Monday, 14 October 2019

Using Google Maps SDK For Android Using Kotlin.

We know that with the Maps SDK for Android, you can add maps based on Google Maps data to your application. The API automatically handles access to Google Maps servers, data downloading, map display, and response to map gestures. You can also use API calls to add markers, polygons, and overlays to a basic map, and to change the user's view of a particular map area. These objects provide additional information for map locations, and allow user interaction with the map.

Now, lets try the same with Kotlin,

Refer the below link for complete sample code:-

Download Sample Code

Have a look on few code snippets,

//MapsActivity.kt
 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
package com.elitetechnologies.googlemapkotlin

import android.content.pm.PackageManager
import android.graphics.Color
import android.location.Location
import android.os.Bundle
import android.support.v4.app.ActivityCompat
import android.support.v7.app.AppCompatActivity
import com.google.android.gms.location.FusedLocationProviderClient
import com.google.android.gms.location.LocationServices
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
import com.google.android.gms.maps.model.Marker
import com.google.android.gms.maps.model.MarkerOptions
import com.google.android.gms.maps.model.PolylineOptions



class MapsActivity : AppCompatActivity(), OnMapReadyCallback, GoogleMap.OnMarkerClickListener {
    companion object {
        private const val LOCATION_PERMISSION_REQUEST_CODE = 1
    }

    private lateinit var mMap: GoogleMap
    private lateinit var fusedLocationClient: FusedLocationProviderClient
    private lateinit var lastLocation: Location

    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)
        fusedLocationClient = LocationServices.getFusedLocationProviderClient(this)
    }

    /**
     * Manipulates the map once available.
     * This callback is triggered when the map is ready to be used.
     * This is where we can add markers or lines, add listeners or move the camera. In this case,
     * we just add a marker near Sydney, Australia.
     * If Google Play services is not installed on the device, the user will be prompted to install
     * it inside the SupportMapFragment. This method will only be triggered once the user has
     * installed Google Play services and returned to the app.
     */
    override fun onMapReady(googleMap: GoogleMap) {
        mMap = googleMap
        mMap.uiSettings.isZoomControlsEnabled = true
        mMap.setOnMarkerClickListener(this)
        setUpMap()
    }

    override fun onMarkerClick(p0: Marker?): Boolean {
        // Add a marker in Sydney and move the camera
        val sydney = LatLng(-34.0, 151.0)
        var marker = mMap.addMarker(MarkerOptions().position(sydney).title("Marker in Sydney"))
        marker.showInfoWindow()
        mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney))
        return true
    }

    private fun setUpMap() {
        if (ActivityCompat.checkSelfPermission( this,android.Manifest.permission.ACCESS_FINE_LOCATION ) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(
                this,
                arrayOf(android.Manifest.permission.ACCESS_FINE_LOCATION), LOCATION_PERMISSION_REQUEST_CODE
            )
        }

        mMap.isMyLocationEnabled = true
        fusedLocationClient.lastLocation.addOnSuccessListener(this) { location ->
            // Got last known location. In some rare situations this can be null.
            // 3
                lastLocation = location
                val currentLatLng = LatLng(location.latitude, location.longitude)
                mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(currentLatLng, 12f))

                val markerLocation = LatLng(location.latitude + 2, location.longitude)
                var marker = mMap.addMarker(MarkerOptions().position(markerLocation).title("marker postion"))
                marker.showInfoWindow()

                val polylineOptions = PolylineOptions()
                polylineOptions.add(currentLatLng)
                    .add(LatLng(location.latitude + 2, location.longitude))
                    .add(LatLng(-34.0, 151.0))
                    .width(5f)
                    .color(Color.RED)
                mMap.addPolyline(polylineOptions)
        }
    }
}
Tags: , , , , , , , , , ,

No comments:

Post a Comment

Subscribe to: Post Comments (Atom)