关于flutter:Flutter-混合开发-02-百度地图定位功能-android-篇

百度地图业务
百度组件初始
编写定位代码 android 篇

$ 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)

https://www.bilibili.com/vide…

https://github.com/ducafecat/…

能够间接用 ???? v1.0.3

https://github.com/ducafecat/…

官网仓库搜寻
https://pub.dev/flutter/packages

https://pub.flutter-io.cn/flu…

通过仓库，查找 github 代码仓
网站、客服索取代码

官网文档

http://lbsyun.baidu.com/index…

利用治理

https://lbsyun.baidu.com/apic…

查问 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


...

        <!-- 在这里设置 android 端 ak-->
        <meta-data
            android:name="com.baidu.lbsapi.API_KEY"
            android:value="aCUtcLDufllGi4nEaKgU8FmBqufFyekh" />

    </application>
</manifest>

文档

http://lbsyun.baidu.com/index…

android/src/main/AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="tech.ducafecat.flutter_baidu_plugin_ducafecat">
    <!-- 这个权限用于进行网络定位 -->
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"></uses-permission>
    <!-- 这个权限用于拜访 GPS 定位 -->
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>
    <!-- 用于拜访 wifi 网络信息，wifi 信息会用于进行网络定位 -->
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>
    <!-- 获取运营商信息，用于反对提供运营商信息相干的接口 -->
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
    <!-- 这个权限用于获取 wifi 的获取权限，wifi 信息会用来进行网络定位 -->
    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"></uses-permission>
    <!-- 用于读取手机以后的状态 -->
    <uses-permission android:name="android.permission.READ_PHONE_STATE"></uses-permission>
    <!-- 写入扩大存储，向扩展卡写入数据，用于写入离线定位数据 -->
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
    <!-- 拜访网络，网络定位须要上网 -->
    <uses-permission android:name="android.permission.INTERNET" />

    <!-- 读取零碎信息，蕴含零碎版本等信息，用作统计 -->
    <uses-permission android:name="com.android.launcher.permission.READ_SETTINGS" />
    <!-- 程序在手机屏幕敞开后后盾过程依然运行 -->
    <uses-permission android:name="android.permission.WAKE_LOCK" />
    <application>
        <!-- 申明 service 组件 -->
        <service
            android:name="com.baidu.location.f"
            android:enabled="true"
            android:process=":remote" >
        </service>
    </application>
</manifest>

android/build.gradle

...
android {
    compileSdkVersion 28

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

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

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

地理信息 lib/entity/flutter_baidu_location.dart

/// 百度定位后果类，用于存储各类定位后果信息
class BaiduLocation {
  /// 定位胜利工夫
  final String locTime;

  /// 定位后果类型
  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;

  /// 地位语义化形容，例如 "在百度大厦左近"
  final String locationDetail;

  /// 周边 poi 信息，每个 poi 之间用 "|" 隔开

  final String poiList;

  /// 定位后果回调工夫
  final String callbackTime;

  /// 错误码
  final int errorCode;

  /// 定位失败形容信息
  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});

  /// 依据传入的 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;

  /// 是否须要返回地址信息
  bool isNeedAddres;

  /// 是否须要返回海拔高度信息
  bool isNeedAltitude;

  /// 是否须要返回周边 poi 信息
  bool isNeedLocationPoiList;

  /// 是否须要返回新版本 rgc 信息
  bool isNeedNewVersionRgc;

  /// 是否须要返回地位形容信息
  bool isNeedLocationDescribe;

  /// 是否应用 gps
  bool openGps;

  /// 可选，设置发动定位申请的距离，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 以上才无效
  int scanspan;

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

  /// 可选，设置场景定位参数，包含签到场景、静止场景、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；/// 海内地区定位，无需设置坐标类型，对立返回 WGS84 类型坐标
  void setCoorType(String coorType) {this.coorType = coorType;}

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

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

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

  /// 是否须要返回地位形容信息
  void setIsNeedLocationDescribe(bool isNeedLocationDescribe) {this.isNeedLocationDescribe = isNeedLocationDescribe;}

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

  /// 是否应用 gps
  void setOpenGps(bool openGps) {this.openGps = openGps;}

  /// 可选，设置发动定位申请的距离，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 以上才无效
  void setScanspan(int scanspan) {this.scanspan = scanspan;}

  /// 设置定位模式，可选的模式有高精度、仅设施、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，包含签到场景、静止场景、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});

  /// 依据传入的 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,

  /// 仅设施 (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靠近实在地位的定位后果（定位速度可能会提早 1 -3s）SignIn,

  /// 出行场景
  /// 高精度间断定位，实用于有户内外切换的场景，卫星定位和网络定位互相切换，卫星定位胜利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后果
  Sport,

  /// 静止场景
  /// 高精度间断定位，实用于有户内外切换的场景，卫星定位和网络定位互相切换，卫星定位胜利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后果
  Transport
}

ios 配置项 lib/entity/flutter_baidu_location_ios_option.dart

/// 设置 ios 端定位参数类
class BaiduLocationIOSOption {
  /// 设置地位获取超时工夫
  int locationTimeout;

  /// 设置获取地址信息超时工夫
  int reGeocodeTimeout;

  /// 设置利用地位类型
  String activityType;

  /// 设置返回地位的坐标系类型
  String BMKLocationCoordinateType;

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

  /// 是否须要最新版本 rgc 数据
  bool isNeedNewVersionRgc;

  /// 指定定位是否会被零碎主动暂停
  bool pausesLocationUpdatesAutomatically;

  /// 指定是否容许后盾定位
  bool allowsBackgroundLocationUpdates;

  /// 设定定位的最小更新间隔
  double distanceFilter;

  /// 指定是否容许后盾定位
  /// allowsBackgroundLocationUpdates 为 true 则容许后盾定位
  /// allowsBackgroundLocationUpdates 为 false 则不容许后盾定位
  void setAllowsBackgroundLocationUpdates(bool allowsBackgroundLocationUpdates) {this.allowsBackgroundLocationUpdates = allowsBackgroundLocationUpdates;}

  /// 指定定位是否会被零碎主动暂停
  /// pausesLocationUpdatesAutomatically 为 true 则定位会被零碎主动暂停
  /// pausesLocationUpdatesAutomatically 为 false 则定位不会被零碎主动暂停
  void setPauseLocUpdateAutomatically(bool pausesLocationUpdatesAutomatically) {
    this.pausesLocationUpdatesAutomatically =
        pausesLocationUpdatesAutomatically;
  }

  /// 设置地位获取超时工夫
  void setLocationTimeout(int locationTimeout) {this.locationTimeout = locationTimeout;}

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

  /// 设置利用地位类型
  /// activityType 可选值包含:
  /// "CLActivityTypeOther"
  /// "CLActivityTypeAutomotiveNavigation"
  /// "CLActivityTypeFitness"
  /// "CLActivityTypeOtherNavigation"
  void setActivityType(String activityType) {this.activityType = activityType;}

  /// 设置返回地位的坐标系类型
  /// BMKLocationCoordinateType 可选值包含:
  /// "BMKLocationCoordinateTypeBMK09LL"
  /// "BMKLocationCoordinateTypeBMK09MC"
  /// "BMKLocationCoordinateTypeWGS84"
  /// "BMKLocationCoordinateTypeGCJ02"
  void setBMKLocationCoordinateType(String BMKLocationCoordinateType) {this.BMKLocationCoordinateType = BMKLocationCoordinateType;}

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

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

  /// 是否须要最新版本 rgc 数据
  /// isNeedNewVersionRgc 为 true 则须要返回最新版本 rgc 数据
  /// isNeedNewVersionRgc 为 false 则不须要返回最新版本 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});

  /// 依据传入的 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 端被动调用原生端办法
  static const MethodChannel _channel =
      const MethodChannel('flutter_baidu_plugin_ducafecat');

  /// 原生端被动回传后果数据到 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<bool> 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;
  }

  /// 进行定位
  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 则判断为已达到设置监听地位左近
  Stream<Map<String, Object>> onResultCallback() {
    Stream<Map<String, Object>> _resultMap;
    if (_resultMap == null) {_resultMap = _stream.receiveBroadcastStream().map<Map<String, Object>>((element) => element.cast<String, Object>());
    }
    return _resultMap;
  }
}

// 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;
  }
}

MethodChannel 申请办法后，同步返回后果

EventChannel 组件被动推音讯到 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; // 地位揭示对象

  private boolean isPurporseLoc = false; // 签到场景
  private boolean isInChina = false;  // 是否启用国内外地位判断性能
  private boolean isNotify = false; // 地位揭示

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

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、进行定位
     */
    channel = new MethodChannel(flutterPluginBinding.getBinaryMessenger(), CHANNEL_METHOD_LOCATION);
    channel.setMethodCallHandler(this);

    /**
     * 监听地位变动
     */
    eventChannel = new EventChannel(flutterPluginBinding.getBinaryMessenger(), CHANNEL_STREAM_LOCATION);
    eventChannel.setStreamHandler(this);
  }

老我的项目组件注册 registerWith

  public static void registerWith(Registrar registrar) {FlutterBaiduPluginDucafecatPlugin plugin = new FlutterBaiduPluginDucafecatPlugin();
    plugin.mContext = registrar.context();

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

    /**
     * 监听地位变动
     */
    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());
  }

登记组件 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);
  }

办法调用 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(); // 进行定位
    } 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;}

更新参数 updateOption

  /**
   * 筹备定位
   * @param arguments
   */
  private void updateOption(Map arguments) {if (null == mLocationClient) {mLocationClient = new LocationClient(mContext);
    }
    // 判断是否启用地位揭示性能
    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地位判断性能
    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，设置是否返回逆天文地址信息。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、仅设施、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); // 仅设施模式
        } 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，包含签到场景、静止场景、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); // 静止场景
        } else if (((int)arguments.get("LocationPurpose")) == 3) {option.setLocationPurpose(LocationClientOption.BDLocationPurpose.Sport); // 出行场景
        }
      } else {isPurporseLoc = false;}

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

      // 可选，设置是否容许返回逆天文地址信息，默认是 true
      if (arguments.containsKey("isNeedLocationDescribe")) {if(((boolean)arguments.get("isNeedLocationDescribe"))) {option.setIsNeedLocationDescribe(true);
        } else {option.setIsNeedLocationDescribe(false);
        }
      }

      // 可选，设置发动定位申请的距离，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 以上才无效
      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；// 海内地区定位，无需设置坐标类型，对立返回 WGS84 类型坐标
      if (arguments.containsKey("coorType")) {option.setCoorType((String)arguments.get("coorType"));
      }

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

开始定位


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

进行定位


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

CurrentLocationListener


  /**
   * 格式化工夫
   *
   * @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<String, Object> result = new LinkedHashMap<>();

      // 判断国内外获取后果
      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;
      }

      // 场景定位获取后果
      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()); // 定位后果类型
          result.put("locTime", bdLocation.getTime()); // 定位胜利工夫
          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()); // 地位语义化形容
          if (null != bdLocation.getPoiList() && !bdLocation.getPoiList().isEmpty()) {List<Poi> 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) {
            // 以后反对高精度室内定位
            String buildingID = bdLocation.getBuildingID();// 百度外部建筑物 ID
            String buildingName = bdLocation.getBuildingName();// 百度外部建筑物缩写
            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()); // 室内定位后果信息
            mLocationClient.startIndoorMode();// 开启室内定位模式（反复调用也没问题），开启后，定位 SDK 会交融各种定位信息（GPS,WI-FI，蓝牙，传感器等）间断平滑的输入定位后果；} else {mLocationClient.stopIndoorMode(); // 处于室外则敞开室内定位模式
          }
        } else {result.put("errorCode", bdLocation.getLocType()); // 定位后果错误码
          result.put("errorInfo", bdLocation.getLocTypeDescription()); // 定位失败形容信息
        }
      } else {result.put("errorCode", -1);
        result.put("errorInfo", "location is null");
      }
      mEventSink.success(result); // android 端实时检测地位变动，将地位后果发送到 flutter 端
    }
  }

  public class MyNotifyLister extends BDNotifyListener {
    // 已达到设置监听地位左近
    public void onNotify(BDLocation mlocation, float distance){if (null == mEventSink) {return;}

      Map<String, Object> result = new LinkedHashMap<>();
      result.put("nearby", "已达到设置监听地位左近"); // 1 为曾经达到 0 为未达到
      mEventSink.success(result);
    }
  }

example/pubspec.yaml

dependencies:
  flutter:
    sdk: flutter

  ...

  permission_handler: ^5.0.1+1

example/lib/main.dart


class _MyAppState extends State<MyApp> {
  @override
  void initState() {super.initState();
    _requestPermission(); // 执行权限申请}

  // 动静申请定位权限
  Future<bool> _requestPermission() async {
    Map<Permission, PermissionStatus> statuses = await [
      Permission.location,
      Permission.storage,
    ].request();

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

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<MyApp> {
  @override
  void initState() {super.initState();
    _requestPermission(); // 执行权限申请

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

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

  // 动静申请定位权限
  Future<bool> _requestPermission() async {
    Map<Permission, PermissionStatus> 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");
              },
            )
          ],
        ),
      ),
    );
  }
}

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<LocationView> {FlutterBaiduPluginDucafecat _locationPlugin = FlutterBaiduPluginDucafecat();
  StreamSubscription<Map<String, Object>> _locationListener; // 事件监听
  BaiduLocation _baiduLocation; // 经纬度信息
  // Map<String, Object> _loationResult; // 返回格局数据

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

    // 勾销监听
    if (null != _locationListener) {_locationListener.cancel();
    }
  }

  // 返回定位信息
  void _setupListener() {if (_locationListener != null) {return;}
    _locationListener =
        _locationPlugin.onResultCallback().listen((Map<String, Object> 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"); // 设置返回的地位坐标系类型
    androidOption.setIsNeedAltitude(true); // 设置是否须要返回海拔高度信息
    androidOption.setIsNeedAddres(true); // 设置是否须要返回地址信息
    androidOption.setIsNeedLocationPoiList(true); // 设置是否须要返回周边 poi 信息
    androidOption.setIsNeedNewVersionRgc(true); // 设置是否须要返回最新版本 rgc 信息
    androidOption.setIsNeedLocationDescribe(true); // 设置是否须要返回地位形容
    androidOption.setOpenGps(true); // 设置是否须要应用 gps
    androidOption.setLocationMode(LocationMode.Hight_Accuracy); // 设置定位模式
    androidOption.setScanspan(1000); // 设置发动定位申请工夫距离

    Map androidMap = androidOption.getMap();

    // ios 端设置定位参数
    BaiduLocationIOSOption iosOption = new BaiduLocationIOSOption();
    iosOption.setIsNeedNewVersionRgc(true); // 设置是否须要返回最新版本 rgc 信息
    iosOption.setBMKLocationCoordinateType("BMKLocationCoordinateTypeBMK09LL"); // 设置返回的地位坐标系类型
    iosOption.setActivityType("CLActivityTypeAutomotiveNavigation"); // 设置利用地位类型
    iosOption.setLocationTimeout(10); // 设置地位获取超时工夫
    iosOption.setDesiredAccuracy("kCLLocationAccuracyBest"); // 设置预期精度参数
    iosOption.setReGeocodeTimeout(10); // 设置获取地址信息超时工夫
    iosOption.setDistanceFilter(100); // 设置定位最小更新间隔
    iosOption.setAllowsBackgroundLocationUpdates(true); // 是否容许后盾定位
    iosOption.setPauseLocUpdateAutomatically(true); //  定位是否会被零碎主动暂停

    Map iosMap = iosOption.getMap();

    _locationPlugin.prepareLoc(androidMap, iosMap);
  }

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

  // 进行定位
  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('地位语义化形容')),
                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('定位失败形容信息')),
                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(),],
        ),
      ),
    );
  }
}

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

关于flutter:Flutter-混合开发-02-百度地图定位功能-android-篇

本节指标

环境

视频

代码

注释

创立组件的几种形式

现成轮子间接用

可参考的组件代码

参考官网集成文档编写组件

组件代码

百度利用治理，创立 AK

设置 Android 权限

增加 android libs 库文件

编写 Flutter 组件代码

触发 registerWith 的形式，老我的项目

成员变量、同步、异步解决

组件生命周期

地图业务参数

编写启动、进行性能

百度定位回调

地位揭示服务

Example 代码

动静受权

主界面代码

定位服务代码

参考