register_navigation.xml

<?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/register_navigation"
    app:startDestination="@+id/nav_register1">


    <fragment
        android:id="@+id/nav_register1"
        android:name="xxx.ui.main.register.Register1Fragment"
        android:label="start"
        tools:layout="@layout/layout_register_1" >

        <action
                android:id="@+id/action_nav_register1_to_nav_register2"
                app:destination="@+id/nav_register2"
                app:popUpTo="@+id/nav_register1">
            <argument
                    android:name="name"
                    android:defaultValue=" "
                    app:argType="string" />
        </action>

    </fragment>

    <fragment
            android:id="@+id/nav_register2"
            android:name="xxx.ui.main.register.Register2Fragment"
            android:label="start2"
            tools:layout="@layout/layout_register_2" >
        <argument
                android:name="name"
                app:argType="string" />
    </fragment>



</navigation>