在android中使用高德地图进行定位

（1）获取高德地图android SDK的key

具体过程可以参考：《申请高德地图android SDK的Key》

（2）配置andriod中的manifest文件

（2.1）配置key

<application

        android:allowBackup="true"

        android:icon="@drawable/logo"

        android:label="@string/app_name"

        android:theme="@style/NormalPageTheme" >

        <meta-data

            android:name="com.amap.api.v2.apikey"

            android:value="你的key" />

（2.2）配置权限

    <!--用于进行网络定位-->
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"></uses-permission>
<!--用于访问GPS定位-->
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>
<!-- 获取运营商信息，用于支持提供运营商信息相关的接口-->
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
<!-- 用于访问wifi网络信息，wifi信息会用于进行网络定位-->
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>
<!-- 这个权限用于获取wifi的获取权限，wifi信息会用来进行网络定位-->
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"></uses-permission>
<!--用于访问网络，网络定位需要上网-->
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<!-- 用于读取手机当前的状态-->
<uses-permission android:name="android.permission.READ_PHONE_STATE"></uses-permission>
<!-- 写入扩展存储，向扩展卡写入数据，用于写入缓存定位数据-->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>

（3）Acitivity中使用定位功能

（3.1）Layout中加载MapView对象，在Acitivity中获取MapView对象和Map对象

（3.2）设置定位来源

if (map != null) {
MyLocationStyle locationStyle = new MyLocationStyle();
locationStyle.myLocationIcon(BitmapDescriptorFactory.fromResource(R.drawable.location_marker));
locationStyle.strokeColor(Color.BLACK);
locationStyle.radiusFillColor(Color.argb(100, 0, 0, 180));
locationStyle.strokeWidth(1.0f);
map.setMyLocationStyle(locationStyle);
map.setLocationSource(this);
map.getUiSettings().setMyLocationButtonEnabled(true);
map.setMyLocationEnabled(true);
}

将Activity设置为的定位来源，因此该Activity需要实现接口LocationSource（包括active和disactive）

（3.3）设置位置监听器

public void activate(OnLocationChangedListener listener) {
// TODO Auto-generated method stub
mListener = listener;
if (mlocationClient == null) {
mlocationClient = new AMapLocationClient(this);
mLocationOption = new AMapLocationClientOption();
mlocationClient.setLocationListener(this);
mLocationOption.setLocationMode(AMapLocationMode.Hight_Accuracy);
mlocationClient.setLocationOption(mLocationOption);
mlocationClient.startLocation();
}
}

@Override
public void deactivate() {
// TODO Auto-generated method stub
mListener = null;
if (mlocationClient != null) {
mlocationClient.stopLocation();
mlocationClient.onDestroy();
}
mlocationClient = null;
mLocationOption = null;
}

上面也是将Activity设置为监听对象，因此需要在activity中实现位置监听器的onLocationChanged函数

public void onLocationChanged(AMapLocation amaplocation) {
// TODO Auto-generated method stub
if (amaplocation != null && mListener != null) {
if (amaplocation != null && amaplocation.getErrorCode() == 0) {
mListener.onLocationChanged(amaplocation);
}
else {
String errText = "failed to locate," + amaplocation.getErrorCode()+ ": " 
+ amaplocation.getErrorInfo();
Log.e("error",errText);
}

}
}

（3.5）定位成功

（4）如果出现“无法启动定位服务的错误”

此时，errorCode返回值为10，这个因为你把该Activity放在TabHost中进行渲染。你需要将创建LocationClient

mlocationClient = new AMapLocationClient(this);

这句代码改成

mlocationClient = new AMapLocationClient(getApplicationContext());

如果你的Activity不是放在TabHost进行渲染，则不需要进行上面的改动。

（5）完整的代码

package com.example.allsamples;

import android.R.color;
import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.location.Location;

import com.amap.api.location.AMapLocation;
import com.amap.api.location.AMapLocationClient;
import com.amap.api.location.AMapLocationClientOption;
import com.amap.api.location.AMapLocationClientOption.AMapLocationMode;
import com.amap.api.location.AMapLocationListener;
import com.amap.api.maps2d.AMap;
import com.amap.api.maps2d.CameraUpdate;
import com.amap.api.maps2d.CameraUpdateFactory;
import com.amap.api.maps2d.LocationSource;
import com.amap.api.maps2d.MapView;
import com.amap.api.maps2d.model.BitmapDescriptorFactory;
import com.amap.api.maps2d.model.CameraPosition;
import com.amap.api.maps2d.model.LatLng;
import com.amap.api.maps2d.model.MyLocationStyle;

//终于找到报错“10: 定位服务启动失败”的问题
//这个MapActivity放置的位置有关系，当Activity放在TabSpec中就有问题
//如果单独作为一个activity则没有问题
public class MapActivity extends Activity implements LocationSource,
AMapLocationListener{
private MapView mapView;
private AMap map;

//定位功能
private OnLocationChangedListener mListener;
private AMapLocationClient mlocationClient;
private AMapLocationClientOption mLocationOption;

@Override
protected void onCreate(Bundle savedInstanceState) {

// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.forum_home_page);
mapView = (MapView)findViewById(R.id.mapview);
mapView.onCreate(savedInstanceState);
map = mapView.getMap();

//修改地图的中心点位置
CameraPosition cp = map.getCameraPosition();
CameraPosition cpNew = CameraPosition.fromLatLngZoom(new LatLng(31.22, 121.48), cp.zoom);
CameraUpdate cu = CameraUpdateFactory.newCameraPosition(cpNew);
map.moveCamera(cu);

//初始化定位服务
initLocationService();

}

//初始化定位服务,这个地方有错误，这个地方map已经初始化
//因此定位的初始化代码就进不去了。
private void initLocationService() {
if (map != null) {
MyLocationStyle locationStyle = new MyLocationStyle();
locationStyle.myLocationIcon(BitmapDescriptorFactory.fromResource(R.drawable.location_marker));
locationStyle.strokeColor(Color.BLACK);
locationStyle.radiusFillColor(Color.argb(100, 0, 0, 180));
locationStyle.strokeWidth(1.0f);
map.setMyLocationStyle(locationStyle);
map.setLocationSource(this);
map.getUiSettings().setMyLocationButtonEnabled(true);
map.setMyLocationEnabled(true);
}
}

@Override
protected void onResume() {
// TODO Auto-generated method stub
mapView.onResume();
super.onResume();
}

@Override
protected void onPause() {
// TODO Auto-generated method stub
mapView.onPause();
deactivate();
super.onPause();
}

@Override
protected void onDestroy() {
// TODO Auto-generated method stub
mapView.onDestroy();
super.onDestroy();
}

@Override
protected void onSaveInstanceState(Bundle outState) {
// TODO Auto-generated method stub
mapView.onSaveInstanceState(outState);
super.onSaveInstanceState(outState);
}

@Override
public void onLocationChanged(AMapLocation amaplocation) {
// TODO Auto-generated method stub
if (amaplocation != null && mListener != null) {
if (amaplocation != null && amaplocation.getErrorCode() == 0) {
mListener.onLocationChanged(amaplocation);
}
else {
String errText = "failed to locate," + amaplocation.getErrorCode()+ ": "
+ amaplocation.getErrorInfo();
Log.e("error",errText);
}

}
}

@Override
public void activate(OnLocationChangedListener listener) {
// TODO Auto-generated method stub
mListener = listener;
if (mlocationClient == null) {
mlocationClient = new AMapLocationClient(getApplicationContext());
mLocationOption = new AMapLocationClientOption();
mlocationClient.setLocationListener(this);
mLocationOption.setLocationMode(AMapLocationMode.Hight_Accuracy);
mlocationClient.setLocationOption(mLocationOption);
mlocationClient.startLocation();
}
}

@Override
public void deactivate() {
// TODO Auto-generated method stub
mListener = null;
if (mlocationClient != null) {
mlocationClient.stopLocation();
mlocationClient.onDestroy();
}
mlocationClient = null;
mLocationOption = null;
}

}