Export altitude only when it is defined

MyTracks/src/com/google/android/apps/mytracks/io/file/CsvTrackWriter.java

@@ -123,10 +123,10 @@ public class CsvTrackWriter implements TrackFormatWriter {
         waypoint.getDescription(),
         Double.toString(location.getLatitude()),
         Double.toString(location.getLongitude()),
-        Double.toString(location.getAltitude()),
-        Double.toString(location.getBearing()),
-        SHORT_FORMAT.format(location.getAccuracy()),
-        SHORT_FORMAT.format(location.getSpeed()),
+        getAltitude(location),
+        getBearing(location),
+        getAccuracy(location),
+        getSpeed(location),
         StringUtils.formatDateTimeIso8601(location.getTime()));
   }
 
@@ -196,16 +196,32 @@ public class CsvTrackWriter implements TrackFormatWriter {
         Integer.toString(pointIndex),
         Double.toString(location.getLatitude()),
         Double.toString(location.getLongitude()),
-        Double.toString(location.getAltitude()),
-        Double.toString(location.getBearing()),
-        SHORT_FORMAT.format(location.getAccuracy()),
-        SHORT_FORMAT.format(location.getSpeed()),
+        getAltitude(location),
+        getBearing(location),
+        getAccuracy(location),
+        getSpeed(location),
         StringUtils.formatDateTimeIso8601(location.getTime()),
         power,
         cadence,
         heartRate);
   }
-
+  
+  private String getAltitude(Location location) {
+    return location.hasAltitude() ? Double.toString(location.getAltitude()) : null;
+  }
+  
+  private String getBearing(Location location) {
+    return location.hasBearing() ? Double.toString(location.getBearing()) : null;
+  }
+  
+  private String getAccuracy(Location location) {
+    return location.hasAccuracy() ? SHORT_FORMAT.format(location.getAccuracy()) : null;
+  }
+  
+  private String getSpeed(Location location) {
+    return location.hasSpeed() ? SHORT_FORMAT.format(location.getSpeed()) : null;
+  }
+  
   /**
    * Writes a single line of a CSV file.
    *

MyTracks/src/com/google/android/apps/mytracks/io/file/GpxTrackWriter.java

@@ -138,7 +138,9 @@ public class GpxTrackWriter implements TrackFormatWriter {
   public void writeLocation(Location location) {
     if (printWriter != null) {
       printWriter.println("<trkpt " + formatLocation(location) + ">");
-      printWriter.println("<ele>" + ELEVATION_FORMAT.format(location.getAltitude()) + "</ele>");
+      if (location.hasAltitude()) {
+        printWriter.println("<ele>" + ELEVATION_FORMAT.format(location.getAltitude()) + "</ele>");
+      }
       printWriter.println(
           "<time>" + StringUtils.formatDateTimeIso8601(location.getTime()) + "</time>");
       printWriter.println("</trkpt>");
@@ -161,7 +163,9 @@ public class GpxTrackWriter implements TrackFormatWriter {
       Location location = waypoint.getLocation();
       if (location != null) {
         printWriter.println("<wpt " + formatLocation(location) + ">");
-        printWriter.println("<ele>" + ELEVATION_FORMAT.format(location.getAltitude()) + "</ele>");
+        if (location.hasAltitude()) {
+          printWriter.println("<ele>" + ELEVATION_FORMAT.format(location.getAltitude()) + "</ele>");
+        }
         printWriter.println(
             "<time>" + StringUtils.formatDateTimeIso8601(location.getTime()) + "</time>");
         printWriter.println("<name>" + StringUtils.formatCData(waypoint.getName()) + "</name>");

MyTracks/src/com/google/android/apps/mytracks/io/file/KmlTrackWriter.java

@@ -229,8 +229,7 @@ public class KmlTrackWriter implements TrackFormatWriter {
     if (printWriter != null) {
       printWriter.println(
           "<when>" + StringUtils.formatDateTimeIso8601(location.getTime()) + "</when>");
-      printWriter.println("<gx:coord>" + location.getLongitude() + " " + location.getLatitude()
-          + " " + location.getAltitude() + "</gx:coord>");
+      printWriter.println("<gx:coord>" + getCoordinates(location, " ") + "</gx:coord>");
       if (location instanceof MyTracksLocation) {
         SensorDataSet sensorDataSet = ((MyTracksLocation) location).getSensorDataSet();
         int power = -1;
@@ -302,12 +301,20 @@ public class KmlTrackWriter implements TrackFormatWriter {
       printWriter.println("<styleUrl>#" + styleName + "</styleUrl>");
       writeCategory(category);
       printWriter.println("<Point>");
-      printWriter.println("<coordinates>" + location.getLongitude() + "," + location.getLatitude()
-          + "," + location.getAltitude() + "</coordinates>");
+      printWriter.println("<coordinates>" + getCoordinates(location, ",") + "</coordinates>");
       printWriter.println("</Point>");
       printWriter.println("</Placemark>");
     }
   }
+  
+  private String getCoordinates(Location location, String separator) {
+    StringBuffer buffer = new StringBuffer();
+    buffer.append(location.getLongitude() + separator + location.getLatitude());
+    if (location.hasAltitude()) {
+      buffer.append(separator + location.getAltitude());
+    }
+    return buffer.toString();    
+  }
 
   /**
    * Writes the category.

MyTracks/src/com/google/android/apps/mytracks/io/file/TcxTrackWriter.java

@@ -204,7 +204,9 @@ public class TcxTrackWriter implements TrackFormatWriter {
       printWriter.println("<LatitudeDegrees>" + location.getLatitude() + "</LatitudeDegrees>");
       printWriter.println("<LongitudeDegrees>" + location.getLongitude() + "</LongitudeDegrees>");
       printWriter.println("</Position>");
-      printWriter.println("<AltitudeMeters>" + location.getAltitude() + "</AltitudeMeters>");
+      if (location.hasAltitude()) {
+        printWriter.println("<AltitudeMeters>" + location.getAltitude() + "</AltitudeMeters>");
+      }
 
       if (location instanceof MyTracksLocation) {
         SensorDataSet sensorDataSet = ((MyTracksLocation) location).getSensorDataSet();