Enable to edit timezone offset for recorded tracks.

Fixes #2014.

src/main/java/de/dennisguse/opentracks/TrackEditActivity.java

@@ -23,11 +23,14 @@ import android.widget.ArrayAdapter;
 
 import androidx.annotation.NonNull;
 
+import java.time.ZoneOffset;
+
 import de.dennisguse.opentracks.data.ContentProviderUtils;
 import de.dennisguse.opentracks.data.models.ActivityType;
 import de.dennisguse.opentracks.data.models.Track;
 import de.dennisguse.opentracks.databinding.TrackEditBinding;
 import de.dennisguse.opentracks.fragments.ChooseActivityTypeDialogFragment;
+import de.dennisguse.opentracks.ui.ZoneOffsetAdapter;
 import de.dennisguse.opentracks.util.TrackUtils;
 
 /**
@@ -71,7 +74,6 @@ public class TrackEditActivity extends AbstractActivity implements ChooseActivit
         viewBinding.trackEditName.setText(track.getName());
 
         viewBinding.trackEditActivityType.setText(track.getActivityTypeLocalized());
-
         ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_dropdown_item_1line, ActivityType.getLocalizedStrings(this));
         viewBinding.trackEditActivityType.setAdapter(adapter);
         viewBinding.trackEditActivityType.setOnItemClickListener((parent, view, position, id) -> {
@@ -92,12 +94,16 @@ public class TrackEditActivity extends AbstractActivity implements ChooseActivit
         if (activityType == null) {
             activityType = track.getActivityType();
         }
-
         setActivityTypeIcon(activityType);
         viewBinding.trackEditActivityTypeIcon.setOnClickListener(v -> ChooseActivityTypeDialogFragment.showDialog(getSupportFragmentManager(), this, viewBinding.trackEditActivityType.getText().toString()));
 
         viewBinding.trackEditDescription.setText(track.getDescription());
 
+        final ArrayAdapter<ZoneOffset> zoneOffsetAdapter = new ZoneOffsetAdapter(this, android.R.layout.simple_dropdown_item_1line);
+        viewBinding.trackEditTimeOffset.setText(track.getZoneOffset().toString());
+        viewBinding.trackEditTimeOffset.setAdapter(zoneOffsetAdapter);
+        viewBinding.trackEditTimeOffset.setOnItemClickListener((parent, view, position, id) -> track.setZoneOffset(zoneOffsetAdapter.getItem(position)));
+
         viewBinding.trackEditSave.setOnClickListener(v -> {
             TrackUtils.updateTrack(TrackEditActivity.this, track, viewBinding.trackEditName.getText().toString(),
                     viewBinding.trackEditActivityType.getText().toString(), viewBinding.trackEditDescription.getText().toString(),

src/main/java/de/dennisguse/opentracks/data/models/Track.java

@@ -48,7 +48,7 @@ public class Track {
 
     private ActivityType activityType;
 
-    private final ZoneOffset zoneOffset;
+    private ZoneOffset zoneOffset;
 
     private TrackStatistics trackStatistics = new TrackStatistics();
 
@@ -58,7 +58,7 @@ public class Track {
     }
 
     public Track(@NonNull ZoneOffset zoneOffset) {
-        this.zoneOffset = zoneOffset;
+        setZoneOffset(zoneOffset);
     }
 
     /**
@@ -117,6 +117,10 @@ public class Track {
         return zoneOffset;
     }
 
+    public void setZoneOffset(@NonNull ZoneOffset zoneOffset) {
+        this.zoneOffset = zoneOffset;
+    }
+
     public OffsetDateTime getStartTime() {
         return trackStatistics
                 .getStartTime().atOffset(zoneOffset);

src/main/java/de/dennisguse/opentracks/ui/ZoneOffsetAdapter.java

@@ -0,0 +1,19 @@
+package de.dennisguse.opentracks.ui;
+
+
+import android.content.Context;
+import android.widget.ArrayAdapter;
+
+import androidx.annotation.NonNull;
+
+import java.time.ZoneOffset;
+import java.util.stream.IntStream;
+
+public class ZoneOffsetAdapter extends ArrayAdapter<ZoneOffset> {
+    public ZoneOffsetAdapter(@NonNull Context context, int resource) {
+        super(context, resource, IntStream.range(-12, +12)
+                .boxed()
+                .map(ZoneOffset::ofHours)
+                .toList());
+    }
+}