Get List of postal codes from visible region in google map android

Question

I hope you are doing good in your field.

Need some help for getting list of postal codes from the user visible area of google map for that i got the visible region. reference link for getting visible region

Now i am trying to get the address using Geocoder and visible region value but i get the exception.

Here i will show my code.[ Worked in Kotlin]

MainActivity.kt

import android.Manifest
import android.annotation.SuppressLint
import android.content.pm.PackageManager
import android.location.Geocoder
import android.os.Bundle
import android.support.v4.app.ActivityCompat
import android.support.v4.content.ContextCompat
import android.support.v7.app.AppCompatActivity
import com.google.android.gms.maps.CameraUpdateFactory
import com.google.android.gms.maps.GoogleMap
import com.google.android.gms.maps.OnMapReadyCallback
import com.google.android.gms.maps.SupportMapFragment
import com.google.android.gms.maps.model.LatLng


class MapActivity : AppCompatActivity(), OnMapReadyCallback {

    var map: SupportMapFragment? = null
    var googleMap: GoogleMap? = null
    var MY_LOCATION_REQUEST_CODE: Int = 201

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_map)
    }


    override fun onResume() {
        super.onResume()
        if (map == null) {
            map = supportFragmentManager.findFragmentById(R.id.map) as SupportMapFragment?
            map!!.getMapAsync(this)
        }
    }

    override fun onMapReady(googleMap: GoogleMap?) {
        this.googleMap = googleMap

        if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
                == PackageManager.PERMISSION_GRANTED) {

            googleMap!!.isMyLocationEnabled = true

            this.googleMap!!.animateCamera(CameraUpdateFactory.newLatLngZoom(LatLng(37.422, -122.084), 14.0f))

            getAddressListfromVisibleRegion()

        } else {
            ActivityCompat.requestPermissions(this, arrayOf(Manifest.permission.ACCESS_FINE_LOCATION), MY_LOCATION_REQUEST_CODE)
        }
    }

    private fun getAddressListfromVisibleRegion() {
        var vregion = googleMap!!.projection.visibleRegion.latLngBounds

        var addressList = Geocoder(this).getFromLocationName("", 100,
                vregion.southwest.latitude, vregion.southwest.longitude,
                vregion.northeast.latitude, vregion.northeast.longitude)

        /*

        val ne = vregion.northeast // LatLng of the north-east corner
        val sw = vregion.southwest // LatLng of the south-west corner
        val nw = LatLng(ne.latitude, sw.longitude)
        val se = LatLng(sw.latitude, ne.longitude)

        var addressList1 = Geocoder(this).getFromLocationName("", 100,
                nw.latitude, nw.longitude, se.latitude, se.longitude)

         */
    }


    @SuppressLint("MissingPermission")
    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
        if (requestCode == MY_LOCATION_REQUEST_CODE) {
            if (permissions.size == 1 &&
                    permissions[0] == Manifest.permission.ACCESS_FINE_LOCATION &&
                    grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                googleMap!!.isMyLocationEnabled = true
                this.googleMap!!.animateCamera(CameraUpdateFactory.newLatLngZoom(LatLng(37.422, -122.084), 14.0f))
            }
        }
    }
}

Got the exception when implement Geocoder

I was refered this link for above issue and also checked with real device but still face same issue when execute Geocoder statement.

Anyone want to share knowledge with me that will be good help for me

Thanks in advance.