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   源码介绍

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package com.ifrh.viewposonmap;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

import com.baidu.location.BDLocation;
import com.baidu.location.BDLocationListener;
import com.baidu.location.LocationClient;
import com.baidu.location.LocationClientOption;
import com.baidu.mapapi.map.BaiduMap;
import com.baidu.mapapi.map.MapStatusUpdate;
import com.baidu.mapapi.map.MapStatusUpdateFactory;
import com.baidu.mapapi.map.MapView;
import com.baidu.mapapi.map.MyLocationConfiguration;
import com.baidu.mapapi.map.MyLocationConfiguration.LocationMode;
import com.baidu.mapapi.map.MyLocationData;
import com.baidu.mapapi.model.LatLng;

public class LocateActivity extends Activity 
{
	private LocationClient locationClient;
	private LocationMode locationMode;
	
	private MapView mapView;
	private BaiduMap baiduMap;
	
	private Button btn;
	private boolean isFirLoc=true;
	@Override
	protected void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		mapView=(MapView)findViewById(R.id.mapView);
		baiduMap=mapView.getMap();
		btn=(Button)findViewById(R.id.loc);
		// 开启定位图层
		baiduMap.setMyLocationEnabled(true);
		locationClient=new LocationClient(this);		
		locationClient.registerLocationListener(bdLocationListener);		
		LocationClientOption option = new LocationClientOption();
		option.setOpenGps(true);// 打开gps
		option.setCoorType("bd09ll"); // 设置坐标类型
		option.setScanSpan(1000);
		locationClient.setLocOption(option);
		locationClient.start();
		
		locationMode=LocationMode.NORMAL;
		btn.setText("普通");
		btn.setOnClickListener(new OnClickListener() {		
			@Override
			public void onClick(View v) {
               switch(locationMode)
               {
				case NORMAL:
					btn.setText("跟随");
					locationMode = LocationMode.FOLLOWING;
					baiduMap.setMyLocationConfigeration
					(new MyLocationConfiguration(locationMode, true, null));
					break;
				case COMPASS:
					btn.setText("普通");
					locationMode = LocationMode.NORMAL;
					baiduMap.setMyLocationConfigeration
					(new MyLocationConfiguration(locationMode, true, null));
					break;
				case FOLLOWING:
					btn.setText("罗盘");
					locationMode = LocationMode.COMPASS;
					baiduMap.setMyLocationConfigeration
					(new MyLocationConfiguration(locationMode, true, null));
					break;
               }
			}
		});
		
	}
	
	private BDLocationListener bdLocationListener=new BDLocationListener() 
	{		
		@Override
		public void onReceiveLocation(BDLocation location) 
		{
			if (location == null || mapView == null)
				return;
			MyLocationData locData = new MyLocationData.Builder()
			.accuracy(location.getRadius())
			.direction(100).latitude(location.getLatitude())
			.longitude(location.getLongitude()).build();
			baiduMap.setMyLocationData(locData);
			if (isFirLoc) 
			{
				isFirLoc = false;
				LatLng ll = new LatLng(location.getLatitude(),
				location.getLongitude());
				MapStatusUpdate u = MapStatusUpdateFactory.newLatLng(ll);
				baiduMap.animateMapStatus(u);
			}					
		}
	};

			
	@Override
	protected void onPause() {
		super.onPause();
		mapView.onPause();
	}

	@Override
	protected void onResume() {
		super.onResume();
		mapView.onResume();
	}

	@Override
	protected void onDestroy() {
		super.onDestroy();
		// 退出时销毁定位
		locationClient.stop();
		// 关闭定位图层
		baiduMap.setMyLocationEnabled(false);
		mapView.onDestroy();
		mapView = null;
	}

}