why getSpeed() always return 0 on android

Question

I need to get the speed and heading from the gps. However the only number i have from location.getSpeed() is 0 or sometimes not available. my code:

Answer 1

Imbru's answer looks really good, but it is not very helpful if you are working with units.

Here's what I did to calculate the speed in meters per second (m/s).

object : LocationListener() {
    var previousLocation: Location? = null

    override fun onLocationChanged(location: Location) {
        val speed = if (location.hasSpeed()) {
            location.speed
        } else {
            previousLocation?.let { lastLocation ->
                // Convert milliseconds to seconds
                val elapsedTimeInSeconds = (location.time - lastLocation.time) / 1_000.
                val distanceInMeters = lastLocation.distanceTo(location)
                // Speed in m/s
                distanceInMeters / elapsedTimeInSeconds
            } ?: 0.0
        }
        previousLocation = location

        /* There you have it, a speed value in m/s */
        functionThatUsesSpeedInMeterPerSecond(speed)

        . . .

    }

    . . .

}