Android学习笔记之百度地图（POI搜索之周边检索poiSearchNearBy）

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();
	}
}