requestLocation.kt

...
    try {
            fusedLocationProviderClient.requestLocationUpdates(
                locationRequest, locationCallback, Looper.myLooper())
        } catch (se: SecurityException) {
            Log.e(TAG, "Lost location permissions. Couldn't remove updates. $se")
            //Create a function to request necessary permissions from the app.
            
            checkAndStartLocationUpdates()
        }
   ...

private fun checkAndStartLocationUpdates(){
        if(ActivityCompat.checkSelfPermission(this,Manifest.permission.ACCESS_FINE_LOCATION)
            != PackageManager.PERMISSION_GRANTED){
            ActivityCompat.requestPermissions(
                this, //instance of current activity that is trying to subscribe to get location changes
                arrayOf(
                    Manifest.permission.ACCESS_COARSE_LOCATION,
                    Manifest.permission.ACCESS_FINE_LOCATION,
                    Manifest.permission.READ_EXTERNAL_STORAGE
                ),
                LOCATION_REQ  //A Constant showing the request to get access to location permissions
            )
        }else{
            //retry to subscribe to location changes
        }
    }

override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        if(requestCode == LOCATION_REQ){
            for(i in grantResults.indices){
                if (grantResults[i]!= PackageManager.PERMISSION_GRANTED){
                    Toast.makeText(this,"Please Give ${permissions[i]}",Toast.LENGTH_LONG).show()
                    return
                }
            }
            //retry to subscribe to location changes
        }
    }