I have data, I transfer it from mainActivity to homefragment which is inside FragmentContainerView Then I use BottomNavigationView to move between other fragments inside FragmentContainerView, but I get the following error And when I remove the code to send data to homefragment, it works fine. Is there a solution to make the two work together at the same time?
Error
Process: com.example.onestore, PID: 7385
java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.Context androidx.fragment.app.FragmentHostCallback.getContext()' on a null object reference
at androidx.fragment.app.FragmentManager$3.instantiate(FragmentManager.java:507)
at androidx.navigation.fragment.FragmentNavigator.createFragmentTransaction(FragmentNavigator.kt:250)
at androidx.navigation.fragment.FragmentNavigator.navigate(FragmentNavigator.kt:185)
at androidx.navigation.fragment.FragmentNavigator.navigate(FragmentNavigator.kt:164)
at androidx.navigation.NavController.navigateInternal(NavController.kt:260)
at androidx.navigation.NavController.navigate(NavController.kt:1719)
at androidx.navigation.NavController.navigate(NavController.kt:1545)
at androidx.navigation.NavController.navigate(NavController.kt:1472)
at androidx.navigation.ui.NavigationUI.onNavDestinationSelected(NavigationUI.kt:92)
at com.example.onestore.MainActivity.onCreate$lambda$2(MainActivity.kt:45)
at com.example.onestore.MainActivity.$r8$lambda$p3Ght_wmrnZ4Tl5QQoEfelfbqjI(Unknown Source:0)
at com.example.onestore.MainActivity$$ExternalSyntheticLambda0.onNavigationItemSelected(Unknown Source:4)
at com.google.android.material.navigation.NavigationBarView$1.onMenuItemSelected(NavigationBarView.java:291)
at androidx.appcompat.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:836)
at androidx.appcompat.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:159)
at androidx.appcompat.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:987)
at com.google.android.material.navigation.NavigationBarMenuView$1.onClick(NavigationBarMenuView.java:139)
at android.view.View.performClick(View.java:7448)
at android.view.View.performClickInternal(View.java:7425)
at android.view.View.access$3600(View.java:810)
at android.view.View$PerformClick.run(View.java:28305)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7656)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
mainActivity
class MainActivity : AppCompatActivity() {
private lateinit var binding : ActivityMainBinding
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding=ActivityMainBinding.inflate(layoutInflater)
//Data received
val bundle = intent.extras
val Datas = bundle?.getParcelable("EXTRA_SESSION_ID") as? Datahome
Datas?.result?.home_1?.let { Log.i("TAA", it.title) }
//send Data to homeFragment
val MyData = Datas
val fragment = MyData?.let { HomeFragment.newInstance(it) }
if (fragment != null) {
supportFragmentManager
.beginTransaction()
.replace(R.id.fragmentContainerView2,fragment )
.commit()
}
val navHomeFragment = supportFragmentManager
.findFragmentById(R.id.fragmentContainerView2) as NavHostFragment
binding.bottomNavigationView.setupWithNavController(navHomeFragment.navController)
binding.bottomNavigationView.setOnItemSelectedListener { item ->
Log.i("BF" ,item.toString())
binding.bottomNavigationView.menu.findItem(item.itemId).isChecked = false
NavigationUI.onNavDestinationSelected(item,navHomeFragment.navController)
return@setOnItemSelectedListener false
}
setContentView(binding.root)
}
}
homeFargment
class HomeFragment : Fragment() {
private lateinit var binding: FragmentHomeBinding
companion object {
fun newInstance(yourData: Datahome) = HomeFragment().apply {
arguments = Bundle().apply { putParcelable("Key", yourData) }
}
}
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
binding = FragmentHomeBinding.inflate(inflater, container, false)
return binding.root
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
//receive Data From BaseFragment
val data : Datahome? = arguments?.getParcelable("Key")
if (data != null) {
insertData(data)
}
}
activity main
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:tools="http://schemas.android.com/tools"
android:background="@color/white">
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="@+id/bottomNavigationView"
style="@style/Widget.MaterialComponents.BottomNavigationView.PrimarySurface"
android:layout_width="0dp"
android:layout_height="50dp"
android:background="@color/white"
android:clipToPadding="false"
android:paddingStart="10dp"
android:paddingTop="4dp"
android:paddingEnd="10dp"
android:paddingBottom="2dp"
app:elevation="50dp"
app:itemBackground="@drawable/bottom_nav_background"
app:itemIconTint="@drawable/bottom_nav_item"
app:itemPaddingBottom="5dp"
app:itemPaddingTop="2dp"
app:itemTextColor="@drawable/bottom_nav_item"
app:labelVisibilityMode="labeled"
android:layoutDirection="rtl"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:menu="@menu/botton_nav_menu" />
<androidx.fragment.app.FragmentContainerView
android:id="@+id/fragmentContainerView2"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="0dp"
android:layout_height="0dp"
app:defaultNavHost="true"
app:layout_constraintBottom_toTopOf="@+id/bottomNavigationView"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:context=".BaseFragment"
app:navGraph="@navigation/nav_graph" />
</androidx.constraintlayout.widget.ConstraintLayout>
nav-Grap
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/nav_graph"
app:startDestination="@id/homeFragment">
<fragment
android:id="@+id/homeFragment"
android:name="com.example.onestore.Fragment.HomeFragment"
android:label="fragment_home"
tools:layout="@layout/fragment_home" />
<fragment
android:id="@+id/CategoryFragment"
android:name="com.example.onestore.Fragment.categortFragment"
android:label="fragment_categort"
tools:layout="@layout/fragment_categort" />
<fragment
android:id="@+id/SearchFragment"
android:name="com.example.onestore.Fragment.SearchFragment"
android:label="fragment_search"
tools:layout="@layout/fragment_search" />
</navigation>
menu
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="@+id/homeFragment"
android:icon="@drawable/baseline_home_24"
android:title="@string/home"
/>
<item
android:id="@+id/CategoryFragment"
android:icon="@drawable/baseline_category_24"
android:title="@string/category" />
<item
android:id="@+id/SearchFragment"
android:icon="@drawable/baseline_search_24"
android:title="@string/search" />
</menu>