百度地图定位

上中心代码

package baidumapsdk.demo;

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

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.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.MyLocationConfiguration;
import com.baidu.mapapi.map.MyLocationConfiguration.LocationMode;
import com.baidu.mapapi.map.MyLocationData;
import com.baidu.mapapi.model.LatLng;

/**
 * 此demo用来展示如何结合定位SDK实现定位，并使用MyLocationOverlay绘制定位位置 同时展示如何使用自定义图标绘制并点击时弹出泡泡
 * 
 */
public class LocationDemo extends Activity {

    // 定位相关
    LocationClient mLocClient;
    public MyLocationListenner myListener = new MyLocationListenner();
    private LocationMode mCurrentMode;
    BitmapDescriptor mCurrentMarker;

    MapView mMapView;
    BaiduMap mBaiduMap;

    // UI相关
    OnCheckedChangeListener radioButtonListener;
    Button requestLocButton;
    boolean isFirstLoc = true;// 是否首次定位

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_location);
        requestLocButton = (Button) findViewById(R.id.button1);
        mCurrentMode = LocationMode.NORMAL;
        requestLocButton.setText("普通");
        OnClickListener btnClickListener = new OnClickListener() {
            public void onClick(View v) {
                switch (mCurrentMode) {
                case NORMAL:
                    requestLocButton.setText("跟随");
                    mCurrentMode = LocationMode.FOLLOWING;
                    mBaiduMap
                            .setMyLocationConfigeration(new MyLocationConfiguration(
                                    mCurrentMode, true, mCurrentMarker));
                    break;
                case COMPASS:
                    requestLocButton.setText("普通");
                    mCurrentMode = LocationMode.NORMAL;
                    mBaiduMap
                            .setMyLocationConfigeration(new MyLocationConfiguration(
                                    mCurrentMode, true, mCurrentMarker));
                    break;
                case FOLLOWING:
                    requestLocButton.setText("罗盘");
                    mCurrentMode = LocationMode.COMPASS;
                    mBaiduMap
                            .setMyLocationConfigeration(new MyLocationConfiguration(
                                    mCurrentMode, true, mCurrentMarker));
                    break;
                }
            }
        };
        requestLocButton.setOnClickListener(btnClickListener);

        RadioGroup group = (RadioGroup) this.findViewById(R.id.radioGroup);
        radioButtonListener = new OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                if (checkedId == R.id.defaulticon) {
                    // 传入null则，恢复默认图标
                    mCurrentMarker = null;
                    mBaiduMap
                            .setMyLocationConfigeration(new MyLocationConfiguration(
                                    mCurrentMode, true, null));
                }
                if (checkedId == R.id.customicon) {
                    // 修改为自定义marker
                    mCurrentMarker = BitmapDescriptorFactory
                            .fromResource(R.drawable.icon_geo);
                    mBaiduMap
                            .setMyLocationConfigeration(new MyLocationConfiguration(
                                    mCurrentMode, true, mCurrentMarker));
                }
            }
        };
        group.setOnCheckedChangeListener(radioButtonListener);

        // 地图初始化
        mMapView = (MapView) findViewById(R.id.bmapView);
        mBaiduMap = mMapView.getMap();
        // 开启定位图层
        mBaiduMap.setMyLocationEnabled(true);
        // 定位初始化
        mLocClient = new LocationClient(this);
        mLocClient.registerLocationListener(myListener);
        LocationClientOption option = new LocationClientOption();
        option.setOpenGps(true);// 打开gps
        option.setCoorType("bd09ll"); // 设置坐标类型
        option.setScanSpan(1000);
        mLocClient.setLocOption(option);
        mLocClient.start();
    }

    /**
     * 定位SDK监听函数
     */
    public class MyLocationListenner implements BDLocationListener {

        @Override
        public void onReceiveLocation(BDLocation location) {
            // map view 销毁后不在处理新接收的位置
            if (location == null || mMapView == null)
                return;
            MyLocationData locData = new MyLocationData.Builder()
                    .accuracy(location.getRadius())
                    // 此处设置开发者获取到的方向信息，顺时针0-360
                    .direction(100).latitude(location.getLatitude())
                    .longitude(location.getLongitude()).build();
            mBaiduMap.setMyLocationData(locData);
            if (isFirstLoc) {
                isFirstLoc = false;
                LatLng ll = new LatLng(location.getLatitude(),
                        location.getLongitude());
                MapStatusUpdate u = MapStatusUpdateFactory.newLatLng(ll);
                mBaiduMap.animateMapStatus(u);
            }
        }

        public void onReceivePoi(BDLocation poiLocation) {
        }
    }

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

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

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

}

1、声明一个LocationClient 定位服务的客户端。宿主程序在客户端声明此类，并调用（客户端通过这个控制定位）

// 定位相关
LocationClient mLocClient;

在onCreate方法里

@Override
public void onCreate(Bundle savedInstanceState) {

// 定位初始化
mLocClient = new LocationClient(this);

mLocClient.registerLocationListener(myListener);

方法解析

registerLocationListener

public void registerLocationListener(BDLocationListener listener)
注册定位监听函数
参数：
BDLocation类 -

LocationClientOption option = new LocationClientOption();
        option.setOpenGps(true);// 打开gps
        option.setCoorType("bd09ll"); // 设置坐标类型
        option.setScanSpan(1000);
        mLocClient.setLocOption(option);
        mLocClient.start();

上面就是设置gps坐标类型添加到mLocClient 里面

在listener里编写定位信息

public class MyLocationListenner implements BDLocationListener {

        @Override
        public void onReceiveLocation(BDLocation location) {
            // map view 销毁后不在处理新接收的位置
            if (location == null || mMapView == null)
                return;
            MyLocationData locData = new MyLocationData.Builder()
                    .accuracy(location.getRadius())
                    // 此处设置开发者获取到的方向信息，顺时针0-360
                    .direction(100).latitude(location.getLatitude())
                    .longitude(location.getLongitude()).build();
            mBaiduMap.setMyLocationData(locData);
            if (isFirstLoc) {
                isFirstLoc = false;
                LatLng ll = new LatLng(location.getLatitude(),
                        location.getLongitude());
                MapStatusUpdate u = MapStatusUpdateFactory.newLatLng(ll);
                mBaiduMap.animateMapStatus(u);
            }
        }

        public void onReceivePoi(BDLocation poiLocation) {
        }
    }

然后需要添加一句

// 开启定位图层
mBaiduMap.setMyLocationEnabled(true);

这句很重要，时间紧迫，有点粗略，以后修改讲解。