title: method distanceTo(double) is undefined
body: <p>I have a Problem to get the right way to get the distanceTo from my 2 Geo Points. How to get it work?</p>
  
  <p>from the gps class:</p>
  
  <pre><code>double latitude; // latitude
  String mlat;
  
      latitude = location.getLatitude();
      mlat = String.valueOf(latitude);
  </code></pre>
  
  <p>from the ListView:</p>
  
  <pre><code>                        // Get distance
                          String mReportA;
                          double mLocB;
                          int distance;
                          mReportA = e.getString("lat");
                          mReportA = e.getString("lon");
                          mLocB = gps.latitude;
                          mLocB = gps.longitude;
                          distance = mReportA.distanceTo(mLocB);
  </code></pre>
  
  <p>Error in Eclipse: The method <code>distanceTo(double)</code> is undefined for the type String
  I get <code>e.getString("lat");</code> from json</p>