Fix Map View to improve the initial camera position after screen rotation.

If showing a marker, after rotation, will zoom to the marker.
If showing a track, after rotation, will zoom to the current location
if is recording and is in tracking mode, else will zoom to the track.

MyTracksLib/src/com/google/android/apps/mytracks/content/MyTracksProviderUtils.java

@@ -252,6 +252,12 @@ public interface MyTracksProviderUtils {
    */
   public Location getLastValidTrackPoint(long trackId);
 
+  
+  /**
+   * Gets the last valid location.
+   */
+  public Location getLastValidTrackPoint();
+  
   /**
    * Creates a location cursor. The caller owns the returned cursor and is
    * responsible for closing it.

MyTracksLib/src/com/google/android/apps/mytracks/content/MyTracksProviderUtilsImpl.java

@@ -816,6 +816,14 @@ public class MyTracksProviderUtilsImpl implements MyTracksProviderUtils {
     return findTrackPointBy(selection, selectionArgs);
   }
 
+  @Override
+  public Location getLastValidTrackPoint() {
+    String selection = TrackPointsColumns._ID + "=(select max(" + TrackPointsColumns._ID + ") from "
+        + TrackPointsColumns.TABLE_NAME + " WHERE " + TrackPointsColumns.LATITUDE + "<="
+        + MAX_LATITUDE + ")";
+    return findTrackPointBy(selection, null);
+  }
+  
   @Override
   public Cursor getTrackPointCursor(
       long trackId, long startTrackPointId, int maxLocations, boolean descending) {