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:
developer.huawei.com/consumer/cn…
2. 创建应用,添加sha256,开启map/site开关,下载json文件
developer.huawei.com/consumer/cn…
3. 配置android studio工程
- 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()
}
}
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-
在“dependencies ”中添加如下编译依赖
dependencies {
implementation ‘com.huawei.hms:maps:{version}’
implementation ‘com.huawei.hms:location:{version}’
} -
在文件头添加配置
apply plugin: ‘com.huawei.agconnect’
-
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
-
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); } 复制代码
}
-
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" />
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activity地图绘制:
mapView.onCreate(null);
mapView.getMapAsync(this);
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绘制是打开我的位置 按钮显示
@Override
public void onMapReady(HuaweiMap huaweiMap) {
hMap = huaweiMap;
hMap.setMyLocationEnabled(true);
}
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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");
}
};
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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);
}
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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);
}
};
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更新地图 经纬度视角
private void updateLocation(LatLng latLng) {
mLatLng = latLng;
hMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, 1));
}
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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:developer.huawei.com/consumer/cn…
原作者:HMS Core官方帐号