Timezone support: store timezone offset per Track.

When a recording is started the offset of the phone is used.
Timezone is exported to KML and GPX.

Fixes #301.

src/androidTest/java/de/dennisguse/opentracks/io/file/exporter/KmlTrackExporterTest.java

@@ -1,5 +1,7 @@
 package de.dennisguse.opentracks.io.file.exporter;
 
+import static org.junit.Assert.assertEquals;
+
 import android.content.Context;
 
 import androidx.test.core.app.ApplicationProvider;
@@ -10,12 +12,11 @@ import org.junit.runners.JUnit4;
 
 import java.io.ByteArrayOutputStream;
 import java.time.Instant;
+import java.time.ZoneOffset;
 
 import de.dennisguse.opentracks.content.data.TrackPoint;
 import de.dennisguse.opentracks.io.file.TrackFileFormat;
 
-import static org.junit.Assert.assertEquals;
-
 @RunWith(JUnit4.class)
 public class KmlTrackExporterTest {
 
@@ -27,6 +28,8 @@ public class KmlTrackExporterTest {
     @Test
     public void writeCloseSegment_only_write_sensordata_if_present() {
         String expected = "<when>1970-01-01T00:00:00Z</when>\n" +
+                "<gx:coord/>\n" +
+                "<when>1970-01-01T01:00:00+01:00</when>\n" +
                 "<gx:coord/>\n" +
                 "<ExtendedData>\n" +
                 "<SchemaData schemaUrl=\"#schema\">\n" +
@@ -41,7 +44,8 @@ public class KmlTrackExporterTest {
         KMLTrackExporter kmlTrackWriter = (KMLTrackExporter) TrackFileFormat.KML_WITH_TRACKDETAIL_AND_SENSORDATA.createTrackExporter(context);
         kmlTrackWriter.prepare(outputStream);
 
-        kmlTrackWriter.writeTrackPoint(trackPoint);
+        kmlTrackWriter.writeTrackPoint(ZoneOffset.UTC, trackPoint);
+        kmlTrackWriter.writeTrackPoint(ZoneOffset.ofTotalSeconds(3600), trackPoint);
 
         // when
         kmlTrackWriter.writeCloseSegment();

src/androidTest/java/de/dennisguse/opentracks/io/file/importer/ExportImportTest.java

@@ -219,6 +219,7 @@ public class ExportImportTest {
         TrackStatistics importedTrackStatistics = importedTrack.getTrackStatistics();
 
         // Time
+        assertEquals(track.getZoneOffset(), importedTrack.getZoneOffset());
         assertEquals(Instant.parse("2020-02-02T02:02:02Z"), importedTrackStatistics.getStartTime());
         assertEquals(Instant.parse("2020-02-02T02:02:24Z"), importedTrackStatistics.getStopTime());
 
@@ -338,6 +339,7 @@ public class ExportImportTest {
         TrackStatistics importedTrackStatistics = importedTrack.getTrackStatistics();
 
         // Time
+        assertEquals(track.getZoneOffset(), importedTrack.getZoneOffset());
         assertEquals(Instant.parse("2020-02-02T02:02:03Z"), importedTrackStatistics.getStartTime());
         assertEquals(Instant.parse("2020-02-02T02:02:23Z"), importedTrackStatistics.getStopTime());
 

src/androidTest/java/de/dennisguse/opentracks/util/StringUtilsTest.java

@@ -16,6 +16,9 @@
 
 package de.dennisguse.opentracks.util;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
 import android.content.Context;
 
 import androidx.test.core.app.ApplicationProvider;
@@ -31,9 +34,6 @@ import java.util.TimeZone;
 import de.dennisguse.opentracks.content.data.Distance;
 import de.dennisguse.opentracks.content.data.Speed;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertTrue;
-
 /**
  * Tests for {@link StringUtils}.
  *
@@ -141,7 +141,7 @@ public class StringUtilsTest {
 
         // This comparision tends to be flaky (difference of 1ms)
         // Assert.assertEquals(calendar.getTimeInMillis(), StringUtils.parseTime(xmlDateTime));
-        assertTrue(calendar.getTimeInMillis() + " vs. " + StringUtils.parseTime(xmlDateTime), Math.abs(calendar.getTimeInMillis() - StringUtils.parseTime(xmlDateTime).toEpochMilli()) <= 1);
+        assertTrue(calendar.getTimeInMillis() + " vs. " + StringUtils.parseTime(xmlDateTime), Math.abs(calendar.getTimeInMillis() - StringUtils.parseTime(xmlDateTime).toInstant().toEpochMilli()) <= 1);
     }
 
     @Test