最近需要实现一个地理围栏相关的功能。
项目是和骑行相关的，主要是当游客或者骑友定位地址进入到对应的景点的地理围栏里面，则播报景点相关的报道语音。
接到需求之后，我开始查看高德的相关API，由于围栏是多边形的，则需要后台提供对应的围栏的经纬度数据，
1.创建地理围栏客户端
fenceClient = new GeoFenceClient(mContext);
IntentFilter filter = new IntentFilter(
ConnectivityManager.CONNECTIVITY_ACTION);
filter.addAction(GEOFENCE_BROADCAST_ACTION);
//注册地理围栏广播
registerReceiver(mGeoFenceReceiver, filter);
fenceClient.createPendingIntent(GEOFENCE_BROADCAST_ACTION);
fenceClient.setActivateAction(GeoFenceClient.GEOFENCE_IN);
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地理围栏广播可以接收到客户定位是否在围栏内部，主要是用来处理围栏相关的操作
2.根据围栏客户端创建地理围栏
list = new ArrayList<>();
String lnglatGaode = encloseEntity.getLnglatGaode();
ArrayList gaodeList = new GsonImpl()
.toList(lnglatGaode, LnglatGaodeEntity.class);
for (LnglatGaodeEntity entity : gaodeList) {
latLng = new DPoint(StringUtils.parseDouble(entity.getLat()),
StringUtils.parseDouble(entity.getLng()));
list.add(latLng);
}
DPoint firstLng = new DPoint(StringUtils.parseDouble(gaodeList.get(0).getLat()),
StringUtils.parseDouble(gaodeList.get(0).getLng()));
list.add(firstLng);
//后台提供的围栏list数据，围栏对应的id
fenceClient.addGeoFence(list, encloseEntity.getSrcurl());
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围栏数据由于是不规则的，则需要根据一系列的经纬度集合直接画出来，这样一切相关的程序就准备好
3.围栏广播相关处理
private BroadcastReceiver mGeoFenceReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
LogUtils.w("mGeoFenceReceiver---------------------");
// 接收广播
if (intent.getAction().equals(GEOFENCE_BROADCAST_ACTION)) {
Bundle bundle = intent.getExtras();
//获取对应的围栏的语音url地址
String customId = bundle
.getString(GeoFence.BUNDLE_KEY_CUSTOMID);
String fenceId = bundle.getString(GeoFence.BUNDLE_KEY_FENCEID);
GeoFence fence = bundle.getParcelable(GeoFence.BUNDLE_KEY_FENCE);
//status标识的是当前的围栏状态，不是围栏行为
int status = bundle.getInt(GeoFence.BUNDLE_KEY_FENCESTATUS);
StringBuffer sb = new StringBuffer();
switch (status) {
case GeoFence.STATUS_LOCFAIL:
sb.append("定位失败");
break;
case GeoFence.STATUS_IN:
sb.append("进入围栏 ");
openMediaPlay(customId);
break;
case GeoFence.STATUS_OUT:
sb.append("离开围栏 ");
mediaPlayer.pause();
break;
case GeoFence.STATUS_STAYED:
sb.append("停留在围栏内 ");
break;
default:
break;
}
if (status != GeoFence.STATUS_LOCFAIL) {
if (!TextUtils.isEmpty(customId)) {
sb.append(" customId: " + customId);
}
sb.append(" fenceId: " + fenceId);
}
String str = sb.toString();
Message msg = Message.obtain();
msg.obj = str;
msg.what = 2;
mHandler.sendMessage(msg);
}
}
};
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这里使用message主要是为了让对应的状态status按照队列发送，不至于乱,获取对应的语音url就可以播放了
4.查看对应的handlerMessage
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case 0:
//绘制多边形
drawFence2Map();
break;
case 1:
//围栏添加失败
int errorCode = msg.arg1;
break;
case 2:
//其他status数据类型
String statusStr = (String) msg.obj;
break;
default:
break;
}
}
//依次绘制多边形
private void drawFence2Map() {
new Thread() {
@Override
public void run() {
try {
synchronized (lock) {
if (null == fenceList || fenceList.isEmpty()) {
return;
}
for (GeoFence fence : fenceList) {
LogUtils.w("fence--id" + fence.getFenceId() + "---Custom--" + fence.getCustomId());
if (fenceMap.containsKey(fence.getFenceId())) {
continue;
}
drawPolygon(fence);
fenceMap.put(fence.getFenceId(), fence);
}
}
} catch (Throwable e) {
}
}
}.start();
}
private void drawPolygon(GeoFence fence) {
final List> pointList = fence.getPointList();
if (null == pointList || pointList.isEmpty()) {
return;
}
for (List subList : pointList) {
List lst = new ArrayList();
PolygonOptions polygonOption = new PolygonOptions();
for (DPoint point : subList) {
lst.add(new LatLng(point.getLatitude(), point.getLongitude()));
boundsBuilder.include(
new LatLng(point.getLatitude(), point.getLongitude()));
}
polygonOption.addAll(lst);
polygonOption.zIndex(2);
polygonOption.strokeColor(Color.argb(255, 255, 20, 147))
.fillColor(Color.argb(50, 255, 20, 147)).strokeWidth(2);
aMap.addPolygon(polygonOption);
}
}
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这里加上绘制多边形的围栏方便测试围栏效果
5.播放和暂停对应的音乐
private void openMediaPlay(String mp3) {
try {
if (!srcMp3.equals(mp3)) {
mediaPlayer.setDataSource(Net.HOST + Net.PREFIX + mp3);
}
srcMp3 = mp3;
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
// 通过异步的方式装载媒体资源
mediaPlayer.prepareAsync();
mediaPlayer.setOnPreparedListener(new OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
// 装载完毕回调
mediaPlayer.start();
}
});
} catch (IOException e) {
e.printStackTrace();
}
}
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使用的是系统自带的播放器
其实难点就在于围栏的绘制那块
)
