Retrieve HR-bpm with Google-Fit sensor api

Question

I am using an external device which is suppose to send TYPE_HEART_RATE_BPM to the SENSORS_API. I can retrieve steps with this code:

Client

mClient = new GoogleApiClient.Builder(ApLifeAid.getAppContext())
            .addApi(Fitness.SENSORS_API)
            .addScope(new Scope(Scopes.FITNESS_ACTIVITY_READ))
            .addScope(new Scope(Scopes.FITNESS_ACTIVITY_READ_WRITE))
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .build();

Request

SensorRequest request = new SensorRequest.Builder()
            .setDataType(DataType.TYPE_STEP_COUNT_DELTA)
            .setSamplingRate(1, TimeUnit.SECONDS)
            .build();

And then using Fitness.SensorsApi.add(mClient, request, this);. In this case this is a class dedicated for sensor api in a service.

But I can't seem to get any values at all, onDataPoint() does not run, when I change my request to:

SensorRequest request = new SensorRequest.Builder()
            .setDataType(DataType.TYPE_HEART_RATE_BPM)
            .setSamplingRate(1, TimeUnit.SECONDS)
            .build();

If anybody knows what the problem is please tell me. And if you can see anything else that is weird in my code please tell me that too.

Thanks!

Answer 1

I found a solution. Apparently I need to find and then register the source I want the data to come from.

so I still use the "same" construction of the client, requests etc. but instead of using SensorsApi.add I use findDataSources. (Also, FITNESS_BODY_READ seemed more accurate and works well)

private void buildSensors() {
    mClient = new GoogleApiClient.Builder(ApLifeAid.getAppContext())
            .addApi(Fitness.SENSORS_API)
            .addScope(new Scope(Scopes.FITNESS_BODY_READ))
            .addScope(new Scope(Scopes.FITNESS_ACTIVITY_READ))
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .build();

    DataSourcesRequest dataSourcesRequest = new DataSourcesRequest.Builder()
            .setDataTypes(DataType.TYPE_HEART_RATE_BPM/*,
                    DataType.TYPE_STEP_COUNT_DELTA*/)
            .setDataSourceTypes(DataSource.TYPE_RAW) // data type, raw or derived?
            .build();

    Fitness.SensorsApi.findDataSources(mClient, dataSourcesRequest).setResultCallback(this);
}

The setResultCallback(this) then calls the following where I find an eligible source and add a listener and a sampling rate for it.

@Override
public void onResult(DataSourcesResult dataSourcesResult) {
    // On New Source Result
    for (final DataSource dataSource : dataSourcesResult.getDataSources()) {

        // Request updates from this source, samplingRate
        SensorRequest sensorRequest = new SensorRequest.Builder()
                .setDataSource(dataSource) // Optional but recommended for custom data sets.
                .setDataType(dataSource.getDataType()) // Can't be omitted.
                .setSamplingRate(1, TimeUnit.SECONDS)
                .build();

        Log.i(TAG, "Fitness.SensorsApi.add for " + dataSource.toString() + " and type " + dataSource.getDataType().getName());
        Fitness.SensorsApi.add(mClient, sensorRequest, this)
                //Can be removed later
                .setResultCallback(new ResultCallback<Status>() {
                    @Override
                    public void onResult(Status status) { // This might be important later on "Cannot register listener to source"
                        if (status.isSuccess()) {
                            Log.i(TAG, "Listener registered!");
                        } else {
                            Log.e(TAG, "Unable to register listener for source: " + dataSource.toString());
                        }
                    }
                });
    }
}

This is now the simplest and cleanest way of reading heart rate that I've found ;)