Google fit API, onDatapoint method is not being invoked

问题

I am not able to get step count. I've been stuck on getting the onDataPoint method to be called. This code is almost correct. I am not able to find why it is not showing step count.

package com.example.akkisocc.heath;


import android.content.Intent;
import android.content.IntentSender;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.Scopes;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.ResultCallback;
import com.google.android.gms.common.api.Scope;
import com.google.android.gms.common.api.Status;
import com.google.android.gms.fitness.Fitness;
import com.google.android.gms.fitness.data.DataPoint;
import com.google.android.gms.fitness.data.DataSource;
import com.google.android.gms.fitness.data.DataType;
import com.google.android.gms.fitness.data.Field;
import com.google.android.gms.fitness.data.Value;
import com.google.android.gms.fitness.request.DataSourcesRequest;
import com.google.android.gms.fitness.request.OnDataPointListener;
import com.google.android.gms.fitness.request.SensorRequest;
import com.google.android.gms.fitness.result.DataSourcesResult;

import java.util.concurrent.TimeUnit;

public class MainActivity extends AppCompatActivity implements OnDataPointListener,
        GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener {
    private static final int REQUEST_OAUTH = 1;
    private static final String AUTH_PENDING = "auth_state_pending";
    TextView msg;
    private boolean authInProgress = false;
    private GoogleApiClient mApiClient;

    @Override
protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        msg = (TextView) findViewById(R.id.msg);
        msg.setText("On Create");
Log.e("GoogleFit", "Oncreate");

        if (savedInstanceState != null) {
            authInProgress = savedInstanceState.getBoolean(AUTH_PENDING);
        }

        mApiClient = new GoogleApiClient.Builder(this)
                .addApi(Fitness.SENSORS_API)
                .addScope(new Scope(Scopes.FITNESS_ACTIVITY_READ_WRITE))
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .build();
    }

    @Override
    protected void onStart() {
        super.onStart();
        mApiClient.connect();
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == REQUEST_OAUTH) {
            authInProgress = false;
            if (resultCode == RESULT_OK) {
                if (!mApiClient.isConnecting() && !mApiClient.isConnected()) {
                    mApiClient.connect();
                }
            } else if (resultCode == RESULT_CANCELED) {
                Log.e("GoogleFit", "RESULT_CANCELED");
            }
        } else {
            Log.e("GoogleFit", "requestCode NOT request_oauth");
        }
    }

    @Override
    public void onConnected(Bundle bundle) {
        DataSourcesRequest dataSourceRequest = new DataSourcesRequest.Builder()
                .setDataTypes(DataType.TYPE_STEP_COUNT_CUMULATIVE)
                .setDataSourceTypes(DataSource.TYPE_RAW)
                .build();

        ResultCallback<DataSourcesResult> dataSourcesResultCallback = new ResultCallback<DataSourcesResult>() {
            @Override
            public void onResult(DataSourcesResult dataSourcesResult) {
                for (DataSource dataSource : dataSourcesResult.getDataSources()) {
                    if (DataType.TYPE_STEP_COUNT_CUMULATIVE.equals(dataSource.getDataType())) {
                        registerFitnessDataListener(dataSource, DataType.TYPE_STEP_COUNT_CUMULATIVE);
                    }
                }
            }
        };

        Fitness.SensorsApi.findDataSources(mApiClient, dataSourceRequest)
                .setResultCallback(dataSourcesResultCallback);
    }

    @Override
    public void onConnectionSuspended(int i) {

    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {
        if (!authInProgress) {
            try {
                authInProgress = true;
                connectionResult.startResolutionForResult(MainActivity.this, REQUEST_OAUTH);
            } catch (IntentSender.SendIntentException e) {

            }
        } else {
            Log.e("GoogleFit", "authInProgress");
        }

    }

    private void registerFitnessDataListener(DataSource dataSource, DataType dataType) {

        SensorRequest request = new SensorRequest.Builder()
                .setDataSource(dataSource)
                .setDataType(dataType)
                .setSamplingRate(3, TimeUnit.SECONDS)
                .build();

        Fitness.SensorsApi.add(mApiClient, request, this)
                .setResultCallback(new ResultCallback<Status>() {
                    @Override
                    public void onResult(Status status) {
                        if (status.isSuccess()) {
                            Log.e("GoogleFit", "SensorApi successfully added");
                        }
                    }
                });
    }

    @Override
    public void onDataPoint(DataPoint dataPoint) {
        for (final Field field : dataPoint.getDataType().getFields()) {
            final Value value = dataPoint.getValue(field);
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    Toast.makeText(getApplicationContext(), "Field: " + field.getName() + " Value: " + value, Toast.LENGTH_SHORT).show();
                }
            });
        }
    }
}

回答1:

(As solved in the comments) The issue is that TYPE_STEP_COUNT_CUMULATIVE is not a raw data type—Google uses a combination of sensors, accelerometer, machine learning, etc. to determine step count. So the .setDataSourceTypes(DataSource.TYPE_RAW) line needs to be removed.

OP noticed that just removing the line gives less accurate results than replacing it with DataSource.TYPE_DERIVED.

Also, the Google Fit FAQ has an example which uses TYPE_DERIVED.

来源：https://stackoverflow.com/questions/38835281/google-fit-api-ondatapoint-method-is-not-being-invoked