关于hms-core:实现地图实时定位拯救路痴

实时定位，曾经成为利用必备能力之一，尤其是导航利用，更须要疾速精确定位用户实时地位。

华为定位服务可能赋予应用程序疾速、精准地获取用户地位信息的能力，同时定位服务助力寰球开发者实现个性化地图出现与交互，全面晋升利用的LBS体验。

上面为您具体解析，华为定位服务与地图服务如何实现利用实时定位。

预期性能

获取实时定位，并且在地图上显示地位点，首次启动跳转以后地位点，并且地位扭转以后地位点和地图视角随之扭转。

应用能力

华为定位服务: 根底定位

华为地图服务：地图显示

实现原理
应用华为定位服务获取实时地位，在地图上显示“我的地位”按钮，在地位变动时，跳转地图到以后定位。

筹备工作

AGC账号注册，我的项目创立

注册成为开发者

注册地址：

https://developer.huawei.com/...

创立利用，增加sha256，开启map/site开关，下载json文件

https://developer.huawei.com/...

配置android studio工程

1) 将“agconnect-services.json”文件拷贝到利用级根目录下

· 在“allprojects > repositories”中配置HMS Core SDK的Maven仓地址。

· 在“buildscript > repositories”中配置HMS Core SDK的Maven仓地址。

· 如果App中增加了“agconnect-services.json”文件则须要在“buildscript > dependencies”中减少agcp配置。

buildscript {    repositories {        maven { url 'https://developer.huawei.com/repo/' }        google()        jcenter()    }    dependencies {        classpath 'com.android.tools.build:gradle:3.3.2'        classpath 'com.huawei.agconnect:agcp:1.3.1.300'    }}allprojects {    repositories {        maven { url 'https://developer.huawei.com/repo/' }        google()        jcenter()    }}

2) 在“dependencies ”中增加如下编译依赖

dependencies {    implementation 'com.huawei.hms:maps:{version}'    implementation 'com.huawei.hms:location:{version}'}

3) 在文件头增加配置
apply plugin: 'com.huawei.agconnect'

4) 在android中配置签名。将生成签名证书指纹生成的签名文件复制到您工程的app目录下，并在“build.gradle”文件中配置签名

signingConfigs {    release {        // 签名证书            storeFile file("**.**")            // 密钥库口令            storePassword "******"            // 别名            keyAlias "******"            // 密钥口令            keyPassword "******"            v2SigningEnabled true        v2SigningEnabled true    }}buildTypes {    release {        minifyEnabled false        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'        debuggable true    }    debug {        debuggable true    }}

要害代码实现
1) 编写一个service 获取实时定位。

public class LocationService extends Service {    private final String TAG = this.getClass().getSimpleName();    List<ILocationChangedLister> locationChangedList = new ArrayList<>();    // location    private FusedLocationProviderClient fusedLocationProviderClient;    private LocationRequest mLocationRequest;    private final LocationCallback mLocationCallback = new LocationCallback() {        @Override        public void onLocationResult(LocationResult locationResult) {            super.onLocationResult(locationResult);            locationResult.getLocations();            Log.d(TAG, "onLocationResult: " + locationResult);            Location location = locationResult.getLocations().get(0);            Log.w(TAG, "onLocationResult:Latitude " + location.getLatitude());            Log.w(TAG, "onLocationResult:Longitude " + location.getLongitude());            for (ILocationChangedLister locationChanged : locationChangedList) {                locationChanged.locationChanged(new LatLng(location.getLatitude(), location.getLongitude()));            }        }        @Override        public void onLocationAvailability(LocationAvailability locationAvailability) {            super.onLocationAvailability(locationAvailability);            Log.d(TAG, "onLocationAvailability: " + locationAvailability.toString());        }    };    private final MyBinder binder = new MyBinder();    private final Random generator = new Random();    @Nullable    @Override    public IBinder onBind(Intent intent) {        return binder;    }    @Override    public void onCreate() {        Log.i("DemoLog", "TestService -> onCreate, Thread: " + Thread.currentThread().getName());        super.onCreate();    }    @Override    public int onStartCommand(Intent intent, int flags, int startId) {        Log.i("DemoLog",            "TestService -> onStartCommand, startId: " + startId + ", Thread: " + Thread.currentThread().getName());        return START_NOT_STICKY;    }    @Override    public boolean onUnbind(Intent intent) {        Log.i("DemoLog", "TestService -> onUnbind, from:" + intent.getStringExtra("from"));        return false;    }    @Override    public void onDestroy() {        Log.i("DemoLog", "TestService -> onDestroy, Thread: " + Thread.currentThread().getName());        super.onDestroy();    }    public int getRandomNumber() {        return generator.nextInt();    }    public void addLocationChangedlister(ILocationChangedLister iLocationChangedLister) {        locationChangedList.add(iLocationChangedLister);    }    public void getMyLoction() {        Log.d(TAG, "getMyLoction: ");        fusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(this);        SettingsClient settingsClient = LocationServices.getSettingsClient(this);        LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder();        mLocationRequest = new LocationRequest();        builder.addLocationRequest(mLocationRequest);        LocationSettingsRequest locationSettingsRequest = builder.build();        // location setting        settingsClient.checkLocationSettings(locationSettingsRequest)            .addOnSuccessListener(locationSettingsResponse -> fusedLocationProviderClient                .requestLocationUpdates(mLocationRequest, mLocationCallback, Looper.getMainLooper())                .addOnSuccessListener(aVoid -> Log.d(TAG, "onSuccess: " + aVoid)))            .addOnFailureListener(Throwable::printStackTrace);    }    public class MyBinder extends Binder {        public LocationService getService() {            return LocationService.this;        }    }    public interface ILocationChangedLister {        /**         * Update the location information         *         * @param latLng The new location information         */        public void locationChanged(LatLng latLng);    }}

2) 在Activity中绘制地图，监听实时地位

Xml中增加地图：

<com.huawei.hms.maps.MapView    android:id="@+id/map"    android:layout_width="match_parent"    android:layout_height="match_parent" />

activity地图绘制：

mapView.onCreate(null);mapView.getMapAsync(this);

绘制是关上我的地位按钮显示

@Overridepublic void onMapReady(HuaweiMap huaweiMap) {    hMap = huaweiMap;    hMap.setMyLocationEnabled(true);}

设置定位服务绑定监听

private ServiceConnection conn = new ServiceConnection() {    @Override    public void onServiceConnected(ComponentName name, IBinder binder) {        isBound = true;        if (binder instanceof LocationService.MyBinder) {            LocationService.MyBinder myBinder = (LocationService.MyBinder) binder;            locationService = myBinder.getService();            Log.i(TAG, "ActivityA onServiceConnected");            locationService.addLocationChangedlister(iLocationChangedLister);            locationService.getMyLoction();        }    }    @Override    public void onServiceDisconnected(ComponentName name) {        isBound = false;        locationService = null;        Log.i(TAG, "ActivityA onServiceDisconnected");    }};

绑定到LocationService：

private void bindLocationService() {    Intent intent = new Intent(mActivity, LocationService.class);    intent.putExtra("from", "ActivityA");    Log.i(TAG, "-------------------------------------------------------------");    Log.i(TAG, "bindService to ActivityA");    mActivity.bindService(intent, conn, Context.BIND_AUTO_CREATE);}

在地位变动监听中解决地位扭转

LocationService.ILocationChangedLister iLocationChangedLister = new LocationService.ILocationChangedLister() {    @Override    public void locationChanged(LatLng latLng) {        Log.d(TAG, "locationChanged: " + latLng.latitude);        Log.d(TAG, "locationChanged: " + latLng.longitude);        updateLocation(latLng);    }};

更新地图经纬度视角

private void updateLocation(LatLng latLng) {    mLatLng = latLng;    hMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, 1));}

测试
应用模仿地位软件扭转模仿地位，地图视角和我的地位按钮能够随之跳动。性能实现。

欲了解HMS Core更多详情，请参阅：
华为开发者联盟官网
获取开发领导文档
参加开发者探讨请到CSDN社区或者Reddit社区
下载demo和示例代码请到Github或者Gitee
解决集成问题请到Stack Overflow

原文链接：https://developer.huawei.com/...
原作者：HMS Core官网帐号