本代码实现GPS定位

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：

<LinearLayoutxmlns:android="/apk/res/android"

xmlns:tools="/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：

packagecom.exams.demo10_lbs;

importjava.text.DateFormat;

importjava.text.SimpleDateFormat;

importjava.util.Calendar;

importjava.util.GregorianCalendar;

importjava.util.TimeZone;

importandroid.location.Location;

importandroid.location.LocationListener;

importandroid.os.Bundle;

importandroid.util.Log;

publicclassLBSServiceListenerimplementsLocationListener{

publicintGPSCurrentStatus;

publicLocationcurrentLocation;

publicvoidonLocationChanged(Locationlocation){

//TODOAuto-generatedmethodstub

//-------

//Calledwhenanewlocationisfoundbythelocationprovider.

if(currentLocation!=null){

if(isBetterLocation(location,currentLocation)){

//Log.v("GPSTEST","It'sabetterlocation");

currentLocation=location;

}else{

//Log.v("GPSTEST","Notverygood!");

}

}else{

//Log.v("GPSTEST","It'sfirstlocation");

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

privatevoiddoGet(Stringstring){

//TODOAuto-generatedmethodstub

//

}

publicvoidonProviderDisabled(Stringprovider){

//TODOAuto-generatedmethodstub

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

//locationManager.removeUpdates(this);

//}elseif((LocationManager.GPS_PROVIDER).equals(provider)){

//locationManager.removeUpdates(this);

//}

}

publicvoidonProviderEnabled(Stringprovider){

//TODOAuto-generatedmethodstub

}

publicvoidonStatusChanged(Stringprovider,intstatus,Bundleextras){

//TODOAuto-generatedmethodstub

GPSCurrentStatus=status;

}

privatestaticfinalintCHECK_INTERVAL=1000*30;

protectedbooleanisBetterLocation(Locationlocation,

LocationcurrentBestLocation){

if(currentBestLocation==null){

//Anewlocationisalwaysbetterthannolocation

returntrue;

}

//Checkwhetherthenewlocationfixisnewerorolder

longtimeDelta=location.getTime()-currentBestLocation.getTime();

booleanisSignificantlyNewer=timeDelta>CHECK_INTERVAL;

booleanisSignificantlyOlder=timeDelta<-CHECK_INTERVAL;

booleanisNewer=timeDelta>0;

//Ifit'sbeenmorethantwominutessincethecurrentlocation,

//usethenewlocation

//becausetheuserhaslikelymoved

if(isSignificantlyNewer){

returntrue;

//Ifthenewlocationismorethantwominutesolder,itmust

//beworse

}elseif(isSignificantlyOlder){

returnfalse;

}

//Checkwhetherthenewlocationfixismoreorlessaccurate

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

.getAccuracy());

booleanisLessAccurate=accuracyDelta>0;

booleanisMoreAccurate=accuracyDelta<0;

booleanisSignificantlyLessAccurate=accuracyDelta>200;

//Checkiftheoldandnewlocationarefromthesameprovider

booleanisFromSameProvider=isSameProvider(location.getProvider(),

currentBestLocation.getProvider());

//Determinelocationqualityusingacombinationoftimelinessand

//accuracy

if(isMoreAccurate){

returntrue;

}elseif(isNewer&&!isLessAccurate){

returntrue;

}elseif(isNewer&&!isSignificantlyLessAccurate

&&isFromSameProvider){

returntrue;

}

returnfalse;

}

/**Checkswhethertwoprovidersarethesame*/

privatebooleanisSameProvider(Stringprovider1,Stringprovider2){

if(provider1==null){

returnprovider2==null;

}

returnprovider1.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：

packagecom.exams.demo10_lbs;

importandroid.location.GpsStatus;

importandroid.location.GpsStatus.Listener;

publicclassGpsSatelliteListenerimplementsListener{

publicvoidonGpsStatusChanged(intevent){

//TODOAuto-generatedmethodstub

switch(event){

//第一次定位

caseGpsStatus.GPS_EVENT_FIRST_FIX:

break;

//卫星状态改变

caseGpsStatus.GPS_EVENT_SATELLITE_STATUS:

break;

//定位启动

caseGpsStatus.GPS_EVENT_STARTED:

break;

//定位结束

caseGpsStatus.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。

packagecom.exams.demo10_lbs;

importjava.text.SimpleDateFormat;

importjava.util.Date;

importjava.util.Iterator;

importandroid.app.Notification;

importandroid.app.NotificationManager;

importandroid.app.PendingIntent;

importandroid.app.Service;

importandroid.content.BroadcastReceiver;

importandroid.content.Context;

importandroid.content.Intent;

importandroid.content.IntentFilter;

importandroid.location.GpsSatellite;

importandroid.location.GpsStatus;

importandroid.location.Location;

importandroid.location.LocationListener;

importandroid.location.LocationManager;

importandroid.os.Binder;

importandroid.os.Bundle;

importandroid.os.IBinder;

importandroid.util.Log;

publicclassLBSServiceextendsService{

publicstaticfinalStringTAG="LBSService";

//30000ms--minimumtimeintervalbetweenlocationupdates,inmilliseconds

privatestaticfinallongminTime=30000;

//最小变更距离10m--minimumdistancebetweenlocationupdates,inmeters

privatestaticfinalfloatminDistance=10;

Stringtag=this.toString();

privateLocationManagerlocationManager;

privateLocationListenerlocationListener;

privateLocationlocation;

privateGpsStatusgStatus;

privateGpsSatelliteListenergpsSatelliteListener;

privatefinalIBindermBinder=newLBSServiceBinder();

privateNotificationManagermNM;

booleanflag;

CommandReceivercmdReceiver;

@Override

publicvoidonCreate(){

//TODOAuto-generatedmethodstub

flag=true;

cmdReceiver=newCommandReceiver();

super.onCreate();

mNM=(NotificationManager)getSystemService(NOTIFICATION_SERVICE);

showNotification();

startService();

Log.i(TAG,"inonCreatemethod.");

}

@Override

publicvoidonDestroy(){

//TODOAuto-generatedmethodstub

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

super.onDestroy();

stopService();

mNM.cancel(R.string.lbsservice);

Log.i(TAG,"inonDestroymethod.");

}

@Override

publicIBinderonBind(Intentintent){

//TODOAuto-generatedmethodstub

returnmBinder;

}

@Override

publicintonStartCommand(Intentintent,intflags,intstartId){

//TODOAuto-generatedmethodstub

IntentFilterfilter=newIntentFilter();//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

returnsuper.onStartCommand(intent,flags,startId);

}

publicclassLBSServiceBinderextendsBinder{

LBSServicegetService(){

returnLBSService.this;

}

}

publicvoidstartService(){

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

locationListener=newLBSServiceListener();

locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,

minTime,minDistance,locationListener);

gpsSatelliteListener=newGpsSatelliteListener();

locationManager.addGpsStatusListener(gpsSatelliteListener);

Log.i(TAG,"instartServicemethod.");

}

publicvoidstopService(){

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

&&gpsSatelliteListener!=null){

locationManager.removeUpdates(locationListener);

locationManager.removeGpsStatusListener(gpsSatelliteListener);

}

Log.i(TAG,"instopServicemethod.");

}

privateclassCommandReceiverextendsBroadcastReceiver{

@Override

publicvoidonReceive(Contextcontext,Intentintent){

//TODOAuto-generatedmethodstub

intcmd=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

}

/***Showanotificationwhilethisserviceisrunning.*/

@SuppressWarnings("deprecation")

privatevoidshowNotification(){

//Inthissample,we'llusethesametext

//forthetickerandtheexpanded

//notification

CharSequencetext=getText(R.string.lbsservice);

//Settheicon,scrollingtextandtimestamp

Notificationnotification=newNotification(R.drawable.ic_launcher,

text,System.currentTimeMillis());

//ThePendingIntenttolaunchouractivityiftheuserselectsthis

Intentintent=newIntent(this,MainActivity.class);

//notification

PendingIntentcontentIntent=PendingIntent.getActivity(this,0,

intent,0);

//Settheinfofortheviewsthatshowinthenotificationpanel.

notification.setLatestEventInfo(this,"LBSService",

"LBSServicestarted",contentIntent);

//Sendthenotification.

//Weusealayoutidbecauseitisauniquenumber.Weuseitlaterto

//cancel.

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

}

//方法：

publicvoiddoJob(){

newThread(){

publicvoidrun(){

while(flag){

try{//睡眠一段时间

Thread.sleep(60000);

}catch(Exceptione){

e.printStackTrace();

}

Intentintent=newIntent();//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

intmaxSatellites=gStatus.getMaxSatellites();

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

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

intx=0;

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

&&x<=maxSatellites){

GpsSatellitegpsSatellite=(GpsSatellite)iterator

.next();

if(gpsSatellite.usedInFix())

x++;

}

Stringlatitude,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";

}

Bundlebundle=newBundle();

bundle.putString("latitude",latitude);

bundle.putString("longitude",longitude);

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

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

bundle.putString("Satenum",x+"个");

SimpleDateFormatsDateFormat=newSimpleDateFormat("yyyy-MM-ddHH:mm:ss");

DatenowDate=newDate();

StringdateString=sDateFormat.format(nowDate);

bundle.putString("date",

dateString+"");

intent.putExtras(bundle);

sendBroadcast(intent);//发送广播

}

}

}.start();

}

}

最后是Activity部分：

packagecom.exams.demo10_lbs;

importandroid.app.Activity;

importandroid.content.BroadcastReceiver;

importandroid.content.Context;

importandroid.content.Intent;

importandroid.content.IntentFilter;

importandroid.location.LocationManager;

importandroid.os.Bundle;

importvider.Settings;

importandroid.util.Log;

importandroid.view.Menu;

importandroid.view.View;

importandroid.widget.Button;

importandroid.widget.TextView;

importandroid.widget.Toast;

publicclassMainActivityextendsActivity{

publicstaticfinalintCMD_STOP_SERVICE=0;

publicstaticfinalStringTAG="MainActivity";

publicButtonstartbtnButton,stopButton;

publicTextViewtView;

DataReceiverdataReceiver;//BroadcastReceiver对象

publicLocationManagerlManager;

@Override

publicvoidonCreate(BundlesavedInstanceState){

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

Intentintent=newIntent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);

startActivityForResult(intent,0);

return;

}

startbtnButton.setOnClickListener(newView.OnClickListener(){

publicvoidonClick(Viewv){

//TODOAuto-generatedmethodstub

startService();

}

});

stopButton.setOnClickListener(newView.OnClickListener(){

publicvoidonClick(Viewv){

//TODOAuto-generatedmethodstub

stopService();

}

});

}

privatevoidstartService(){

startbtnButton.setEnabled(false);

stopButton.setEnabled(true);

Intenti=newIntent(this,LBSService.class);

this.startService(i);

Log.i(TAG,"instartServicemethod.");

if(dataReceiver==null){

dataReceiver=newDataReceiver();

IntentFilterfilter=newIntentFilter();//创建IntentFilter对象

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

registerReceiver(dataReceiver,filter);//注册BroadcastReceiver

}

}

privatevoidstopService(){

startbtnButton.setEnabled(true);

stopButton.setEnabled(false);

Intenti=newIntent(this,LBSService.class);

this.stopService(i);

Log.i(TAG,"instopServicemethod.");

if(dataReceiver!=null){

unregisterReceiver(dataReceiver);//取消注册BroadcastReceiver

dataReceiver=null;

}

}

@Override

publicbooleanonCreateOptionsMenu(Menumenu){

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

returntrue;

}

privateclassDataReceiverextendsBroadcastReceiver{//继承自BroadcastReceiver的子类

@Override

publicvoidonReceive(Contextcontext,Intentintent){//重写onReceive方法

Bundlebundledata=intent.getExtras();

if(bundledata!=null){

Stringlatitude=bundledata.getString("latitude");

Stringlongitude=bundledata.getString("longitude");

Stringaccuracy=bundledata.getString("accuracy");

Stringspeed=bundledata.getString("speed");

StringSatenum=bundledata.getSt