adding the Timer step 6

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

@@ -17,6 +17,7 @@
 package com.example.android.guesstheword.screens.game
 
 import android.os.Bundle
+import android.text.format.DateUtils
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
@@ -59,16 +60,17 @@ class GameFragment : Fragment() {
         }
 
         /** Setting up LiveData observation relationship **/
-        viewModel.word.observe(this, Observer { newWord ->
+        viewModel.word.observe(this.viewLifecycleOwner, Observer { newWord ->
             binding.wordText.text = newWord
         })
 
-        viewModel.score.observe(this, Observer { newScore ->
+        viewModel.score.observe(viewLifecycleOwner, Observer { newScore ->
             binding.scoreText.text = newScore.toString()
         })
 
-        // TODO (07) Setup an observer relationship to update binding.timerText
-        // You can use DateUtils.formatElapsedTime to correctly format the long to a time string
+        viewModel.currentTime.observe(viewLifecycleOwner, Observer { newTime ->
+            binding.timerText.text = DateUtils.formatElapsedTime(newTime / 1000)
+        })
 
         // Sets up event listening to navigate the player when the game is finished
         viewModel.eventGameFinish.observe(viewLifecycleOwner, Observer { isFinished ->
@@ -79,9 +81,6 @@ class GameFragment : Fragment() {
                 viewModel.onGameFinishComplete()
             }
         })
-
         return binding.root
-
     }
-
 }

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

@@ -16,6 +16,7 @@
 
 package com.example.android.guesstheword.screens.game
 
+import android.os.CountDownTimer
 import androidx.lifecycle.LiveData
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
@@ -26,12 +27,17 @@ import androidx.lifecycle.ViewModel
  */
 class GameViewModel : ViewModel() {
 
-    // TODO (01) Copy over the provided companion object with the timer constants
+    companion object {
+        private const val DONE = 0L
+        private const val SECOND = 1000L
+        private const val COUNTDOWN_TIME = 10000L
+    }
 
-    // TODO (02) Create a timer field of type CountDownTimer
+    private val timer: CountDownTimer
 
-    // TODO (03) Create a properly encapsulated LiveData for the current time called currentTime
-    // Its type should be Long
+    private val _currentTime = MutableLiveData<Long>()
+        val currentTime: LiveData<Long>
+            get() = _currentTime
 
     // The current word
     private val _word = MutableLiveData<String>()
@@ -57,9 +63,18 @@ class GameViewModel : ViewModel() {
         resetList()
         nextWord()
         _score.value = 0
+        _currentTime.value = COUNTDOWN_TIME
+
+        timer = object : CountDownTimer(COUNTDOWN_TIME, SECOND) {
+            override fun onTick(millisUntilFinished: Long) {
+                _currentTime.value = _currentTime.value?.minus(SECOND)
+            }
 
-        // TODO (04) Copy over the CountDownTimer code and then update currentTime and
-        // eventGameFinish appropriately as the timer ticks and finishes
+            override fun onFinish() {
+                _eventGameFinish.value = true
+            }
+        }
+        timer.start()
     }
 
     /**
@@ -96,14 +111,10 @@ class GameViewModel : ViewModel() {
      * Moves to the next word in the list
      */
     private fun nextWord() {
-        //Select and remove a word from the list
         if (wordList.isEmpty()) {
-            // TODO (05) Update this logic so that the game doesn't finish;
-            // Instead the list is reset and re-shuffled when you run out of words
-            _eventGameFinish.value = true
-        } else {
-            _word.value = wordList.removeAt(0)
+            resetList()
         }
+        _word.value = wordList.removeAt(0)
     }
 
     /** Methods for buttons presses **/
@@ -124,6 +135,8 @@ class GameViewModel : ViewModel() {
         _eventGameFinish.value = false
     }
 
-    // TODO (06) Cancel the timer in onCleared
-
+    override fun onCleared() {
+        super.onCleared()
+        timer.cancel()
+    }
 }