Improve decimal number formatting

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

@@ -486,8 +486,8 @@ abstract class AbstractFileTrackImporter extends DefaultHandler implements Track
       latitudeValue = Double.parseDouble(latitude);
       longitudeValue = Double.parseDouble(longitude);
     } catch (NumberFormatException e) {
-      throw new SAXException(createErrorMessage(
-          String.format("Unable to parse latitude longitude: %s %s", latitude, longitude)), e);
+      throw new SAXException(createErrorMessage(String.format(
+          Locale.US, "Unable to parse latitude longitude: %s %s", latitude, longitude)), e);
     }
     Double altitudeValue = null;
     if (altitude != null) {
@@ -495,7 +495,8 @@ abstract class AbstractFileTrackImporter extends DefaultHandler implements Track
         altitudeValue = Double.parseDouble(altitude);
       } catch (NumberFormatException e) {
         throw new SAXException(
-            createErrorMessage(String.format("Unable to parse altitude: %s", altitude)), e);
+            createErrorMessage(String.format(Locale.US, "Unable to parse altitude: %s", altitude)),
+            e);
       }
     }
     
@@ -507,7 +508,7 @@ abstract class AbstractFileTrackImporter extends DefaultHandler implements Track
         timeValue = StringUtils.getTime(time);
       } catch (IllegalArgumentException e) {
         throw new SAXException(
-            createErrorMessage(String.format("Unable to parse time: %s", time)), e);
+            createErrorMessage(String.format(Locale.US, "Unable to parse time: %s", time)), e);
       }
     }
     return createLocation(latitudeValue, longitudeValue, altitudeValue, timeValue);

MyTracks/src/com/google/android/apps/mytracks/services/sensors/ant/AntSensorManager.java

@@ -38,6 +38,7 @@ import android.util.Log;
 import android.widget.Toast;
 
 import java.lang.reflect.Field;
+import java.util.Locale;
 
 /**
  * Ant Sensor Manager.
@@ -396,7 +397,8 @@ public class AntSensorManager extends SensorManager {
       if (channelConfig[channel].isInitializing()) {
         if (message[AntMesg.MESG_DATA_OFFSET + 2] != 0) {
           // Error response
-          Log.e(TAG, String.format("Error code(%#02x) on message ID(%#02x) on channel %d",
+          Log.e(TAG, String.format(Locale.US,
+              "Error code(%#02x) on message ID(%#02x) on channel %d",
               message[AntMesg.MESG_DATA_OFFSET + 2], message[AntMesg.MESG_DATA_OFFSET + 1],
               channel));
         } else {

MyTracks/src/com/google/android/apps/mytracks/util/StatsUtils.java

@@ -40,9 +40,8 @@ public class StatsUtils {
   private static final String COORDINATE_DEGREE = "\u00B0";
   private static final String GRADE_PERCENTAGE = "%";
 
-  private static final String ELEVATION_FORMAT = "%1$.2f";
   private static final String GRADE_FORMAT = "%1$d";
-  private static final String CALORIES_FORMAT = "%1$.0f";
+  private static final String CALORIES_FORMAT = "%1$,.0f";
 
   private StatsUtils() {}
 
@@ -282,11 +281,11 @@ public class StatsUtils {
       unit = null;
     } else {
       if (metricUnits) {
-        value = String.format(Locale.getDefault(), ELEVATION_FORMAT, elevation);
+        value = StringUtils.formatDecimal(elevation);
         unit = context.getString(R.string.unit_meter);
       } else {
         elevation *= UnitConversions.M_TO_FT;
-        value = String.format(Locale.getDefault(), ELEVATION_FORMAT, elevation);
+        value = StringUtils.formatDecimal(elevation);
         unit = context.getString(R.string.unit_feet);
       }
     }

MyTracks/src/com/google/android/apps/mytracks/util/StringUtils.java

@@ -148,6 +148,11 @@ public class StringUtils {
       }
     }
   }
+  
+  public static String formatDecimal(double value) {
+    String result = String.format(Locale.getDefault(), "%1$,.2f", value);
+    return result.endsWith(".00") ? result.substring(0, result.lastIndexOf('.')) : result;    
+  }
 
   /**
    * Gets the distance in an array of two strings. The first string is the
@@ -183,7 +188,7 @@ public class StringUtils {
         unitId = R.string.unit_feet;
       }
     }
-    result[0] = String.format("%.2f", distance);
+    result[0] = formatDecimal(distance);
     result[1] = context.getString(unitId);
     return result;
   }
@@ -217,13 +222,13 @@ public class StringUtils {
       speed *= UnitConversions.KM_TO_MI;
     }
     if (reportSpeed) {
-      result[0] = String.format("%.2f", speed);
+      result[0] = StringUtils.formatDecimal(speed);
     } else {
       // convert from hours to minutes
       double pace = speed == 0 ? 0.0 : 60.0 / speed;
       int minutes = (int) pace;
       int seconds = (int) Math.round((pace - minutes) * 60.0);
-      result[0] = String.format("%d:%02d", minutes, seconds);  
+      result[0] = String.format(Locale.US, "%d:%02d", minutes, seconds);  
     }
     return result;
   }