Android Service获取当前位置(GPS+基站)

需求详情： 1)、Service中每隔1秒执行一次定位操作(GPS+基站) 2)、定位的结果实时显示在界面上(要求得到经度、纬度) 技术支持： 1)、获取经纬度 通过GPS+基站获取经纬度，先通过GPS来获取，如果为空改用基站进行获取–>GPS+基站(基站获取支持联通、电信、移动)。 2)、实时获取经纬度 为了达到实时获取经纬度，需在后台启动获取经纬度的Service，然后把经纬度数据通过广播发送出去，在需要的地方进行广播注册(比如在Activity中注册广播，显示在界面中)–>涉及到Service+BroadcastReceiver+Activity+Thread等知识点。

备注：本文注重实践，如有看不懂的，先去巩固下知识点，可以去看看我前面写的几篇文章。

1、CellInfo实体类–>基站信息

package com.ljq.activity;
 
/**
 * 基站信息
 * 
 * @author jiqinlin
 * 
 */
public class CellInfo {
 /** 基站id，用来找到基站的位置 */private int cellId;
 /** 移动国家码，共3位，中国为460，即imsi前3位 */private String mobileCountryCode="460";
 /** 移动网络码，共2位，在中国，移动的代码为00和02，联通的代码为01，电信的代码为03，即imsi第4~5位 */private String mobileNetworkCode="0";
 /** 地区区域码 */private int locationAreaCode;
 /** 信号类型[选 gsm|cdma|wcdma] */private String radioType="";
 
 public CellInfo() {
 }
 
 public int getCellId() {
  return cellId;
 }
 
 public void setCellId(int cellId) {
  this.cellId = cellId;
 }
 
 public String getMobileCountryCode() {
  return mobileCountryCode;
 }
 
 public void setMobileCountryCode(String mobileCountryCode) {
  this.mobileCountryCode = mobileCountryCode;
 }
 
 public String getMobileNetworkCode() {
  return mobileNetworkCode;
 }
 
 public void setMobileNetworkCode(String mobileNetworkCode) {
  this.mobileNetworkCode = mobileNetworkCode;
 }
 
 public int getLocationAreaCode() {
  return locationAreaCode;
 }
 
 public void setLocationAreaCode(int locationAreaCode) {
  this.locationAreaCode = locationAreaCode;
 }
 
 public String getRadioType() {
  return radioType;
 }
 
 public void setRadioType(String radioType) {
  this.radioType = radioType;
 }
 
}

2、Gps类–>Gps封装类，用来获取经纬度

package com.ljq.activity;
 
import android.content.Context;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
 
public class Gps{
 private Location location = null;
 private LocationManager locationManager = null;
 private Context context = null;
 
 /**
  * 初始化 
  * 
  * @param ctx
  */public Gps(Context ctx) {
  context=ctx;
  locationManager=(LocationManager)context.getSystemService(Context.LOCATION_SERVICE);
  location = locationManager.getLastKnownLocation(getProvider());
  locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 2000, 10, locationListener);
 }
 
 
 // 获取Location Provider
 private String getProvider() {
  // 构建位置查询条件
  Criteria criteria = new Criteria();
  // 查询精度：高
  criteria.setAccuracy(Criteria.ACCURACY_FINE);
  // 是否查询海拨：否
  criteria.setAltitudeRequired(false);
  // 是否查询方位角 : 否
  criteria.setBearingRequired(false);
  // 是否允许付费：是
  criteria.setCostAllowed(true);
  // 电量要求：低
  criteria.setPowerRequirement(Criteria.POWER_LOW);
  // 返回最合适的符合条件的provider，第2个参数为true说明 , 如果只有一个provider是有效的,则返回当前provider
  return locationManager.getBestProvider(criteria, true);
 }
 
 private LocationListener locationListener = new LocationListener() {
  // 位置发生改变后调用
  public void onLocationChanged(Location l) {
   if(l!=null){
    location=l;
   }
  }
 
  // provider 被用户关闭后调用
  public void onProviderDisabled(String provider) {
   location=null;
  }
 
  // provider 被用户开启后调用
  public void onProviderEnabled(String provider) {
   Location l = locationManager.getLastKnownLocation(provider);
   if(l!=null){
    location=l;
   }
     
  }
 
  // provider 状态变化时调用
  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;
  }
 }
 
 
}

3、GpsService服务类

package com.ljq.activity;
 
import java.util.ArrayList;
 
import android.app.Service;
import android.content.Intent;
import android.location.Location;
import android.os.IBinder;
import android.util.Log;
 
public class GpsService extends Service {
 ArrayList<CellInfo> cellIds = null;
 private Gps gps=null;
 private boolean threadDisable=false; 
 private final static String TAG=GpsService.class.getSimpleName();
 
 @Override
 public void onCreate() {
  super.onCreate();
   
  gps=new Gps(GpsService.this);
  cellIds=UtilTool.init(GpsService.this);
   
  new Thread(new Runnable(){
   @Override
   public void run() {
    while (!threadDisable) { 
     try {
      Thread.sleep(1000);
     } catch (InterruptedException e) {
      e.printStackTrace();
     }
      
     if(gps!=null){ //当结束服务时gps为空
      //获取经纬度
      Location location=gps.getLocation();
      //如果gps无法获取经纬度，改用基站定位获取
      if(location==null){
       Log.v(TAG, "gps location null"); 
       //2.根据基站信息获取经纬度
       try {
        location = UtilTool.callGear(GpsService.this, cellIds);
       } catch (Exception e) {
        location=null;
        e.printStackTrace();
       }
       if(location==null){
        Log.v(TAG, "cell location null"); 
       }
      }
       
      //发送广播
      Intent intent=new Intent();
      intent.putExtra("lat", location==null?"":location.getLatitude()+""); 
      intent.putExtra("lon", location==null?"":location.getLongitude()+""); 
      intent.setAction("com.ljq.activity.GpsService"); 
      sendBroadcast(intent);
     }
 
    }
   }
  }).start();
   
 }
 
 @Override
 public void onDestroy() {
  threadDisable=true;
  if(cellIds!=null&&cellIds.size()>0){
   cellIds=null;
  }
  if(gps!=null){
   gps.closeLocation();
   gps=null;
  }
  super.onDestroy();
 }
 
 @Override
 public IBinder onBind(Intent arg0) {
  return null;
 }
 
 
}

4、GpsActivity–>在界面上实时显示经纬度数据

package com.ljq.activity;
 
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.location.Location;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;
import android.widget.EditText;
import android.widget.Toast;
 
public class GpsActivity extends Activity {
 private Double homeLat=26.0673834d; //宿舍纬度
 private Double homeLon=119.3119936d; //宿舍经度
 private EditText editText = null;
 private MyReceiver receiver=null; 
 private final static String TAG=GpsActivity.class.getSimpleName();
 
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
   
  editText=(EditText)findViewById(R.id.editText);
   
  //判断GPS是否可用
  Log.i(TAG, UtilTool.isGpsEnabled((LocationManager)getSystemService(Context.LOCATION_SERVICE))+"");
  if(!UtilTool.isGpsEnabled((LocationManager)getSystemService(Context.LOCATION_SERVICE))){
   Toast.makeText(this, "GSP当前已禁用，请在您的系统设置屏幕启动。", Toast.LENGTH_LONG).show();
   Intent callGPSSettingIntent = new Intent(android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);  
   startActivity(callGPSSettingIntent);
            return;
  }   
   
  //启动服务
  startService(new Intent(this, GpsService.class));
   
  //注册广播
  receiver=new MyReceiver();
  IntentFilter filter=new IntentFilter();
  filter.addAction("com.ljq.activity.GpsService");
  registerReceiver(receiver, filter);
 }
  
 //获取广播数据
 private class MyReceiver extends BroadcastReceiver{
  @Override
  public void onReceive(Context context, Intent intent) {
   Bundle bundle=intent.getExtras();      
   String lon=bundle.getString("lon");    
   String lat=bundle.getString("lat"); 
   if(lon!=null&&!"".equals(lon)&&lat!=null&&!"".equals(lat)){
    double distance=getDistance(Double.parseDouble(lat), 
      Double.parseDouble(lon), homeLat, homeLon);
    editText.setText("目前经纬度\n经度："+lon+"\n纬度："+lat+"\n离宿舍距离："+java.lang.Math.abs(distance));
   }else{
    editText.setText("目前经纬度\n经度："+lon+"\n纬度："+lat);
   }
  }
 }
  
 @Override
 protected void onDestroy() {
  //注销服务
  unregisterReceiver(receiver);
  //结束服务，如果想让服务一直运行就注销此句
  stopService(new Intent(this, GpsService.class));
  super.onDestroy();
 }
  
 /**
  * 把经纬度换算成距离
  * 
  * @param lat1 开始纬度
  * @param lon1 开始经度
  * @param lat2 结束纬度
  * @param lon2 结束经度
  * @return*/private double getDistance(double lat1, double lon1, double lat2, double lon2) {
  float[] results = new float[1];
  Location.distanceBetween(lat1, lon1, lat2, lon2, results);
  return results[0];
 }  
}

5、UtilTool–>工具类

package com.ljq.activity;
 
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;
import java.util.Locale;
 
import org.apache.http.client.ClientProtocolException;
import org.json.JSONException;
import org.json.JSONObject;
 
import android.content.Context;
import android.location.Location;
import android.location.LocationManager;
import android.telephony.NeighboringCellInfo;
import android.telephony.TelephonyManager;
import android.telephony.cdma.CdmaCellLocation;
import android.telephony.gsm.GsmCellLocation;
import android.util.Log;
import android.widget.Toast;
 
public class UtilTool {
 public static boolean isGpsEnabled(LocationManager locationManager) {
  boolean isOpenGPS = locationManager.isProviderEnabled(android.location.LocationManager.GPS_PROVIDER);
  boolean isOpenNetwork = locationManager.isProviderEnabled(android.location.LocationManager.NETWORK_PROVIDER);
  if (isOpenGPS || isOpenNetwork) {
   return true;
  }
  return false;
 } 
  
    /**
     * 根据基站信息获取经纬度 
     * 
     * 原理向http://www.google.com/loc/json发送http的post请求，根据google返回的结果获取经纬度
     * 
     * @param cellIds
     * @return
     * @throws Exception 
     */public static Location callGear(Context ctx, ArrayList<CellInfo> cellIds) throws Exception {
     String result="";
     JSONObject data=null;
     if (cellIds == null||cellIds.size()==0) {
      UtilTool.alert(ctx, "cell request param null");
      return null;
     };
      
  try {
   result = UtilTool.getResponseResult(ctx, "http://www.google.com/loc/json", cellIds);
    
   if(result.length() <= 1)
    return null;
   data = new JSONObject(result);
   data = (JSONObject) data.get("location");
 
   Location loc = new Location(LocationManager.NETWORK_PROVIDER);
   loc.setLatitude((Double) data.get("latitude"));
   loc.setLongitude((Double) data.get("longitude"));
   loc.setAccuracy(Float.parseFloat(data.get("accuracy").toString()));
   loc.setTime(UtilTool.getUTCTime());
   return loc;
  } catch (JSONException e) {
   return null;
  } catch (UnsupportedEncodingException e) {
   e.printStackTrace();
  } catch (ClientProtocolException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }
  return null;
 }
 
    /**
     * 接收Google返回的数据格式
     * 
  * 出参：{"location":{"latitude":26.0673834,"longitude":119.3119936,
  *       "address":{"country":"中国","country_code":"CN","region":"福建省","city":"福州市",
  *       "street":"五一中路","street_number":"128号"},"accuracy":935.0},
  *       "access_token":"2:xiU8YrSifFHUAvRJ:aj9k70VJMRWo_9_G"}
  * 请求路径：http://maps.google.cn/maps/geo?key=abcdefg&q=26.0673834,119.3119936
     * 
     * @param cellIds
     * @return
     * @throws UnsupportedEncodingException
     * @throws MalformedURLException
     * @throws IOException
     * @throws ProtocolException
     * @throws Exception
     */public static String getResponseResult(Context ctx,String path, ArrayList<CellInfo> cellInfos)
   throws UnsupportedEncodingException, MalformedURLException,
   IOException, ProtocolException, Exception {
  String result="";
  Log.i(ctx.getApplicationContext().getClass().getSimpleName(), 
    "in param: "+getRequestParams(cellInfos));
  InputStream inStream=UtilTool.sendPostRequest(path, 
    getRequestParams(cellInfos), "UTF-8");
  if(inStream!=null){
   byte[] datas=UtilTool.readInputStream(inStream);
   if(datas!=null&&datas.length>0){
    result=new String(datas, "UTF-8");
    //Log.i(ctx.getClass().getSimpleName(), "receive result:"+result);//服务器返回的结果信息
    Log.i(ctx.getApplicationContext().getClass().getSimpleName(), 
        "google cell receive data result:"+result);
   }else{
    Log.i(ctx.getApplicationContext().getClass().getSimpleName(), 
      "google cell receive data null");
   }
  }else{
   Log.i(ctx.getApplicationContext().getClass().getSimpleName(), 
       "google cell receive inStream null");
  }
  return result;
 }
     
  
 /**
  * 拼装json请求参数，拼装基站信息
  * 
  * 入参：{'version': '1.1.0','host': 'maps.google.com','home_mobile_country_code': 460,
  *       'home_mobile_network_code': 14136,'radio_type': 'cdma','request_address': true,
  *       'address_language': 'zh_CN','cell_towers':[{'cell_id': '12835','location_area_code': 6,
  *       'mobile_country_code': 460,'mobile_network_code': 14136,'age': 0}]}
  * @param cellInfos
  * @return*/public static String getRequestParams(List<CellInfo> cellInfos){
  StringBuffer sb=new StringBuffer("");
  sb.append("{");
  if(cellInfos!=null&&cellInfos.size()>0){
   sb.append("'version': '1.1.0',"); //google api 版本[必]
   sb.append("'host': 'maps.google.com',"); //服务器域名[必]
   sb.append("'home_mobile_country_code': "+cellInfos.get(0).getMobileCountryCode()+","); //移动用户所属国家代号[选 中国460]
   sb.append("'home_mobile_network_code': "+cellInfos.get(0).getMobileNetworkCode()+","); //移动系统号码[默认0]
   sb.append("'radio_type': '"+cellInfos.get(0).getRadioType()+"',"); //信号类型[选 gsm|cdma|wcdma]
   sb.append("'request_address': true,"); //是否返回数据[必]
   sb.append("'address_language': 'zh_CN',"); //反馈数据语言[选 中国 zh_CN]
   sb.append("'cell_towers':["); //移动基站参数对象[必]
   for(CellInfo cellInfo:cellInfos){
    sb.append("{");
    sb.append("'cell_id': '"+cellInfo.getCellId()+"',"); //基站ID[必]
    sb.append("'location_area_code': "+cellInfo.getLocationAreaCode()+","); //地区区域码[必]
    sb.append("'mobile_country_code': "+cellInfo.getMobileCountryCode()+","); 
    sb.append("'mobile_network_code': "+cellInfo.getMobileNetworkCode()+",");
    sb.append("'age': 0"); //使用好久的数据库[选 默认0表示使用最新的数据库]
    sb.append("},");
   }
   sb.deleteCharAt(sb.length()-1);
   sb.append("]");
  }
  sb.append("}");
  return sb.toString();
 }
     
 /**
  * 获取UTC时间
  * 
  * UTC + 时区差 ＝ 本地时间(北京为东八区)
  * 
  * @return*/public static long getUTCTime() { 
     //取得本地时间
        Calendar cal = Calendar.getInstance(Locale.CHINA);
        //取得时间偏移量
        int zoneOffset = cal.get(java.util.Calendar.ZONE_OFFSET); 
        //取得夏令时差
        int dstOffset = cal.get(java.util.Calendar.DST_OFFSET); 
        //从本地时间里扣除这些差量，即可以取得UTC时间
        cal.add(java.util.Calendar.MILLISECOND, -(zoneOffset + dstOffset)); 
        return cal.getTimeInMillis();
    }
 /**
  * 初始化，记得放在onCreate()方法里初始化，获取基站信息
  * 
  * @return*/public static ArrayList<CellInfo> init(Context ctx) {
  ArrayList<CellInfo> cellInfos = new ArrayList<CellInfo>();
   
  TelephonyManager tm = (TelephonyManager) ctx.getSystemService(Context.TELEPHONY_SERVICE);
  //网络制式
  int type = tm.getNetworkType();
      /**
     * 获取SIM卡的IMSI码
     * SIM卡唯一标识：IMSI 国际移动用户识别码（IMSI：International Mobile Subscriber Identification Number）是区别移动用户的标志，
     * 储存在SIM卡中，可用于区别移动用户的有效信息。IMSI由MCC、MNC、MSIN组成，其中MCC为移动国家号码，由3位数字组成，
     * 唯一地识别移动客户所属的国家，我国为460；MNC为网络id，由2位数字组成，
     * 用于识别移动客户所归属的移动网络，中国移动为00，中国联通为01,中国电信为03；MSIN为移动客户识别码，采用等长11位数字构成。
     * 唯一地识别国内GSM移动通信网中移动客户。所以要区分是移动还是联通，只需取得SIM卡中的MNC字段即可
   */
  String imsi = tm.getSubscriberId(); 
  alert(ctx, "imsi: "+imsi);
  //为了区分移动、联通还是电信，推荐使用imsi来判断(万不得己的情况下用getNetworkType()判断，比如imsi为空时)
  if(imsi!=null&&!"".equals(imsi)){ 
   alert(ctx, "imsi");
   if (imsi.startsWith("46000") || imsi.startsWith("46002")) {// 因为移动网络编号46000下的IMSI已经用完，所以虚拟了一个46002编号，134/159号段使用了此编号
    // 中国移动
    mobile(cellInfos, tm);
   } else if (imsi.startsWith("46001")) {
    // 中国联通
    union(cellInfos, tm);
   } else if (imsi.startsWith("46003")) {
    // 中国电信
    cdma(cellInfos, tm);
   }   
  }else{
   alert(ctx, "type");
   // 在中国，联通的3G为UMTS或HSDPA，电信的3G为EVDO
   // 在中国，移动的2G是EGDE，联通的2G为GPRS，电信的2G为CDMA
   // String OperatorName = tm.getNetworkOperatorName(); 
    
   //中国电信 
   if (type == TelephonyManager.NETWORK_TYPE_EVDO_A 
     || type == TelephonyManager.NETWORK_TYPE_EVDO_0
     || type == TelephonyManager.NETWORK_TYPE_CDMA 
     || type ==TelephonyManager.NETWORK_TYPE_1xRTT){
    cdma(cellInfos, tm);
   }
   //移动(EDGE（2.75G）是GPRS（2.5G）的升级版，速度比GPRS要快。目前移动基本在国内升级普及EDGE，联通则在大城市部署EDGE。)
   else if(type == TelephonyManager.NETWORK_TYPE_EDGE
     || type == TelephonyManager.NETWORK_TYPE_GPRS ){
    mobile(cellInfos, tm);
   }
   //联通(EDGE（2.75G）是GPRS（2.5G）的升级版，速度比GPRS要快。目前移动基本在国内升级普及EDGE，联通则在大城市部署EDGE。)
   else if(type == TelephonyManager.NETWORK_TYPE_GPRS
     ||type == TelephonyManager.NETWORK_TYPE_EDGE
     ||type == TelephonyManager.NETWORK_TYPE_UMTS
     ||type == TelephonyManager.NETWORK_TYPE_HSDPA){
    union(cellInfos, tm);
   }
  }
   
  return cellInfos;
 }
 
 
 /**
  * 电信
  * 
  * @param cellInfos
  * @param tm
  */private static void cdma(ArrayList<CellInfo> cellInfos, TelephonyManager tm) {
  CdmaCellLocation location = (CdmaCellLocation) tm.getCellLocation();
  CellInfo info = new CellInfo();
  info.setCellId(location.getBaseStationId());
  info.setLocationAreaCode(location.getNetworkId());
  info.setMobileNetworkCode(String.valueOf(location.getSystemId()));
  info.setMobileCountryCode(tm.getNetworkOperator().substring(0, 3));
  info.setRadioType("cdma");
  cellInfos.add(info);
   
  //前面获取到的都是单个基站的信息，接下来再获取周围邻近基站信息以辅助通过基站定位的精准性
  // 获得邻近基站信息
  List<NeighboringCellInfo> list = tm.getNeighboringCellInfo();
  int size = list.size();
  for (int i = 0; i < size; i++) {
   CellInfo cell = new CellInfo();
   cell.setCellId(list.get(i).getCid());
   cell.setLocationAreaCode(location.getNetworkId());
   cell.setMobileNetworkCode(String.valueOf(location.getSystemId()));
   cell.setMobileCountryCode(tm.getNetworkOperator().substring(0, 3));
   cell.setRadioType("cdma");
   cellInfos.add(cell);
  }
 }
 
 
 /**
  * 移动
  * 
  * @param cellInfos
  * @param tm
  */private static void mobile(ArrayList<CellInfo> cellInfos,
   TelephonyManager tm) {
  GsmCellLocation location = (GsmCellLocation)tm.getCellLocation();  
  CellInfo info = new CellInfo();
  info.setCellId(location.getCid());
  info.setLocationAreaCode(location.getLac());
  info.setMobileNetworkCode(tm.getNetworkOperator().substring(3, 5));
  info.setMobileCountryCode(tm.getNetworkOperator().substring(0, 3));
  info.setRadioType("gsm");
  cellInfos.add(info);
   
  //前面获取到的都是单个基站的信息，接下来再获取周围邻近基站信息以辅助通过基站定位的精准性
  // 获得邻近基站信息
  List<NeighboringCellInfo> list = tm.getNeighboringCellInfo();
  int size = list.size();
  for (int i = 0; i < size; i++) {
   CellInfo cell = new CellInfo();
   cell.setCellId(list.get(i).getCid());
   cell.setLocationAreaCode(location.getLac());
   cell.setMobileNetworkCode(tm.getNetworkOperator().substring(3, 5));
   cell.setMobileCountryCode(tm.getNetworkOperator().substring(0, 3));
   cell.setRadioType("gsm");
   cellInfos.add(cell);
  }
 }
 
 
 /**
  *  联通
  *  
  * @param cellInfos
  * @param tm
  */private static void union(ArrayList<CellInfo> cellInfos, TelephonyManager tm) {
  GsmCellLocation location = (GsmCellLocation)tm.getCellLocation();  
  CellInfo info = new CellInfo();
  //经过测试，获取联通数据以下两行必须去掉，否则会出现错误，错误类型为JSON Parsing Error
  //info.setMobileNetworkCode(tm.getNetworkOperator().substring(3, 5));  
  //info.setMobileCountryCode(tm.getNetworkOperator().substring(0, 3));
  info.setCellId(location.getCid());
  info.setLocationAreaCode(location.getLac());
  info.setMobileNetworkCode("");
  info.setMobileCountryCode("");
  info.setRadioType("gsm");
  cellInfos.add(info);
   
  //前面获取到的都是单个基站的信息，接下来再获取周围邻近基站信息以辅助通过基站定位的精准性
  // 获得邻近基站信息
  List<NeighboringCellInfo> list = tm.getNeighboringCellInfo();
  int size = list.size();
  for (int i = 0; i < size; i++) {
   CellInfo cell = new CellInfo();
   cell.setCellId(list.get(i).getCid());
   cell.setLocationAreaCode(location.getLac());
   cell.setMobileNetworkCode("");
   cell.setMobileCountryCode("");
   cell.setRadioType("gsm");
   cellInfos.add(cell);
  }
 }
 /**
  * 提示
  * 
  * @param ctx
  * @param msg
  */public static void alert(Context ctx,String msg){
  Toast.makeText(ctx, msg, Toast.LENGTH_LONG).show();
 }
  
 /**
  * 发送post请求，返回输入流
  * 
  * @param path 访问路径
  * @param params json数据格式
  * @param encoding 编码
  * @return
  * @throws UnsupportedEncodingException
  * @throws MalformedURLException
  * @throws IOException
  * @throws ProtocolException
  */public static InputStream sendPostRequest(String path, String params, String encoding)
 throws UnsupportedEncodingException, MalformedURLException,
 IOException, ProtocolException {
  byte[] data = params.getBytes(encoding);
  URL url = new URL(path);
  HttpURLConnection conn = (HttpURLConnection)url.openConnection();
  conn.setRequestMethod("POST");
  conn.setDoOutput(true);
  //application/x-javascript text/xml->xml数据 application/x-javascript->json对象 application/x-www-form-urlencoded->表单数据
  conn.setRequestProperty("Content-Type", "application/x-javascript; charset="+ encoding);
  conn.setRequestProperty("Content-Length", String.valueOf(data.length));
  conn.setConnectTimeout(5 * 1000);
  OutputStream outStream = conn.getOutputStream();
  outStream.write(data);
  outStream.flush();
  outStream.close();
  if(conn.getResponseCode()==200)
   return conn.getInputStream();
  return null;
 }
  
 /**
  * 发送get请求
  * 
  * @param path 请求路径
  * @return
  * @throws Exception
  */public static String sendGetRequest(String path) throws Exception {
  URL url = new URL(path);
  HttpURLConnection conn = (HttpURLConnection) url.openConnection();
  conn.setConnectTimeout(5 * 1000);
  conn.setRequestMethod("GET");
  InputStream inStream = conn.getInputStream();
  byte[] data = readInputStream(inStream);
  String result = new String(data, "UTF-8");
  return result;
 }
  
 /**
  * 从输入流中读取数据
  * @param inStream
  * @return
  * @throws Exception
  */public static byte[] readInputStream(InputStream inStream) throws Exception{
  ByteArrayOutputStream outStream = new ByteArrayOutputStream();
  byte[] buffer = new byte[1024];
  int len = 0;
  while( (len = inStream.read(buffer)) !=-1 ){
   outStream.write(buffer, 0, len);
  }
  byte[] data = outStream.toByteArray();//网页的二进制数据
  outStream.close();
  inStream.close();
  return data;
 }
 
  
}

6、main.xml–>布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"><EditText android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:cursorVisible="false"
        android:editable="false"
        android:id="@+id/editText"/></LinearLayout>

7、清单文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.ljq.activity" android:versionCode="1"
 android:versionName="1.0"><application android:icon="@drawable/icon"
  android:label="@string/app_name"><activity android:name=".GpsActivity"
   android:label="@string/app_name"><intent-filter><action android:name="android.intent.action.MAIN" /><category
     android:name="android.intent.category.LAUNCHER" /></intent-filter></activity><service android:label="GPS服务" android:name=".GpsService" /></application><uses-sdk android:minSdkVersion="7" /><uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /><uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /><uses-permission android:name="android.permission.INTERNET" /><uses-permission android:name="android.permission.READ_PHONE_STATE" /><uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
</manifest>

效果如下：