How do I retrieve step count data from Google Fitness REST api?

Question

Since I installed the Google Fit app on my Nexus 5 it has been tracking my step count and time spent walking. I\'d like to retrieve this info via the Google Fitness REST api

Answer 1

I tried post method with below URL & body. This will work, please check inline comments too.

Use URL: https://www.googleapis.com/fitness/v1/users/me/dataset:aggregate Method: POST Body:

    {
  "aggregateBy": [{
    "dataTypeName": "com.google.step_count.delta",
    "dataSourceId": "derived:com.google.step_count.delta:com.google.android.gms:estimated_steps"
  }],
  "bucketByTime": { "durationMillis": 86400000 }, // This is 24 hours
  "startTimeMillis": 1504137600000, //start time
  "endTimeMillis": 1504310400000 // End Time
}

Answer 2

It turns out that the answer is in the docs after all. Here is the format of the request.

GET https://www.googleapis.com/fitness/v1/users/{userId}/dataSources/{dataSourceId}/datasets/{datasetId}

The only supported {userId} value is me (with authentication).

Possible values for {dataSourceId} are avaiable by running a different request.

The bit I missed was that {datasetId} is not really an ID, but actually where you define the timespan in which you are interested. The format for that variable is {startTime}-{endTime} where the times are in nanoseconds since the epoch.

Answer 3

I was able to get this working by going through the google php client and noticed that they append their start and finish times for the GET request with extra 0's - nine infact.

Use the same GET request format as mentioned in an answer above:

https://www.googleapis.com/fitness/v1/users/{userId}/dataSources/{dataSourceId}/datasets/{datasetId}

Now here is an example with the unix timestamp (php's time() function uses this)

https://www.googleapis.com/fitness/v1/users/me/dataSources/derived:com.google.step_count.delta:com.google.android.gms:estimated_steps/datasets/1470475368-1471080168

This is the response I get:

{
  "minStartTimeNs": "1470475368", 
  "maxEndTimeNs": "1471080168", 
  "dataSourceId":
  "derived:com.google.step_count.delta:com.google.android.gms:estimated_steps
}

However if you append your start and finish times with nine 0's that you put in your GET requests and shape your request like this:

https://www.googleapis.com/fitness/v1/users/me/dataSources/derived:com.google.step_count.delta:com.google.android.gms:estimated_steps/datasets/1470475368000000000-1471080168000000000

It worked - this is the response I got:

{
  "minStartTimeNs": "1470475368000000000", 
  "maxEndTimeNs": "1471080168000000000", 
  "dataSourceId":
     "derived:com.google.step_count.delta:com.google.android.gms:estimated_steps", 

  "point": [
    {
      "modifiedTimeMillis": "1470804762704", 
      "startTimeNanos": "1470801347560000000", 
      "endTimeNanos": "1470801347567000000", 
      "value": [
        {
          "intVal": -3
        }
      ], 
      "dataTypeName": "com.google.step_count.delta", 
      "originDataSourceId":    "raw:com.google.step_count.delta:com.dsi.ant.plugins.antplus:AntPlus.0.124"
}, 

The response is a lot longer but I truncated it for the sake of this post. So when passing your datasets parameter into the request:

1470475368-1471080168 will not work, but 1470475368000000000-1471080168000000000 will.

This did the trick for me, hopes it helps someone!