实时定位，已经成为应用必备能力之一，尤其是导航应用，更需要快速准确定位用户实时位置。
华为定位服务能够赋予应用程序快速、精准地获取用户位置信息的能力，同时定位服务助力全球开发者实现个性化地图呈现与交互，全面提升应用的LBS体验。
下面为您详细解析，华为定位服务与地图服务如何实现应用实时定位。
预期功能
获取实时定位，并且在地图上显示位置点，首次启动跳转当前位置点，并且位置改变当前位置点和地图视角随之改变。
使用能力
华为定位服务: 基础定位
华为地图服务：地图显示
实现原理
使用华为定位服务获取实时位置，在地图上显示“我的位置”按钮，在位置变化时，跳转地图到当前定位。
准备工作
AGC账号注册，项目创建
1. 注册成为开发者
注册地址：
https://developer.huawei.com/consumer/cn/service/josp/agc/index.html?ha__source=hms1
2. 创建应用，添加sha256，开启map/site开关，下载json文件
3. 配置android studio工程
1) 将“agconnect-services.json”文件拷贝到应用级根目录下
· 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中添加了“agconnect-services.json”文件则需要在“buildscript > dependencies”中增加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 ”中添加如下编译依赖
dependencies {
implementation 'com.huawei.hms:maps:{version}'
implementation 'com.huawei.hms:location:{version}'
}
3) 在文件头添加配置
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
}
}
关键代码实现
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，监听实时位置
Xml中添加地图：
<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);
绘制是打开我的位置 按钮显示
@Override
public 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);
}
在位置变化监听中处理 位置改变
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
使用模拟位置软件改变模拟位置，地图视角和我的位置按钮可以随之跳动。功能实现。
欲了解HMS Core更多详情，请参阅：
>>华为开发者联盟官网
>>获取开发指导文档
>>参与开发者讨论请到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官方帐号