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
Related
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
My application consists of a ViewPager that contains 9 Fragments of the same type. This Fragment takes a parameter in its constructor upon declaration as shown below.
NewsFragment.kt
class NewsFragment(section: NewsSection) : Fragment() {
//...
}
CategoryFragmentPagerAdapter.kt
class CategoryFragmentPagerAdapter(fm: FragmentManager)
: FragmentPagerAdapter(fm, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT) {
override fun getItem(position: Int): Fragment =
NewsFragment(NewsSection.getItem(position))
override fun getCount(): Int = NewsSection.values().size
override fun getPageTitle(position: Int): CharSequence =
NewsSection.getItem(position).sectionName
}
And this fragment contains some actions which should navigate the user to some other fragments.
I tried to implement the navigation using the Jetpack Navigation Component method but looks it gives an error because the navigation graph can't accept a fragment with a parameter.
Any ideas on how to implement the Navigation in such a situation?
Edit
So this is my FragmentContainerView in the activity's XML layout
<androidx.fragment.app.FragmentContainerView
android:id="#+id/fragment_container"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:defaultNavHost="true"
app:navGraph="#navigation/navigation" />
and this is how I implement the navController in the activity
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setupDataBinding()
val navHostFragment = supportFragmentManager.findFragmentById(R.id.fragment_container) as NavHostFragment
val navController = navHostFragment.navController
}
I didn't add any more configuration, and this is the error that pops up when I run the app
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.domain.news/com.domain.news.ui.activities.MainActivity}: android.view.InflateException: Binary XML file line #18 in com.domain.news:layout/activity_main: Binary XML file line #22 in com.domain.news:layout/content_main: Error inflating class androidx.fragment.app.FragmentContainerView
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3307)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3446)
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:2043)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:224)
at android.app.ActivityThread.main(ActivityThread.java:7548)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)
Caused by: android.view.InflateException: Binary XML file line #18 in com.domain.news:layout/activity_main: Binary XML file line #22 in com.domain.news:layout/content_main: Error inflating class androidx.fragment.app.FragmentContainerView
Caused by: android.view.InflateException: Binary XML file line #22 in com.domain.news:layout/content_main: Error inflating class androidx.fragment.app.FragmentContainerView
Caused by: androidx.fragment.app.Fragment$InstantiationException: Unable to instantiate fragment com.domain.news.ui.fragments.news.NewsFragment: could not find Fragment constructor
at androidx.fragment.app.Fragment.instantiate(Fragment.java:563)
at androidx.fragment.app.FragmentContainer.instantiate(FragmentContainer.java:57)
at androidx.fragment.app.FragmentManager$3.instantiate(FragmentManager.java:390)
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: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)
2020-09-19 20:39:22.012 16179-16179/com.domain.news E/AndroidRuntime: 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:1073)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:1001)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:965)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:1127)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1088)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:1130)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1088)
at android.view.LayoutInflater.parseInclude(LayoutInflater.java:1267)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:1123)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1088)
at android.view.LayoutInflater.parseInclude(LayoutInflater.java:1267)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:1123)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1088)
at android.view.LayoutInflater.inflate(LayoutInflater.java:686)
at android.view.LayoutInflater.inflate(LayoutInflater.java:538)
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 androidx.databinding.DataBindingUtil.setContentView(DataBindingUtil.java:303)
at androidx.databinding.DataBindingUtil.setContentView(DataBindingUtil.java:284)
at com.domain.news.utils.delegates.ActivityBindingProperty.createActivityBinding(Databinding.kt:20)
at com.domain.news.utils.delegates.ActivityBindingProperty.getValue(Databinding.kt:16)
at com.domain.news.ui.activities.MainActivity.getBinding(Unknown Source:10)
at com.domain.news.ui.activities.MainActivity.setupBinding(MainActivity.kt:42)
at com.domain.news.ui.activities.MainActivity.onCreate(MainActivity.kt:34)
at android.app.Activity.performCreate(Activity.java:7893)
at android.app.Activity.performCreate(Activity.java:7880)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1307)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3282)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3446)
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:2043)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:224)
at android.app.ActivityThread.main(ActivityThread.java:7548)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)
Caused by: java.lang.NoSuchMethodException: com.domain.news.ui.fragments.news.NewsFragment.<init> []
at java.lang.Class.getConstructor0(Class.java:2332)
at java.lang.Class.getConstructor(Class.java:1728)
at androidx.fragment.app.Fragment.instantiate(Fragment.java:548)
... 66 more
And I can see from the last 3 lines that the reason is because of the fragment constructor
First, open your
app:navGraph="#navigation/navigation
The Error Clearly states that it cant inflate your XMl, (Maybe somewhere in line 18 of your #navigation/navigation XML file)
You need to pass the data in the fragment's argument bundle instead of in the constructor.
To do this NewsSection needs to implement Parcelable
In your navigation xml you can do something like:
<fragment
android:id="#+id/newsFragment"
android:name="com.example.NewsFragment"
android:label="ProductListerFragment"
tools:layout="#layout/fragment_news_secion">
<argument
android:name="newsSection"
app:argType="com.example.NewsSection" />
And in the fragment you're navigating from:
val newsSection = NewsSection(....)
val bundle = bundleOf("newsSection" to newsSection)
view.findNavController().navigate(R.id.newsAction, bundle)
And in NewsFragment:
val newsSection = arguments?.getParcelable("newsSection") as? NewsSection
See https://developer.android.com/guide/navigation/navigation-pass-data for more details.
I want to use databinding at the entrance to the navigation.
When I use fragment(android:name="NavHostFragment") in the activity, the program can run normally;
but when I use fragment in the activity (android:name="NavHostFragment") + databinding, the program will not run.
Please help me, I hope to use databinding at the entrance of the navigation, please tell me how to use it, thank you! !
Exception：
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.appnavigationtodo/com.example.appnavigationtodo.MainActivity}: android.view.InflateException: Binary XML file line #21: Binary XML file line #21: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3092)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3235)
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:1926)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:6990)
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:1445)
Caused by: android.view.InflateException: Binary XML file line #21: Binary XML file line #21: Error inflating class fragment
Caused by: android.view.InflateException: Binary XML file line #21: Error inflating class fragment
Caused by: java.lang.IllegalArgumentException: Binary XML file line #21: Duplicate id 0x7f080050, tag null, or parent id 0xffffffff with another fragment for androidx.navigation.fragment.NavHostFragment
at androidx.fragment.app.FragmentManagerImpl.onCreateView(FragmentManager.java:3752)
at androidx.fragment.app.FragmentController.onCreateView(FragmentController.java:120)
at androidx.fragment.app.FragmentActivity.dispatchFragmentsOnCreateView(FragmentActivity.java:405)
at androidx.fragment.app.FragmentActivity.onCreateView(FragmentActivity.java:387)
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.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:469)
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
at androidx.databinding.DataBindingUtil.setContentView(DataBindingUtil.java:303)
at androidx.databinding.DataBindingUtil.setContentView(DataBindingUtil.java:284)
at com.example.appnavigationtodo.MainActivity.onCreate(MainActivity.java:25)
at android.app.Activity.performCreate(Activity.java:7326)
at android.app.Activity.performCreate(Activity.java:7317)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3072)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3235)
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:1926)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:6990)
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:1445)
MainActivity.java：
public class MainActivity extends AppCompatActivity {
private ActivityMainBinding activityMainBinding;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
activityMainBinding = DataBindingUtil.setContentView(this,R.layout.activity_main);
}
}
activity_main.xml：
<layout 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">
<data>
</data>
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ToolbarTheme" />
<fragment
android:id="#+id/fragmentMain"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
app:defaultNavHost="true"
app:navGraph="#navigation/nav_main" />
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/bottomNavigationView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:menu="#menu/menu_bottom_navigation_view" />
</LinearLayout>
</layout>
You're calling setContentView twice, once with setContentView and a second time with DataBindingUtil.setContentView(). Instead, just use DataBindingUtil.setContentView(), which calls setContentView() itself internally:
public class MainActivity extends AppCompatActivity {
private ActivityMainBinding activityMainBinding;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
activityMainBinding = DataBindingUtil.setContentView(this,R.layout.activity_main);
}
}
This question already has answers here:
What is a NullPointerException, and how do I fix it?
(12 answers)
Closed 1 year ago.
I have a fragment where I want to display values from a List, so I get it like this in Activity Recipe Detail
IngredientsFragment ingredientsFrag = new IngredientsFragment();
ingredientsFrag.setPosition(position);
ingredientsFrag.setRecipes(MainActivity.receipes);
getSupportFragmentManager().beginTransaction()
.replace(R.id.FRGingredients, ingredientsFrag)
.commit();
The main thing up there to take note of is the SetRecipes() Method, I am passing in a List, it is a static List in the MainActivity class.
In the Ingredients fragment I have this in Ingredient Fragment:
public class IngredientsFragment extends Fragment {
int position;
List<Recipe> mRecipes;
String test;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.frag_recipe_ingredients, container, false);
TextView ingredients = rootView.findViewById(R.id.ingredientsTxt);
ingredients.setText(String.valueOf(mRecipes.get(0).getName()));
return rootView;
}
public void setPosition(int position) {
this.position = position;
}
public void setRecipes(List<Recipe> recipes) {
test = String.valueOf(recipes.get(0).getName());
mRecipes = recipes;
}
}
When I run this code this is what I get:
11-10 23:14:17.682 2812-2812/com.lemuel.lemubit.bakenow E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.lemuel.lemubit.bakenow, PID: 2812
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.lemuel.lemubit.bakenow/com.lemuel.lemubit.bakenow.RecipeDetail}: android.view.InflateException: Binary XML file line #9: Binary XML file line #9: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2583)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2665)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1499)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:207)
at android.app.ActivityThread.main(ActivityThread.java:5765)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679)
Caused by: android.view.InflateException: Binary XML file line #9: Binary XML file line #9: Error inflating class fragment
at android.view.LayoutInflater.inflate(LayoutInflater.java:539)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:289)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139)
at com.lemuel.lemubit.bakenow.RecipeDetail.onCreate(RecipeDetail.java:15)
at android.app.Activity.performCreate(Activity.java:6360)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1113)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2530)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2665)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1499)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:207)
at android.app.ActivityThread.main(ActivityThread.java:5765)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679)
Caused by: android.view.InflateException: Binary XML file line #9: Error inflating class fragment
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:782)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:835)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:289)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139)
at com.lemuel.lemubit.bakenow.RecipeDetail.onCreate(RecipeDetail.java:15)
at android.app.Activity.performCreate(Activity.java:6360)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1113)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2530)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2665)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1499)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:207)
at android.app.ActivityThread.main(ActivityThread.java:5765)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679)
Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'java.lang.Object java.util.List.get(int)' on a null object reference
at com.lemuel.lemubit.bakenow.Fragments.IngredientsFragment.onCreateView(IngredientsFragment.java:34)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:2239)
at android.support.v4.app.FragmentManagerImpl.ensureInflatedFragmentView(FragmentManager.java:1507)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1303)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1502)
at android.support.v4.app.FragmentManagerImpl.addFragment(FragmentManager.java:1737)
at android.support.v4.app.FragmentManagerImpl.onCreateView(FragmentManager.java:3512)
at android.support.v4.app.FragmentController.onCreateView(FragmentController.java:120)
at android.support.v4.app.FragmentActivity.dispatchFragmentsOnCreateView(FragmentActivity.java:330)
at android.support.v4.app.BaseFragmentActivityApi14.onCreateView(BaseFragmentActivityApi14.java:39)
at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:75)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:754)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:835)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
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:289)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139)
at com.lemuel.lemubit.bakenow.RecipeDetail.onCreate(RecipeDetail.java:15)
at android.app.Activity.performCreate(Activity.java:6360)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1113)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2530)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2665)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1499)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:207)
at android.app.ActivityThread.main(ActivityThread.java:5765)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679)
So it does not recognize the variable mRecipes, but what puzzles me is that when I use the variable test it woks, which means that the list actually is passed down in the method, but anytime I try accessing it in onCreateView, it tell me that null error. Though I can access test if I change it to
ingredients.setText(test);
It works when I do it like that, which means OnCreateView is seeing variable test it also means that the List passed into the method initially was not null.
That's not how you pass an array or any other variable for that matter to a fragment from an activity. You have to pass a bundle holding your array to your fragment with:
Bundle bundle = new Bundle();
bundle.putStringArrayList("edttext", arraylist);
Fragmentclass fragobj = new Fragmentclass();
fragobj.setArguments(bundle);
IngredientsFragment ingredientsFrag = new IngredientsFragment();
ingredientsFrag.setArguments(bundle);
getSupportFragmentManager().beginTransaction()
.replace(R.id.FRGingredients, ingredientsFrag)
.commit();
Make sure your POJO Recipe implements Parcelable.
Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'java.lang.Object java.util.List.get(int)' on a null object reference
at com.lemuel.lemubit.bakenow.Fragments.IngredientsFragment.onCreateView(IngredientsFragment.java:34)
the exception is clear NullPointerException while accessing the list.
you have to put your list into Bundle and set it as arguments to your fragment ..
then in the fragment class you can get this bundle from your fragment in the onCreateView method.
I am using Google Maps for Work. While inflating MapFragment, following exception is thrown:
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.emerson.oversight/oversight.controller.ui.activities.MapActivity}: android.view.InflateException: Binary XML file line #72: Binary XML file line #72: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3254)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3350)
at android.app.ActivityThread.access$1100(ActivityThread.java:222)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1795)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7229)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: android.view.InflateException: Binary XML file line #72: Binary XML file line #72: Error inflating class fragment
at android.view.LayoutInflater.inflate(LayoutInflater.java:551)
at android.view.LayoutInflater.inflate(LayoutInflater.java:429)
at android.view.LayoutInflater.inflate(LayoutInflater.java:380)
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:292)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
at oversight.controller.ui.activities.MapActivity.onCreate(MapActivity.java:27)
at android.app.Activity.performCreate(Activity.java:6876)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1135)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3207)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3350)
at android.app.ActivityThread.access$1100(ActivityThread.java:222)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1795)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7229)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: android.view.InflateException: Binary XML file line #72: Error inflating class fragment
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:794)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:716)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:847)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:810)
at android.view.LayoutInflater.inflate(LayoutInflater.java:527)
at android.view.LayoutInflater.inflate(LayoutInflater.java:429)
at android.view.LayoutInflater.inflate(LayoutInflater.java:380)
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:292)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
at oversight.controller.ui.activities.MapActivity.onCreate(MapActivity.java:27)
at android.app.Activity.performCreate(Activity.java:6876)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1135)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3207)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3350)
at android.app.ActivityThread.access$1100(ActivityThread.java:222)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1795)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7229)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: android.content.res.Resources$NotFoundException: File res/drawable-anydpi-v21/maps_watermark_color.xml from drawable resource ID #0x7f0200d7
at android.content.res.Resources.loadDrawableForCookie(Resources.java:4220)
at android.content.res.Resources.loadDrawable(Resources.java:4089)
at android.content.res.Resources.getDrawable(Resources.java:2005)
at android.content.res.Resources.getDrawable(Resources.java:1987)
at android.content.res.Resources.getDrawable(Resources.java:1961)
at com.google.android.m4b.maps.bl.by.<init>(WidgetContainer.java:1092)
at com.google.android.m4b.maps.bl.by.<init>(WidgetContainer.java:64)
at com.google.android.m4b.maps.bl.t.a(GoogleMapImpl.java:367)
at com.google.android.m4b.maps.bl.t.a(GoogleMapImpl.java:320)
at com.google.android.m4b.maps.bl.am$a.a(MapFragmentDelegateImpl.java:1082)
at com.google.android.m4b.maps.bl.am.a(MapFragmentDelegateImpl.java:139)
at com.google.android.m4b.maps.MapFragment$a.a(MapFragment.java:120)
at com.google.android.m4b.maps.s.a$3.b(DeferredLifecycleHelper.java:231)
at com.google.android.m4b.maps.s.a.a(DeferredLifecycleHelper.java:140)
at com.google.android.m4b.maps.s.a.a(DeferredLifecycleHelper.java:222)
at com.google.android.m4b.maps.MapFragment.onCreateView(MapFragment.java:477)
at android.app.Fragment.performCreateView(Fragment.java:2281)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:954)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1141)
at android.app.FragmentManagerImpl.addFragment(FragmentManager.java:1245)
at android.app.FragmentManagerImpl.onCreateView(FragmentManager.java:2218)
at android.app.FragmentController.onCreateView(FragmentController.java:98)
at android.app.Activity.onCreateView(Activity.java:6070)
at android.
Activity class:
public class MapActivity extends AppCompatActivity implements OnMapReadyCallback {
public static final String EXTRA_MAP_DATA = "EXTRA_MAP_DATA";
private GoogleMap mMap;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.map);
MapFragment mapFragment = (MapFragment) getFragmentManager()
.findFragmentById(R.id.mapFragment);
mapFragment.getMapAsync(this);
}
#Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
final TrackerStatusList status = getIntent().getParcelableExtra(EXTRA_MAP_DATA);
googleMap.addMarker(new MarkerOptions().position(new LatLng(status.getLatitude(), status.getLongitude())));
googleMap.setInfoWindowAdapter(new GoogleMap.InfoWindowAdapter() {
#Override
public View getInfoWindow(Marker marker) {
View view = LayoutInflater.from(MapActivity.this).inflate(R.layout.info_win, null);
((TextView) view.findViewById(R.id.tvTripNameMap)).setText(status.getTripName());
((TextView) view.findViewById(R.id.tvSerial)).setText(status.getTrackerId());
((TextView) view.findViewById(R.id.tvTemperature)).setText(status.getTemperatureString());
((TextView) view.findViewById(R.id.tvLocation)).setText(status.getAddressGeo());
return view;
}
#Override
public View getInfoContents(Marker marker) {
return null;
}
});
}
Layout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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/activity_select_a__trip"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/bg"
android:orientation="vertical"
tools:context="oversight.controller.ui.activities.SelectA_TripActivity">
<!--Exception is caused here. (This is line number 72):--><fragment
android:id="#+id/mapFragment"
class="com.google.android.m4b.maps.MapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
here is your root of problem :.....
Resources$NotFoundException: File res/drawable-anydpi-v21/maps_watermark_color.xml from drawable resource ID #0x7f0200d7 . Better check it out for the guide at https://developers.google.com/maps/premium/android-get-started