@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
startTime = 0;
firstRun = true;
isRunning = false;
magneticFieldBias = new MagneticFieldBias();
try {
dataFileWriter =
new DataFileWriter(
FOLDER_NAME,
ExtraFunctions.arrayToList(DATA_FILE_NAMES),
ExtraFunctions.arrayToList(DATA_FILE_HEADINGS));
} catch (IOException e) {
e.printStackTrace();
}
sensorManager = (SensorManager) getActivity().getSystemService(Context.SENSOR_SERVICE);
sensorMagneticField = sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD_UNCALIBRATED);
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(getActivity());
alertDialogBuilder
.setMessage(DIALOG_MESSAGE)
.setNeutralButton(
"Start Calibration",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// this onClick() will be overridden during onStart()
}
});
return alertDialogBuilder.create();
}
@Override
public void onSensorChanged(SensorEvent event) {
if (firstRun) {
startTime = event.timestamp;
firstRun = false;
}
if (event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD_UNCALIBRATED) {
magneticFieldBias.calcBias(event.values);
// storing data to file
ArrayList<Float> dataValues = ExtraFunctions.arrayToList(event.values);
dataValues.add(0, (float) (event.timestamp - startTime));
dataFileWriter.writeToFile("Magnetic_Field_Uncalibrated", dataValues);
}
}
