fl_amap 0.1.0

AMap location plugin for flutter, supports single positioning and continuous positioning

example/lib/main.dart

import 'dart:io';

import 'package:fl_amap/fl_amap.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:permission_handler/permission_handler.dart';

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  final bool? key = await setAMapKey(
      iosKey: 'e0e98395277890e48caa0c4bed423ead',
      androidKey: '77418e726d0eefc0ac79a8619b5f4d97');
  if (key != null && key) print('高德地图ApiKey设置成功');
  runApp(MaterialApp(
      debugShowCheckedModeBanner: false, title: 'FlAMap', home: Home()));
}

class Home extends StatefulWidget {
  @override
  _HomeState createState() => _HomeState();
}

class _HomeState extends State<Home> {
  bool isInit = false;
  late ValueNotifier<String> text = ValueNotifier<String>('未初始化');
  late ValueNotifier<AMapLocation?> locationState =
      ValueNotifier<AMapLocation?>(null);

  int i = 0;

  @override
  void initState() {
    super.initState();
  }

  Future<bool> get getPermissions async {
    if (Platform.isIOS) {
      if (!await requestPermissions(Permission.locationWhenInUse, '获取定位权限') ||
          !await requestPermissions(Permission.locationWhenInUse, '获取定位权限')) {
        show('未获取到定位权限');
        return false;
      }
      return true;
    } else if (Platform.isAndroid) {
      if (!await requestPermissions(Permission.location, '获取定位权限') ||
          !await requestPermissions(Permission.phone, '获取定位权限')) {
        show('未获取到定位权限');
        return false;
      }
      return true;
    }
    return false;
  }

  Future<void> get getLocation async {
    if (!isInit) {
      show('请先初始化定位');
      return;
    }
    if (!await getPermissions) return;
    locationState.value = await getAMapLocation(true);
  }

  Future<void> get init async {
    if (!await getPermissions) return;

    /// 初始化AMap
    final bool? data = await initAMap(AMapLocationOption());
    if (data != null && data) {
      isInit = true;
      show('初始化成功');
    }
  }

  @override
  Widget build(BuildContext context) => Scaffold(
      appBar: AppBar(title: const Text('高德地图定位')),
      body: Center(
          child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
            Padding(
                padding: const EdgeInsets.symmetric(horizontal: 10.0),
                child: ValueListenableBuilder<String>(
                    valueListenable: text,
                    builder: (_, String value, __) =>
                        Text(value, style: const TextStyle(fontSize: 20)))),
            const SizedBox(height: 30),
            ElevatedButton(
                onPressed: () => init, child: const Text('initAMap')),
            const SizedBox(height: 10),
            ElevatedButton(
                onPressed: () {
                  disposeAMap();
                  locationState.value = null;
                  isInit = false;
                  i = 0;
                  show('未初始化');
                },
                child: const Text('disposeAMap')),
            const SizedBox(height: 10),
            ElevatedButton(
                onPressed: () => getLocation, child: const Text('直接获取定位')),
            const SizedBox(height: 10),
            ElevatedButton(
                onPressed: startLocationState,
                child: const Text('开启监听定位')),
            const SizedBox(height: 10),
            ElevatedButton(
                onPressed: () {
                  if (!isInit) {
                    show('请先初始化定位');
                    return;
                  }
                  text.value = '定位监听关闭';
                  locationState.value = null;
                  i = 0;
                  stopAMapLocation();
                },
                child: const Text('关闭监听定位')),
            const SizedBox(height: 30),
            Padding(
                padding: const EdgeInsets.symmetric(horizontal: 10.0),
                child: ValueListenableBuilder<AMapLocation?>(
                    valueListenable: locationState,
                    builder: (_, AMapLocation? value, __) => Text(
                        getLocationStr(value),
                        style: const TextStyle(fontSize: 15))))
          ])));

  Future<void> startLocationState() async {
    if (!isInit) {
      show('请先初始化定位');
      return;
    }
    if (!await getPermissions) return;
    final bool? data = await startAMapLocationChange(
        onLocationChange: (AMapLocation location) {
      locationState.value = location;
      i += 1;
      text.value = '位置更新$i次';
    });
    show((data == null || !data) ? '开启失败' : '开启成功');
  }

  void show(String str) {
    text.value = str;
  }

  @override
  void dispose() {
    super.dispose();
  }

  String getLocationStr(AMapLocation? loc) {
    if (loc != null) {
      if (loc.isSuccess ?? false) {
        if (loc.hasAddress ?? false) {
          return '定位成功: \n时间${loc.timestamp ?? ''}\n经纬度:${loc.latitude ?? ''} ${loc.longitude}\n地址:${loc.formattedAddress ?? ''}\n城市:${loc.city ?? ''}\n省:${loc.province ?? ''}';
        } else {
          return '定位成功: \n时间${loc.timestamp ?? ''}\n经纬度:${loc.latitude ?? ''}'
              '  ${loc.longitude ?? ''}';
        }
      } else {
        return '定位失败: \n错误:{code=${loc.code ?? ''},\ndescription=${loc.description ?? ''}';
      }
    }
    return '正在定位';
  }
}

Future<bool> requestPermissions(Permission permission, String text) async {
  final PermissionStatus status = await permission.status;
  if (status != PermissionStatus.granted) {
    final Map<Permission, PermissionStatus> statuses =
        await <Permission>[permission].request();
    if (!(statuses[permission] == PermissionStatus.granted)) {
      openAppSettings();
    }
    return statuses[permission] == PermissionStatus.granted;
  }
  return true;
}