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Is it possible to have dynamic destination in Nested Navigation Graph Android?

I have implemented a nested graph in Navigation graph, which is having 2 graphs. In the first graph, there are 3 fragments and in the second graph, there are 2 fragments. Graph 2 is included in graph 1. I want to navigate to (graph 1 step 1) to (graph 2 step 2). We can not define action between two nested fragments. So is there any way by which we can assign the dynamic destination to navigation?

enter image description here

Graph 1

<?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/mobile_navigation"
    app:startDestination="@id/dashboardFragment">
    <fragment
        android:id="@+id/dashboardFragment"
        android:name="com.navigationgraphexample.fragments.DashboardFragment"
        android:label="fragment_dashboard"
        tools:layout="@layout/fragment_dashboard" >
        <action
            android:id="@+id/action_dashboardFragment_to_stepOneFragment2"
            app:destination="@id/stepOneFragment" />
        <action
            android:id="@+id/action_dashboardFragment_to_sub_nav"
            app:destination="@id/sub_nav" />

    </fragment>
    <fragment
        android:id="@+id/stepOneFragment"
        android:name="com.navigationgraphexample.fragments.StepOneFragment"
        android:label="fragment_step_one"
        tools:layout="@layout/fragment_step_one">
        <action
            android:id="@+id/action_stepOneFragment_to_stepTwoFragment"
            app:destination="@id/stepTwoFragment" />
    </fragment>
    <fragment
        android:id="@+id/stepTwoFragment"
        android:name="com.navigationgraphexample.fragments.StepTwoFragment"
        android:label="fragment_step_two"
        tools:layout="@layout/fragment_step_two" />
    <fragment
        android:id="@+id/notificationFragment"
        android:name="com.navigationgraphexample.fragments.NotificationFragment"
        android:label="fragment_notification"
        tools:layout="@layout/fragment_notification" >
        <deepLink
            android:id="@+id/deepLink"
            app:uri="myapp.com/{myargs}"
            />
        <argument android:name="myargs"
            app:argType="integer"
            android:defaultValue="1" />
    </fragment>
    <include app:graph="@navigation/sub_nav" />
</navigation>

Graph 2

<?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/sub_nav"
    app:startDestination="@id/createNewTaskFragment">

    <fragment
        android:id="@+id/listFragment"
        android:name="com.navigationgraphexample.fragments.ListFragment"
        android:label="fragment_list"
        tools:layout="@layout/fragment_list" />
    <fragment
        android:id="@+id/createNewTaskFragment"
        android:name="com.navigationgraphexample.fragments.CreateNewTaskFragment"
        android:label="fragment_create_new_task"
        tools:layout="@layout/fragment_create_new_task" >
        <action
            android:id="@+id/action_createNewTaskFragment_to_listFragment"
            app:destination="@id/listFragment" />
    </fragment>
</navigation>

I have checked this solution but it is not for the nested graph!

like image 280
Malik Motani Avatar asked Sep 14 '18 07:09

Malik Motani


1 Answers

As far as class NavGraph extends NavDestination, you can try the following to change nested graph's startDestination before calling navigate to sub_nav:

val graph = navController.graph.findNode(R.id.sub_nav)
if (graph is NavGraph) {
    graph.startDestination = R.id.createNewTaskFragment
}

UPD: Since version 2.4.0 all Navigation artifacts have been rewritten in Kotlin, so the setter should be accessed by it's original name:

graph.setStartDestination(R.id.createNewTaskFragment)
like image 191
Vasilii Shumilov Avatar answered Oct 12 '22 22:10

Vasilii Shumilov