android实现查询公交车还有几站的功能

import java.util.ArrayList; import java.util.List;  import com.baidu.mapapi.model.LatLng; import com.baidu.mapapi.search.busline.BusLineResult; import com.baidu.mapapi.search.busline.BusLineSearch; import com.baidu.mapapi.search.busline.OnGetBusLineSearchResultListener; import com.baidu.mapapi.search.core.PoiInfo; import com.baidu.mapapi.search.core.SearchResult; import com.baidu.mapapi.search.poi.OnGetPoiSearchResultListener; import com.baidu.mapapi.search.poi.PoiDetailResult; import com.baidu.mapapi.search.poi.PoiNearbySearchOption; import com.baidu.mapapi.search.poi.PoiResult; import com.baidu.mapapi.search.poi.PoiSearch; import com.baidu.mapapi.utils.DistanceUtil; import com.busleep.app.CustomApplication; import com.busleep.bean.MrNearbyBus; import com.busleep.config.Constant; import com.busleep.listener.MrNearbySearchListener; import com.busleep.utils.LogUtils;   public class NearbySearchHelper implements OnGetPoiSearchResultListener,    OnGetBusLineSearchResultListener{    public static final String TAG = "NearbySearchHelper";      private final int BUSSTATION=0;          // 先查询周边的公交站点信息;   private final int BUSLINE=1;              // 站点的公交信息;   private PoiSearch mSearch = null;         // Poi点搜索模块;     private BusLineSearch mBusLineSearch = null;  // 公交路线搜索模块;      private int mType;                  // 查询类型;   private int nodeIndex=-1;            // 查询的索引;      private MrNearbySearchListener nearBySearchListener; //查询结束监听对象,该对象是为了封装而重新的一个监听器;      private List<MrNearbyBus> nearbyBuses=null;     //查询的结果;      public NearbySearchHelper(){      }    public void setNearBySearchListener(MrNearbySearchListener nearBySearchListener) {     this.nearBySearchListener = nearBySearchListener;   }       public void init(){          if(mSearch==null||mBusLineSearch==null){              mSearch = PoiSearch.newInstance();       mSearch.setOnGetPoiSearchResultListener(this);       mBusLineSearch = BusLineSearch.newInstance();       mBusLineSearch.setOnGetBusLineSearchResultListener(this);              nearbyBuses=new ArrayList<MrNearbyBus>();            }else {       nearbyBuses.clear();     }   }         public void Destory(){          mSearch.destroy();     mBusLineSearch.destroy();   }         public void searchNearby(){         //设置当前的搜索类型是公交站点的搜索;         mType=BUSSTATION;      //获取当前位置的经度与纬度，该值是通过上文的定位方式来获取的;          double latitude=CustomApplication.mLastLocation.getLatitude();     double longtitude=CustomApplication.mLastLocation.getLongitude();          //查询周边公交线路;采用百度地图的周边搜索接口，并定义周边点搜索选项，其中Constant.nearbyRadius是周边搜索的半径;     mSearch.searchNearby(new PoiNearbySearchOption().keyword("公交站")         .location(new LatLng(latitude,longtitude)).radius(Constant.nearbyRadius));        }      @Override   public void onGetBusLineResult(BusLineResult arg0) {     // TODO Auto-generated method stub        }    @Override   public void onGetPoiDetailResult(PoiDetailResult arg0) {     // TODO Auto-generated method stub        }    //该函数是百度地图的周边兴趣点搜索回调函数；该函数在两处都进行了回调，所以需要根据当前的搜索类型来进行判断；    @Override   public void onGetPoiResult(PoiResult result) {          switch(mType)     {       case BUSSTATION:       {         //如果查询失败直接返回;         if (result == null || result.error != SearchResult.ERRORNO.NO_ERROR)         {           LogUtils.i(TAG, "查询站点失败！");           nearBySearchListener.onRefreshBusNearby(nearbyBuses);           return;         }         //处理公交站点的搜索结果；         ProcessBusStation(result);         break;       }       case BUSLINE:       {         //如果查询失败直接返回;         if (result == null || result.error != SearchResult.ERRORNO.NO_ERROR)         {           LogUtils.i(TAG, "查询线路失败！");           nearBySearchListener.onRefreshBusNearby(nearbyBuses);           return;         }         //处理公交线路的搜索结果;         ProcessBusLine(result);         break;       }     }   }        private boolean FindSameBus(MrNearbyBus nearbyBus){          String busName=nearbyBus.getBusName();          LatLng nowLocation=new LatLng(CustomApplication.mLastLocation.getLatitude(),         CustomApplication.mLastLocation.getLongitude());          LatLng newLocation=nearbyBus.getStationLaction();          double newDistance=DistanceUtil.getDistance(nowLocation, newLocation);     double oldDistance=0.0;          for(int i=0;i<nearbyBuses.size();i++)     {       //如果存在名称相同的公交线路;       if(nearbyBuses.get(i).getBusName().equals(busName))       {         LatLng oldLocation=nearbyBuses.get(i).getStationLaction();          //DistanceUtil是百度地图提供的计算两个经纬度坐标之间的距离工具类;                  oldDistance=DistanceUtil.getDistance(nowLocation, oldLocation);                  //如果当前的距离小于之前的距离,则更新该公交车的信息;         if(newDistance<oldDistance)         {           nearbyBuses.get(i).setStationLaction(newLocation);           nearbyBuses.get(i).setStationName(nearbyBus.getStationName());         }         return true;       }     }     return false;   }         private void ProcessBusStation(PoiResult result){          for (PoiInfo poi : result.getAllPoi())     {       if (poi.type == PoiInfo.POITYPE.BUS_STATION)       {           String busNames []=poi.address.split(";");                  for(int i=0;i<busNames.length;++i){                      MrNearbyBus nearbyBus=new MrNearbyBus();           nearbyBus.setBusName(busNames[i]);           nearbyBus.setStationName(poi.name);           nearbyBus.setStationLaction(poi.location);                      boolean bRes=FindSameBus(nearbyBus);                      if(!bRes)           {             nearbyBuses.add(nearbyBus);           }             }       }     }      //搜索完了公交站点后则根据公交站点来搜索公交路线，由于搜索时间有可能会挺长，故查询完站点后就调用周边搜索监听器      //来刷新数据，UI线程实现了该监听器,则可以直接刷新数据。      searchBusLine();     nearBySearchListener.onRefreshBusNearby(nearbyBuses);   }         private void searchBusLine(){     //nodeIndex表示当前周边站点的索引;          nodeIndex++;          mType=BUSLINE;          if(nearbyBuses.isEmpty()){       return;     }          //部分刷新;     if(nodeIndex%5==0){       nearBySearchListener.onRefreshBusNearby(nearbyBuses);     }          //如果此时返回表明查询完毕;     if(nodeIndex >= nearbyBuses.size()){       LogUtils.i(TAG, "查询完毕！");       nearBySearchListener.onRefreshBusNearby(nearbyBuses);       return;     }          //这里还是采用搜索周边的方式,效率会更高;     double latitude=CustomApplication.mLastLocation.getLatitude();     double longtitude=CustomApplication.mLastLocation.getLongitude();     //获取当前节点下的周边公交车的公交名称;          String busLineName=nearbyBuses.get(nodeIndex).getBusName();     mSearch.searchNearby(new PoiNearbySearchOption().keyword(busLineName+"公交")         .location(new LatLng(latitude,longtitude)).radius(Constant.nearbyRadius));   }         private void ProcessBusLine(PoiResult result)   {     for (PoiInfo poi : result.getAllPoi())     {       if (poi.type == PoiInfo.POITYPE.BUS_LINE)       {         MrNearbyBus nearbyBus=nearbyBuses.get(nodeIndex);                  //如果是第一次进来;         if(nearbyBus.getUid()==null){              nearbyBus.setUid(poi.uid);           String drection=poi.name;           int index=drection.indexOf("(");           int length=drection.length();                      drection=drection.substring(index+1,length-1);           nearbyBus.setBusDrection(drection);                    }else {  //否则是返程公交车;                      nearbyBus.setReverseUid(poi.uid);;         }       }     }     searchBusLine();   } }