Display pace in mm:second format.

MyTracks/res/values/strings.xml

@@ -1974,7 +1974,7 @@ limitations under the License.
   </string>
   <string name="settings_stats_rate_title"
     translation_description="In the 'Stats' settings, the option to change the preferred rate,
-      either speed (mi/hr) or pace (hr/mi).
+      either speed (mi/hr) or pace (min/mi).
 
       Character limit: ~23 (1 line)">
     Preferred rate
@@ -2131,7 +2131,7 @@ limitations under the License.
     Moving time
   </string>
   <string name="stats_pace"
-    translation_description="In the 'Stats' page, the pace like hours per mile.
+    translation_description="In the 'Stats' page, the pace like minutes per mile.
 
       Character limit: ~23 (1 line)">
     Pace

MyTracks/src/com/google/android/apps/mytracks/content/DescriptionGeneratorImpl.java

@@ -219,6 +219,15 @@ public class DescriptionGeneratorImpl implements DescriptionGenerator {
   void writePace(double speed, StringBuilder builder, int resId, String lineBreak) {
     String[] paceInMetrics = StringUtils.getSpeedParts(context, speed, true, false);
     String[] paceInImperial = StringUtils.getSpeedParts(context, speed, false, false);
+
+    if (paceInMetrics[0] == null) {
+      paceInMetrics[0] = context.getString(R.string.value_unknown);
+    }
+
+    if (paceInImperial[0] == null) {
+      paceInImperial[0] = context.getString(R.string.value_unknown);
+    }
+
     builder.append(context.getString(resId, paceInMetrics[0], paceInImperial[0]));
     builder.append(lineBreak);
   }

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

@@ -213,19 +213,18 @@ public class StringUtils {
       return result;
     }
     speed *= UnitConversions.MS_TO_KMH;
-    if (metricUnits) {
+    if (!metricUnits) {
-      if (!reportSpeed) {
-        // convert from hours to minutes
-        speed = speed == 0 ? 0.0 : 60.0 / speed;
-      }
-    } else {
       speed *= UnitConversions.KM_TO_MI;
-      if (!reportSpeed) {
-        // convert from hours to minutes
-        speed = speed == 0 ? 0.0 : 60.0 / speed;
-      }
     }
-    result[0] = String.format("%.2f", speed);
+    if (reportSpeed) {
+      result[0] = String.format("%.2f", 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);  
+    }
     return result;
   }
 

MyTracksTest/src/com/google/android/apps/mytracks/content/DescriptionGeneratorImplTest.java

@@ -68,9 +68,9 @@ public class DescriptionGeneratorImplTest extends AndroidTestCase {
       + "Average speed: 120.00 km/h (74.6 mi/h)<br>"
       + "Average moving speed: 240.00 km/h (149.1 mi/h)<br>"
       + "Max speed: 360.00 km/h (223.7 mi/h)<br>"
-      + "Average pace: 0.50 min/km (0.80 min/mi)<br>"
+      + "Average pace: 0:30 min/km (0:48 min/mi)<br>"
-      + "Average moving pace: 0.25 min/km (0.40 min/mi)<br>"
+      + "Average moving pace: 0:15 min/km (0:24 min/mi)<br>"
-      + "Fastest pace: 0.17 min/km (0.27 min/mi)<br>"
+      + "Fastest pace: 0:10 min/km (0:16 min/mi)<br>"
       + "Max elevation: 550 m (1804 ft)<br>"
       + "Min elevation: -500 m (-1640 ft)<br>"
       + "Elevation gain: 6000 m (19685 ft)<br>"
@@ -103,9 +103,9 @@ public class DescriptionGeneratorImplTest extends AndroidTestCase {
       + "Average speed: 120.00 km/h (74.6 mi/h)\n"
       + "Average moving speed: 240.00 km/h (149.1 mi/h)\n"
       + "Max speed: 360.00 km/h (223.7 mi/h)\n"
-      + "Average pace: 0.50 min/km (0.80 min/mi)\n"
+      + "Average pace: 0:30 min/km (0:48 min/mi)\n"
-      + "Average moving pace: 0.25 min/km (0.40 min/mi)\n"
+      + "Average moving pace: 0:15 min/km (0:24 min/mi)\n"
-      + "Fastest pace: 0.17 min/km (0.27 min/mi)\n"
+      + "Fastest pace: 0:10 min/km (0:16 min/mi)\n"
       + "Max elevation: 550 m (1804 ft)\n"
       + "Min elevation: -500 m (-1640 ft)\n"
       + "Elevation gain: 6000 m (19685 ft)\n"
@@ -163,7 +163,7 @@ public class DescriptionGeneratorImplTest extends AndroidTestCase {
   public void testWritePace() {
     StringBuilder builder = new StringBuilder();
     descriptionGenerator.writePace(1.1, builder, R.string.description_average_pace, "\n");
-    assertEquals("Average pace: 15.15 min/km (24.38 min/mi)\n", builder.toString());
+    assertEquals("Average pace: 15:09 min/km (24:23 min/mi)\n", builder.toString());
   }
 
   /**