Fix up double timer bug

app/src/main/java/com/danilafe/fencelessgrazing/CollarDetailActivity.kt

@@ -66,8 +66,6 @@ class CollarDetailActivity : AppCompatActivity() {
         mapMarker = Marker(map)
         configureMapPolygon()
 
-        refreshTimer.schedule(timerTask { triggerRefresh() }, 0L, 5000L)
-
         boundingBox = Polygon(
             listOf(
                 CollarPos("20", "20"),
@@ -82,6 +80,7 @@ class CollarDetailActivity : AppCompatActivity() {
         super.onPause()
         map.onPause()
         refreshTimer.cancel()
+        refreshTimer.purge()
     }
 
     override fun onResume() {

app/src/main/java/com/danilafe/fencelessgrazing/CollarListActivity.kt

@@ -3,6 +3,7 @@ package com.danilafe.fencelessgrazing
 import android.content.Intent
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
+import android.util.Log
 import android.widget.Toast
 import androidx.preference.PreferenceManager
 import androidx.recyclerview.widget.DividerItemDecoration
@@ -60,12 +61,15 @@ class CollarListActivity : AppCompatActivity() {
         map.onResume()
         refreshTimer = Timer()
         refreshTimer.schedule(timerTask { triggerRefresh() }, 0L, 5000L)
+        Log.d("FencelessGrazing", "Should be resumed")
     }
 
     override fun onPause() {
         super.onPause()
         map.onPause()
         refreshTimer.cancel()
+        refreshTimer.purge()
+        Log.d("FencelessGrazing", "Should be paused")
     }
 
     private fun triggerRefresh() {
@@ -107,7 +111,6 @@ class CollarListActivity : AppCompatActivity() {
         collarList.adapter = summaryAdapter
         collarList.layoutManager = layoutManager
         collarList.addItemDecoration(DividerItemDecoration(collarList.context, layoutManager.orientation))
-        refreshTimer.schedule(timerTask { triggerRefresh() }, 0L, 5000L)
     }
 
     private fun updateMapOverlay() {