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

        android:allowBackup="true"
        android:icon="@drawable/logo"
        android:label="@string/app_name"
        android:theme="@style/NormalPageTheme" >
                    android:name="com.amap.api.v2.apikey"
            android:value="你的key" />

（2.2）配置权限

   

（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;
	}
	
	
}