Task: Add fragments to the navigation graph

AndroidTriviaFragment/app/build.gradle

@@ -56,4 +56,7 @@ dependencies {
     androidTestImplementation 'androidx.test:runner:1.1.0-alpha4'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0-alpha4'
     implementation "com.google.android.material:material:1.0.0-rc01"
+
+    implementation"android.arch.navigation:navigation-fragment-ktx:$navigationVersion"
+    implementation "android.arch.navigation:navigation-ui-ktx:$navigationVersion"
 }

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

@@ -23,6 +23,7 @@ import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import androidx.databinding.DataBindingUtil
+import androidx.navigation.findNavController
 import com.example.android.navigation.databinding.FragmentTitleBinding
 
 
@@ -41,6 +42,10 @@ class TitleFragment : Fragment() {
                               savedInstanceState: Bundle?): View? {
         val binding = DataBindingUtil.inflate<FragmentTitleBinding>(inflater,
                 R.layout.fragment_title,container,false)
+        
+        binding.playButton.setOnClickListener { view: View ->
+            view.findNavController().navigate(R.id.action_titleFragment_to_gameFragment)
+        }
         return binding.root
     }
 

AndroidTriviaFragment/app/src/main/res/layout/activity_main.xml

@@ -23,10 +23,12 @@
             android:orientation="vertical">
 
             <fragment
-                android:id="@+id/titleFragment"
+                android:id="@+id/myNavHostFragment"
-                android:name="com.example.android.navigation.TitleFragment"
+                android:name="androidx.navigation.fragment.NavHostFragment"
                 android:layout_width="match_parent"
                 android:layout_height="match_parent"
+                app:navGraph = "@navigation/navigation"
+                app:defaultNavHost="true"
                 />
         </LinearLayout>
 

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

@@ -0,0 +1,22 @@
+<?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/navigation"
+    app:startDestination="@id/titleFragment">
+
+    <fragment
+        android:id="@+id/titleFragment"
+        android:name="com.example.android.navigation.TitleFragment"
+        android:label="fragment_title"
+        tools:layout="@layout/fragment_title" >
+        <action
+            android:id="@+id/action_titleFragment_to_gameFragment"
+            app:destination="@id/gameFragment" />
+    </fragment>
+    <fragment
+        android:id="@+id/gameFragment"
+        android:name="com.example.android.navigation.GameFragment"
+        android:label="GameFragment"
+        tools:layout="@layout/fragment_game"/>
+</navigation>

AndroidTriviaFragment/build.gradle

@@ -17,6 +17,7 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 buildscript {
     ext {
+        navigationVersion = '1.0.0-rc02'
         kotlin_version = '1.3.11'
         archLifecycleVersion = '1.1.1'
         gradleVersion = '3.3.1'