我需要重复requestLocationUpdates还是只调用一次？

Question

我想使用JobService在后台频繁获取android用户的位置。我已实现FusedLocationApi，并致电FusedLocationApi.requestLocationUpdates来接收有关用户位置的更新。我是否需要频繁（例如，每隔30秒使用JobScheduler）调用此JobService？还是应该仅一次调用一次，并且requestLocationUpdates会重复执行任务本身？< / p>

public class LocationMonitoringService extends JobService implements
        GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener,
        LocationListener {

    private static final String TAG = LocationMonitoringService.class.getSimpleName();
    boolean isWorking = false;
    boolean jobCancelled = false;
    GoogleApiClient mLocationClient;
    LocationRequest mLocationRequest = new LocationRequest();

    @Override
    public boolean onStartJob(JobParameters jobParameters) {
        mLocationClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();
        mLocationRequest.setInterval(30000);
        mLocationRequest.setFastestInterval(5000);
        int priority = LocationRequest.PRIORITY_HIGH_ACCURACY;
        mLocationRequest.setPriority(priority);
        mLocationClient.connect();
        return true;
    }

    @Override
    public boolean onStopJob(JobParameters jobParameters) {
        Log.d(TAG, "Job cancelled before being completed.");
        jobCancelled = true;
        boolean needsReschedule = isWorking;
        jobFinished(jobParameters, needsReschedule);
        return needsReschedule;
    }

    /*
     * LOCATION CALLBACKS
     */
    @Override
    public void onConnected(Bundle dataBundle) {
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            return;
        }
        LocationServices.FusedLocationApi.requestLocationUpdates(mLocationClient, mLocationRequest, this);
        Log.d(TAG, "Connected to Google API");
    }

    @Override
    public void onConnectionSuspended(int i) {
        Log.d(TAG, "Connection suspended");
    }

    @Override
    public void onLocationChanged(Location location) {
        Log.d(TAG, "Location changed");

        if (location != null) {
            Log.d(TAG, "== location != null");
            //Send result to Server
        }
    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {
        Log.d(TAG, "Failed to connect to Google API");

    }
}