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; 
 
/** 
 * 周边公交查询帮助类;这里需要实现百度地图的两个接口，一个是Poi搜索监听器，一个是公交路线搜索监听器; 
 * @author Render; 
 */ 
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; 
  } 
 
  /** 
   * 初始化函数，主要是初始化百度地图的搜索对象以及存放周边公交信息的链表，至于Bean实体对象MrNearbyBus下文继续介绍; 
   */ 
  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(); 
    } 
  } 
   
  /** 
   * 销毁函数; 
   */ 
  public void Destory(){ 
     
    mSearch.destroy(); 
    mBusLineSearch.destroy(); 
  } 
 
   /** 
   * 搜索的周边的函数;由外部程序直接调用; 
   */ 
 
  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; 
      } 
    } 
  } 
 
  /** 
   * 主要是寻找该站点中是否存在相同的公交,如果存在则取两趟公交距离当前位置最近的点; 
   * 由于是搜索周边的公交站，可能会存在一趟公交车经过周边的两个或者三个公交站，为了排除冗余的信息， 
   * 故需要判断同一辆公交车的多个车站那个车站距离当前位置最近。 
   * @return 
   */ 
 
  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; 
  } 
   
  /** 
   * 处理查询后的结果是公交站点的情况; 
   * @param result 
   */ 
  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); 
  } 
   
  /** 
   * 查询公交线路; 
   */ 
  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)); 
  } 
   
  /** 
   * 处理公交路线的信息; 
   * @param result 
   */ 
  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(); 
  } 
} 

public class SearchNearbyActivity extends Activity implements MrNearbySearchListener { 
 
  private NearbySearchHelper mHelper=null; 
   
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_splash); 
 
    /** 
     * 创建周边搜索帮助类,初始化该帮助类,并设置帮助类的监听器; 
     */ 
    nearbySearchHelper=new NearbySearchHelper(); 
    nearbySearchHelper.init(); 
    nearbySearchHelper.setNearBySearchListener(this); 
  
  } 
 
  @Override 
  public void onRefreshBusNearby(List<MrNearbyBus> list) { 
     
    for(int i=0;i<list.size();i++){ 
       
      LogUtils.i(TAG, list.get(i).getBusName());   
    } 
 
    //busNearAdapter 为显示公交信息的适配器;     
 
    if(busNearAdapter==null){ 
      busNearAdapter=new BusNearAdapter(getActivity(), list); 
      mBusNearListView.setAdapter(busNearAdapter); 
    } 
    else { 
      busNearAdapter.updateListView(list); 
    } 
  }  
} 

package com.busleep.bean; 
 
import com.baidu.mapapi.model.LatLng; 
 
/** 
 * 周边的公交车信息; 
 * @author Render; 
 */ 
public class MrNearbyBus { 
 
  /** 
   * 公交车名称; 
   */ 
  private String busName=null; 
   
  /** 
   * 该公交线路的uid; 
   */ 
  private String uid=null; 
   
  /** 
   * 反向公交的Uid; 
   */ 
  private String reverseUid=null; 
   
  /** 
   * 查到周围的站点名称,根据该名称查到的公交线路; 
   */ 
  private String stationName=null; 
   
  /** 
   * 站点位置; 
   */ 
  private LatLng stationLaction=null; 
   
  /** 
   * 开往的方向; 
   */ 
  private String busDrection=null; 
   
  /** 
   * 构造函数; 
   */ 
  public MrNearbyBus(){ 
     
  } 
   
  public String getBusName() { 
    return busName; 
  } 
 
  public String getUid() { 
    return uid; 
  } 
 
  public void setUid(String uid) { 
    this.uid = uid; 
  } 
 
  public String getReverseUid() { 
    return reverseUid; 
  } 
 
  public void setReverseUid(String reverseUid) { 
    this.reverseUid = reverseUid; 
  } 
 
  public void setBusName(String busName) { 
    this.busName = busName; 
  } 
 
  public String getStationName() { 
    return stationName; 
  } 
 
  public void setStationName(String stationName) { 
    this.stationName = stationName; 
  } 
 
  public LatLng getStationLaction() { 
    return stationLaction; 
  } 
 
  public void setStationLaction(LatLng stationLaction) { 
    this.stationLaction = stationLaction; 
  } 
 
  public String getBusDrection() { 
    return busDrection; 
  } 
 
  public void setBusDrection(String busDrection) { 
    this.busDrection = busDrection; 
  } 
}