java.lang.IllegalArgumentException: Navigation action/destination

1.4k Views Asked by At

I'm building a notes application. I want to save the note when user press the back button from the createsNotesFragment and finish the createNotesFragment so that I can move to the homeFragment. The code I've used to do this is below:

activity?.onBackPressedDispatcher?.addCallback(this){
            saveNote()
            activity?.supportFragmentManager?.popBackStack()
        }

This is working fine. But when I try to again open the createNotesFragment to add an another note it shows me this error.

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.lavanianotesapp, PID: 4952
    java.lang.IllegalArgumentException: Navigation action/destination com.example.lavanianotesapp:id/action_homeFragment_to_createNotesFragment cannot be found from the current destination Destination(com.example.lavanianotesapp:id/createNotesFragment) label=fragment_create_notes class=com.example.lavanianotesapp.UI.Fragments.CreateNotesFragment
        at androidx.navigation.NavController.navigate(NavController.kt:1540)
        at androidx.navigation.NavController.navigate(NavController.kt:1472)
        at androidx.navigation.NavController.navigate(NavController.kt:1454)
        at androidx.navigation.NavController.navigate(NavController.kt:1437)

Here is my nav Graph

<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/nav_graph"
    app:startDestination="@id/homeFragment">

    <fragment
        android:id="@+id/homeFragment"
        android:name="com.example.lavanianotesapp.UI.Fragments.HomeFragment"
        android:label="fragment_home"
        tools:layout="@layout/fragment_home" >
        <action
            android:id="@+id/action_homeFragment_to_createNotesFragment"
            app:destination="@id/createNotesFragment" />
        <action
            android:id="@+id/action_homeFragment_to_editNotesFragment"
            app:destination="@id/editNotesFragment" />
    </fragment>
    <fragment
        android:id="@+id/createNotesFragment"
        android:name="com.example.lavanianotesapp.UI.Fragments.CreateNotesFragment"
        android:label="fragment_create_notes"
        tools:layout="@layout/fragment_create_notes" >
        <action
            android:id="@+id/action_createNotesFragment_to_homeFragment"
            app:destination="@id/homeFragment" />
        <action
            android:id="@+id/action_createNotesFragment_to_addLabelFragment"
            app:destination="@id/addLabelFragment" />
    </fragment>
    <fragment
        android:id="@+id/editNotesFragment"
        android:name="com.example.lavanianotesapp.UI.Fragments.EditNotesFragment"
        android:label="fragment_edit_notes"
        tools:layout="@layout/fragment_edit_notes" >
        <action
            android:id="@+id/action_editNotesFragment_to_homeFragment"
            app:destination="@id/homeFragment" />
        <action
            android:id="@+id/action_editNotesFragment_to_addLabelFragment"
            app:destination="@id/addLabelFragment" />
    </fragment>
    <fragment
        android:id="@+id/addLabelFragment"
        android:name="com.example.lavanianotesapp.UI.Fragments.AddLabelFragment"
        android:label="fragment_add_label"
        tools:layout="@layout/fragment_add_label" >
        <action
            android:id="@+id/action_addLabelFragment_to_createNotesFragment"
            app:destination="@id/createNotesFragment" />
        <action
            android:id="@+id/action_addLabelFragment_to_editNotesFragment"
            app:destination="@id/editNotesFragment" />
    </fragment>
</navigation>

I don't understant why after popBackStack() I'm not able to open the createNotesFragment again. Is there any alternative of popBackStack or what I'm missing?

2

There are 2 best solutions below

0
On BEST ANSWER

you could try check current destination of your current screen like this:

//id = nav graph fragment id
        if (findNavController().currentDestination?.id == id) {
            //do something here
            findNavController().popBackStack()
        }
2
On

nav Graph file,


 <fragment
        android:id="@+id/createNotesFragment" 
  android:name="com.example.lavanianotesapp.UI.Fragments.CreateNotesFragment"
        android:label="@string/fragment_create_notes"
        tools:layout="@layout/fragment_create_notes">
        <action
            android:id="@+id/action_createNotesFragment_to_homeFragment"
            app:destination="@id/nav_home"
            app:launchSingleTop="true"
            app:popUpTo="@id/nav_trip"
            app:popUpToInclusive="true">
            <argument
                android:name="trip_info_response"
                android:defaultValue="@null"
                app:argType="com.example.lavanianotesapp.UI.entities.TripInfoData"
                app:nullable="true" />
        </action>

User press the back button from the createsNotesFragment file,

activity?.onBackPressedDispatcher?.addCallback(this){
            saveNote()
            findNavController().popBackStack()
        }