本代码实现GPS定位，并定时在界面上呈现定位的精度以及在用卫星数量。

布局代码如下：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical" >

<TextView

android:id="@+id/showtv"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="GPS经纬度获取服务,每60秒界面更新一次数据，而后台GPS更新服务是每30秒更新一次GPS数据" />

<LinearLayout

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_marginTop="8dp"

android:gravity="center"

android:orientation="horizontal" >

<Button

android:id="@+id/Startbtn"

android:layout_width="96dp"

android:layout_height="48dp"

android:text="@string/startbtn" />

<Button

android:id="@+id/Stopbtn"

android:layout_width="96dp"

android:layout_height="48dp"

android:text="@string/stopbtn" />

</LinearLayout>

<TextView

android:id="@+id/tv"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_marginLeft="4dp"

android:layout_marginTop="10dp"

android:text="@string/defaultshow"

android:textSize="18sp" />

</LinearLayout>

首先写后台的LBSServiceListener 实现LocationListener接口，在这个LBSServiceListener 中可以重写方法，代码如下：

package com.exams.demo10_lbs;

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.os.Bundle;

import android.util.Log;

public class LBSServiceListener implements LocationListener {

public int GPSCurrentStatus;

public Location currentLocation;

public void onLocationChanged(Location location) {

// TODO Auto-generated method stub

//-------

// Called when a new location is found by the location provider.

if (currentLocation != null) {

if (isBetterLocation(location, currentLocation)) {

// Log.v("GPSTEST", "It's a better location");

currentLocation = location;

} else {

// Log.v("GPSTEST", "Not very good!");

}

} else {

// Log.v("GPSTEST", "It's first location");

currentLocation = location;

}

}

// 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

//

}

public void onProviderDisabled(String provider) {

// TODO Auto-generated method stub

// if ((LocationManager.NETWORK_PROVIDER).equals(provider)) {

// locationManager.removeUpdates(this);

// } else if ((LocationManager.GPS_PROVIDER).equals(provider)) {

// locationManager.removeUpdates(this);

// }

}

public void onProviderEnabled(String provider) {

// TODO Auto-generated method stub

}

public void onStatusChanged(String provider, int status, Bundle extras) {

// TODO Auto-generated method stub

GPSCurrentStatus = status;

}

private static final int CHECK_INTERVAL = 1000 * 30;

protected boolean isBetterLocation(Location location,

Location currentBestLocation) {

if (currentBestLocation == null) {

// A new location is always better than no location

return true;

}

// Check whether the new location fix is newer or older

long timeDelta = location.getTime() - currentBestLocation.getTime();

boolean isSignificantlyNewer = timeDelta > CHECK_INTERVAL;

boolean isSignificantlyOlder = timeDelta < -CHECK_INTERVAL;

boolean isNewer = timeDelta > 0;

// If it's been more than two minutes since the current location,

// use the new location

// because the user has likely moved

if (isSignificantlyNewer) {

return true;

// If the new location is more than two minutes older, it must

// be worse

} else if (isSignificantlyOlder) {

return false;

}

// Check whether the new location fix is more or less accurate

int accuracyDelta = (int) (location.getAccuracy() - currentBestLocation

.getAccuracy());

boolean isLessAccurate = accuracyDelta > 0;

boolean isMoreAccurate = accuracyDelta < 0;

boolean isSignificantlyLessAccurate = accuracyDelta > 200;

// Check if the old and new location are from the same provider

boolean isFromSameProvider = isSameProvider(location.getProvider(),

currentBestLocation.getProvider());

// Determine location quality using a combination of timeliness and

// accuracy

if (isMoreAccurate) {

return true;

} else if (isNewer && !isLessAccurate) {

return true;

} else if (isNewer && !isSignificantlyLessAccurate

&& isFromSameProvider) {

return true;

}

return false;

}

/** Checks whether two providers are the same */

private boolean isSameProvider(String provider1, String provider2) {

if (provider1 == null) {

return provider2 == null;

}

return provider1.equals(provider2);

}

}

这样这个LBSServiceListener已经实现，其中我使用isBetterLocation()方法对Location做判断。

下面代码是GpsSatelliteListener 实现GpsStatus.Listener：

package com.exams.demo10_lbs;

import android.location.GpsStatus;

import android.location.GpsStatus.Listener;

public class GpsSatelliteListener implements Listener {

public void onGpsStatusChanged(int event) {

// TODO Auto-generated method stub

switch (event) {

// 第一次定位

case GpsStatus.GPS_EVENT_FIRST_FIX:

break;

// 卫星状态改变

case GpsStatus.GPS_EVENT_SATELLITE_STATUS:

break;

// 定位启动

case GpsStatus.GPS_EVENT_STARTED:

break;

// 定位结束

case GpsStatus.GPS_EVENT_STOPPED:

break;

}

}

}

重点是LBSService 它是继承了Service.

在这个类中，重点通过onStartCommand方法和ACTIVITY沟通，实现将定位的经纬度等信息返回给activity的textview文本呈现出来。

package com.exams.demo10_lbs;

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.Iterator;

import android.app.Notification;

import android.app.NotificationManager;

import android.app.PendingIntent;

import android.app.Service;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.content.IntentFilter;

import android.location.GpsSatellite;

import android.location.GpsStatus;

import android.location.Location;

import android.location.LocationListener;

import android.location.LocationManager;

import android.os.Binder;

import android.os.Bundle;

import android.os.IBinder;

import android.util.Log;

public class LBSService extends Service {

public static final String TAG = "LBSService";

// 30000ms --minimum time interval between location updates, in milliseconds

private static final long minTime = 30000;

// 最小变更距离 10m --minimum distance between location updates, in meters

private static final float minDistance = 10;

String tag = this.toString();

private LocationManager locationManager;

private LocationListener locationListener;

private Location location;

private GpsStatus gStatus;

private GpsSatelliteListener gpsSatelliteListener;

private final IBinder mBinder = new LBSServiceBinder();

private NotificationManager mNM;

boolean flag;

CommandReceiver cmdReceiver;

@Override

public void onCreate() {

// TODO Auto-generated method stub

flag = true;

cmdReceiver = new CommandReceiver();

super.onCreate();

mNM = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

showNotification();

startService();

Log.i(TAG, "in onCreate method.");

}

@Override

public void onDestroy() {

// TODO Auto-generated method stub

this.unregisterReceiver(cmdReceiver);// 取消注册的CommandReceiver

super.onDestroy();

stopService();

mNM.cancel(R.string.lbsservice);

Log.i(TAG, "in onDestroy method.");

}

@Override

public IBinder onBind(Intent intent) {

// TODO Auto-generated method stub

return mBinder;

}

@Override

public int onStartCommand(Intent intent, int flags, int startId) {

// TODO Auto-generated method stub

IntentFilter filter = new IntentFilter();// 创建IntentFilter对象

filter.addAction("com.exams.demo10_lbs.LBSService");

registerReceiver(cmdReceiver, filter);// 注册Broadcast

// Receiver,后续会接收相关广播intent

doJob();// 调用方法启动线程

return super.onStartCommand(intent, flags, startId);

}

public class LBSServiceBinder extends Binder {

LBSService getService() {

return LBSService.this;

}

}

public void startService() {

locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

locationListener = new LBSServiceListener();

locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,

minTime, minDistance, locationListener);

gpsSatelliteListener = new GpsSatelliteListener();

locationManager.addGpsStatusListener(gpsSatelliteListener);

Log.i(TAG, "in startService method.");

}

public void stopService() {

if (locationManager != null && locationListener != null

&& gpsSatelliteListener != null) {

locationManager.removeUpdates(locationListener);

locationManager.removeGpsStatusListener(gpsSatelliteListener);

}

Log.i(TAG, "in stopService method.");

}

private class CommandReceiver extends BroadcastReceiver {

@Override

public void onReceive(Context context, Intent intent) {

// TODO Auto-generated method stub

int cmd = intent.getIntExtra("cmd", -1);// 获取Extra信息

if (cmd == MainActivity.CMD_STOP_SERVICE) {// 如果发来的消息是停止服务

flag = false;// 停止线程

stopSelf();// 停止服务

}

}// 继承自BroadcastReceiver的子类

}

/** * Show a notification while this service is running. */

@SuppressWarnings("deprecation")

private void showNotification() {

// In this sample, we'll use the same text

// for the ticker and the expanded

// notification

CharSequence text = getText(R.string.lbsservice);

// Set the icon, scrolling text and timestamp

Notification notification = new Notification(R.drawable.ic_launcher,

text, System.currentTimeMillis());

// The PendingIntent to launch our activity if the user selects this

Intent intent = new Intent(this, MainActivity.class);

// notification

PendingIntent contentIntent = PendingIntent.getActivity(this, 0,

intent, 0);

// Set the info for the views that show in the notification panel.

notification.setLatestEventInfo(this, "LBSService",

"LBS Service started", contentIntent);

// Send the notification.

// We use a layout id because it is a unique number. We use it later to

// cancel.

mNM.notify(R.string.lbsservice, notification);

}

// 方法：

public void doJob() {

new Thread() {

public void run() {

while (flag) {

try {// 睡眠一段时间

Thread.sleep(60000);

} catch (Exception e) {

e.printStackTrace();

}

Intent intent = new Intent();// 创建Intent对象

intent.setAction("com.exams.demo10_lbs");

location = locationManager

.getLastKnownLocation(LocationManager.GPS_PROVIDER);

gStatus = locationManager.getGpsStatus(null);

// 获取默认最大卫星数

int maxSatellites = gStatus.getMaxSatellites();

Iterable<GpsSatellite> iterable = gStatus.getSatellites();

Iterator<GpsSatellite> iterator = iterable.iterator();

int x = 0;

while (iterator != null && iterator.hasNext()

&& x <= maxSatellites) {

GpsSatellite gpsSatellite = (GpsSatellite) iterator

.next();

if (gpsSatellite.usedInFix())

x++;

}

String latitude, longitude, accuracy, speed;

if (location != null) {

latitude = location.getLatitude() + "";

longitude = location.getLongitude() + "";

accuracy = location.getAccuracy() + "";

speed = location.getSpeed() + "";

} else {

latitude = "0.0";

longitude = "0.0";

accuracy = "未知 ";

speed = "0.0";

}

Bundle bundle = new Bundle();

bundle.putString("latitude", latitude);

bundle.putString("longitude", longitude);

bundle.putString("accuracy", accuracy + "m");

bundle.putString("speed", speed + "m/s");

bundle.putString("Satenum", x + "个");

SimpleDateFormat sDateFormat=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

Date nowDate=new Date();

String dateString=sDateFormat.format(nowDate);

bundle.putString("date", dateString+ "");

intent.putExtras(bundle);

sendBroadcast(intent);// 发送广播

}

}

}.start();

}

}

最后是Activity部分：

package com.exams.demo10_lbs;

import android.app.Activity;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.content.IntentFilter;

import android.location.LocationManager;

import android.os.Bundle;

import android.provider.Settings;

import android.util.Log;

import android.view.Menu;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;

import android.widget.Toast;

public class MainActivity extends Activity {

public static final int CMD_STOP_SERVICE = 0;

public static final String TAG = "MainActivity";

public Button startbtnButton, stopButton;

public TextView tView;

DataReceiver dataReceiver;// BroadcastReceiver对象

public LocationManager lManager;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

startbtnButton = (Button) findViewById(R.id.Startbtn);

stopButton = (Button) findViewById(R.id.Stopbtn);

tView = (TextView) findViewById(R.id.tv);

lManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

// 判断GPS是否正常启动

if (!lManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {

Toast.makeText(this, "请开启GPS导航...", Toast.LENGTH_SHORT).show();

// 返回开启GPS导航设置界面

Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);

startActivityForResult(intent, 0);

return;

}

startbtnButton.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {

// TODO Auto-generated method stub

startService();

}

});

stopButton.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {

// TODO Auto-generated method stub

stopService();

}

});

}

private void startService() {

startbtnButton.setEnabled(false);

stopButton.setEnabled(true);

Intent i = new Intent(this, LBSService.class);

this.startService(i);

Log.i(TAG, "in startService method.");

if (dataReceiver == null) {

dataReceiver = new DataReceiver();

IntentFilter filter = new IntentFilter();// 创建IntentFilter对象

filter.addAction("com.exams.demo10_lbs");

registerReceiver(dataReceiver, filter);// 注册Broadcast Receiver

}

}

private void stopService() {

startbtnButton.setEnabled(true);

stopButton.setEnabled(false);

Intent i = new Intent(this, LBSService.class);

this.stopService(i);

Log.i(TAG, "in stopService method.");

if (dataReceiver != null) {

unregisterReceiver(dataReceiver);// 取消注册Broadcast Receiver

dataReceiver = null;

}

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

getMenuInflater().inflate(R.menu.activity_main, menu);

return true;

}

private class DataReceiver extends BroadcastReceiver {// 继承自BroadcastReceiver的子类

@Override

public void onReceive(Context context, Intent intent) {// 重写onReceive方法

Bundle bundledata = intent.getExtras();

if (bundledata != null) {

String latitude = bundledata.getString("latitude");

String longitude = bundledata.getString("longitude");

String accuracy = bundledata.getString("accuracy");

String speed=bundledata.getString("speed");

String Satenum = bundledata.getString("Satenum");

String dateString = bundledata.getString("date");

tView.setText("\t卫星在用数量:" + Satenum + "\n\t纬度:" + latitude

+ "\t经度:" + longitude + "\n\t精度:" + accuracy

+"\n\t速度:"+speed+ "\n\t更新时间:" + dateString);

}

}

}

@Override

protected void onStart() {

// TODO Auto-generated method stub

super.onStart();

}

@Override

protected void onStop() {

// TODO Auto-generated method stub

super.onStop();

}

}

其中AndroidManifest.xml文件内容如下：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.exams.demo10_lbs"

android:versionCode="1"

android:versionName="1.0" >

<uses-sdk

android:minSdkVersion="8"

android:targetSdkVersion="15" />

<uses-permission android:name="android.permission.INTERNET" />

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

<application

android:icon="@drawable/ic_launcher"

android:label="@string/app_name"

android:theme="@style/AppTheme" >

<activity

android:name=".MainActivity"

android:label="@string/title_activity_main" >

<intent-filter>

<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />

</intent-filter>

</activity>

<service

android:name=".LBSService"

android:process=":remote" >

<intent-filter>

<action android:name="com.exams.demo10_lbs.LBSService" />

</intent-filter>

</service>

</application>

</manifest>

这个是根据网上学习相关service及activity等写的，有不足的地方，希望大家指正。代码有点乱，有些欠考虑的地方，还在完善中。现在共享出来，期望一起学习~~~

执行步骤，启动后，点击“启动”按钮，后台会启动一个service服务，然后一分钟的时间，会在界面上呈现出最后一次定位的GPS等信息。界面很简单。不多说了，上图。

对了，真机才能定位成功。