Bug: StatisticsRecordingFragment: speed and location where sometimes 0.

Fixes #628.

src/main/java/de/dennisguse/opentracks/content/TrackDataHub.java

@@ -412,8 +412,10 @@ public class TrackDataHub implements SharedPreferences.OnSharedPreferenceChangeL
             lastSeenTrackPointId = localLastSeenTrackPointIdId;
         }
 
-        for (TrackDataListener listener : sampledInListeners) {
+        if (trackPoint != null) {
-            listener.onNewTrackPointsDone(trackPoint);
+            for (TrackDataListener listener : sampledInListeners) {
+                listener.onNewTrackPointsDone(trackPoint);
+            }
         }
     }
 

src/main/java/de/dennisguse/opentracks/content/TrackDataListener.java

@@ -16,7 +16,7 @@
 
 package de.dennisguse.opentracks.content;
 
-import androidx.annotation.Nullable;
+import androidx.annotation.NonNull;
 
 import de.dennisguse.opentracks.content.data.Marker;
 import de.dennisguse.opentracks.content.data.Track;
@@ -47,20 +47,20 @@ public interface TrackDataListener {
      *
      * @param trackPoint the trackPoint
      */
-    void onSampledInTrackPoint(TrackPoint trackPoint);
+    void onSampledInTrackPoint(@NonNull TrackPoint trackPoint);
 
     /**
      * Called when a sampled out track point is read.
      *
      * @param trackPoint the trackPoint
      */
-    void onSampledOutTrackPoint(TrackPoint trackPoint);
+    void onSampledOutTrackPoint(@NonNull TrackPoint trackPoint);
 
     /**
      * Called when finish sending new track points.
      * This gets called after every batch of calls to {@link #onSampledInTrackPoint(TrackPoint)} and {@link #onSampledOutTrackPoint(TrackPoint)}.
      */
-    void onNewTrackPointsDone(@Nullable TrackPoint lastTrackPoint);
+    void onNewTrackPointsDone(@NonNull TrackPoint lastTrackPoint);
 
     /**
      * Called to clear previously sent markers.

src/main/java/de/dennisguse/opentracks/fragments/ChartFragment.java

@@ -224,14 +224,14 @@ public class ChartFragment extends Fragment implements TrackDataListener {
     }
 
     @Override
-    public void onSampledInTrackPoint(TrackPoint trackPoint) {
+    public void onSampledInTrackPoint(@NonNull TrackPoint trackPoint) {
         if (isResumed()) {
             pendingPoints.add(createPendingPoint(trackPoint));
         }
     }
 
     @Override
-    public void onSampledOutTrackPoint(TrackPoint trackPoint) {
+    public void onSampledOutTrackPoint(@NonNull TrackPoint trackPoint) {
         if (isResumed()) {
             if (trackStatisticsUpdater != null) {
                 trackStatisticsUpdater.addTrackPoint(trackPoint, recordingDistanceInterval);
@@ -240,7 +240,7 @@ public class ChartFragment extends Fragment implements TrackDataListener {
     }
 
     @Override
-    public void onNewTrackPointsDone(TrackPoint unused) {
+    public void onNewTrackPointsDone(@NonNull TrackPoint unused) {
         if (isResumed()) {
             chartView.addChartPoints(pendingPoints);
             pendingPoints.clear();

src/main/java/de/dennisguse/opentracks/fragments/IntervalsFragment.java

@@ -198,21 +198,21 @@ public class IntervalsFragment extends Fragment implements TrackDataListener {
     }
 
     @Override
-    public void onSampledInTrackPoint(TrackPoint trackPoint) {
+    public void onSampledInTrackPoint(@NonNull TrackPoint trackPoint) {
         if (isResumed()) {
             viewModel.add(trackPoint);
         }
     }
 
     @Override
-    public void onSampledOutTrackPoint(TrackPoint trackPoint) {
+    public void onSampledOutTrackPoint(@NonNull TrackPoint trackPoint) {
         if (isResumed()) {
             viewModel.add(trackPoint);
         }
     }
 
     @Override
-    public void onNewTrackPointsDone(TrackPoint unused) {
+    public void onNewTrackPointsDone(@NonNull TrackPoint unused) {
         if (isResumed()) {
             runOnUiThread(this::loadIntervals);
         }

src/main/java/de/dennisguse/opentracks/fragments/StatisticsRecordingFragment.java

@@ -208,17 +208,17 @@ public class StatisticsRecordingFragment extends Fragment implements TrackDataLi
     }
 
     @Override
-    public void onSampledInTrackPoint(TrackPoint trackPoint) {
+    public void onSampledInTrackPoint(@NonNull TrackPoint trackPoint) {
         // We don't care.
     }
 
     @Override
-    public void onSampledOutTrackPoint(TrackPoint trackPoint) {
+    public void onSampledOutTrackPoint(@NonNull TrackPoint trackPoint) {
         // We don't care.
     }
 
     @Override
-    public void onNewTrackPointsDone(TrackPoint newLastTrackPoint) {
+    public void onNewTrackPointsDone(@NonNull TrackPoint newLastTrackPoint) {
         if (isResumed()) {
             getActivity().runOnUiThread(() -> {
                 if (isResumed()) {