WIP save timerFragment state

app/src/main/java/com/paktalin/quickmax/TaskActivity.kt

@@ -3,6 +3,8 @@ package com.paktalin.quickmax
 import android.content.Intent
 import android.os.Bundle
 import androidx.appcompat.app.AppCompatActivity
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.commit
 import com.paktalin.quickmax.answers.Answer
 import com.paktalin.quickmax.answers.AnswerSet
 import kotlinx.android.synthetic.main.activity_task.*
@@ -14,6 +16,8 @@ class TaskActivity : AppCompatActivity() {
     private var millisToSolve: Long = 4000
     private var numDigits: Int = 3
 
+    private var timerFragment: Fragment? = null
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_task)
@@ -26,12 +30,18 @@ class TaskActivity : AppCompatActivity() {
                 )
             )
         }
-        retrieveExtras()
-        startNewRound()
+
+        if (savedInstanceState != null)
+            timerFragment = supportFragmentManager.getFragment(savedInstanceState, "timer_fragment")
+        else {
+            retrieveExtras()
+            startNewRound()
+        }
     }
 
     override fun onSaveInstanceState(outState: Bundle) {
         super.onSaveInstanceState(outState)
+        supportFragmentManager.putFragment(outState, "timer_fragment", timerFragment!!)
         // TODO save selection
         // TODO save animation state
         // TODO save timer
@@ -44,7 +54,13 @@ class TaskActivity : AppCompatActivity() {
             numDigits,
             listOf(card_left_top, card_right_top, card_left_bottom, card_right_bottom)
         )
-        addTimerFragment(supportFragmentManager, millisToSolve)
+        if (timerFragment == null)
+            timerFragment = TimerFragment().apply {
+                arguments = Bundle().apply { putLong("millis_to_solve", millisToSolve) }
+            }
+        supportFragmentManager.commit(true) {
+            replace(R.id.fragment_timer, timerFragment!!, "timer_fragment")
+        }
         setUpCards()
         removeButtonNextFragment(supportFragmentManager)
     }

app/src/main/java/com/paktalin/quickmax/TimerFragment.kt

@@ -16,11 +16,14 @@ import androidx.fragment.app.Fragment
 class TimerFragment: Fragment()  {
 
     private lateinit var timer: CountDownTimer
-    private var millisToSolve: Long = 0
-    private val interval: Long = 1000
     private lateinit var tvResponse: TextView
     private lateinit var colorAnimation: ValueAnimator
 
+    private var millisToSolve: Long = 0
+
+    private val interval: Long = 1000
+
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         millisToSolve = arguments!!.getLong("millis_to_solve")
@@ -29,15 +32,26 @@ class TimerFragment: Fragment()  {
     override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
         val view = inflater.inflate(R.layout.gradient_timer, container, false)
         tvResponse = view!!.findViewById(R.id.tv_response)
-        initTimer()
-        initColorAnimation()
+
+        if (savedInstanceState != null)
+            restoreState(savedInstanceState)
+        else {
+            initTimer()
+            initColorAnimation()
+        }
+
         return view
     }
 
     override fun onStart() {
         super.onStart()
         timer.start()
-        colorAnimation.start()
+//        colorAnimation.start()
+    }
+
+    override fun onSaveInstanceState(outState: Bundle) {
+        super.onSaveInstanceState(outState)
+        outState.putLong("millis_to_solve", millisToSolve)
     }
 
     fun cancelCorrect() {
@@ -50,6 +64,11 @@ class TimerFragment: Fragment()  {
         tvResponse.text = resources.getString(R.string.response_wrong)
     }
 
+    private fun restoreState(savedInstanceState: Bundle) {
+        millisToSolve = savedInstanceState.getLong("millis_to_solve")
+        initTimer()
+    }
+
     private fun cancel() {
         timer.cancel()
         colorAnimation.cancel()
@@ -59,13 +78,16 @@ class TimerFragment: Fragment()  {
     private fun initTimer() {
         timer = object : CountDownTimer(millisToSolve, interval) {
             override fun onTick(millisUntilFinished: Long) {
+                millisToSolve = millisUntilFinished
                 tvResponse.text = (millisUntilFinished / interval).toString()
             }
 
             override fun onFinish() {
-                tvResponse.setTextSize(TypedValue.COMPLEX_UNIT_SP, textSize(resources) )
-                tvResponse.text = resources.getString(R.string.time_is_over)
-                (activity as TaskActivity).onTimeOver()
+                if (isAdded) {
+                    tvResponse.setTextSize(TypedValue.COMPLEX_UNIT_SP, textSize(resources))
+                    tvResponse.text = resources.getString(R.string.time_is_over)
+                    (activity as TaskActivity).onTimeOver()
+                }
             }
         }
     }