Kotlin Google Map Current Location
    Map Current Location

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
    implementation 'com.android.support:appcompat-v7:26.1.0'
    implementation 'com.google.android.gms:play-services-maps:11.8.0'
    compile 'com.google.android.gms:play-services-location:11.8.0'
    testImplementation 'junit:junit:4.12'
}

    
    AIzaSyCuxsZ0D73o-REPLACE-WITH-YOUR-API

package example.javatpoint.com.kotlingooglemapcurrentlocation

import android.content.pm.PackageManager
import android.location.Location
import android.os.Build
import android.os.Bundle
import android.support.v4.app.FragmentActivity
import android.support.v4.content.ContextCompat
import com.google.android.gms.common.ConnectionResult
import com.google.android.gms.common.api.GoogleApiClient
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.BitmapDescriptorFactory
import com.google.android.gms.maps.model.LatLng
import com.google.android.gms.maps.model.Marker
import com.google.android.gms.maps.model.MarkerOptions
import android.Manifest
import android.os.Looper
import android.widget.Toast
import com.google.android.gms.location.*
import com.google.android.gms.location.FusedLocationProviderClient
import com.google.android.gms.location.LocationCallback
import com.google.android.gms.location.LocationRequest
import com.google.android.gms.location.LocationServices


class MapsActivity : FragmentActivity(), OnMapReadyCallback, LocationListener,
        GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {

    private var mMap: GoogleMap? = null
    internal lateinit var mLastLocation: Location
    internal lateinit var mLocationResult: LocationRequest
    internal lateinit var mLocationCallback: LocationCallback
    internal var mCurrLocationMarker: Marker? = null
    internal var mGoogleApiClient: GoogleApiClient? = null
    internal lateinit var mLocationRequest: LocationRequest
    internal var mFusedLocationClient: FusedLocationProviderClient? = null


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_maps)
        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        val mapFragment = supportFragmentManager
                .findFragmentById(R.id.map) as SupportMapFragment
        mapFragment.getMapAsync(this)

    }

    override fun onMapReady(googleMap: GoogleMap) {
        mMap = googleMap

        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if (ContextCompat.checkSelfPermission(this,
                            Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
                buildGoogleApiClient()
                mMap!!.isMyLocationEnabled = true
            }
        } else {
            buildGoogleApiClient()
            mMap!!.isMyLocationEnabled = true
        }

    }

    @Synchronized
    protected fun buildGoogleApiClient() {
        mGoogleApiClient = GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API).build()
        mGoogleApiClient!!.connect()
    }

    override fun onConnected(bundle: Bundle?) {

        mLocationRequest = LocationRequest()
        mLocationRequest.interval = 1000
        mLocationRequest.fastestInterval = 1000
        mLocationRequest.priority = LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY
        if (ContextCompat.checkSelfPermission(this,
                        Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this)
            mFusedLocationClient?.requestLocationUpdates(mLocationRequest,mLocationCallback, Looper.myLooper())
        }
    }


    override fun onLocationChanged(location: Location) {

        mLastLocation = location
        if (mCurrLocationMarker != null) {
            mCurrLocationMarker!!.remove()
        }
        //Place current location marker
        val latLng = LatLng(location.latitude, location.longitude)
        val markerOptions = MarkerOptions()
        markerOptions.position(latLng)
        markerOptions.title("Current Position")
        markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN))
        mCurrLocationMarker = mMap!!.addMarker(markerOptions)

        //move map camera
        mMap!!.moveCamera(CameraUpdateFactory.newLatLng(latLng))
        mMap!!.animateCamera(CameraUpdateFactory.zoomTo(11f))

        //stop location updates
        if (mGoogleApiClient != null) {
            mFusedLocationClient?.removeLocationUpdates(mLocationCallback)
        }
    }

    override fun onConnectionFailed(connectionResult: ConnectionResult) {
        Toast.makeText(applicationContext,"connection failed", Toast.LENGTH_SHORT).show()
    }

    override fun onConnectionSuspended(p0: Int) {
        Toast.makeText(applicationContext,"connection suspended", Toast.LENGTH_SHORT).show()
    }
}