android POI搜索，附近搜索，周边搜索定位介绍

       POI搜索有三种方式，根据范围和检索词发起范围检索poiSearchInbounds，城市poi检索poiSearchInCity，周边检索poiSearchNearBy。

下以周边检索为例介绍如何进行检索并显示覆盖物PoiOverlay：

public int poiSearchNearBy(java.lang.String key, GeoPoint pt, int radius)

根据中心点、半径与检索词发起周边检索. 

异步函数，返回结果在MKSearchListener里的onGetPoiResult方法通知

参数：

key - 关键词

pt - 中心点地理坐标

radius - 半径，单位:米

返回：

成功返回0，否则返回-1

Demo: 检索天安门周边5000米之内的KFC餐厅

 mMKSearch.poiSearchNearBy("KFC", new GeoPoint((int) (39.915 * 1E6), (int) (116.404 * 1E6)), 5000);

实现MySearchListener的onGetPoiResult，并展示检索结果：

 public void onGetPoiResult(MKPoiResult result, int type, int iError) {
     if (result == null) {
         return;
     }
     PoiOverlay poioverlay = new PoiOverlay(MyMapActivity.this, mMapView);
     poioverlay.setData(result.getAllPoi());
     mMapView.getOverlays().add(poioverlay);
 }

具体实现：

 package xiaosi.baiduMap;

 import android.os.Bundle;

 import com.baidu.mapapi.BMapManager;
 import com.baidu.mapapi.GeoPoint;
 import com.baidu.mapapi.MKAddrInfo;
 import com.baidu.mapapi.MKDrivingRouteResult;
 import com.baidu.mapapi.MKPoiResult;
 import com.baidu.mapapi.MKSearch;
 import com.baidu.mapapi.MKSearchListener;
 import com.baidu.mapapi.MKTransitRouteResult;
 import com.baidu.mapapi.MKWalkingRouteResult;
 import com.baidu.mapapi.MapActivity;
 import com.baidu.mapapi.MapController;
 import com.baidu.mapapi.MapView;
 import com.baidu.mapapi.PoiOverlay;

 public class BaiduMapActivity extends MapActivity
 {
     /** Called when the activity is first created. */
     private BMapManager mapManager = null;
     private String key = "1B79478DA01F7800AEA8602517A6D89B38151105";
     private MapView mapView = null;

     @Override
     public void onCreate(Bundle savedInstanceState)
     {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
         mapManager = new BMapManager(getApplication());
         mapManager.init(key, null);
         super.initMapActivity(mapManager);
         mapView = (MapView) findViewById(R.id.mapsView);
         mapView.setBuiltInZoomControls(true); // 设置启用内置的缩放控件
         MapController mapController = mapView.getController(); // 得到mMapView的控制权,可以用它控制和驱动平移和缩放
         mapController.setZoom(12); // 设置地图zoom级别


         MKSearch mKSearch = new MKSearch();
         mKSearch.init(mapManager, new MySearchListener());// 注意，MKSearchListener只支持一个，以最后一次设置为准
         mKSearch.poiSearchNearBy("KFC", new GeoPoint((int) (39.915 * 1E6),
                 (int) (116.404 * 1E6)), 5000);
     }

     public class MySearchListener implements MKSearchListener
     {
         public void onGetAddrResult(MKAddrInfo arg0, int arg1)
         {}

         public void onGetDrivingRouteResult(MKDrivingRouteResult arg0, int arg1)
         {}

         public void onGetPoiResult(MKPoiResult arg0, int arg1, int arg2)
         {
             if (arg0 == null) {
                 return;
             }
             PoiOverlay poioverlay = new PoiOverlay(BaiduMapActivity.this, mapView);
             poioverlay.setData(arg0.getAllPoi());
             mapView.getOverlays().add(poioverlay);
         }

         public void onGetTransitRouteResult(MKTransitRouteResult arg0, int arg1)
         {}

         public void onGetWalkingRouteResult(MKWalkingRouteResult arg0, int arg1)
         {}
     }

     @Override
     protected boolean isRouteDisplayed()
     {
         return false;
     }

     @Override
     protected void onDestroy()
     {
         if (mapManager != null)
         {
             mapManager.destroy();
             mapManager = null;
         }
         super.onDestroy();
     }

     @Override
     protected void onPause()
     {
         if (mapManager != null)
         {
             mapManager.stop();
         }
         super.onPause();
     }

     @Override
     protected void onResume()
     {
         if (mapManager != null)
         {
             mapManager.start();
         }
         super.onResume();
     }
 }