204)
 at androidx.fragment.app.FragmentTransaction.add(FragmentTransaction.java:267)
 at br.com.ubook.ubookapp.ui.fragment.ReaderReadium2Fragment$createAll$1$2$2.invokeSuspend(ReaderReadium2Fragment.kt:274)
 at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
 at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:100)
 at android.os.Handler.handleCallback(Handler.java:942)
 at android.os.Handler.dispatchMessage(Handler.java:99)
 at android.os.Looper.loopOnce(Looper.java:211)
 at android.os.Looper.loop(Looper.java:300)
 at android.app.ActivityThread.main(ActivityThread.java:8232)
 at java.lang.reflect.Method.invoke(Native Method)
 at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:580)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1028)
 Suppressed: kotlinx.coroutines.internal.DiagnosticCoroutineContextException: [StandaloneCoroutine{Cancelling}@f6c3d34, Dispatchers.IO]
 Caused by: java.lang.NoSuchMethodException: org.readium.r2.navigator.epub.EpubNavigatorFragment.<init> []
 at java.lang.Class.getConstructor0(Class.java:3395)
 at java.lang.Class.getConstructor(Class.java:2487)
 at androidx.fragment.app.Fragment.instantiate(Fragment.java:677)
 ... 15 more

[mickael-menu]

Did you add the EpubNavigatorFragment factory to your parent fragment? https://github.com/readium/kotlin-toolkit/blob/develop/docs/guides/navigator/navigator.md#epubnavigatorfragment

[paulocoutinhox]

Thanks!