Android Kotlin Fundamentals 03.2: Define navigation paths

9. Task: Add an options menu

AndroidTriviaFragment/app/src/main/java/com/example/android/navigation/TitleFragment.kt

@@ -18,12 +18,11 @@
 
 
 import android.os.Bundle
+import android.view.*
 import androidx.fragment.app.Fragment
-import android.view.LayoutInflater
-import android.view.View
-import android.view.ViewGroup
 import androidx.databinding.DataBindingUtil
 import androidx.navigation.findNavController
+import androidx.navigation.ui.NavigationUI
 import com.example.android.navigation.databinding.FragmentTitleBinding
 
 
@@ -46,8 +45,18 @@ class TitleFragment : Fragment() {
         binding.playButton.setOnClickListener { view: View ->
             view.findNavController().navigate(R.id.action_titleFragment_to_gameFragment)
         }
+        setHasOptionsMenu(true)
         return binding.root
     }
 
+    override fun onCreateOptionsMenu(menu: Menu?, inflater: MenuInflater?) {
+        super.onCreateOptionsMenu(menu, inflater)
+        inflater?.inflate(R.menu.option_menu, menu)
+    }
+
+    override fun onOptionsItemSelected(item: MenuItem?): Boolean {
+        return  NavigationUI.onNavDestinationSelected(item!!, view!!.findNavController())
+                || super.onOptionsItemSelected(item)
+    }
 
 }

AndroidTriviaFragment/app/src/main/res/menu/option_menu.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <item
+        android:id="@+id/aboutFragment"
+        android:title="@string/about" />
+</menu>

AndroidTriviaFragment/app/src/main/res/navigation/navigation.xml

@@ -52,4 +52,9 @@
             app:popUpTo="@id/titleFragment"
             app:popUpToInclusive="false" />
     </fragment>
+    <fragment
+        android:id="@+id/aboutFragment"
+        android:name="com.example.android.navigation.AboutFragment"
+        android:label="fragment_about"
+        tools:layout="@layout/fragment_about" />
 </navigation>