Develop Reference

Not navigate to fragment with #Inject constructor

I'm trying to create a simple news app, but when I used of #Inject constructor in my fragment, the navigation component not worked and show the below error... while, before used injection, it's worked without any problem
what I doing to fix this error?! thank you so much for your help
NewsActivity:
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.navigation.fragment.findNavController
import androidx.navigation.ui.setupWithNavController
import com.example.simplenewsapp.R
import dagger.hilt.android.AndroidEntryPoint
import kotlinx.android.synthetic.main.activity_news.*
#AndroidEntryPoint
class NewsActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_news)
bottomNavigationView.setupWithNavController(newsNavHostFragment.findNavController())
}
}
BreakingNewsFragment:
class BreakingNewsFragment #Inject constructor(
val newsItemAdapter: NewsAdapter,
var viewModel: MainViewModel? = null
) : Fragment(R.layout.fragment_breaking_news) {
...
}
Error message:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.simplenewsapp, PID: 8558
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.simplenewsapp/com.example.simplenewsapp.ui.NewsActivity}: android.view.InflateException: Binary XML file line #17: Binary XML file line #17: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2913)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: android.view.InflateException: Binary XML file line #17: Binary XML file line #17: Error inflating class fragment
Caused by: android.view.InflateException: Binary XML file line #17: Error inflating class fragment
Caused by: androidx.fragment.app.Fragment$InstantiationException: Unable to instantiate fragment com.example.simplenewsapp.ui.fragments.BreakingNewsFragment: could not find Fragment constructor
at androidx.fragment.app.Fragment.instantiate(Fragment.java:625)
at androidx.fragment.app.FragmentContainer.instantiate(FragmentContainer.java:57)
at androidx.fragment.app.FragmentManager$3.instantiate(FragmentManager.java:483)
at androidx.navigation.fragment.FragmentNavigator.instantiateFragment(FragmentNavigator.java:132)
at androidx.navigation.fragment.FragmentNavigator.navigate(FragmentNavigator.java:162)
at androidx.navigation.fragment.FragmentNavigator.navigate(FragmentNavigator.java:58)
at androidx.navigation.NavGraphNavigator.navigate(NavGraphNavigator.java:71)
at androidx.navigation.NavGraphNavigator.navigate(NavGraphNavigator.java:28)
at androidx.navigation.NavController.navigate(NavController.java:1059)
at androidx.navigation.NavController.onGraphCreated(NavController.java:639)
at androidx.navigation.NavController.setGraph(NavController.java:592)
at androidx.navigation.NavController.setGraph(NavController.java:557)
at androidx.navigation.NavController.setGraph(NavController.java:539)
at androidx.navigation.fragment.NavHostFragment.onCreate(NavHostFragment.java:248)
at androidx.fragment.app.Fragment.performCreate(Fragment.java:2936)
at androidx.fragment.app.FragmentStateManager.create(FragmentStateManager.java:472)
at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:278)
at androidx.fragment.app.FragmentLayoutInflaterFactory.onCreateView(FragmentLayoutInflaterFactory.java:141)
at androidx.fragment.app.FragmentController.onCreateView(FragmentController.java:135)
at androidx.fragment.app.FragmentActivity.dispatchFragmentsOnCreateView(FragmentActivity.java:313)
at androidx.fragment.app.FragmentActivity.onCreateView(FragmentActivity.java:292)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:780)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:863)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:866)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374) E/AndroidRuntime: at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:696)
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:170)
at com.example.simplenewsapp.ui.NewsActivity.onCreate(NewsActivity.kt:26)
at android.app.Activity.performCreate(Activity.java:7136)
at android.app.Activity.performCreate(Activity.java:7127)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
at android.os.Handler.dispatchMessage(Handler.java:106)
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)
Caused by: java.lang.NoSuchMethodException: <init> []
at java.lang.Class.getConstructor0(Class.java:2327)
at java.lang.Class.getConstructor(Class.java:1725)
at androidx.fragment.app.Fragment.instantiate(Fragment.java:610)
... 47 more
at
com.example.simplenewsapp.ui.NewsActivity.onCreate(NewsActivity.kt:26)
is:
setContentView(R.layout.activity_news)

All the provided answers are wrong as fragments constructor do NOT have to be empty! You can easily constructor inject your dependencies inside your fragments, but you have to use a fragment factory in order to do so.
Here is an example for you:
Fragment
#AndroidEntryPoint
class BreakingNewsFragment(
val newsItemAdapter: NewsAdapter,
) : Fragment(R.layout.fragment_breaking_news) {
...
}
Fragment Factory
class MainFragmentFactory #Inject constructor(
private val newsAdapter: NewsAdapter
// your dependencies
) : FragmentFactory() {
override fun instantiate(classLoader: ClassLoader, className: String): Fragment = when(className) {
BreakingNewsFragment::class.java.name -> BreakingNewsFragment(newsAdapter)
// here you can add every other fragment
else -> super.instantiate(classLoader, className)
}
}
MainNavHostFragment
#AndroidEntryPoint
class MainNavHostFragment : NavHostFragment() {
#Inject lateinit var mainFragmentFactory: MainFragmentFactory
override fun onAttach(context: Context) {
super.onAttach(context)
childFragmentManager.fragmentFactory = mainFragmentFactory
}
}
Then in order to use your new NavHostFragment, you have to change your activity_main.xml
Activity_main.xml
<fragment
android:id="#+id/fragment_container"
android:name="yourPath.MainNavHostFragment"
android:layout_width="match_parent"
android:layout_height="0dp"
app:defaultNavHost="true"
app:navGraph="#navigation/nav_main" />
The important line being here "android:name="yourPath.MainNavHostFragment" or for example "android:name="com.example.app.ui.MainNavHostFragment"
With this you can constructor inject inside your fragment.
NOTE:
You can NOT constructor inject your viewmodel! You should also be careful with using this method and constructor injecting adapters as they can possibility cause a memory leak. With adapters, I would advise you to field inject them

Fragments should have an empty constructor since they are managed by Android, same as activities. Anything you want to inject you have to inject inside the fragment, not through the constructor.
For view-models, it's trivial through the viewModels() API:
private val viewModel: MainViewModel by viewModels()
Don't forget to annotate the fragment with #AndroidEntryPoint and the view-model with #HiltViewModel.

Add #AndroidEntryPoint to your fragment and initialize NewsAdapter() in onViewCreated method of fragments.
Get MainViewModel by using
private val MainViewModel by viewModels()
Fragments MUST have an empty constructor since they are created by System OS.

how to scope the SharedViewModel after migrating an existing app to use the Navigation component

I've been struggling on this the whole day and still can't make it work. In an existing Single Activity app, I'm trying to replace all fragment transactions by implementing the Navigation component.
I've already created a Navigation graph and included the FragmentContainerView as a child of the root ViewGroup as it was proposed in the official docs.
activity_main.xml
<FrameLayout
android:id="#+id/container"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/appBarLayout">
<androidx.fragment.app.FragmentContainerView
android:id="#+id/main_content"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="0dp"
app:defaultNavHost="true"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/appBarLayout"
app:navGraph="#navigation/nav_graph" />
</FrameLayout>
Now the problem that I'm currently facing is that the SharedViewModel which I am using through the whole app can't be instantiated in the BaseFragment anymore.
BaseFragment.kt
abstract class BaseFragment<E : ViewDataBinding, T : BaseViewModel> : Fragment() {
lateinit var viewModel: T
lateinit var dataBinding: E
abstract fun getLayoutResource(): Int
abstract fun getViewModelClass(): Class<T>
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
activity?.let {
// java.lang.RuntimeException: Cannot create an instance of class SharedViewModel
viewModel = ViewModelProvider(it).get(getViewModelClass())
// viewModel = ViewModelProvider(getParentFragment()).get(getViewModelClass()) also doesn't work
}
}
...
}
BaseViewModel.kt
abstract class BaseViewModel : ViewModel(), LifecycleObserver
SharedViewModel.kt
abstract class SharedViewModel : BaseViewModel() {
...
}
SharedViewModelImpl.kt
class SharedViewModelImpl(private val repository: AppRepository) : SharedViewModel(){
...
}
I've read posts on SO and as well as Medium articles that recommend creating the SharedViewModel by using by navGraphViewModels like this
val viewModel: SharedViewModel by navGraphViewModels(R.id.navigation_graph)
but it seems that I still can't combine this approach with the generics that I already have.
My assumption is that the Navigation component can't deal with abstract classes.
How can I overcome this problem by keeping my existing app architecture? Many thanks in advance.
UPDATE:
#ianhanniballake asked me to post the entire stack trace. So here it is:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: at.bwappsandmore.doitagain, PID: 13528
java.lang.RuntimeException: Unable to start activity ComponentInfo{at.bwappsandmore.doitagain/at.bwappsandmore.doitagain.ui.MainActivity}: android.view.InflateException: Binary XML file line #44: Binary XML file line #44: Error inflating class androidx.fragment.app.FragmentContainerView
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2913)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: android.view.InflateException: Binary XML file line #44: Binary XML file line #44: Error inflating class androidx.fragment.app.FragmentContainerView
Caused by: android.view.InflateException: Binary XML file line #44: Error inflating class androidx.fragment.app.FragmentContainerView
Caused by: java.lang.RuntimeException: Cannot create an instance of class at.bwappsandmore.doitagain.viewModel.SharedViewModel
at androidx.lifecycle.ViewModelProvider$NewInstanceFactory.create(ViewModelProvider.java:221)
at androidx.lifecycle.ViewModelProvider$AndroidViewModelFactory.create(ViewModelProvider.java:278)
at androidx.lifecycle.SavedStateViewModelFactory.create(SavedStateViewModelFactory.java:106)
at androidx.lifecycle.ViewModelProvider.get(ViewModelProvider.java:185)
at androidx.lifecycle.ViewModelProvider.get(ViewModelProvider.java:150)
at at.bwappsandmore.doitagain.base.BaseFragment.onCreate(BaseFragment.kt:31)
at at.bwappsandmore.doitagain.ui.DisplayDataFragment.onCreate(DisplayDataFragment.kt:85)
at androidx.fragment.app.Fragment.performCreate(Fragment.java:2684)
at androidx.fragment.app.FragmentStateManager.create(FragmentStateManager.java:280)
at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1175)
at androidx.fragment.app.FragmentManager.addAddedFragments(FragmentManager.java:2224)
at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:1997)
at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:1953)
at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:1849)
at androidx.fragment.app.FragmentManager.dispatchStateChange(FragmentManager.java:2629)
at androidx.fragment.app.FragmentManager.dispatchCreate(FragmentManager.java:2571)
at androidx.fragment.app.Fragment.onCreate(Fragment.java:1685)
at androidx.navigation.fragment.NavHostFragment.onCreate(NavHostFragment.java:264)
at androidx.fragment.app.Fragment.performCreate(Fragment.java:2684)
at androidx.fragment.app.FragmentStateManager.create(FragmentStateManager.java:280)
at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1175)
at androidx.fragment.app.FragmentManager.addAddedFragments(FragmentManager.java:2224)
at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:1997)
at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:1953)
at androidx.fragment.app.FragmentManager.execSingleAction(FragmentManager.java:1818)
at androidx.fragment.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:303)
at androidx.fragment.app.FragmentContainerView.<init>(FragmentContainerView.java:166)
E/AndroidRuntime: at androidx.fragment.app.FragmentLayoutInflaterFactory.onCreateView(FragmentLayoutInflaterFactory.java:51)
at androidx.fragment.app.FragmentController.onCreateView(FragmentController.java:135)
at androidx.fragment.app.FragmentActivity.dispatchFragmentsOnCreateView(FragmentActivity.java:356)
at androidx.fragment.app.FragmentActivity.onCreateView(FragmentActivity.java:335)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:780)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:863)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:866)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:696)
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:170)
at androidx.databinding.DataBindingUtil.setContentView(DataBindingUtil.java:303)
at androidx.databinding.DataBindingUtil.setContentView(DataBindingUtil.java:284)
at at.bwappsandmore.doitagain.base.BaseActivity.onCreate(BaseActivity.kt:27)
at at.bwappsandmore.doitagain.ui.MainActivity.onCreate(MainActivity.kt:46)
at android.app.Activity.performCreate(Activity.java:7136)
at android.app.Activity.performCreate(Activity.java:7127)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: java.lang.InstantiationException: java.lang.Class<at.bwappsandmore.doitagain.viewModel.SharedViewModel> cannot be instantiated
at java.lang.Class.newInstance(Native Method)
at androidx.lifecycle.ViewModelProvider$NewInstanceFactory.create(ViewModelProvider.java:219)
... 60 more

Android app error android.view.InflateException. With Jetpack Navigation Component

trying to make app that use Naviagtion Components with two simple screens managed with Navigation Graph, one of witch is:
MainFragment:
public class MainFragment extends Fragment {
private MainViewModel mViewModel;
public static MainFragment newInstance() {
return new MainFragment();
}
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container,
#Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.main_fragment, container, false);
}
#Override
public void onActivityCreated(#Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
mViewModel = new ViewModelProvider(this).get(MainViewModel.class);
Button button = getView().findViewById(R.id.button);
button.setOnClickListener(Navigation.createNavigateOnClickListener(R.id.mainToSecond,null));
// TODO: Use the ViewModel
}
}
And 2nd screen:
public class SecondFragment extends Fragment {
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
void onFragmentInteraction(Uri uri);
}
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
public SecondFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* #param param1 Parameter 1.
* #param param2 Parameter 2.
* #return A new instance of fragment SecondFragment.
*/
// TODO: Rename and change types and number of parameters
public static SecondFragment newInstance(String param1, String param2) {
SecondFragment fragment = new SecondFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_second, container, false);
}
}
My "Navigation Host" is MainActivity class:
public class MainActivity extends AppCompatActivity implements
SecondFragment.OnFragmentInteractionListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
}
#Override
public void onFragmentInteraction(Uri uri){}}
While running up on emulator, Gradle showing no erros but app doesn't launch.
Here's error that I've got.
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.navigationdemo/com.example.navigationdemo.ui.main.MainActivity}: android.view.InflateException: Binary XML file line #10
main_activity XML code:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ui.main.MainActivity" >
<fragment
android:id="#+id/demo_nav_host_fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:defaultNavHost="true"
app:navGraph="#navigation/navigation_graph"/>
Full exception:
Process: com.example.navigationdemo, PID: 13360
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.navigationdemo/com.example.navigationdemo.ui.main.MainActivity}: android.view.InflateException: Binary XML file line #11 in com.example.navigationdemo:layout/main_activity: Binary XML file line #11 in com.example.navigationdemo:layout/main_activity: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3270)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
Caused by: android.view.InflateException: Binary XML file line #11 in com.example.navigationdemo:layout/main_activity: Binary XML file line #11 in com.example.navigationdemo:layout/main_activity: Error inflating class fragment
Caused by: android.view.InflateException: Binary XML file line #11 in com.example.navigationdemo:layout/main_activity: Error inflating class fragment
Caused by: java.lang.IllegalStateException: Fragment class was not set
at androidx.navigation.fragment.FragmentNavigator$Destination.getClassName(FragmentNavigator.java:322)
at androidx.navigation.fragment.FragmentNavigator.navigate(FragmentNavigator.java:158)
at androidx.navigation.fragment.FragmentNavigator.navigate(FragmentNavigator.java:58)
at androidx.navigation.NavGraphNavigator.navigate(NavGraphNavigator.java:71)
at androidx.navigation.NavGraphNavigator.navigate(NavGraphNavigator.java:28)
at androidx.navigation.NavController.navigate(NavController.java:1049)
at androidx.navigation.NavController.onGraphCreated(NavController.java:633)
at androidx.navigation.NavController.setGraph(NavController.java:586)
at androidx.navigation.NavController.setGraph(NavController.java:551)
at androidx.navigation.NavController.setGraph(NavController.java:533)
at androidx.navigation.fragment.NavHostFragment.onCreate(NavHostFragment.java:238)
at androidx.fragment.app.Fragment.performCreate(Fragment.java:2684)
at androidx.fragment.app.FragmentStateManager.create(FragmentStateManager.java:280)
at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1175)
at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1356)
at androidx.fragment.app.FragmentLayoutInflaterFactory.onCreateView(FragmentLayoutInflaterFactory.java:109)
at androidx.fragment.app.FragmentController.onCreateView(FragmentController.java:135)
at androidx.fragment.app.FragmentActivity.dispatchFragmentsOnCreateView(FragmentActivity.java:356)
at androidx.fragment.app.FragmentActivity.onCreateView(FragmentActivity.java:335)
at android.view.LayoutInflater.tryCreateView(LayoutInflater.java:1069)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:997)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:961)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:1123)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1084)
at android.view.LayoutInflater.inflate(LayoutInflater.java:682)
at android.view.LayoutInflater.inflate(LayoutInflater.java:534)
at android.view.LayoutInflater.inflate(LayoutInflater.java:481)
at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:696)
E/AndroidRuntime: at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:170)
at com.example.navigationdemo.ui.main.MainActivity.onCreate(MainActivity.java:15)
at android.app.Activity.performCreate(Activity.java:7802)
at android.app.Activity.performCreate(Activity.java:7791)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1299)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3245)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
Full exception when using
<androidx.fragment.app.FragmentContainerView
Process: com.example.navigationdemo, PID: 12977
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.navigationdemo/com.example.navigationdemo.ui.main.MainActivity}: android.view.InflateException: Binary XML file line #11 in com.example.navigationdemo:layout/main_activity: Binary XML file line #11 in com.example.navigationdemo:layout/main_activity: Error inflating class androidx.fragment.app.FragmentContainerView
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3270)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
Caused by: android.view.InflateException: Binary XML file line #11 in com.example.navigationdemo:layout/main_activity: Binary XML file line #11 in com.example.navigationdemo:layout/main_activity: Error inflating class androidx.fragment.app.FragmentContainerView
Caused by: android.view.InflateException: Binary XML file line #11 in com.example.navigationdemo:layout/main_activity: Error inflating class androidx.fragment.app.FragmentContainerView
Caused by: java.lang.IllegalStateException: Fragment class was not set
at androidx.navigation.fragment.FragmentNavigator$Destination.getClassName(FragmentNavigator.java:322)
at androidx.navigation.fragment.FragmentNavigator.navigate(FragmentNavigator.java:158)
at androidx.navigation.fragment.FragmentNavigator.navigate(FragmentNavigator.java:58)
at androidx.navigation.NavGraphNavigator.navigate(NavGraphNavigator.java:71)
at androidx.navigation.NavGraphNavigator.navigate(NavGraphNavigator.java:28)
at androidx.navigation.NavController.navigate(NavController.java:1049)
at androidx.navigation.NavController.onGraphCreated(NavController.java:633)
at androidx.navigation.NavController.setGraph(NavController.java:586)
at androidx.navigation.NavController.setGraph(NavController.java:551)
at androidx.navigation.NavController.setGraph(NavController.java:533)
at androidx.navigation.fragment.NavHostFragment.onCreate(NavHostFragment.java:238)
at androidx.fragment.app.Fragment.performCreate(Fragment.java:2684)
at androidx.fragment.app.FragmentStateManager.create(FragmentStateManager.java:280)
at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1175)
at androidx.fragment.app.FragmentManager.addAddedFragments(FragmentManager.java:2224)
at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:1997)
at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:1953)
at androidx.fragment.app.FragmentManager.execSingleAction(FragmentManager.java:1818)
at androidx.fragment.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:303)
at androidx.fragment.app.FragmentContainerView.<init>(FragmentContainerView.java:166)
at androidx.fragment.app.FragmentLayoutInflaterFactory.onCreateView(FragmentLayoutInflaterFactory.java:51)
at androidx.fragment.app.FragmentController.onCreateView(FragmentController.java:135)
at androidx.fragment.app.FragmentActivity.dispatchFragmentsOnCreateView(FragmentActivity.java:356)
at androidx.fragment.app.FragmentActivity.onCreateView(FragmentActivity.java:335)
at android.view.LayoutInflater.tryCreateView(LayoutInflater.java:1069)
2020-10-28 12:23:26.527 12977-12977/com.example.navigationdemo E/AndroidRuntime: at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:997)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:961)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:1123)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1084)
at android.view.LayoutInflater.inflate(LayoutInflater.java:682)
at android.view.LayoutInflater.inflate(LayoutInflater.java:534)
at android.view.LayoutInflater.inflate(LayoutInflater.java:481)
at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:696)
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:170)
at com.example.navigationdemo.ui.main.MainActivity.onCreate(MainActivity.java:15)
at android.app.Activity.performCreate(Activity.java:7802)
at android.app.Activity.performCreate(Activity.java:7791)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1299)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3245)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)

Replace your full code in main_activity with this:
<?xml version="1.0" encoding="utf-8"?>
<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.main.MainActivity">
<androidx.fragment.app.FragmentContainerView
android:id="#+id/demo_nav_host_fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:defaultNavHost="true"
app:navGraph="#navigation/navigation_graph" />
</androidx.constraintlayout.widget.ConstraintLayout>

In the navigation graph, you must specify the android:name
<fragment
android:id="#+id/homeFragment"
android:name="com.zoho.sample.fragment.HomeFragment"
android:label="Home"
tools:layout="#layout/fragment_home" />
<fragment

java.lang.RuntimeException: Unable to destroy activity {MainActivity}: java.util.ConcurrentModificationException

When I set my application to background and open it again I have a crash:
java.lang.RuntimeException: Unable to destroy activity {MainActivity}: java.util.ConcurrentModificationException
I'm using navigation graph scope for storing viewmodel
fun <T : ViewModel> getViewModelForGraph(
graphId: Int,
clazz: Class<T>,
fragment: Fragment
): T {
val navController = NavHostFragment.findNavController(fragment)
val vmFactory = object : ViewModelProvider.Factory {
override fun <U : ViewModel?> create(modelClass: Class<U>): U =
Factory.getComponent(clazz) as U
}
return ViewModelProvider(
navController.getViewModelStoreOwner(graphId),
vmFactory
).get(clazz)
}
and I'm getting my viewmodel from fragment this way:
getViewModelForGraph(
R.id.my_sub_graph,
MyViewModel::class.java,
this
)
.getViewModelForGraph(
R.id.mySubGraph,
MyViewModel::class.java,
this
)
And problem resolves when I'm getViewModelForGraph and just attaching my viewmodel to the activity.
Am I using navGraph viewmodel storage in a wrong way?
full stackTrace
java.lang.RuntimeException: Unable to destroy activity {app/MainActivity}: java.util.ConcurrentModificationException
at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:4941)
at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:4970)
at android.app.servertransaction.DestroyActivityItem.execute(DestroyActivityItem.java:44)
at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:176)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
Caused by: java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1441)
at java.util.HashMap$KeyIterator.next(HashMap.java:1465)
at androidx.navigation.NavControllerViewModel.onCleared(NavControllerViewModel.java:62)
at androidx.lifecycle.ViewModel.clear(ViewModel.java:139)
at androidx.lifecycle.ViewModelStore.clear(ViewModelStore.java:62)
at androidx.fragment.app.FragmentManagerViewModel.clearNonConfigState(FragmentManagerViewModel.java:160)
at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:1026)
at androidx.fragment.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManagerImpl.java:1238)
at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:1303)
at androidx.fragment.app.FragmentManagerImpl.dispatchStateChange(FragmentManagerImpl.java:2659)
at androidx.fragment.app.FragmentManagerImpl.dispatchDestroy(FragmentManagerImpl.java:2644)
at androidx.fragment.app.FragmentController.dispatchDestroy(FragmentController.java:329)
at androidx.fragment.app.FragmentActivity.onDestroy(FragmentActivity.java:366)
at androidx.appcompat.app.AppCompatActivity.onDestroy(AppCompatActivity.java:210)
at android.app.Activity.performDestroy(Activity.java:8048)
at android.app.Instrumentation.callActivityOnDestroy(Instrumentation.java:1341)
at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:4926)
at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:4970) 
at android.app.servertransaction.DestroyActivityItem.execute(DestroyActivityItem.java:44) 
at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:176) 
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016) 
at android.os.Handler.dispatchMessage(Handler.java:107) 
at android.os.Looper.loop(Looper.java:214) 
at android.app.ActivityThread.main(ActivityThread.java:7356) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930) 

Instantiating MapBox before inflating the fragment layout cause Exception

I'm following MabBox tutorial at https://docs.mapbox.com/help/tutorials/android-navigation-sdk/ to make a simple navigation fragment that use the basics elements of it.
I already know that MapBox require to instantiate before inflating the View because I made it before on another Fragment to test it out where the fragment is part of a TabLayout component, however, in this one, there's only one Activity that loads the Fragment where I use the SDK and in this case it throws the same error that I fixed previously because I put it afterinflating the layout.
The errore that appears is this one:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.parkingclientapplication, PID: 14257
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.parkingclientapplication/com.example.parkingclientapplication.activities.MapDirectionActivity}: android.view.InflateException: Binary XML file line #8: Binary XML file line #8: Error inflating class com.mapbox.mapboxsdk.maps.MapView
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2817)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: android.view.InflateException: Binary XML file line #8: Binary XML file line #8: Error inflating class com.mapbox.mapboxsdk.maps.MapView
Caused by: android.view.InflateException: Binary XML file line #8: Error inflating class com.mapbox.mapboxsdk.maps.MapView
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Constructor.newInstance0(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:334)
at android.view.LayoutInflater.createView(LayoutInflater.java:647)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:790)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:863)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:287)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139)
at com.example.parkingclientapplication.activities.MapDirectionActivity.onCreate(MapDirectionActivity.kt:15)
at android.app.Activity.performCreate(Activity.java:6975)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: com.mapbox.mapboxsdk.exceptions.MapboxConfigurationException:
Using MapView requires calling Mapbox.getInstance(Context context, String accessToken) before inflating or creating the view. The access token parameter is required when using a Mapbox service.
Please see https://www.mapbox.com/help/create-api-access-token/ to learn how to create one.
More information in this guide https://www.mapbox.com/help/first-steps-android-sdk/#access-tokens.
at com.mapbox.mapboxsdk.Mapbox.validateMapbox(Mapbox.java:165)
at com.mapbox.mapboxsdk.Mapbox.getAccessToken(Mapbox.java:77)
at com.mapbox.mapboxsdk.storage.FileSource.<init>(FileSource.java:234)
at com.mapbox.mapboxsdk.storage.FileSource.getInstance(FileSource.java:68)
at com.mapbox.mapboxsdk.maps.renderer.MapRenderer.<init>(MapRenderer.java:34)
E/AndroidRuntime: at com.mapbox.mapboxsdk.maps.renderer.glsurfaceview.GLSurfaceViewMapRenderer.<init>(GLSurfaceViewMapRenderer.java:33)
at com.mapbox.mapboxsdk.maps.MapView$5.<init>(MapView.java:294)
at com.mapbox.mapboxsdk.maps.MapView.initialiseDrawingSurface(MapView.java:294)
at com.mapbox.mapboxsdk.maps.MapView.initialize(MapView.java:137)
at com.mapbox.mapboxsdk.maps.MapView.<init>(MapView.java:100)
... 25 more
The code for the Activity is:
class MapDirectionActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_map_direction)
supportFragmentManager.inTransaction {
add(R.id.form_clientNavMenu, MapDirectionFragment())
}
//Logout action on custom toolbar layout
logout.setOnClickListener {
val intent = Intent(this, MainActivity::class.java)
startActivity(intent)
}
}
}
The code for the onCreateView method of the Fragment is:
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
Mapbox.getInstance(context!!, getString(R.string.access_token))
val view = inflater.inflate(R.layout.fragment_map_direction, container, false)
mapView = view.findViewById(R.id.mapView)
mapView.onCreate(savedInstanceState)
mapView.getMapAsync(this)
// Inflate the layout for this fragment
return view
}
I only wrote onCreateView method because I think the error could be in there instead on the rest of the code which is the same as in the link, but I could be wrong.

Set the method:
Mapbox.getInstance(this,getString(R.string.access_token));
Before the:
setContentView(R.layout.activity_map);
If you having this exception change code structure as follows.
i.e:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Mapbox.getInstance(this,getString(R.string.access_token));
setContentView(R.layout.activity_map);
mapView = (MapView) findViewById(R.id.mapView);
mapView.onCreate(savedInstanceState);
mapView.getMapAsync(mapboxMap -> mapboxMap.setStyle(
new Style.Builder().fromUrl(Style.MAPBOX_STREETS)
));
}

Thanks #Tobrun for the answer, the problem was not that I missed the accessToken but I mixed activity and fragment layout so the components in one of them should be in the other. However, looking for the accessToken made me realize about other possible ones.