19.Exercise: Adding Safe Arguments

app/build.gradle

@@ -20,6 +20,8 @@ apply plugin: 'kotlin-android'
 
 apply plugin: 'kotlin-kapt'
 
+apply plugin: 'androidx.navigation.safeargs'
+
 android {
     compileSdkVersion 28
     dataBinding {

app/src/main/java/com/example/android/navigation/GameFragment.kt

@@ -99,12 +99,15 @@ class GameFragment : Fragment() {
                     } else {
                         // We've won!  Navigate to the gameWonFragment.
                         view.findNavController().
-                            navigate(R.id.action_gameFragment_to_gameWonFragment)
+                            navigate(GameFragmentDirections.actionGameFragmentToGameWonFragment(
+                                numQuestions,questionIndex
+                                )
+                            )
                     }
                 } else {
                     // Game over! A wrong answer sends us to the gameOverFragment.
                     view.findNavController().
-                        navigate(R.id.action_gameFragment_to_gameOverFragment)
+                        navigate(GameFragmentDirections.actionGameFragmentToGameOverFragment())
                 }
             }
         }

app/src/main/java/com/example/android/navigation/GameOverFragment.kt

@@ -33,7 +33,9 @@ class GameOverFragment : Fragment() {
                 inflater, R.layout.fragment_game_over, container, false)
 
         binding.tryAgainButton.setOnClickListener { view: View ->
-            view.findNavController().navigate(R.id.action_gameOverFragment_to_gameFragment)
+            view.findNavController().navigate(
+                    GameOverFragmentDirections.actionGameOverFragmentToGameFragment()
+            )
         }
 
         return binding.root

app/src/main/java/com/example/android/navigation/GameWonFragment.kt

@@ -16,10 +16,11 @@
 
 package com.example.android.navigation
 
+import android.content.Intent
 import android.os.Bundle
-import android.view.LayoutInflater
+import android.view.*
-import android.view.View
+import android.widget.Toast
-import android.view.ViewGroup
+import androidx.core.app.ShareCompat
 import androidx.databinding.DataBindingUtil
 import androidx.fragment.app.Fragment
 import androidx.navigation.findNavController
@@ -34,9 +35,16 @@ class GameWonFragment : Fragment() {
                 inflater, R.layout.fragment_game_won, container, false)
 
         binding.nextMatchButton.setOnClickListener { view: View ->
-            view.findNavController().navigate(R.id.action_gameWonFragment_to_gameFragment)
+            view.findNavController().navigate(
+                    GameWonFragmentDirections.actionGameWonFragmentToGameFragment())
         }
 
+        var args = GameWonFragmentArgs.fromBundle(arguments!!)
+        Toast.makeText(context,
+                "NumCorrect: ${args.numCorrect}, NumQuestions: ${args.numQuestions}",
+                Toast.LENGTH_LONG).show()
+
+        setHasOptionsMenu(true)
         return binding.root
     }
 }

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

@@ -21,9 +21,12 @@ class TitleFragment : Fragment() {
         //view.findNavController().navigate(R.id.action_titleFragment_to_gameFragment)
         //}
         //or
-        binding.playButton.setOnClickListener(
+//        binding.playButton.setOnClickListener(
-                Navigation.createNavigateOnClickListener(R.id.action_titleFragment_to_gameFragment)
+//                Navigation.createNavigateOnClickListener(R.id.action_titleFragment_to_gameFragment)
-        )
+//        )
+        binding.playButton.setOnClickListener { v: View ->
+            v.findNavController().navigate(TitleFragmentDirections.actionTitleFragmentToGameFragment())
+        }
 
         setHasOptionsMenu(true)
 

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

@@ -48,6 +48,12 @@
             android:id="@+id/action_gameWonFragment_to_gameFragment"
             app:destination="@id/gameFragment"
             app:popUpTo="@id/titleFragment" />
+        <argument
+            android:name="numQuestions"
+            app:argType="integer" />
+        <argument
+            android:name="numCorrect"
+            app:argType="integer" />
     </fragment>
     <fragment
         android:id="@+id/aboutFragment"

build.gradle

@@ -31,6 +31,7 @@ buildscript {
     dependencies {
         classpath 'com.android.tools.build:gradle:3.3.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$version_kotlin"
+        classpath "android.arch.navigation:navigation-safe-args-gradle-plugin:$version_navigation"
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files