Save Logging Data to .csv and output

Comments

• jjm345

  June 2021

  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 I tried to setup the CSV read / write similarly to this blog, which is out of date but should theoretically be easy to adapt.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

  June 2021 edited June 2021

  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

  June 2021

  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.