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만보기 class StepRecordHelper( private val callback: () -> Unit ): SensorEventListener { private var sensorManager: SensorManager? = null private var sensor: Sensor? = null fun start(context: Context) { sensorManager = context.getSystemService(Context.SENSOR_SERVICE) as SensorManager sensor = sensorManager?.getDefaultSensor(Sensor.TYPE_STEP_DETECTOR) sensorManager?.registerListener(this, sensor, Se..