Save Logging Data to .csv and output

jjm345

Are there any examples of saving Log data to CSV and outputting to local directory? I have tried so many different things, and I cannot get it to work with the sensor.

I have a button that starts the logging and a button that stops the logging and downloads the entries. However, every time I try to integrate normal CSV writing that would be done in Java, it does not work. I have not found any examples online that work with the sensor. Log.i messages say that logging has started/stopped/downloaded, etc.

If anyone has information/code samples they could share, I would appreciate it. I have been at this for 2 weeks and it's making me super frustrated that I can't find a good example for logging. (I have found streaming examples, but they don't seem to work with logging.)

jjm345

For additional info - I used the Starter App (Android - Java) as to get going. Basic functionality is working as expected. My code for the Start / Stop / Info buttons is in the DeviceSetupActivityFragment.java. I tried to setup the CSV read / write similarly to this blog, which is out of date but should theoretically be easy to adapt. I feel like I am probably missing something obvious in the way the API works with Java, but I have no idea what. If anyone could point me to some code examples I would appreciate it. I have Googled, read Android docs, read the MBientlab docs and done the tutorials.

My Buttons are in the onViewCreated method

public class DeviceSetupActivityFragment extends Fragment implements ServiceConnection {
    public interface FragmentSettings {
        BluetoothDevice getBtDevice();
    }


    public DeviceSetupActivityFragment() {
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Activity owner = getActivity();
        if (!(owner instanceof FragmentSettings)) {
            throw new ClassCastException("Owning activity must implement the FragmentSettings interface");
        }

        settings = (FragmentSettings) owner;
        owner.getApplicationContext().bindService(new Intent(owner, BtleService.class), this, Context.BIND_AUTO_CREATE);

    }

    @Override
    public void onDestroy() {
        super.onDestroy();

        ///< Unbind the service when the activity is destroyed
        Objects.requireNonNull(getActivity()).getApplicationContext().unbindService(this);

    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        setRetainInstance(true);
        return inflater.inflate(R.layout.fragment_device_setup, container, false);
    }

   //cycle of data collection is supposed to happen here
    @Override
    public void onViewCreated(@NonNull View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        //get the date
        year = Calendar.getInstance().get(Calendar.YEAR);
        month = Calendar.getInstance().get(Calendar.MONTH) + 1;
        day = Calendar.getInstance().get(Calendar.DAY_OF_MONTH);

        //on-click listener for the logger for START button
        view.findViewById(R.id.acc_start);
        view.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //sets up a route with the log capability
                accelerometer.acceleration().addRouteAsync(new RouteBuilder() {
                    @Override
                    public void configure(RouteComponent source) {
                        source.log(new Subscriber() {
                            @Override
                            public void apply(Data data, Object... env) {
                                // Read Accel and Prepare for writing to CSV
                                final Acceleration value = data.value(Acceleration.class);
                                Log.i("accLog", value.x() + ":: " + value.y() + "::" + value.z());
                                Log.i("Data: ", data.toString());

                            }
                        });
                    }
                }).continueWith(task -> {


                    logging.start(false);
                    Log.i(LOG_KEY2, "Logging started.");

                    accelerometer.acceleration().start();
                    Log.i(LOG_KEY, "accelerator service started");

                    accelerometer.start();
                    Log.i(LOG_KEY, "sensor started");


                    return null;

                });
            }
        });

        //on-click listener for the STOP button
        view.findViewById(R.id.acc_stop);
        view.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //this is where the timer logic and download info needs to go
                //if stop button is pressed, end the Timer task, then do the following:

                logging.stop();
                Log.i(LOG_KEY, "Logging stopped.");

                accelerometer.stop();
                Log.i(LOG_KEY, "Sensor stop");

                accelerometer.acceleration().stop();
                Log.i(LOG_KEY, "Accel service stopped");


                logging.downloadAsync(100, (nEntriesLeft, totalEntries) -> {
                    Log.i("Logging", "Progress Update = " + nEntriesLeft + "/" + totalEntries);
                    Log.i("TEST1", accelStrX);
                }).continueWith((Continuation<Void, Void>) task -> {

                    if (task.isFaulted()) {
                        Log.e("Logging", "Error occurred");
                    } else {
                        Log.i("Logging", "Downloaded");
                    }
                    return null;
                });


                logging.clearEntries();
                metawear.tearDown();
            }
        });
        view.findViewById(R.id.show_info).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Snackbar.make(v, getString(R.string.info_snackbar), Snackbar.LENGTH_LONG)
                        .show();

            }
        });

    }

    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
        metawear = ((BtleService.LocalBinder) service).getMetaWearBoard(settings.getBtDevice());

        //retrieves a reference to the Accelerometer, Logging & Timer and configures the sensor
        try {
            accelerometer = metawear.getModule(Accelerometer.class);
            logging = metawear.getModule(Logging.class);
            timer = metawear.getModule(Timer.class);
            accelerometer.configure().odr(ACC_FREQ).range(ACC_RANGE).commit();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }


    @Override
    public void onServiceDisconnected(ComponentName name) {    }

      public void reconnected() {    }


}

Laura

Unfortunately saving data to files is not in the scope of the MetaWear APis. You just need to fine a proper tutorial on the net.
Shortly, I will be putting the MetaBase Java App source code online (on github). This does have a save file functionality which you can also look at.

jjm345

Thanks Laura. I'll keep plugging away at it in the meantime. I know it's something silly I'm missing as it usually is with coding.