map.view.dart

import 'dart:async';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:google_maps_flutter/google_maps_flutter.dart';
import 'package:location/location.dart';

class MapWidget extends StatefulWidget {
  _MapWidget createState() => _MapWidget();
}

class _MapWidget extends State<MapWidget> {
  LatLng _initialcameraposition = LatLng(20.5937, 78.9629);
  GoogleMapController _controller;
  Location _location = Location();

  void _onMapCreated(GoogleMapController _cntlr)
  {
    _controller = _cntlr;
    _location.onLocationChanged.listen((l) { 
      _controller.animateCamera(
        CameraUpdate.newCameraPosition(
          CameraPosition(target: LatLng(l.latitude, l.longitude),zoom: 15),
          ),
      );
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        height: MediaQuery.of(context).size.height,
        width: MediaQuery.of(context).size.width,
        child: Stack(
          children: [
            GoogleMap(
              initialCameraPosition: CameraPosition(target: _initialcameraposition),
              mapType: MapType.normal,
              onMapCreated: _onMapCreated,
              myLocationEnabled: true,
            ),
          ],
        ),
      ),
    );
  }
}