google_maps_flutter_bug.dart

/// Copied from https://github.com/flutter/flutter/issues/33988#issuecomment-600748507
/// Steps to reproduce:
/// 1. Move the map location, bool value keeps changing.
/// 2. Tap on the container anywhere.
/// 3. Now again move the map.
/// 4. bool value does not change.(onCameraIdle() not working).
/// Occurs on google_maps_flutter:0.5.27


import 'package:flutter/material.dart';
import 'package:google_maps_flutter/google_maps_flutter.dart';

void main() => runApp(MyHomePage());

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  GoogleMapController mapController;

  final LatLng _center = const LatLng(45.521563, -122.677433);

  void _onMapCreated(GoogleMapController controller) {
    mapController = controller;
  }

  bool isCameraMoving;

  @override
  void initState() {
    super.initState();
    isCameraMoving = false;
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Maps POC App'),
        ),
        body: Stack(
          children: <Widget>[
            GoogleMap(
              onMapCreated: _onMapCreated,
              initialCameraPosition: CameraPosition(
                target: _center,
                zoom: 11.0,
              ),
              onCameraMove: (CameraPosition cameraPosition) {
                setState(() {
                  isCameraMoving = true;
                });
              },
              onCameraIdle: () {
                setState(() {
                  isCameraMoving = false;
                });
              },
            ),
            Positioned(
              top: 0,
              left: 0,
              right: 0,
              child: Padding(
                padding: const EdgeInsets.all(24.0),
                child: Container(
                  alignment: Alignment.center,
                  color: Colors.cyan,
                  height: 200,
                  child: Text(
                    'Camera moving: $isCameraMoving',
                    textAlign: TextAlign.center,
                    style: TextStyle(fontSize: 24, color: Colors.white),
                  ),
                ),
              ),
            )
          ],
        ),
      ),
    );
  }
}