Setup viewmodel

app/src/main/AndroidManifest.xml

@@ -19,6 +19,7 @@
     package="com.example.android.guesstheword">
 
     <application
+        android:name=".GuessItApplication"
         android:allowBackup="true"
         android:icon="@mipmap/ic_guess_it"
         android:label="@string/app_name"

app/src/main/java/com/example/android/guesstheword/GuessItApplication.kt

@@ -0,0 +1,11 @@
+package com.example.android.guesstheword
+
+import android.app.Application
+import timber.log.Timber
+
+class GuessItApplication: Application() {
+    override fun onCreate() {
+        super.onCreate()
+        Timber.plant(Timber.DebugTree())
+    }
+}

app/src/main/java/com/example/android/guesstheword/screens/game/GameFragment.kt

@@ -22,6 +22,7 @@ import android.view.View
 import android.view.ViewGroup
 import androidx.databinding.DataBindingUtil
 import androidx.fragment.app.Fragment
+import androidx.lifecycle.ViewModelProviders
 import androidx.navigation.fragment.NavHostFragment.findNavController
 import com.example.android.guesstheword.R
 import com.example.android.guesstheword.databinding.GameFragmentBinding
@@ -31,14 +32,7 @@ import com.example.android.guesstheword.databinding.GameFragmentBinding
  */
 class GameFragment : Fragment() {
 
-    // The current word
-    private var word = ""
-
-    // The current score
-    private var score = 0
-
-    // The list of words - the front of the list is the next word to guess
-    private lateinit var wordList: MutableList<String>
+    private lateinit var viewModel: GameViewModel
 
     private lateinit var binding: GameFragmentBinding
 
@@ -53,89 +47,40 @@ class GameFragment : Fragment() {
                 false
         )
 
-        resetList()
-        nextWord()
+        viewModel = ViewModelProviders.of(this).get(GameViewModel::class.java)
 
-        binding.correctButton.setOnClickListener { onCorrect() }
-        binding.skipButton.setOnClickListener { onSkip() }
+        binding.correctButton.setOnClickListener {
+            viewModel.onCorrect()
+            updateScoreText()
+            updateWordText()
+        }
+        binding.skipButton.setOnClickListener {
+            viewModel.onSkip()
+            updateScoreText()
+            updateWordText()
+        }
         updateScoreText()
         updateWordText()
         return binding.root
 
     }
 
-    /**
-     * Resets the list of words and randomizes the order
-     */
-    private fun resetList() {
-        wordList = mutableListOf(
-                "queen",
-                "hospital",
-                "basketball",
-                "cat",
-                "change",
-                "snail",
-                "soup",
-                "calendar",
-                "sad",
-                "desk",
-                "guitar",
-                "home",
-                "railway",
-                "zebra",
-                "jelly",
-                "car",
-                "crow",
-                "trade",
-                "bag",
-                "roll",
-                "bubble"
-        )
-        wordList.shuffle()
-    }
-
     /**
      * Called when the game is finished
      */
     private fun gameFinished() {
-        val action = GameFragmentDirections.actionGameToScore(score)
+        val action = GameFragmentDirections.actionGameToScore(viewModel.score)
         findNavController(this).navigate(action)
     }
 
-    /**
-     * Moves to the next word in the list
-     */
-    private fun nextWord() {
-        //Select and remove a word from the list
-        if (wordList.isEmpty()) {
-            gameFinished()
-        } else {
-            word = wordList.removeAt(0)
-        }
-        updateWordText()
-        updateScoreText()
-    }
-
-    /** Methods for buttons presses **/
-
-    private fun onSkip() {
-        score--
-        nextWord()
-    }
-
-    private fun onCorrect() {
-        score++
-        nextWord()
-    }
-
     /** Methods for updating the UI **/
 
     private fun updateWordText() {
-        binding.wordText.text = word
+        binding.wordText.text = viewModel.word
 
     }
 
     private fun updateScoreText() {
-        binding.scoreText.text = score.toString()
+        binding.scoreText.text = viewModel.score.toString()
     }
 }

app/src/main/java/com/example/android/guesstheword/screens/game/GameViewModel.kt

@@ -0,0 +1,78 @@
+package com.example.android.guesstheword.screens.game
+
+import androidx.lifecycle.ViewModel
+import timber.log.Timber
+
+class GameViewModel(): ViewModel() {
+    // The current word
+    var word = ""
+
+    // The current score
+    var score = 0
+
+    // The list of words - the front of the list is the next word to guess
+    private lateinit var wordList: MutableList<String>
+
+    init {
+        Timber.i("GameViewModel created")
+        resetList()
+        nextWord()
+    }
+
+    override fun onCleared() {
+        super.onCleared()
+        Timber.i("GameViewModel destroyed")
+    }
+
+    /**
+     * Resets the list of words and randomizes the order
+     */
+    private fun resetList() {
+        wordList = mutableListOf(
+                "queen",
+                "hospital",
+                "basketball",
+                "cat",
+                "change",
+                "snail",
+                "soup",
+                "calendar",
+                "sad",
+                "desk",
+                "guitar",
+                "home",
+                "railway",
+                "zebra",
+                "jelly",
+                "car",
+                "crow",
+                "trade",
+                "bag",
+                "roll",
+                "bubble"
+        )
+        wordList.shuffle()
+    }
+
+    /**
+     * Moves to the next word in the list
+     */
+    private fun nextWord() {
+        //Select and remove a word from the list
+        if (wordList.isEmpty()) {
+//            gameFinished()
+        } else {
+            word = wordList.removeAt(0)
+        }
+    }
+
+    fun onSkip() {
+        score--
+        nextWord()
+    }
+
+    fun onCorrect() {
+        score++
+        nextWord()
+    }
+}