Flutter集成高德地图定位组件

插件地址github：
https://github.com/fluttify-project/amap_location_fluttify
flutter pub:
https://pub.flutter-io.cn/packages/amap_location_fluttify

Flutter 签名方法（如果没有生成过签名文件，参考此文章）
https://www.jianshu.com/p/248eeb5d6535

Android Studio配置：
1.配置 android\app\src\main\AndroidManifest.xml文件
在AndroidManifest.xml的application标签中配置Key(这一步不要搞错了。是application标签中配置Key)：

<meta-data
    android:name="com.amap.api.v2.apikey"
    android:value="您的Key"/>

在AndroidManifest.xml中配置权限:

//地图包、搜索包需要的基础权限
     
<!--允许程序打开网络套接字-->
<uses-permission android:name="android.permission.INTERNET" />  
<!--允许程序设置内置sd卡的写权限-->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />    
<!--允许程序获取网络状态-->
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> 
<!--允许程序访问WiFi网络信息-->
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> 
<!--允许程序读写手机状态和身份-->
<uses-permission android:name="android.permission.READ_PHONE_STATE" />     
<!--允许程序访问CellID或WiFi热点来获取粗略的位置-->
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> 

开始安装：

dependencies:
  amap_location_fluttify: ^0.2.7+d2eb645

导入：

import 'package:amap_location_fluttify/amap_location_fluttify.dart';

使用：

await AmapCore.init('ios key');//IOS需要，安卓不需要

if (await requestPermission()) {
  await AmapLocation.startLocation(
    once: true,
    locationChanged: (location) {
      _location = location;
      setState(() {});
    },
  );
}

例子：

import 'package:amap_core_fluttify/amap_core_fluttify.dart';
import 'package:amap_location_fluttify/amap_location_fluttify.dart';
import 'package:decorated_flutter/decorated_flutter.dart';
import 'package:flutter/material.dart';
import 'package:permission_handler/permission_handler.dart';

void main() async {
  await AmapCore.init('f6422eadda731fb0d9ffb3260a5cf899');
  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> with AmapLocationDisposeMixin {
  Location _location;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: const Text('Plugin example app')),
        body: DecoratedColumn(
          padding: EdgeInsets.symmetric(horizontal: kSpaceLarge),
          crossAxisAlignment: CrossAxisAlignment.stretch,
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            RaisedButton(
              child: Text('获取单次定位'),
              onPressed: () async {
                if (await requestPermission()) {
                  AmapLocation.startLocation(
                    once: true,
                    locationChanged: (location) {
                      _location = location;
                      setState(() {});
                    },
                  );
                }
              },
            ),
            RaisedButton(
              child: Text('获取连续定位'),
              onPressed: () async {
                if (await requestPermission()) {
                  AmapLocation.startLocation(
                    once: false,
                    locationChanged: (location) {
                      _location = location;
                      setState(() {});
                    },
                  );
                }
              },
            ),
            RaisedButton(
              child: Text('停止定位'),
              onPressed: () async {
                if (await requestPermission()) {
                  await AmapLocation.stopLocation();
                }
              },
            ),
            if (_location != null)
              FutureBuilder<String>(
                initialData: '',
                future: _location.address,
                builder: (_, ss) =>
                    Center(child: Text('address: ${ss.data}' ?? '')),
              ),
            if (_location != null)
              FutureBuilder<String>(
                initialData: '',
                future: _location.country,
                builder: (_, ss) =>
                    Center(child: Text('country: ${ss.data}' ?? '')),
              ),
            if (_location != null)
              FutureBuilder<String>(
                initialData: '',
                future: _location.province,
                builder: (_, ss) =>
                    Center(child: Text('province: ${ss.data}' ?? '')),
              ),
            if (_location != null)
              FutureBuilder<String>(
                initialData: '',
                future: _location.city,
                builder: (_, ss) =>
                    Center(child: Text('city: ${ss.data}' ?? '')),
              ),
            if (_location != null)
              FutureBuilder<String>(
                initialData: '',
                future: _location.district,
                builder: (_, ss) =>
                    Center(child: Text('district: ${ss.data}' ?? '')),
              ),
            if (_location != null)
              FutureBuilder<String>(
                initialData: '',
                future: _location.poiName,
                builder: (_, ss) =>
                    Center(child: Text('poiName: ${ss.data}' ?? '')),
              ),
            if (_location != null)
              FutureBuilder<String>(
                initialData: '',
                future: _location.street,
                builder: (_, ss) =>
                    Center(child: Text('street: ${ss.data}' ?? '')),
              ),
            if (_location != null)
              FutureBuilder<String>(
                initialData: '',
                future: _location.aoiName,
                builder: (_, ss) =>
                    Center(child: Text('aoiName: ${ss.data}' ?? '')),
              ),
            if (_location != null)
              FutureBuilder<double>(
                initialData: 0.0,
                future: _location.latitude,
                builder: (_, ss) =>
                    Center(child: Text('latitude: ${ss.data}' ?? '')),
              ),
            if (_location != null)
              FutureBuilder<double>(
                initialData: 0.0,
                future: _location.longitude,
                builder: (_, ss) =>
                    Center(child: Text('longitude: ${ss.data}' ?? '')),
              ),
            if (_location != null)
              FutureBuilder<double>(
                initialData: 0.0,
                future: _location.altitude,
                builder: (_, ss) =>
                    Center(child: Text('altitude: ${ss.data}' ?? '')),
              ),
          ],
        ),
      ),
    );
  }
}

Future<bool> requestPermission() async {
  final permissions =
      await PermissionHandler().requestPermissions([PermissionGroup.location]);

  if (permissions[PermissionGroup.location] == PermissionStatus.granted) {
    return true;
  } else {
    toast('需要定位权限!');
    return false;
  }
}