mizutori

    override fun onStatusChanged(provider: String?, status: Int, extras: Bundle?) {
        if (provider == LocationManager.GPS_PROVIDER) {
            if (status == LocationProvider.OUT_OF_SERVICE) {
                notifyLocationProviderStatusUpdated(false)
            } else {
                notifyLocationProviderStatusUpdated(true)
            }
        }
    }

mizutori

val batteryInfoReceiver = object : BroadcastReceiver() {
    override fun onReceive(ctxt: Context, intent: Intent) {
        val batteryLevel = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0)
        val scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1)

        val batteryLevelScaled = batteryLevel / scale.toFloat()

        batteryLevelArray.add(Integer.valueOf(batteryLevel))
        batteryLevelScaledArray.add(java.lang.Float.valueOf(batteryLevelScaled))
        batteryScale = scale

mizutori

/* Kalman Filter */
var Qvalue: Float = 3.0f

val locationTimeInMillis = location.elapsedRealtimeNanos / 1000000
val elapsedTimeInMillis = locationTimeInMillis - runStartTimeInMillis

if (currentSpeed == 0.0f) {
    Qvalue = 3.0f //3 meters per second
} else {
    Qvalue = currentSpeed // meters per second

mizutori

@SuppressLint("NewApi")
private fun getLocationAge(newLocation: Location): Long {
    val locationAge: Long
    if (android.os.Build.VERSION.SDK_INT >= 17) {
        val currentTimeInMilli = SystemClock.elapsedRealtimeNanos() / 1000000
        val locationTimeInMilli = newLocation.elapsedRealtimeNanos / 1000000
        locationAge = currentTimeInMilli - locationTimeInMilli
    } else {
        locationAge = System.currentTimeMillis() - newLocation.time
    }

mizutori

private fun filterAndAddLocation(location: Location): Boolean {

    val age = getLocationAge(location)

    if (age > 5 * 1000) { //more than 5 seconds
        Log.d(LOG_TAG, "Location is old")
        oldLocationList.add(location)
        return false
    }

mizutori

override fun onLocationChanged(newLocation: Location?) {
    newLocation?.let{
        Log.d(LOG_TAG, "(" + it.latitude + "," + it.longitude + ")")

        gpsCount++

        if (isLogging) {
            //locationList.add(newLocation);
            filterAndAddLocation(it)
        }

mizutori

private fun zoomMapTo(location: Location) {
    val latLng = LatLng(location.latitude, location.longitude)
    try {
        map.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, 17.5f))
        this.didInitialZoom = true
        return
    } catch (e: Exception) {
        e.printStackTrace()
    }
}

mizutori

private fun zoomMapTo(location: Location) {
    val latLng = LatLng(location.latitude, location.longitude)

    if (this.didInitialZoom == false) {
        try {
            map.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, 17.5f))
            this.didInitialZoom = true
            return
        } catch (e: Exception) {
            e.printStackTrace()

mizutori

private fun addPolyline() {
    locationService?.locationList?.let{locationList ->

        runningPathPolyline?.let{
            val toLocation = locationList[locationList.size - 1]
            val to = LatLng(
                toLocation.latitude,
                toLocation.longitude
            )
            val points = it.points

mizutori

private fun drawUserPositionMarker(location: Location) {
    val latLng = LatLng(location.latitude, location.longitude)

    if (this.userPositionMarkerBitmapDescriptor == null) {
        userPositionMarkerBitmapDescriptor = BitmapDescriptorFactory.fromResource(R.drawable.user_position_point)
    }

    userPositionMarker?.let{
        it.setPosition(latLng)
    } ?: run{