「呐，你知道吗？听说樱花飘落的速度是秒速五厘米哦。」

听到阿珍又念起这句经典台词，阿强，这个对自然界的花期不太敏感的程序员，也收到了“樱花开了”的讯号。

春天的樱花不能错过，赏樱是写进阿珍价值观的春日打卡动作。视频通话里，阿珍计划了一场远行——周末就回母校武大看樱花。但这一次，在外出差的阿强不能陪她一起去。

于是阿强，依然是拿出了自己吃饭的本事，将自己的周到关怀写进一个智能旅游管家APP，陪阿珍去武汉看樱花。即使不在身边，也要给她无微不至的出游体验：

出发行程不用记：出发前为她提醒出行时间，让她不再错过重要行程；
目的地天气早知道：根据目的地气象预报，提前给到出游装备和穿搭建议；
攻略玩法全推荐：让她省去做攻略的时间，抵达目的地，推送所需的游玩攻略和优惠政策……

以上管家式智能出行服务能力，有了华为情景感知服务（Awareness kit）的时间感知和天气感知能力、定位服务（Location Kit）的地理围栏能力，以及推送服务（Push kit）的加持，实现起来并不难。

效果示例

点击视频查看示例

原理解释

情景感知服务能感知用户当前的时间、位置、活动状态、耳机状态、天气状况、环境光、车载连接状态、信标连接状态等场景，并通过能常驻后台运行的围栏能力，并且可自由组合这些感知能力，建立组合围栏。

定位服务采用GNSS、Wi-Fi、基站等多途径的混合定位模式进行定位，能快速、精准获取位置信息，实现全球定位服务能力。

推送服务是华为为开发者提供的消息推送平台，建立了从云端到终端的消息推送通道。开发者通过集成Push Kit可以实时推送消息到用户终端。

代码实战

1、集成情景感知服务

开发准备

情景感知服务的集成需如下3个关键步骤，可以参考华为开发者联盟的文档

1. AppGallery Connect配置

2.集成HMS Awareness SDK

3.配置混淆脚本

https://developer.huawei.com/consumer/cn/doc/development/HMS-Guides/awareness-preparation?ha_source=hms1

代码开发关键步骤

1、在Manifest指定权限：

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />

2. 实现通过城市名获取天气信息：

String city = edCity.getText().toString();
if (city != null && !city.equals("")) {WeatherPosition weatherPosition = new WeatherPosition();weatherPosition.setCity(city);//传入指明传入地址用的语言类型，例如“zh_CN”、“en_US”等，“语言码_国家码”的格式。weatherPosition.setLocale("zh_CN");
// 获取Awareness Kit的“Capture Client”,调用天气查询能力Awareness.getCaptureClient(getApplicationContext()).getWeatherByPosition(weatherPosition).addOnSuccessListener(new OnSuccessListener<WeatherStatusResponse>() {@Overridepublic void onSuccess(WeatherStatusResponse weatherStatusResponse) {// 处理返回的天气数据WeatherStatus weatherStatus = weatherStatusResponse.getWeatherStatus();WeatherSituation weatherSituation = weatherStatus.getWeatherSituation();Situation situation = weatherSituation.getSituation();String weather;// 将天气id与天气名称匹配weather = getApplicationContext().getResources().getStringArray(R.array.cnWeather)[situation.getCnWeatherId()];// 更新UI((TextView) findViewById(R.id.tv_weather)).setText(weather);((TextView) findViewById(R.id.tv_windDir)).setText(situation.getWindDir());((TextView) findViewById(R.id.tv_windSpeed)).setText(situation.getWindSpeed() + " km/h");((TextView) findViewById(R.id.tv_temperature)).setText(situation.getTemperatureC() + "℃");}}).addOnFailureListener(new OnFailureListener() {@Overridepublic void onFailure(Exception e) {}});
}

3. 实现定时提醒和进入目的地后，接受到推送的消息：
（1）因为需要在应用被杀死时也能接受通知，需要注册静态广播：
在Manifest中：

<receiver android:name=".BarrierReceiver">
<intent-filter><action android:name="com.test.awarenessdemo.TimeBarrierReceiver.BARRIER_RECEIVER_ACTION"/>
</intent-filter>
</receiver>

在java代码中：

Intent intent = new Intent();
intent.setComponent(new ComponentName(MainActivity.this, BarrierReceiver.class));
mPendingIntent = PendingIntent.getBroadcast(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

（2）定义时间Barrier(围栏)和其对应的标签Label，然后添加Barrier：

// 获取输入的时间
String timeHour = edTimeHour.getText().toString();
String timeMinute = edTimeMinute.getText().toString();
int hour = 0;
int minute = 0;
if (!timeHour.equals("")) {hour = Integer.parseInt(timeHour);if (!timeMinute.equals("")) {minute = Integer.parseInt(timeMinute);}
}
long oneHourMilliSecond = 60 * 60 * 1000L;
long oneMinuteMilliSecond = 60 * 1000L;
// 定义"duringPeriodOfDay"围栏，在指定时区的指定时间段内发送通知
AwarenessBarrier periodOfDayBarrier = TimeBarrier.duringPeriodOfDay(TimeZone.getDefault(),// 这里设置的是提前2小时通知(hour - 2) * oneHourMilliSecond + minute * oneMinuteMilliSecond,hour * oneHourMilliSecond + minute * oneMinuteMilliSecond);String timeBarrierLabel = "period of day barrier laber";
// 定义更新围栏的请求
BarrierUpdateRequest.Builder builder = new BarrierUpdateRequest.Builder();
BarrierUpdateRequest request = builder.addBarrier(timeBarrierLabel, periodOfDayBarrier, mPendingIntent).build();
Awareness.getBarrierClient(getApplicationContext()).updateBarriers(request).addOnSuccessListener(new OnSuccessListener<Void>() {@Overridepublic void onSuccess(Void aVoid) {}}).addOnFailureListener(new OnFailureListener() {@Overridepublic void onFailure(Exception e) {}});

（3）定义地理Barrier(围栏)和其对应的标签Label，然后添加Barrier：

if (city != null && !city.equals("")) {//根据城市名称获取城市经纬度，这里是从内部文件中获取String data = cityMap.get(city);if (data != null){int flag = data.indexOf(",");double latitude = Double.parseDouble(data.substring(flag+1));double longitude = Double.parseDouble(data.substring(0,flag));double radius = 50;long timeOfDuration = 5000;// 定义"stay"围栏，在进入指定区域并驻留超过指定时间后触发围栏事件上报AwarenessBarrier stayBarrier = LocationBarrier.stay(latitude, longitude, radius, timeOfDuration);String stayBarrierLabel = "stay barrier label";// 定义更新围栏的请求BarrierUpdateRequest.Builder builder = new BarrierUpdateRequest.Builder();BarrierUpdateRequest request = builder.addBarrier(stayBarrierLabel, stayBarrier, mPendingIntent).build();Awareness.getBarrierClient(getApplicationContext()).updateBarriers(request).addOnSuccessListener(new OnSuccessListener<Void>() {@Overridepublic void onSuccess(Void aVoid) {}}).addOnFailureListener(new OnFailureListener() {@Overridepublic void onFailure(Exception e) {}});}
}

（4）定义广播接收器，用于监听Barrier事件，收到事件后进行应用的业务处理：

class BarrierReceiver extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {BarrierStatus barrierStatus = BarrierStatus.extract(intent);String label = barrierStatus.getBarrierLabel();int barrierPresentStatus = barrierStatus.getPresentStatus();String city = intent.getStringExtra("city");switch (label) {case DURING_PERIOD_OF_DAT_BARRIER_LABEL:if (barrierPresentStatus == BarrierStatus.TRUE) {initNotification(context,"1","time_channel","行程提醒","离出发还剩2小时");} else if (barrierPresentStatus == BarrierStatus.FALSE) {showToast(context, "It's not between ");} else {showToast(context, "The time status is unknown.");}break;case STAY_BARRIER_LABEL:if (barrierPresentStatus == BarrierStatus.TRUE) {initNotification(context,"2","area_channel","欢迎来到"+city,"查看旅行攻略");} else if (barrierPresentStatus == BarrierStatus.FALSE) {showToast(context,"You are not staying in the area set by locationBarrier" +" or the time of duration is not enough.");} else {showToast(context, "The location status is unknown.");}break;}}
}

2、基于位置的信息推送

开发准备

1. 在项目级gradle里添加华为maven仓
AndroidStudio项目级build.gradle文件，增量添加如下maven地址：

buildscript {repositories {maven { url 'http://developer.huawei.com/repo/'}}
dependencies {...// 增加agcp配置。classpath 'com.huawei.agconnect:agcp:1.4.2.300'}
}allprojects {repositories {maven { url 'http://developer.huawei.com/repo/'}}
}

2. 在应用级的build.gradle里面加上SDK依赖

dependencies {implementation 'com.huawei.hms:location:5.0.2.300'implementation 'com.huawei.hms:push: 5.0.2.301'
}

关键步骤说明

1.在AndroidManifest.xml文件里面声明系统权限
因华为定位服务采用GNSS、Wi-Fi、基站等多种混合定位模式进行定位,需要用到网络，精确的位置权限，粗略的位置权限，如果需要应用程序在后台执行时也具备持续定位能力，需要在Manifest文件中申请ACCESS_BACKGROUND_LOCATION权限：

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="com.huawei.hms.permission.ACTIVITY_RECOGNITION" />
<uses-permission android:name="android.permission.ACTIVITY_RECOGNITION" />

注：由于ACCESS_FINE_LOCATION，WRITE_EXTERNAL_STORAGE和READ_EXTERNAL_STORAGE是危险的系统权限，因此，需要动态的申请这些权限。如果权限不足，Location Service将会拒绝为应用开启定位。

2. 创建触发围栏
先根据需要创建围栏\围栏组，填好相关参数。

LocationSettingsRequest.Builder builders = new LocationSettingsRequest.Builder();
builders.addLocationRequest(mLocationRequest);
LocationSettingsRequest locationSettingsRequest = builders.build();
// Before requesting location update, invoke checkLocationSettings to check device settings.
Task<LocationSettingsResponse> locationSettingsResponseTasks = mSettingsClient.checkLocationSettings(locationSettingsRequest);
locationSettingsResponseTasks.addOnSuccessListener(new OnSuccessListener<LocationSettingsResponse>() {@Overridepublic void onSuccess(LocationSettingsResponse locationSettingsResponse) {Log.i(TAG, "check location settings success");mFusedLocationProviderClient.requestLocationUpdates(mLocationRequest, mLocationCallbacks, Looper.getMainLooper()).addOnSuccessListener(new OnSuccessListener<Void>() {@Overridepublic void onSuccess(Void aVoid) {LocationLog.i(TAG, "geoFence onSuccess");}}).addOnFailureListener(new OnFailureListener() {@Overridepublic void onFailure(Exception e) {LocationLog.e(TAG,"geoFence onFailure:" + e.getMessage());}});}
})

3. 设置触发推送通知
在GeoFenceBroadcastReceiver的onReceive接收到围栏触发成功提示后发送推送通知，在通知栏接收通知并展示。

if (geofenceData != null) {int errorCode = geofenceData.getErrorCode();int conversion = geofenceData.getConversion();ArrayList<Geofence> list = (ArrayList<Geofence>) geofenceData.getConvertingGeofenceList();Location myLocation = geofenceData.getConvertingLocation();boolean status = geofenceData.isSuccess();sb.append("errorcode: " + errorCode + next);sb.append("conversion: " + conversion + next);if (list != null) {for (int i = 0; i < list.size(); i++) {sb.append("geoFence id :" + list.get(i).getUniqueId() + next);}}if (myLocation != null) {sb.append("location is :" + myLocation.getLongitude() + " " + myLocation.getLatitude() + next);}sb.append("is successful :" + status);LocationLog.i(TAG, sb.toString());Toast.makeText(context, "" + sb.toString(), Toast.LENGTH_LONG).show();//new PushSendUtils().netSendMsg(sb.toString());
}

注：此代码围栏创建成功后会触发两次回调，conversion:1和4，分别代表进入触发回调和驻留触发回调一次。代码中输入的Trigger输入7的含义表示回调包括所有情况，即进入、驻留、离开等各种情况。

>>访问华为开发者联盟官网，了解更多相关内容

>>获取开发指导文档

>>华为移动服务开源仓库地址：GitHub、Gitee

关注我们，第一时间了解华为移动服务最新技术资讯~