amap_location/lib/amap_location.dart

import 'dart:async';
import 'dart:convert';
import 'dart:io';

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

import 'amap_marker.dart';
import 'location_option.dart';
import 'location_result_entity.dart';

// IOS:
// add info.plist GaoDeAppKey
class AmapLocation {
  static const MethodChannel _channel = const MethodChannel('amap_location');
  static final AmapLocation _instance = AmapLocation();

  static AmapLocation get instance => _instance;

  StreamController _locationStreamController;

  Stream<LocationResultEntity> get locationStream =>
      _locationStreamController.stream;


  AmapLocation() {
    _channel.setMethodCallHandler(platformCallHandler);
    _locationStreamController =
        StreamController<LocationResultEntity>.broadcast();
  }

  static Future<String> get platformVersion async {
    final String version = await _channel.invokeMethod('getPlatformVersion');
    return version;
  }

  Future<void> startLocation({LocationOption options}) async {
    if (_locationStreamController == null) {
      _locationStreamController =
          StreamController<LocationResultEntity>.broadcast();
    }
    return await _channel.invokeMethod(
        'startLocation', options?.toMap() ?? LocationOption().toMap());
  }

  Future<void> disposed() async {
    if (!_locationStreamController.isClosed) {
      await _locationStreamController.close();
    }
    return await _channel.invokeMethod("closeLocation");
  }

  Future<void> platformCallHandler(MethodCall call) async {
    try {
      if (call.method == "location") {
        LocationResultEntity entity =
            LocationResultEntity().fromJson(jsonDecode(call.arguments));
        _locationStreamController.add(entity);
      }
    } catch (ex) {
      print('Unexpected error: $ex');
    }
    return null;
  }
}