diff --git a/src/main/java/de/dennisguse/opentracks/ControllerFragment.java b/src/main/java/de/dennisguse/opentracks/ControllerFragment.java
index 3cfb98cfb..782481bf0 100644
--- a/src/main/java/de/dennisguse/opentracks/ControllerFragment.java
+++ b/src/main/java/de/dennisguse/opentracks/ControllerFragment.java
@@ -17,6 +17,7 @@
 package de.dennisguse.opentracks;
 
 import android.annotation.SuppressLint;
+import android.content.Context;
 import android.graphics.drawable.TransitionDrawable;
 import android.os.Bundle;
 import android.os.Handler;
@@ -97,7 +98,10 @@ public class ControllerFragment extends Fragment implements View.OnTouchListener
                 return;
             }
 
-            getCallback().recordStart();
+            Callback callback = (Callback) getContext();
+            if (callback != null) {
+                callback.recordStart();
+            }
         });
 
         viewBinding.controllerStop.setOnTouchListener(this);
@@ -114,6 +118,12 @@ public class ControllerFragment extends Fragment implements View.OnTouchListener
         trackRecordingServiceConnection.startConnection(getContext());
     }
 
+    @Override
+    public void onPause() {
+        super.onPause();
+        handlerUpdateTotalTime.removeCallbacksAndMessages(null);
+    }
+
     @Override
     public void onStop() {
         super.onStop();
@@ -175,7 +185,10 @@ public class ControllerFragment extends Fragment implements View.OnTouchListener
             buttonDelay = () -> {
                 view.sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);
                 view.performClick();
-                getCallback().recordPause();
+                Callback callback = (Callback) getContext();
+                if (callback != null) {
+                    callback.recordPause();
+                }
 
                 transition.resetTransition();
 
@@ -198,8 +211,12 @@ public class ControllerFragment extends Fragment implements View.OnTouchListener
 
             buttonDelay = () -> {
                 view.sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);
-                getCallback().recordStop();
-                ActivityUtils.vibrate(getContext(), 1000);
+                Context context = getContext();
+                Callback callback = (Callback) context;
+                if (callback != null) {
+                    callback.recordStop();
+                    ActivityUtils.vibrate(context, 1000);
+                }
 
                 transition.resetTransition();
             };
@@ -222,10 +239,6 @@ public class ControllerFragment extends Fragment implements View.OnTouchListener
         viewBinding.controllerStatus.setText(recordingStatus.isPaused() ? R.string.generic_paused : R.string.generic_recording);
     }
 
-    private Callback getCallback() {
-        return (Callback) getActivity();
-    }
-
     public interface Callback {
         void recordStart();
 
diff --git a/src/main/java/de/dennisguse/opentracks/TrackListActivity.java b/src/main/java/de/dennisguse/opentracks/TrackListActivity.java
index eda199175..96ec2a480 100644
--- a/src/main/java/de/dennisguse/opentracks/TrackListActivity.java
+++ b/src/main/java/de/dennisguse/opentracks/TrackListActivity.java
@@ -58,12 +58,12 @@ import de.dennisguse.opentracks.fragments.ConfirmDeleteDialogFragment;
 import de.dennisguse.opentracks.services.TrackRecordingService;
 import de.dennisguse.opentracks.services.TrackRecordingServiceConnection;
 import de.dennisguse.opentracks.services.handlers.GpsStatusValue;
+import de.dennisguse.opentracks.settings.PreferencesUtils;
 import de.dennisguse.opentracks.settings.SettingsActivity;
 import de.dennisguse.opentracks.util.ActivityUtils;
 import de.dennisguse.opentracks.util.IntentDashboardUtils;
 import de.dennisguse.opentracks.util.IntentUtils;
 import de.dennisguse.opentracks.util.ListItemUtils;
-import de.dennisguse.opentracks.settings.PreferencesUtils;
 import de.dennisguse.opentracks.util.StringUtils;
 import de.dennisguse.opentracks.util.TrackIconUtils;
 
@@ -248,6 +248,13 @@ public class TrackListActivity extends AbstractTrackDeleteActivity implements Co
         trackRecordingServiceConnection.unbind(this);
     }
 
+    @Override
+    protected void onDestroy() {
+        super.onDestroy();
+        viewBinding = null;
+        trackRecordingServiceConnection = null;
+    }
+
     @Override
     protected View getRootView() {
         viewBinding = TrackListBinding.inflate(getLayoutInflater());
diff --git a/src/main/java/de/dennisguse/opentracks/TrackRecordingActivity.java b/src/main/java/de/dennisguse/opentracks/TrackRecordingActivity.java
index 2749634bc..21f99abef 100644
--- a/src/main/java/de/dennisguse/opentracks/TrackRecordingActivity.java
+++ b/src/main/java/de/dennisguse/opentracks/TrackRecordingActivity.java
@@ -28,10 +28,10 @@ import de.dennisguse.opentracks.fragments.IntervalsFragment;
 import de.dennisguse.opentracks.fragments.StatisticsRecordingFragment;
 import de.dennisguse.opentracks.services.TrackRecordingService;
 import de.dennisguse.opentracks.services.TrackRecordingServiceConnection;
+import de.dennisguse.opentracks.settings.PreferencesUtils;
 import de.dennisguse.opentracks.settings.SettingsActivity;
 import de.dennisguse.opentracks.util.IntentDashboardUtils;
 import de.dennisguse.opentracks.util.IntentUtils;
-import de.dennisguse.opentracks.settings.PreferencesUtils;
 import de.dennisguse.opentracks.util.TrackIconUtils;
 import de.dennisguse.opentracks.util.TrackUtils;
 
@@ -232,6 +232,13 @@ public class TrackRecordingActivity extends AbstractActivity implements ChooseAc
         trackDataHub.stop();
     }
 
+    @Override
+    protected void onDestroy() {
+        super.onDestroy();
+        viewBinding = null;
+        trackRecordingServiceConnection = null;
+    }
+
     @Override
     protected View getRootView() {
         viewBinding = TrackRecordingBinding.inflate(getLayoutInflater());
diff --git a/src/main/java/de/dennisguse/opentracks/util/ActivityUtils.java b/src/main/java/de/dennisguse/opentracks/util/ActivityUtils.java
index c8a259eb1..00b574cad 100644
--- a/src/main/java/de/dennisguse/opentracks/util/ActivityUtils.java
+++ b/src/main/java/de/dennisguse/opentracks/util/ActivityUtils.java
@@ -1,5 +1,7 @@
 package de.dennisguse.opentracks.util;
 
+import static android.content.Context.VIBRATOR_SERVICE;
+
 import android.app.Activity;
 import android.app.SearchManager;
 import android.content.Context;
@@ -14,6 +16,7 @@ import android.view.MenuItem;
 import android.widget.AbsListView;
 import android.widget.ListView;
 
+import androidx.annotation.NonNull;
 import androidx.appcompat.widget.SearchView;
 
 import java.util.ArrayList;
@@ -21,8 +24,6 @@ import java.util.ArrayList;
 import de.dennisguse.opentracks.ContextualActionModeCallback;
 import de.dennisguse.opentracks.R;
 
-import static android.content.Context.VIBRATOR_SERVICE;
-
 public class ActivityUtils {
 
     private static final String TAG = ActivityUtils.class.getSimpleName();
@@ -75,11 +76,7 @@ public class ActivityUtils {
                         arrayList.add(key);
                     }
                 }
-                int[] result = new int[arrayList.size()];
-                for (int i = 0; i < arrayList.size(); i++) {
-                    result[i] = arrayList.get(i);
-                }
-                return result;
+                return arrayList.stream().mapToInt(i -> i).toArray();
             }
         });
     }
@@ -97,7 +94,7 @@ public class ActivityUtils {
         return searchView;
     }
 
-    public static void vibrate(Context context, int milliseconds) {
+    public static void vibrate(@NonNull Context context, int milliseconds) {
         final Vibrator vibrator = (Vibrator) context.getSystemService(VIBRATOR_SERVICE);
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
             vibrator.vibrate(VibrationEffect.createOneShot(milliseconds, VibrationEffect.DEFAULT_AMPLITUDE));