AGps.java

package com.az.Location;

import android.content.Context;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;

public class AGps{
	private Location location = null;
	private LocationManager locationManager = null;
	private Context context = null;

	/**
	 * ��ʼ�� 
	 * 
	 * @param ctx
	 */
	public AGps(Context ctx) {
		context=ctx;
		Log.i("cathon", "initgps ");
		locationManager=(LocationManager)context.getSystemService(Context.LOCATION_SERVICE);
		
		Log.i("cathon", "initgps 2 ");
		//location = locationManager.getLastKnownLocation(getProvider());		//cathon xiong
		Log.i("cathon", "initgps 3 ");
		//locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 2000, 10, locationListener);
		Log.i("cathon", "initgps end ");
	}


	// ��ȡLocation Provider
	private String getProvider() {
		// ����λ�ò�ѯ����
		Criteria criteria = new Criteria();
		// ��ѯ���ȣ���
		criteria.setAccuracy(Criteria.ACCURACY_FINE);
		// �Ƿ��ѯ��������
		criteria.setAltitudeRequired(false);
		// �Ƿ��ѯ��λ�� : ��
		criteria.setBearingRequired(false);
		// �Ƿ������ѣ���
		criteria.setCostAllowed(true);
		// ����Ҫ�󣺵�
		criteria.setPowerRequirement(Criteria.POWER_LOW);
		// ��������ʵķ���������provider����2������Ϊtrue˵�� , ���ֻ��һ��provider����Ч��,�򷵻ص�ǰprovider
		return locationManager.getBestProvider(criteria, true);
	}

	private LocationListener locationListener = new LocationListener() {
		// λ�÷����ı�����
		public void onLocationChanged(Location l) {
			if(l!=null){
				location=l;
			}
		}

		// provider ���û��رպ����
		public void onProviderDisabled(String provider) {
			location=null;
		}

		// provider ���û����������
		public void onProviderEnabled(String provider) {
			Location l = locationManager.getLastKnownLocation(provider);
			if(l!=null){
				location=l;
			}
				
		}

		// provider ״̬�仯ʱ����
		public void onStatusChanged(String provider, int status, Bundle extras) {
		}

	};
	
	public Location getLocation(){
		return location;
	}
	
	public void closeLocation(){
		if(locationManager!=null){
			if(locationListener!=null){
				locationManager.removeUpdates(locationListener);
				locationListener=null;
			}
			locationManager=null;
		}
	}


}