Merge pull request #499 from fatihergin/fix/ISSUE-423-stopwatch-is-not-accurate

replace handler with timer for stopwatch tasks

app/src/main/kotlin/com/simplemobiletools/clock/fragments/StopwatchFragment.kt

@@ -199,13 +199,17 @@ class StopwatchFragment : Fragment() {
 
     private val updateListener = object : Stopwatch.UpdateListener {
         override fun onUpdate(totalTime: Long, lapTime: Long, useLongerMSFormat: Boolean) {
+            activity?.run {
                 updateDisplayedText(totalTime, lapTime, useLongerMSFormat)
             }
+        }
 
         override fun onStateChanged(state: Stopwatch.State) {
+            activity?.run {
                 updateIcons(state)
                 binding.stopwatchLap.beVisibleIf(state == Stopwatch.State.RUNNING)
                 binding.stopwatchReset.beVisibleIf(state != Stopwatch.State.STOPPED)
             }
         }
+    }
 }

app/src/main/kotlin/com/simplemobiletools/clock/helpers/Stopwatch.kt

@@ -1,16 +1,16 @@
 package com.simplemobiletools.clock.helpers
 
-import android.os.Handler
-import android.os.Looper
 import android.os.SystemClock
 import com.simplemobiletools.clock.models.Lap
+import java.util.Timer
+import java.util.TimerTask
 import java.util.concurrent.CopyOnWriteArraySet
 
 private const val UPDATE_INTERVAL = 10L
 
 object Stopwatch {
 
-    private val updateHandler = Handler(Looper.getMainLooper())
+    private var updateTimer = Timer()
     private var uptimeAtStart = 0L
     private var totalTicks = 0
     private var currentTicks = 0    // ticks that reset at pause
@@ -27,7 +27,7 @@ object Stopwatch {
     private var updateListeners = CopyOnWriteArraySet<UpdateListener>()
 
     fun reset() {
-        updateHandler.removeCallbacksAndMessages(null)
+        updateTimer.cancel()
         state = State.STOPPED
         currentTicks = 0
         totalTicks = 0
@@ -39,7 +39,7 @@ object Stopwatch {
     fun toggle(setUptimeAtStart: Boolean) {
         if (state != State.RUNNING) {
             state = State.RUNNING
-            updateHandler.post(updateRunnable)
+            updateTimer = buildUpdateTimer()
             if (setUptimeAtStart) {
                 uptimeAtStart = SystemClock.uptimeMillis()
             }
@@ -47,7 +47,7 @@ object Stopwatch {
             state = State.PAUSED
             val prevSessionsMS = (totalTicks - currentTicks) * UPDATE_INTERVAL
             val totalDuration = SystemClock.uptimeMillis() - uptimeAtStart + prevSessionsMS
-            updateHandler.removeCallbacksAndMessages(null)
+            updateTimer.cancel()
             currentTicks = 0
             totalTicks--
             for (listener in updateListeners) {
@@ -97,7 +97,9 @@ object Stopwatch {
         updateListeners.remove(updateListener)
     }
 
-    private val updateRunnable = object : Runnable {
+    private fun buildUpdateTimer(): Timer {
+        return Timer().apply {
+            scheduleAtFixedRate(object : TimerTask() {
                 override fun run() {
                     if (state == State.RUNNING) {
                         if (totalTicks % 10 == 0) {
@@ -112,9 +114,10 @@ object Stopwatch {
                         totalTicks++
                         currentTicks++
                         lapTicks++
-                updateHandler.postAtTime(this, uptimeAtStart + currentTicks * UPDATE_INTERVAL)
                     }
                 }
+            }, 0, UPDATE_INTERVAL)
+        }
     }
 
     enum class State {

app/src/main/kotlin/com/simplemobiletools/clock/services/StopwatchService.kt

@@ -9,6 +9,7 @@ import android.os.Handler
 import android.os.IBinder
 import android.os.Looper
 import androidx.core.app.NotificationCompat
+import androidx.core.app.ServiceCompat
 import androidx.core.content.ContextCompat
 import com.simplemobiletools.clock.R
 import com.simplemobiletools.clock.extensions.getFormattedDuration
@@ -18,7 +19,6 @@ import com.simplemobiletools.clock.helpers.Stopwatch
 import com.simplemobiletools.clock.helpers.Stopwatch.State
 import com.simplemobiletools.clock.helpers.Stopwatch.UpdateListener
 import com.simplemobiletools.commons.extensions.showErrorToast
-import com.simplemobiletools.commons.helpers.isNougatPlus
 import com.simplemobiletools.commons.helpers.isOreoPlus
 import org.greenrobot.eventbus.EventBus
 import org.greenrobot.eventbus.Subscribe
@@ -54,15 +54,15 @@ class StopwatchService : Service() {
     }
 
     override fun onDestroy() {
-        super.onDestroy()
         bus.unregister(this)
         Stopwatch.removeUpdateListener(updateListener)
+        super.onDestroy()
     }
 
     @Subscribe(threadMode = ThreadMode.MAIN)
     fun onMessageEvent(event: StopwatchStopService) {
         isStopping = true
-        stopForeground(true)
+        stopForegroundService()
     }
 
     private fun getServiceNotificationBuilder(
@@ -98,17 +98,29 @@ class StopwatchService : Service() {
     }
 
     private val updateListener = object : UpdateListener {
+        private val MIN_NOTIFICATION_UPDATE_INTERVAL = 500L
+        private var lastUpdateTime = 0L
         override fun onUpdate(totalTime: Long, lapTime: Long, useLongerMSFormat: Boolean) {
-            if (!isStopping) {
+            if (!isStopping && shouldNotificationBeUpdated()) {
+                lastUpdateTime = System.currentTimeMillis()
                 updateNotification(totalTime)
             }
         }
 
         override fun onStateChanged(state: State) {
-            if (state == State.STOPPED && isNougatPlus()) {
+            if (state == State.STOPPED) {
-                stopForeground(STOP_FOREGROUND_REMOVE)
+                stopForegroundService()
             }
         }
+
+        private fun shouldNotificationBeUpdated(): Boolean {
+            return (System.currentTimeMillis() - lastUpdateTime) > MIN_NOTIFICATION_UPDATE_INTERVAL
+        }
+    }
+
+    private fun stopForegroundService() {
+        ServiceCompat.stopForeground(this@StopwatchService, ServiceCompat.STOP_FOREGROUND_REMOVE)
+        stopSelf()
     }
 }