本节目标

百度地图业务
百度组件初始
编写定位代码 android 篇

环境

$ flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 1.20.1, on Mac OS X 10.15.6 19G73, locale zh-Hans-CN)
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
[✓] Xcode - develop for iOS and macOS (Xcode 11.6)
[✓] Android Studio (version 4.0)
[✓] VS Code (version 1.47.3)

视频

https://www.bilibili.com/vide...

代码

https://github.com/ducafecat/...

可以直接用 v1.0.3

https://github.com/ducafecat/...

正文

创建组件的几种方式

现成轮子直接用

官方仓库搜索
https://pub.dev/flutter/packages
https://pub.flutter-io.cn/flu...

可参考的组件代码

通过仓库，查找 github 代码仓
网站、客服索取代码

参考官方集成文档编写组件

官网文档

http://lbsyun.baidu.com/index...

组件代码

百度应用管理，创建 AK

应用管理

https://lbsyun.baidu.com/apic...

查询 SHA1

http://lbsyun.baidu.com/index...

keytool -list -v -keystore ~/.android/debug.keystore -alias androiddebugkey

设置 AK

example/android/app/src/main/AndroidManifest.xml

...

设置 Android 权限

文档

http://lbsyun.baidu.com/index...

android/src/main/AndroidManifest.xml

添加 android libs 库文件

android/build.gradle

...
android {
    compileSdkVersion 28

    sourceSets {
        main {
            jniLibs.srcDir 'libs'
        }
    }

    defaultConfig {
        minSdkVersion 16
    }
    lintOptions {
        disable 'InvalidPackage'
    }
}

dependencies {
    implementation files('libs/BaiduLBS_Android.jar')
}

编写 Flutter 组件代码

地理信息 lib/entity/flutter_baidu_location.dart

/// 百度定位结果类，用于存储各类定位结果信息
class BaiduLocation {
  /// 定位成功时间
  final String locTime;

  /// 定位结果类型
  final int locType;

  /// 半径
  final double radius;

  /// 纬度
  final double latitude;

  /// 经度
  final double longitude;

  /// 海拔
  final double altitude;

  /// 国家
  final String country;

  /// 省份
  final String province;

  /// 城市
  final String city;

  /// 区县
  final String district;

  /// 街道
  final String street;

  /// 地址
  final String address;

  /// 位置语义化描述，例如"在百度大厦附近"
  final String locationDetail;

  /// 周边poi信息，每个poi之间用"|"隔开

  final String poiList;

  /// 定位结果回调时间
  final String callbackTime;

  /// 错误码
  final int errorCode;

  /// 定位失败描述信息
  final String errorInfo;

  BaiduLocation(
      {this.locTime,
      this.locType,
      this.radius,
      this.latitude,
      this.longitude,
      this.altitude,
      this.country,
      this.province,
      this.city,
      this.district,
      this.street,
      this.address,
      this.locationDetail,
      this.poiList,
      this.callbackTime,
      this.errorCode,
      this.errorInfo});

  /// 根据传入的map生成BaiduLocation对象
  factory BaiduLocation.fromMap(dynamic value) {
    return new BaiduLocation(
      locTime: value['locTime'],
      locType: value['locType'],
      radius: value['radius'],
      latitude: value['latitude'],
      longitude: value['longitude'],
      altitude: value['altitude'],
      country: value['country'],
      province: value['province'],
      city: value['city'],
      district: value['district'],
      street: value['street'],
      address: value['address'],
      locationDetail: value['locationDetail'],
      poiList: value['poiList'],
      callbackTime: value['callbackTime'],
      errorCode: value['errorCode'],
      errorInfo: value['errorInfo'],
    );
  }

  /// 获取对本类所有变量赋值后的map键值对
  Map getMap() {
    return {
      "locTime": locTime,
      "locType": locType,
      "radius": radius,
      "latitude": latitude,
      "longitude": longitude,
      "altitude": altitude,
      "country": country,
      "province": province,
      "city": city,
      "district": district,
      "street": street,
      "address": address,
      "locationDescribe": locationDetail,
      "poiList": poiList,
      "callbackTime": callbackTime,
      "errorCode": errorCode,
      "errorInfo": errorInfo,
    };
  }
}

android 配置项 lib/entity/flutter_baidu_location_android_option.dart

/// 设置android端定位参数类
class BaiduLocationAndroidOption {
  /// 坐标系类型
  String coorType;

  /// 是否需要返回地址信息
  bool isNeedAddres;

  /// 是否需要返回海拔高度信息
  bool isNeedAltitude;

  /// 是否需要返回周边poi信息
  bool isNeedLocationPoiList;

  /// 是否需要返回新版本rgc信息
  bool isNeedNewVersionRgc;

  /// 是否需要返回位置描述信息
  bool isNeedLocationDescribe;

  /// 是否使用gps
  bool openGps;

  /// 可选，设置发起定位请求的间隔，int类型，单位ms
  /// 如果设置为0，则代表单次定位，即仅定位一次，默认为0
  /// 如果设置非0，需设置1000ms以上才有效
  int scanspan;

  /// 设置定位模式，可选的模式有高精度、仅设备、仅网络。默认为高精度模式
  int locationMode;

  /// 可选，设置场景定位参数，包括签到场景、运动场景、出行场景
  int locationPurpose;

  /// 可选，设置返回经纬度坐标类型，默认GCJ02
  /// GCJ02：国测局坐标；
  /// BD09ll：百度经纬度坐标；
  /// BD09：百度墨卡托坐标；
  /// 海外地区定位，无需设置坐标类型，统一返回WGS84类型坐标
  void setCoorType(String coorType) {
    this.coorType = coorType;
  }

  /// 是否需要返回地址信息
  void setIsNeedAddres(bool isNeedAddres) {
    this.isNeedAddres = isNeedAddres;
  }

  /// 是否需要返回海拔高度信息
  void setIsNeedAltitude(bool isNeedAltitude) {
    this.isNeedAltitude = isNeedAltitude;
  }

  /// 是否需要返回周边poi信息
  void setIsNeedLocationPoiList(bool isNeedLocationPoiList) {
    this.isNeedLocationPoiList = isNeedLocationPoiList;
  }

  /// 是否需要返回位置描述信息
  void setIsNeedLocationDescribe(bool isNeedLocationDescribe) {
    this.isNeedLocationDescribe = isNeedLocationDescribe;
  }

  /// 是否需要返回新版本rgc信息
  void setIsNeedNewVersionRgc(bool isNeedNewVersionRgc) {
    this.isNeedNewVersionRgc = isNeedNewVersionRgc;
  }

  /// 是否使用gps
  void setOpenGps(bool openGps) {
    this.openGps = openGps;
  }

  /// 可选，设置发起定位请求的间隔，int类型，单位ms
  /// 如果设置为0，则代表单次定位，即仅定位一次，默认为0
  /// 如果设置非0，需设置1000ms以上才有效
  void setScanspan(int scanspan) {
    this.scanspan = scanspan;
  }

  /// 设置定位模式，可选的模式有高精度、仅设备、仅网络，默认为高精度模式
  void setLocationMode(LocationMode locationMode) {
    if (locationMode == LocationMode.Hight_Accuracy) {
      this.locationMode = 1;
    } else if (locationMode == LocationMode.Device_Sensors) {
      this.locationMode = 2;
    } else if (locationMode == LocationMode.Battery_Saving) {
      this.locationMode = 3;
    }
  }

  /// 可选，设置场景定位参数，包括签到场景、运动场景、出行场景
  void setLocationPurpose(BDLocationPurpose locationPurpose) {
    if (locationPurpose == BDLocationPurpose.SignIn) {
      this.locationPurpose = 1;
    } else if (locationPurpose == BDLocationPurpose.Transport) {
      this.locationPurpose = 2;
    } else if (locationPurpose == BDLocationPurpose.Sport) {
      this.locationPurpose = 3;
    }
  }

  BaiduLocationAndroidOption(
      {this.coorType,
      this.isNeedAddres,
      this.isNeedAltitude,
      this.isNeedLocationPoiList,
      this.isNeedNewVersionRgc,
      this.openGps,
      this.isNeedLocationDescribe,
      this.scanspan,
      this.locationMode,
      this.locationPurpose});

  /// 根据传入的map生成BaiduLocationAndroidOption对象
  factory BaiduLocationAndroidOption.fromMap(dynamic value) {
    return new BaiduLocationAndroidOption(
      coorType: value['coorType'],
      isNeedAddres: value['isNeedAddres'],
      isNeedAltitude: value['isNeedAltitude'],
      isNeedLocationPoiList: value['isNeedLocationPoiList'],
      isNeedNewVersionRgc: value['isNeedNewVersionRgc'],
      openGps: value['openGps'],
      isNeedLocationDescribe: value[''],
      scanspan: value['scanspan'],
      locationMode: value['locationMode'],
      locationPurpose: value['LocationPurpose'],
    );
  }

  /// 获取对本类所有变量赋值后的map键值对
  Map getMap() {
    return {
      "coorType": coorType,
      "isNeedAddres": isNeedAddres,
      "isNeedAltitude": isNeedAltitude,
      "isNeedLocationPoiList": isNeedLocationPoiList,
      "isNeedNewVersionRgc": isNeedNewVersionRgc,
      "openGps": openGps,
      "isNeedLocationDescribe": isNeedLocationDescribe,
      "scanspan": scanspan,
      "locationMode": locationMode,
    };
  }
}

/// 定位模式枚举类
enum LocationMode {
  /// 高精度模式
  Hight_Accuracy,

  /// 低功耗模式
  Battery_Saving,

  /// 仅设备(Gps)模式
  Device_Sensors
}

/// 场景定位枚举类
enum BDLocationPurpose {
  ///  签到场景
  /// 只进行一次定位返回最接近真实位置的定位结果（定位速度可能会延迟1-3s）
  SignIn,

  /// 出行场景
  /// 高精度连续定位，适用于有户内外切换的场景，卫星定位和网络定位相互切换，卫星定位成功之后网络定位不再返回，卫星信号断开之后一段时间才会返回网络结果
  Sport,

  /// 运动场景
  /// 高精度连续定位，适用于有户内外切换的场景，卫星定位和网络定位相互切换，卫星定位成功之后网络定位不再返回，卫星信号断开之后一段时间才会返回网络结果
  Transport
}

ios 配置项 lib/entity/flutter_baidu_location_ios_option.dart

/// 设置ios端定位参数类
class BaiduLocationIOSOption {
  /// 设置位置获取超时时间
  int locationTimeout;

  /// 设置获取地址信息超时时间
  int reGeocodeTimeout;

  /// 设置应用位置类型
  String activityType;

  /// 设置返回位置的坐标系类型
  String BMKLocationCoordinateType;

  /// 设置预期精度参数
  String desiredAccuracy;

  /// 是否需要最新版本rgc数据
  bool isNeedNewVersionRgc;

  /// 指定定位是否会被系统自动暂停
  bool pausesLocationUpdatesAutomatically;

  /// 指定是否允许后台定位
  bool allowsBackgroundLocationUpdates;

  /// 设定定位的最小更新距离
  double distanceFilter;

  /// 指定是否允许后台定位
  /// allowsBackgroundLocationUpdates为true则允许后台定位
  /// allowsBackgroundLocationUpdates为false则不允许后台定位
  void setAllowsBackgroundLocationUpdates(
      bool allowsBackgroundLocationUpdates) {
    this.allowsBackgroundLocationUpdates = allowsBackgroundLocationUpdates;
  }

  /// 指定定位是否会被系统自动暂停
  /// pausesLocationUpdatesAutomatically为true则定位会被系统自动暂停
  /// pausesLocationUpdatesAutomatically为false则定位不会被系统自动暂停
  void setPauseLocUpdateAutomatically(bool pausesLocationUpdatesAutomatically) {
    this.pausesLocationUpdatesAutomatically =
        pausesLocationUpdatesAutomatically;
  }

  /// 设置位置获取超时时间
  void setLocationTimeout(int locationTimeout) {
    this.locationTimeout = locationTimeout;
  }

  /// 设置获取地址信息超时时间
  void setReGeocodeTimeout(int reGeocodeTimeout) {
    this.reGeocodeTimeout = reGeocodeTimeout;
  }

  /// 设置应用位置类型
  /// activityType可选值包括:
  /// "CLActivityTypeOther"
  /// "CLActivityTypeAutomotiveNavigation"
  /// "CLActivityTypeFitness"
  /// "CLActivityTypeOtherNavigation"
  void setActivityType(String activityType) {
    this.activityType = activityType;
  }

  /// 设置返回位置的坐标系类型
  /// BMKLocationCoordinateType可选值包括:
  /// "BMKLocationCoordinateTypeBMK09LL"
  /// "BMKLocationCoordinateTypeBMK09MC"
  /// "BMKLocationCoordinateTypeWGS84"
  /// "BMKLocationCoordinateTypeGCJ02"
  void setBMKLocationCoordinateType(String BMKLocationCoordinateType) {
    this.BMKLocationCoordinateType = BMKLocationCoordinateType;
  }

  /// 设置预期精度参数
  /// desiredAccuracy可选值包括:
  /// "kCLLocationAccuracyBest"
  /// "kCLLocationAccuracyNearestTenMeters"
  /// "kCLLocationAccuracyHundredMeters"
  /// "kCLLocationAccuracyKilometer"
  void setDesiredAccuracy(String desiredAccuracy) {
    this.desiredAccuracy = desiredAccuracy;
  }

  /// 设定定位的最小更新距离
  void setDistanceFilter(double distanceFilter) {
    this.distanceFilter = distanceFilter;
  }

  /// 是否需要最新版本rgc数据
  /// isNeedNewVersionRgc为true则需要返回最新版本rgc数据
  /// isNeedNewVersionRgc为false则不需要返回最新版本rgc数据
  void setIsNeedNewVersionRgc(bool isNeedNewVersionRgc) {
    this.isNeedNewVersionRgc = isNeedNewVersionRgc;
  }

  BaiduLocationIOSOption(
      {this.locationTimeout,
      this.reGeocodeTimeout,
      this.activityType,
      this.BMKLocationCoordinateType,
      this.desiredAccuracy,
      this.isNeedNewVersionRgc,
      this.pausesLocationUpdatesAutomatically,
      this.allowsBackgroundLocationUpdates,
      this.distanceFilter});

  /// 根据传入的map生成BaiduLocationIOSOption对象
  factory BaiduLocationIOSOption.fromMap(dynamic value) {
    return new BaiduLocationIOSOption(
      locationTimeout: value['locationTimeout'],
      reGeocodeTimeout: value['reGeocodeTimeout'],
      activityType: value['activityType'],
      BMKLocationCoordinateType: value['BMKLocationCoordinateType'],
      desiredAccuracy: value['desiredAccuracy'],
      isNeedNewVersionRgc: value['isNeedNewVersionRgc'],
      pausesLocationUpdatesAutomatically:
          value['pausesLocationUpdatesAutomatically'],
      allowsBackgroundLocationUpdates: value['allowsBackgroundLocationUpdates'],
      distanceFilter: value['distanceFilter'],
    );
  }

  /// 获取对本类所有变量赋值后的map键值对
  Map getMap() {
    return {
      "locationTimeout": locationTimeout,
      "reGeocodeTimeout": reGeocodeTimeout,
      "activityType": activityType,
      "BMKLocationCoordinateType": BMKLocationCoordinateType,
      "desiredAccuracy": desiredAccuracy,
      "isNeedNewVersionRgc": isNeedNewVersionRgc,
      "pausesLocationUpdatesAutomatically": pausesLocationUpdatesAutomatically,
      "allowsBackgroundLocationUpdates": allowsBackgroundLocationUpdates,
      "distanceFilter": distanceFilter,
    };
  }
}

接口 lib/flutter_baidu_plugin_ducafecat.dart

import 'dart:async';
import 'dart:io';
import 'package:flutter/services.dart';

class FlutterBaiduPluginDucafecat {
  /// flutter端主动调用原生端方法
  static const MethodChannel _channel =
      const MethodChannel('flutter_baidu_plugin_ducafecat');

  /// 原生端主动回传结果数据到flutter端
  static const EventChannel _stream =
      const EventChannel("flutter_baidu_plugin_ducafecat_stream");

  /// ios 下设置 key
  /// android 在 AndroidManifest.xml 中设置
  static Future setApiKey(String key) async {
    return await _channel.invokeMethod("setApiKey", key);
  }

  /// 设置定位参数
  void prepareLoc(Map androidMap, Map iosMap) {
    Map map;
    if (Platform.isAndroid) {
      map = androidMap;
    } else {
      map = iosMap;
    }
    _channel.invokeMethod("updateOption", map);
    return;
  }

  /// 启动定位
  void startLocation() {
    _channel.invokeMethod('startLocation');
    return;
  }

  /// 停止定位
  void stopLocation() {
    _channel.invokeMethod('stopLocation');
    return;
  }

  /// 原生端回传键值对map到flutter端
  /// map中key为isInChina对应的value，如果为1则判断是在国内，为0则判断是在国外
  /// map中存在key为nearby则判断为已到达设置监听位置附近
  Stream> onResultCallback() {
    Stream> _resultMap;
    if (_resultMap == null) {
      _resultMap = _stream.receiveBroadcastStream().map>(
          (element) => element.cast());
    }
    return _resultMap;
  }
}

触发 registerWith 的方式，老项目

// This static function is optional and equivalent to onAttachedToEngine. It supports the old
// pre-Flutter-1.12 Android projects. You are encouraged to continue supporting
// plugin registration via this function while apps migrate to use the new Android APIs
// post-flutter-1.12 via https://flutter.dev/go/androi...

android 组件代码

android/src/main/java/tech/ducafecat/flutter_baidu_plugin_ducafecat/FlutterBaiduPluginDucafecatPlugin.java

  public static void registerWith(Registrar registrar) {
    ......
  }

example android 注册组件

example/android/app/src/main/java/io/flutter/plugins/GeneratedPluginRegistrant.java

public final class GeneratedPluginRegistrant {
  public static void registerWith(PluginRegistry registry) {
    if (alreadyRegisteredWith(registry)) {
      return;
    }
    LocationFlutterPlugin.registerWith(registry.registrarFor("com.baidu.bdmap_location_flutter_plugin.LocationFlutterPlugin"));
    PermissionHandlerPlugin.registerWith(registry.registrarFor("com.baseflow.permissionhandler.PermissionHandlerPlugin"));
  }

  private static boolean alreadyRegisteredWith(PluginRegistry registry) {
    final String key = GeneratedPluginRegistrant.class.getCanonicalName();
    if (registry.hasPlugin(key)) {
      return true;
    }
    registry.registrarFor(key);
    return false;
  }
}

成员变量、同步、异步处理

MethodChannel 请求方法后，同步返回结果

EventChannel 组件主动推消息到 Flutter

android/src/main/java/tech/ducafecat/flutter_baidu_plugin_ducafecat/FlutterBaiduPluginDucafecatPlugin.java

用到的成员变量先定义下

public class FlutterBaiduPluginDucafecatPlugin implements FlutterPlugin, MethodCallHandler, EventChannel.StreamHandler {

  // 通道名称
  private static final String CHANNEL_METHOD_LOCATION = "flutter_baidu_plugin_ducafecat";
  private static final String CHANNEL_STREAM_LOCATION = "flutter_baidu_plugin_ducafecat_stream";

  private Context mContext = null; // flutter view context
  private LocationClient mLocationClient = null; // 定位对象
  private EventChannel.EventSink mEventSink = null; // 事件对象
  private BDNotifyListener mNotifyListener; // 位置提醒对象

  private boolean isPurporseLoc = false; // 签到场景
  private boolean isInChina = false;  // 是否启用国内外位置判断功能
  private boolean isNotify = false; // 位置提醒

  // 通道对象
  private MethodChannel channel = null;
  private EventChannel eventChannel = null;

组件生命周期

文件

android/src/main/java/tech/ducafecat/flutter_baidu_plugin_ducafecat/FlutterBaiduPluginDucafecatPlugin.java

组件注册 onAttachedToEngine

  @Override
  public void onAttachedToEngine(@NonNull FlutterPluginBinding flutterPluginBinding) {

    this.mContext = flutterPluginBinding.getApplicationContext();

    /**
     * 开始、停止定位
     */
    channel = new MethodChannel(flutterPluginBinding.getBinaryMessenger(), CHANNEL_METHOD_LOCATION);
    channel.setMethodCallHandler(this);

    /**
     * 监听位置变化
     */
    eventChannel = new EventChannel(flutterPluginBinding.getBinaryMessenger(), CHANNEL_STREAM_LOCATION);
    eventChannel.setStreamHandler(this);
  }

老项目组件注册 registerWith

  public static void registerWith(Registrar registrar) {

    FlutterBaiduPluginDucafecatPlugin plugin = new FlutterBaiduPluginDucafecatPlugin();
    plugin.mContext = registrar.context();

    /**
     * 开始、停止定位
     */
    final MethodChannel channel = new MethodChannel(registrar.messenger(), CHANNEL_METHOD_LOCATION);
    channel.setMethodCallHandler(plugin);

    /**
     * 监听位置变化
     */
    final EventChannel eventChannel = new EventChannel(registrar.messenger(), CHANNEL_STREAM_LOCATION);
    eventChannel.setStreamHandler(plugin);

//    final MethodChannel channel = new MethodChannel(registrar.messenger(), "flutter_baidu_plugin_ducafecat");
//    channel.setMethodCallHandler(new FlutterBaiduPluginDucafecatPlugin());
  }

注销组件 onCancel

  @Override
  public void onCancel(Object arguments) {
    stopLocation();
    if (isNotify) {
      if (null != mLocationClient) {
        mLocationClient.removeNotifyEvent(mNotifyListener);
      }
      mNotifyListener = null;
    }
  }

销毁组件 onDetachedFromEngine

  @Override
  public void onDetachedFromEngine(@NonNull FlutterPluginBinding binding) {
    channel.setMethodCallHandler(null);
    eventChannel.setStreamHandler(null);
  }

方法调用 onMethodCall

  @Override
  public void onMethodCall(@NonNull MethodCall call, @NonNull Result result) {
    if ("startLocation".equals(call.method)) {
      startLocation(); // 启动定位
    } else if ("stopLocation".equals(call.method)) {
      stopLocation(); // 停止定位
    } else if("updateOption".equals(call.method)) { // 设置定位参数
      try {
        updateOption((Map) call.arguments);
      } catch (Exception e) {
        e.printStackTrace();
      }
    } else if (("getPlatformVersion").equals(call.method)) {
      result.success("Android " + android.os.Build.VERSION.RELEASE);
    } else {
      result.notImplemented();
    }
  }

flutter onListen 回调对象

  @Override
  public void onListen(Object arguments, EventChannel.EventSink events) {
    mEventSink = events;
  }

地图业务参数

更新参数 updateOption

  /**
   * 准备定位
   * @param arguments
   */
  private void updateOption(Map arguments) {
    if (null == mLocationClient) {
      mLocationClient = new LocationClient(mContext);
    }
    // 判断是否启用位置提醒功能
    if (arguments.containsKey("isNotify")) {
      isNotify = true;
      if (null == mNotifyListener) {
        mNotifyListener = new MyNotifyLister();
      }
      mLocationClient.registerNotify(mNotifyListener);
      double lat = 0;
      double lon = 0;
      float radius = 0;

      if (arguments.containsKey("latitude")) {
        lat = (double)arguments.get("latitude");
      }

      if (arguments.containsKey("longitude")) {
        lon = (double)arguments.get("longitude");
      }

      if (arguments.containsKey("radius")) {
        double radius1 = (double)arguments.get("radius");
        radius = Float.parseFloat(String.valueOf(radius1));
      }

      String coorType = mLocationClient.getLocOption().getCoorType();
      mNotifyListener.SetNotifyLocation(lat, lon, radius, coorType);
      return;
    } else {
      isNotify = false;
    }

    mLocationClient.registerLocationListener(new CurrentLocationListener());

    // 判断是否启用国内外位置判断功能
    if (arguments.containsKey("isInChina")) {
      isInChina = true;
      return;
    } else {
      isInChina =false;
    }


    LocationClientOption option = new LocationClientOption();
    parseOptions(option, arguments);
    option.setProdName("flutter");
    mLocationClient.setLocOption(option);
  }

解析定位参数 parseOptions

  /**
   * 解析定位参数
   * @param option
   * @param arguments
   */
  private void parseOptions(LocationClientOption option,Map arguments) {
    if (arguments != null) {

      // 可选，设置是否返回逆地理地址信息。默认是true
      if (arguments.containsKey("isNeedAddres")) {
        if (((boolean)arguments.get("isNeedAddres"))) {
          option.setIsNeedAddress(true);
        } else {
          option.setIsNeedAddress(false);
        }
      }

      // 可选，设置定位模式，可选的模式有高精度、仅设备、仅网络。默认为高精度模式
      if (arguments.containsKey("locationMode")) {
        if (((int)arguments.get("locationMode")) == 1) {
          option.setLocationMode(LocationClientOption.LocationMode.Hight_Accuracy); // 高精度模式
        } else if (((int)arguments.get("locationMode")) == 2) {
          option.setLocationMode(LocationClientOption.LocationMode.Device_Sensors); // 仅设备模式
        } else if (((int)arguments.get("locationMode")) == 3) {
          option.setLocationMode(LocationClientOption.LocationMode.Battery_Saving); // 仅网络模式
        }
      }

      // 可选，设置场景定位参数，包括签到场景、运动场景、出行场景
      if ((arguments.containsKey("LocationPurpose"))) {
        isPurporseLoc = true;
        if  (((int)arguments.get("LocationPurpose")) == 1) {
          option.setLocationPurpose(LocationClientOption.BDLocationPurpose.SignIn); // 签到场景
        } else if (((int)arguments.get("LocationPurpose")) == 2) {
          option.setLocationPurpose(LocationClientOption.BDLocationPurpose.Transport); // 运动场景
        } else if (((int)arguments.get("LocationPurpose")) == 3) {
          option.setLocationPurpose(LocationClientOption.BDLocationPurpose.Sport); // 出行场景
        }
      } else {
        isPurporseLoc = false;
      }

      // 可选，设置需要返回海拔高度信息
      if (arguments.containsKey("isNeedAltitude")) {
        if (((boolean)arguments.get("isNeedAltitude"))) {
          option.setIsNeedAddress(true);
        } else {
          option.setIsNeedAltitude(false);
        }
      }

      // 可选，设置是否使用gps，默认false
      if (arguments.containsKey("openGps")) {
        if(((boolean)arguments.get("openGps"))) {
          option.setOpenGps(true);
        } else {
          option.setOpenGps(false);
        }
      }

      // 可选，设置是否允许返回逆地理地址信息，默认是true
      if (arguments.containsKey("isNeedLocationDescribe")) {
        if(((boolean)arguments.get("isNeedLocationDescribe"))) {
          option.setIsNeedLocationDescribe(true);
        } else {
          option.setIsNeedLocationDescribe(false);
        }
      }

      // 可选，设置发起定位请求的间隔，int类型，单位ms
      // 如果设置为0，则代表单次定位，即仅定位一次，默认为0
      // 如果设置非0，需设置1000ms以上才有效
      if (arguments.containsKey("scanspan")) {
        option.setScanSpan((int)arguments.get("scanspan"));
      }
      // 可选，设置返回经纬度坐标类型，默认GCJ02
      // GCJ02：国测局坐标；
      // BD09ll：百度经纬度坐标；
      // BD09：百度墨卡托坐标；
      // 海外地区定位，无需设置坐标类型，统一返回WGS84类型坐标
      if (arguments.containsKey("coorType")) {
        option.setCoorType((String)arguments.get("coorType"));
      }

      // 设置是否需要返回附近的poi列表
      if (arguments.containsKey("isNeedLocationPoiList")) {
        if (((boolean)arguments.get("isNeedLocationPoiList"))) {
          option.setIsNeedLocationPoiList(true);
        } else {
          option.setIsNeedLocationPoiList(false);
        }
      }
      // 设置是否需要最新版本rgc数据
      if (arguments.containsKey("isNeedNewVersionRgc")) {
        if (((boolean)arguments.get("isNeedNewVersionRgc"))) {
          option.setIsNeedLocationPoiList(true);
        } else {
          option.setIsNeedLocationPoiList(false);
        }
      }
    }
  }

编写启动、停止功能

开始定位


  private void startLocation() {
    if(null != mLocationClient) {
      mLocationClient.start();
    }
  }

停止定位


  private void stopLocation() {
    if (null != mLocationClient) {
      mLocationClient.stop();
      mLocationClient = null;
    }
  }

百度定位回调

CurrentLocationListener


  /**
   * 格式化时间
   *
   * @param time
   * @param strPattern
   * @return
   */
  private String formatUTC(long time, String strPattern) {
    if (TextUtils.isEmpty(strPattern)) {
      strPattern = "yyyy-MM-dd HH:mm:ss";
    }
    SimpleDateFormat sdf = null;
    try {
      sdf = new SimpleDateFormat(strPattern, Locale.CHINA);
      sdf.applyPattern(strPattern);
    } catch (Throwable e) {
      e.printStackTrace();
    }
    return sdf == null ? "NULL" : sdf.format(time);
  }

  class CurrentLocationListener extends BDAbstractLocationListener {

    @Override
    public void onReceiveLocation(BDLocation bdLocation) {

      if (null == mEventSink) {
        return;
      }

      Map result = new LinkedHashMap<>();

      // 判断国内外获取结果
      if (isInChina) {
        if (bdLocation.getLocationWhere() == BDLocation.LOCATION_WHERE_IN_CN) {
          result.put("isInChina", 1); // 在国内
        } else {
          result.put("isInChina", 0); // 在国外
        }
        mEventSink.success(result);
        return;
      }

      // 场景定位获取结果
      if (isPurporseLoc) {
        result.put("latitude", bdLocation.getLatitude()); // 纬度
        result.put("longitude", bdLocation.getLongitude()); // 经度
        mEventSink.success(result);
        return;
      }
      result.put("callbackTime", formatUTC(System.currentTimeMillis(), "yyyy-MM-dd HH:mm:ss"));
      if (null != bdLocation) {
        if (bdLocation.getLocType() == BDLocation.TypeGpsLocation
                || bdLocation.getLocType() == BDLocation.TypeNetWorkLocation
                || bdLocation.getLocType() == BDLocation.TypeOffLineLocation) {
          result.put("locType", bdLocation.getLocType()); // 定位结果类型
          result.put("locTime", bdLocation.getTime()); // 定位成功时间
          result.put("latitude", bdLocation.getLatitude()); // 纬度
          result.put("longitude", bdLocation.getLongitude()); // 经度
          if (bdLocation.hasAltitude()) {
            result.put("altitude", bdLocation.getAltitude()); // 高度
          }
          result.put("radius", Double.parseDouble(String.valueOf(bdLocation.getRadius()))); // 定位精度
          result.put("country", bdLocation.getCountry()); // 国家
          result.put("province", bdLocation.getProvince()); // 省份
          result.put("city", bdLocation.getCity()); // 城市
          result.put("district", bdLocation.getDistrict()); // 区域
          result.put("town", bdLocation.getTown()); // 城镇
          result.put("street", bdLocation.getStreet()); // 街道
          result.put("address", bdLocation.getAddrStr()); // 地址
          result.put("locationDetail", bdLocation.getLocationDescribe()); // 位置语义化描述
          if (null != bdLocation.getPoiList() && !bdLocation.getPoiList().isEmpty()) {

            List pois = bdLocation.getPoiList();
            StringBuilder stringBuilder = new StringBuilder();

            if (pois.size() == 1) {
              stringBuilder.append(pois.get(0).getName()).append(",").append(pois.get(0).getTags())
                      .append(pois.get(0).getAddr());
            } else {
              for (int i = 0; i < pois.size() - 1; i++) {
                stringBuilder.append(pois.get(i).getName()).append(",").append(pois.get(i).getTags())
                        .append(pois.get(i).getAddr()).append("|");
              }
              stringBuilder.append(pois.get(pois.size()-1).getName()).append(",").append(pois.get(pois.size()-1).getTags())
                      .append(pois.get(pois.size()-1).getAddr());

            }

            result.put("poiList",stringBuilder.toString()); // 周边poi信息
//
          }
          if (bdLocation.getFloor() != null) {
            // 当前支持高精度室内定位
            String buildingID = bdLocation.getBuildingID();// 百度内部建筑物ID
            String buildingName = bdLocation.getBuildingName();// 百度内部建筑物缩写
            String floor = bdLocation.getFloor();// 室内定位的楼层信息，如 f1,f2,b1,b2
            StringBuilder stringBuilder = new StringBuilder();
            stringBuilder.append(buildingID).append("-").append(buildingName).append("-").append(floor);
            result.put("indoor", stringBuilder.toString()); // 室内定位结果信息
            mLocationClient.startIndoorMode();// 开启室内定位模式（重复调用也没问题），开启后，定位SDK会融合各种定位信息（GPS,WI-FI，蓝牙，传感器等）连续平滑的输出定位结果；
          } else {
            mLocationClient.stopIndoorMode(); // 处于室外则关闭室内定位模式
          }
        } else {
          result.put("errorCode", bdLocation.getLocType()); // 定位结果错误码
          result.put("errorInfo", bdLocation.getLocTypeDescription()); // 定位失败描述信息
        }
      } else {
        result.put("errorCode", -1);
        result.put("errorInfo", "location is null");
      }
      mEventSink.success(result); // android端实时检测位置变化，将位置结果发送到flutter端
    }
  }

位置提醒服务

  public class MyNotifyLister extends BDNotifyListener {
    // 已到达设置监听位置附近
    public void onNotify(BDLocation mlocation, float distance){
      if (null == mEventSink) {
        return;
      }

      Map result = new LinkedHashMap<>();
      result.put("nearby", "已到达设置监听位置附近"); // 1为已经到达 0为未到达
      mEventSink.success(result);
    }
  }

Example 代码

动态授权

example/pubspec.yaml

dependencies:
  flutter:
    sdk: flutter

  ...

  permission_handler: ^5.0.1+1

example/lib/main.dart


class _MyAppState extends State {
  @override
  void initState() {
    super.initState();
    _requestPermission(); // 执行权限请求
  }

  // 动态申请定位权限
  Future _requestPermission() async {
    Map statuses = await [
      Permission.location,
      Permission.storage,
    ].request();

    return statuses[Permission.location].isGranted &&
        statuses[Permission.storage].isGranted;
  }
}

主界面代码

example/lib/main.dart

import 'dart:io';

import 'package:flutter/material.dart';
import 'dart:async';
import 'package:flutter_baidu_plugin_ducafecat/flutter_baidu_plugin_ducafecat.dart';
import 'package:flutter_baidu_plugin_ducafecat_example/views/location-view.dart';
import 'package:permission_handler/permission_handler.dart';

void main() {
  runApp(MyApp());
}

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

class _MyAppState extends State {
  @override
  void initState() {
    super.initState();
    _requestPermission(); // 执行权限请求

    if (Platform.isIOS == true) {
      FlutterBaiduPluginDucafecat.setApiKeyForIOS(
          "dkYT07blcAj3drBbcN1eGFYqt16HP1pR");
    }
  }

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

  // 动态申请定位权限
  Future _requestPermission() async {
    Map statuses = await [
      Permission.location,
      Permission.storage,
    ].request();

    return statuses[Permission.location].isGranted &&
        statuses[Permission.storage].isGranted;
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      routes: {
        "location_view": (context) => LocationView(),
      },
      home: MyHome(),
    );
  }
}

class MyHome extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('地图插件')),
      body: SingleChildScrollView(
        child: Column(
          children: [
            ListTile(
              title: Text('定位信息'),
              subtitle: Text('点击开始后，百度地图实时推送经纬度信息'),
              leading: Icon(Icons.location_searching),
              trailing: Icon(Icons.keyboard_arrow_right),
              onTap: () {
                Navigator.pushNamed(context, "location_view");
              },
            )
          ],
        ),
      ),
    );
  }
}

定位服务代码

example/lib/views/location-view.dart

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter_baidu_plugin_ducafecat/entity/flutter_baidu_location.dart';
import 'package:flutter_baidu_plugin_ducafecat/entity/flutter_baidu_location_android_option.dart';
import 'package:flutter_baidu_plugin_ducafecat/entity/flutter_baidu_location_ios_option.dart';
import 'package:flutter_baidu_plugin_ducafecat/flutter_baidu_plugin_ducafecat.dart';

class LocationView extends StatefulWidget {
  LocationView({Key key}) : super(key: key);

  @override
  _LocationViewState createState() => _LocationViewState();
}

class _LocationViewState extends State {
  FlutterBaiduPluginDucafecat _locationPlugin = FlutterBaiduPluginDucafecat();
  StreamSubscription> _locationListener; // 事件监听
  BaiduLocation _baiduLocation; // 经纬度信息
  // Map _loationResult; // 返回格式数据

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

    // 取消监听
    if (null != _locationListener) {
      _locationListener.cancel();
    }
  }

  // 返回定位信息
  void _setupListener() {
    if (_locationListener != null) {
      return;
    }
    _locationListener =
        _locationPlugin.onResultCallback().listen((Map result) {
      setState(() {
        // _loationResult = result;
        try {
          _baiduLocation = BaiduLocation.fromMap(result);
          print(_baiduLocation);
        } catch (e) {
          print(e);
        }
      });
    });
  }

  // 设置android端和ios端定位参数
  void _setLocOption() {
    // android 端设置定位参数
    BaiduLocationAndroidOption androidOption = new BaiduLocationAndroidOption();
    androidOption.setCoorType("bd09ll"); // 设置返回的位置坐标系类型
    androidOption.setIsNeedAltitude(true); // 设置是否需要返回海拔高度信息
    androidOption.setIsNeedAddres(true); // 设置是否需要返回地址信息
    androidOption.setIsNeedLocationPoiList(true); // 设置是否需要返回周边poi信息
    androidOption.setIsNeedNewVersionRgc(true); // 设置是否需要返回最新版本rgc信息
    androidOption.setIsNeedLocationDescribe(true); // 设置是否需要返回位置描述
    androidOption.setOpenGps(true); // 设置是否需要使用gps
    androidOption.setLocationMode(LocationMode.Hight_Accuracy); // 设置定位模式
    androidOption.setScanspan(1000); // 设置发起定位请求时间间隔

    Map androidMap = androidOption.getMap();

    // ios 端设置定位参数
    BaiduLocationIOSOption iosOption = new BaiduLocationIOSOption();
    iosOption.setIsNeedNewVersionRgc(true); // 设置是否需要返回最新版本rgc信息
    iosOption.setBMKLocationCoordinateType(
        "BMKLocationCoordinateTypeBMK09LL"); // 设置返回的位置坐标系类型
    iosOption.setActivityType("CLActivityTypeAutomotiveNavigation"); // 设置应用位置类型
    iosOption.setLocationTimeout(10); // 设置位置获取超时时间
    iosOption.setDesiredAccuracy("kCLLocationAccuracyBest"); // 设置预期精度参数
    iosOption.setReGeocodeTimeout(10); // 设置获取地址信息超时时间
    iosOption.setDistanceFilter(100); // 设置定位最小更新距离
    iosOption.setAllowsBackgroundLocationUpdates(true); // 是否允许后台定位
    iosOption.setPauseLocUpdateAutomatically(true); //  定位是否会被系统自动暂停

    Map iosMap = iosOption.getMap();

    _locationPlugin.prepareLoc(androidMap, iosMap);
  }

  // 启动定位
  void _handleStartLocation() {
    if (null != _locationPlugin) {
      _setupListener();
      _setLocOption();
      _locationPlugin.startLocation();
    }
  }

  // 停止定位
  void _handleStopLocation() {
    if (null != _locationPlugin) {
      _locationPlugin.stopLocation();
      setState(() {
        _baiduLocation = null;
      });
    }
  }

  ////////////////////////////////////////////////////////////

  // 显示地理信息
  Widget _buildLocationView() {
    return _baiduLocation != null
        ? Table(
            children: [
              TableRow(children: [
                TableCell(child: Text('经度')),
                TableCell(child: Text(_baiduLocation.longitude.toString())),
              ]),
              TableRow(children: [
                TableCell(child: Text('纬度')),
                TableCell(child: Text(_baiduLocation.latitude.toString())),
              ]),
              TableRow(children: [
                TableCell(child: Text('国家')),
                TableCell(
                    child: Text(_baiduLocation.country != null
                        ? _baiduLocation.country
                        : "")),
              ]),
              TableRow(children: [
                TableCell(child: Text('省份')),
                TableCell(
                    child: Text(_baiduLocation.province != null
                        ? _baiduLocation.province
                        : "")),
              ]),
              TableRow(children: [
                TableCell(child: Text('城市')),
                TableCell(
                    child: Text(_baiduLocation.city != null
                        ? _baiduLocation.city
                        : "")),
              ]),
              TableRow(children: [
                TableCell(child: Text('区县')),
                TableCell(
                    child: Text(_baiduLocation.district != null
                        ? _baiduLocation.district
                        : "")),
              ]),
              TableRow(children: [
                TableCell(child: Text('街道')),
                TableCell(
                    child: Text(_baiduLocation.street != null
                        ? _baiduLocation.street
                        : "")),
              ]),
              TableRow(children: [
                TableCell(child: Text('地址')),
                TableCell(
                    child: Text(_baiduLocation.address != null
                        ? _baiduLocation.address
                        : "")),
              ]),
              TableRow(children: [
                TableCell(child: Text('位置语义化描述')),
                TableCell(
                    child: Text(_baiduLocation.locationDetail != null
                        ? _baiduLocation.locationDetail
                        : "")),
              ]),
              TableRow(children: [
                TableCell(child: Text('周边poi信息')),
                TableCell(
                    child: Text(_baiduLocation.poiList != null
                        ? _baiduLocation.poiList
                        : "")),
              ]),
              TableRow(children: [
                TableCell(child: Text('错误码')),
                TableCell(
                    child: Text(_baiduLocation.errorCode != null
                        ? _baiduLocation.errorCode.toString()
                        : "")),
              ]),
              TableRow(children: [
                TableCell(child: Text('定位失败描述信息')),
                TableCell(
                    child: Text(_baiduLocation.errorInfo != null
                        ? _baiduLocation.errorInfo
                        : "")),
              ]),
            ],
          )
        : Container();
  }

  // 控制面板
  Widget _buildControlPlan() {
    return Row(
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        MaterialButton(
          color: Colors.blue,
          textColor: Colors.white,
          onPressed: _baiduLocation == null ? _handleStartLocation : null,
          child: Text('开始定位'),
        ),
        MaterialButton(
          color: Colors.blue,
          textColor: Colors.white,
          onPressed: _baiduLocation != null ? _handleStopLocation : null,
          child: Text('暂停定位'),
        )
      ],
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('定位信息'),
      ),
      body: SingleChildScrollView(
        child: Column(
          children: [
            _buildControlPlan(),
            Divider(),
            _buildLocationView(),
          ],
        ),
      ),
    );
  }
}

参考

https://ducafecat.tech
https://ducafecat.gitee.io

Flutter 混合开发 - 02 百度地图定位功能 android 篇

本节目标

环境

视频

代码

正文

创建组件的几种方式

现成轮子直接用

可参考的组件代码

参考官方集成文档编写组件

组件代码

百度应用管理，创建 AK

设置 Android 权限

添加 android libs 库文件

编写 Flutter 组件代码

触发 registerWith 的方式，老项目

成员变量、同步、异步处理

组件生命周期

地图业务参数

编写启动、停止功能

百度定位回调

位置提醒服务

Example 代码

动态授权

主界面代码

定位服务代码

参考

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