Get Radius Of Visible Map in Android

Question

Is there any possible way of finding radius of the visible map from the middle point?

I

Answer 1

For the Kotlin users, call this function from setOnCameraIdleListener

private fun getMapVisibleRadius(): Double {
    val visibleRegion: VisibleRegion? = mMap?.projection?.visibleRegion

    val distanceWidth = FloatArray(1)
    val distanceHeight = FloatArray(1)

    val farRight: LatLng? = visibleRegion?.farRight
    val farLeft: LatLng? = visibleRegion?.farLeft
    val nearRight: LatLng? = visibleRegion?.nearRight
    val nearLeft: LatLng? = visibleRegion?.nearLeft

    Location.distanceBetween((farLeft!!.latitude + nearLeft!!.latitude) / 2,
            farLeft.longitude,
            (farRight!!.latitude + nearRight!!.latitude) / 2,
            farRight.longitude, distanceWidth)

    Location.distanceBetween(farRight.latitude,
            (farRight.longitude + farLeft.longitude) / 2,
            nearRight.latitude,
            (nearRight.longitude + nearLeft.longitude) / 2,
            distanceHeight)

    return Math.sqrt((Math.pow(distanceWidth[0].toString().toDouble(), 2.0))
            + Math.pow(distanceHeight[0].toString().toDouble(), 2.0)) / 2
}