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);复制代码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<LnglatGaodeEntity> 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idfenceClient.addGeoFence(list, encloseEntity.getSrcurl());复制代码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); } } };复制代码这里使用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 @Overridepublic 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<List<DPoint>> pointList = fence.getPointList(); if (null == pointList || pointList.isEmpty()) { return; } for (List<DPoint> subList : pointList) { List<LatLng> lst = new ArrayList<LatLng>(); 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); }}复制代码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(); } }复制代码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
转载于:https://juejin.im/post/5c39f0ab6fb9a049c15f71ae