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29 May 2016 09:39 AM

Total Posts: 6

Joined 2016-05-29

Hi. I'm developing an application in Java that reads and displays geographic data produced by an instrument (it has a GPS integrated). I would develop the export function in ".fit" format of such data to use them in lots free applications. I read this "ANT +" documentation and the sdk stuff, but i have a problem developing the following code. The file is correctly generated in ".fit" format, but this file is not compatible (no web or desktop application can read this data). it seems as if something was missing. into the SDK although there are some examples in Java but they are not clear. Thank you The code is this:

FileEncoder encode;
  try {
     encode = new FileEncoder(new java.io.File(file.getAbsolutePath()+".fit"), Fit.ProtocolVersion.V2_0);
  } catch (FitRuntimeException e) {
     System.err.println("Error opening file " + file.getName()+".fit");
     return;
  }

  //Generate FileIdMessage
  FileIdMesg fileIdMesg = new FileIdMesg(); // Every FIT file MUST contain a 'File ID' message as the first message
  fileIdMesg.setManufacturer(15);
  fileIdMesg.setType(com.garmin.fit.File.ACTIVITY);
  fileIdMesg.setProduct(4);
  fileIdMesg.setSerialNumber(1701L);
  fileIdMesg.setTimeCreated(new DateTime(systemStartTime.getTime()));
  fileIdMesg.setNumber(0);
encode.write(fileIdMesg); // Encode the FileIDMesg 

Then i found in Ant documentation this code... but i cannot undertand

byte[] appId = new byte[] {
     0x1, 0x1, 0x2, 0x3,
     0x5, 0x8, 0xD, 0x15,
     0x22, 0x37, 0x59, (byte)0x90,
     (byte)0xE9, 0x79, 0x62, (byte)0xDB
  };

  DeveloperDataIdMesg developerIdMesg = new DeveloperDataIdMesg();
  for(int i = 0; i < appId.length; i++)
  {
     developerIdMesg.setApplicationId(i, appId[i]);
  }
  developerIdMesg.setDeveloperDataIndex((short)0);
  encode.write(developerIdMesg);


  FieldDescriptionMesg fieldDescMesg = new FieldDescriptionMesg();
  fieldDescMesg.setDeveloperDataIndex((short)0);
  fieldDescMesg.setFieldDefinitionNumber((short)0);
  fieldDescMesg.setFitBaseTypeId((short)Fit.MAX_FIELD_SIZE);
  fieldDescMesg.setFieldName(0, "Myinstrument");
  fieldDescMesg.setUnits(0, "Myinstrument");
  encode.write(fieldDescMesg);

  RecordMesg record = new RecordMesg();
  DeveloperField doughnutsEarnedField = new DeveloperField(fieldDescMesg, developerIdMesg);
  record.addDeveloperField(doughnutsEarnedField);

//  This is my code added to try to record something.

 Date d=new Date();

 DateTime d2 =new DateTime(d.getTime());

  for (int ii=0;ii<ndatitot-2;ii++){

  record.timestampToDateTime((d.getTime()));
  record.setTimestamp(d2);
  record.setPositionLat(495280430+ii);
  record.setPositionLong(-872696681+ii);
  record.setHeartRate((short)140);
  record.setCadence((short)88);
  record.setDistance(2080f);
  record.setSpeed(2800f);

  doughnutsEarnedField.setValue(ii+1);

  encode.write(record); 

HELP ME PLEASE......

Thx!!!!!!

01 June 2016 03:53 PM #1

caufield Moderator

Total Posts: 68

Joined 0

The Base type you are using for your custom field is not valid


fieldDescMesg.setFitBaseTypeId((short)Fit.MAX_FIELD_SIZE));

The base type defines the number of bytes that are used in the file to record your data. And should be taken from

public class FitBaseType {
   public static final short ENUM = 0;
   public static final short SINT8 = 1;
   public static final short UINT8 = 2;
   public static final short SINT16 = 131;
   public static final short UINT16 = 132;
   public static final short SINT32 = 133;
   public static final short UINT32 = 134;
   public static final short STRING = 7;
   public static final short FLOAT32 = 136;
   public static final short FLOAT64 = 137;
   public static final short UINT8Z = 10;
   public static final short UINT16Z = 139;
   public static final short UINT32Z = 140;
   public static final short BYTE = 13;
   public static final short INVALID = Fit.UINT8_INVALID;
} 

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