在地图上显示当前的位置

package com.aihunqin.crazy;

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

import com.baidu.location.BDLocation;
import com.baidu.location.BDLocationListener;
import com.baidu.location.LocationClient;
import com.baidu.location.LocationClientOption;
import com.baidu.location.LocationClientOption.LocationMode;
import com.baidu.mapapi.SDKInitializer;
import com.baidu.mapapi.map.BaiduMap;
import com.baidu.mapapi.map.BitmapDescriptor;
import com.baidu.mapapi.map.BitmapDescriptorFactory;
import com.baidu.mapapi.map.MapStatusUpdate;
import com.baidu.mapapi.map.MapStatusUpdateFactory;
import com.baidu.mapapi.map.MapView;
import com.baidu.mapapi.map.MarkerOptions;
import com.baidu.mapapi.map.OverlayOptions;
import com.baidu.mapapi.model.LatLng;
import com.baidu.mapapi.search.route.DrivingRoutePlanOption;
import com.baidu.mapapi.search.route.DrivingRouteResult;
import com.baidu.mapapi.search.route.OnGetRoutePlanResultListener;
import com.baidu.mapapi.search.route.PlanNode;
import com.baidu.mapapi.search.route.RoutePlanSearch;
import com.baidu.mapapi.search.route.TransitRouteResult;
import com.baidu.mapapi.search.route.WalkingRouteResult;
import com.example.aihunqin.R;

public class WenhongLocation extends Activity {
    BaiduMap mBaiduMap = null;
    MapView mMapView = null;
    public LocationClient mLocationClient;
    public MyLocationListener mMyLocationListener;
    public TextView mLocationResult, back;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        SDKInitializer.initialize(getApplicationContext());
        setContentView(R.layout.layout_wenhonglocation);

        back = (TextView) findViewById(R.id.back);
        back.setVisibility(View.VISIBLE);
        back.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                finish();
            }
        });

        mMapView = (MapView) findViewById(R.id.bmapView);
        mBaiduMap = mMapView.getMap();

        mLocationClient = new LocationClient(getApplicationContext());
        mMyLocationListener = new MyLocationListener();
        mLocationClient.registerLocationListener(mMyLocationListener);
        InitLocation();
        mLocationClient.start();

    }

    /**
     * 实现定位回调监听
     * 
     * @author Alex
     * 
     */
    public class MyLocationListener implements BDLocationListener {

        @Override
        public void onReceiveLocation(BDLocation location) {
            // Receive Location
            StringBuffer sb = new StringBuffer(256);
            sb.append("time:");
            sb.append(location.getTime());
            sb.append("
error code:");
            sb.append(location.getLocType());
            sb.append("
latitude:");
            sb.append(location.getLatitude());
            sb.append("
lontitude:");
            sb.append(location.getLongitude());
            sb.append("
radius:");
            sb.append(location.getRadius());
            if (location.getLocType() == BDLocation.TypeNetWorkLocation) {
                sb.append("
addr:");
                sb.append(location.getAddrStr());
                // 运营商信息
                sb.append("
operationers:");
                sb.append(location.getOperators());
            }

            setMarker(location.getLatitude(), location.getLongitude());
            // logMsg(sb.toString());
        }
    }

    void setMarker(double lat, double lng) {
        // 定义Markker坐标点
        LatLng point = new LatLng(lat, lng);
        // 构建Marker图标
        BitmapDescriptor bitmap = BitmapDescriptorFactory
                .fromResource(R.drawable.startpoint);
        // 构建MarkerOption,用于在地图上添加Marker
        OverlayOptions option = new MarkerOptions().position(point)
                .icon(bitmap);
        // 在地图上添加Marker,并显示
        mBaiduMap.addOverlay(option);

        MapStatusUpdate mapstatusupdate = MapStatusUpdateFactory
                .newLatLng(point);

        mBaiduMap.setMapStatus(mapstatusupdate);

        // setRoutePlan(point);
    }

    void setRoutePlan(LatLng point) {
        // 驾车线路规划
        RoutePlanSearch mSearch = RoutePlanSearch.newInstance();
        OnGetRoutePlanResultListener listener = new OnGetRoutePlanResultListener() {

            @Override
            public void onGetWalkingRouteResult(WalkingRouteResult arg0) {
                // 获取步行路线规划结果
            }

            @Override
            public void onGetTransitRouteResult(TransitRouteResult arg0) {
                // 获取公交换乘路径规划结果
            }

            @Override
            public void onGetDrivingRouteResult(DrivingRouteResult arg0) {
                // 获取驾车路线规划结果
            }
        };
        // 设置驾车线路规划检索监听者
        mSearch.setOnGetRoutePlanResultListener(listener);
        // 准备检索起、终点信息
        PlanNode stNode = PlanNode.withLocation(point);
        LatLng endpoint = new LatLng(121.473605, 31.232176);
        PlanNode enNode = PlanNode.withLocation(endpoint);
        mSearch.drivingSearch((new DrivingRoutePlanOption()).from(stNode).to(
                enNode));
    }

    /**
     * 显示请求你字符串
     * 
     * @param str
     */
    public void logMsg(String str) {
        try {
            if (mLocationResult != null)
                mLocationResult.setText(str);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private void InitLocation() {
        LocationClientOption option = new LocationClientOption();
        option.setLocationMode(LocationMode.Battery_Saving);// 设置定位模式
        option.setCoorType("bd09ll");
        option.setIsNeedAddress(true);
        mLocationClient.setLocOption(option);
    }
}