android以后台service的方式获取GPRS数据

在配备Android系统的手机中，一般都配备了GPS设备。Android为我们获取GPS数据提供了很好的接口。本文来说一下如何使用Android获取GPS的经纬度。

1 从Service继承一个类。
2 创建startService()方法。
3 创建endService()方法重载onCreate方法和onDestroy方法，并在这两个方法里面来调用startService以及endService。
4 在startService中，通过getSystemService方法获取Context.LOCATION_SERVICE。
5 基于LocationListener实现一个新类。默认将重载四个方法onLocationChanged、onProviderDisabled、onProviderEnabled、onStatusChanged。对于onLocationChanged方法是我们更新最新的GPS数据的方法。一般我们的操作都只需要在这里进行处理。
6 调用LocationManager的requestLocationUpdates方法，来定期触发获取GPS数据即可。在onLocationChanged函数里面可以实现我们对得到的经纬度的最终操作。
7 最后在我们的Activity里面通过按钮来启动Service，停止Service。

示意代码如下：

package com.jouhu.gpsservice; import android.app.Service;import android.content.Context;import android.content.Intent;import android.location.LocationListener;import android.location.LocationManager;import android.os.Binder;import android.os.IBinder;import android.util.Log; public class GPSService extends Service {     //2000ms    private static final long minTime = 2000;    //最小变更距离 10m    private static final float minDistance = 10;     String tag = this.toString();     private LocationManager locationManager;    private LocationListener locationListener;     private final IBinder mBinder = new GPSServiceBinder();     public void startService()    {        locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);        locationListener = new GPSServiceListener();        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, minTime, minDistance, locationListener);    }     public void endService()    {        if(locationManager != null && locationListener != null)        {            locationManager.removeUpdates(locationListener);        }    }     @Override    public IBinder onBind(Intent arg0) {        // TODO Auto-generated method stub        return mBinder;    }     @Override    public void onCreate()    {        //        startService();        Log.v(tag, "GPSService Started.");    }     @Override    public void onDestroy()    {        endService();        Log.v(tag, "GPSService Ended.");    }     public class GPSServiceBinder extends Binder {        GPSService getService() {            return GPSService.this;        }    }}

GPRSServiceListener的实现：

package com.jouhu.gpsservice; import java.text.DateFormat;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.GregorianCalendar;import java.util.TimeZone; import android.location.Location;import android.location.LocationListener;import android.location.LocationProvider;import android.os.Bundle;import android.util.Log;import android.widget.Toast; public class GPSServiceListener implements LocationListener {     private static final String tag = "GPSServiceListener";    private static final float minAccuracyMeters = 35;    private static final String hostUrl = "http://doandroid.info/gpsservice/position.php?";    private static final String user = "huzhangyou";    private static final String pass = "123456";    private static final int duration = 10;    private final DateFormat timestampFormat = new SimpleDateFormat("yyyyMMddHHmmss");     public int GPSCurrentStatus;     @Override    public void onLocationChanged(Location location) {        // TODO Auto-generated method stub        if(location != null)        {            if (location.hasAccuracy() && location.getAccuracy() <= minAccuracyMeters)            {                //获取时间参数,将时间一并Post到服务器端                GregorianCalendar greg = new GregorianCalendar();                TimeZone tz = greg.getTimeZone();                int offset = tz.getOffset(System.currentTimeMillis());                greg.add(Calendar.SECOND, (offset/1000) * -1);                StringBuffer strBuffer = new StringBuffer();                strBuffer.append(hostUrl);                strBuffer.append("user=");                strBuffer.append(user);                strBuffer.append("&pass=");                strBuffer.append(pass);                strBuffer.append("&Latitude=");                strBuffer.append(location.getLatitude());                strBuffer.append("&Longitude=");                strBuffer.append(location.getLongitude());                strBuffer.append("&Time=");                strBuffer.append(timestampFormat.format(greg.getTime()));                strBuffer.append("&Speed=");                strBuffer.append(location.hasSpeed());                doGet(strBuffer.toString());                Log.v(tag, strBuffer.toString());            }        }    }     //将数据通过get的方式发送到服务器,服务器可以根据这个数据进行跟踪用户的行走状态    private void doGet(String string) {        // TODO Auto-generated method stub        //    }     @Override    public void onProviderDisabled(String provider) {        // TODO Auto-generated method stub    }     @Override    public void onProviderEnabled(String provider) {        // TODO Auto-generated method stub     }     @Override    public void onStatusChanged(String provider, int status, Bundle extras)    {        // TODO Auto-generated method stub        GPSCurrentStatus = status;    } }

原文地址： http://www.189works.com/article-34133-1.html

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