本代码实现GPS定位

2024年6月3日发(作者：)

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：

xmlns:tools="/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical" >

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" />

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_marginTop="8dp"

android:gravity="center"

android:orientation="horizontal" >

android:id="@+id/Startbtn"

android:layout_width="96dp"

android:layout_height="48dp"

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

android:id="@+id/Stopbtn"

android:layout_width="96dp"

android:layout_height="48dp"

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

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" />

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 10_lbs;

import rmat;

import DateFormat;

import ar;

import ianCalendar;

import ne;

import on;

import onListener;

import ;

import ;

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 ((K_PROVIDER).equals(provider)) {

// Updates(this);

// } else if ((_PROVIDER).equals(provider)) {

// Updates(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 = e() - e();

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) (uracy() - 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(vider(),

vider());

// 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 (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er：

package 10_lbs;

import tus;

import er;

public class GpsSatelliteListener implements Listener {

public void onGpsStatusChanged(int event) {

// TODO Auto-generated method stub

switch (event) {

// 第一次定位

case _EVENT_FIRST_FIX:

break;

// 卫星状态改变

case _EVENT_SATELLITE_STATUS:

break;

// 定位启动

case _EVENT_STARTED:

break;

// 定位结束

case _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 10_lbs;

import DateFormat;

import ;

import or;

import cation;

import cationManager;

import gIntent;

import e;

import astReceiver;

import t;

import ;

import Filter;

import ellite;

import tus;

import on;

import onListener;

import onManager;

import ;

import ;

import r;

import ;

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 = ng();

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();

te();

mNM = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

showNotification();

startService();

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

}

@Override

public void onDestroy() {

// TODO Auto-generated method stub

sterReceiver(cmdReceiver);// 取消注册的CommandReceiver

roy();

stopService();

(vice);

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

ion("10_vice");

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 tCommand(intent, flags, startId);

}

public class LBSServiceBinder extends Binder {

LBSService getService() {

return ;

}

}

public void startService() {

locationManager = (LocationManager) getSystemService(ON_SERVICE);

locationListener = new LBSServiceListener();

tLocationUpdates(_PROVIDER,

minTime, minDistance, locationListener);

gpsSatelliteListener = new GpsSatelliteListener();

StatusListener(gpsSatelliteListener);

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

}

public void stopService() {

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

&& gpsSatelliteListener != null) {

Updates(locationListener);

GpsStatusListener(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 = Extra("cmd", -1);// 获取Extra信息

if (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(vice);

// Set the icon, scrolling text and timestamp

Notification notification = new Notification(_launcher,

text, tTimeMillis());

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

Intent intent = new Intent(this, );

// notification

PendingIntent contentIntent = ivity(this, 0,

intent, 0);

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

estEventInfo(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.

(vice, notification);

}

// 方法：

public void doJob() {

new Thread() {

public void run() {

while (flag) {

try {// 睡眠一段时间

(60000);

} catch (Exception e) {

tackTrace();

}

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

ion("10_lbs");

location = locationManager

.getLastKnownLocation(_PROVIDER);

gStatus = Status(null);

// 获取默认最大卫星数

int maxSatellites = Satellites();

Iterable iterable = ellites();

Iterator iterator = or();

int x = 0;

while (iterator != null && t()

&& x <= maxSatellites) {

GpsSatellite gpsSatellite = (GpsSatellite) iterator

.next();

if (Fix())

x++;

}

String latitude, longitude, accuracy, speed;

if (location != null) {

latitude = itude() + "";

longitude = gitude() + "";

accuracy = uracy() + "";

speed = ed() + "";

} else {

latitude = "0.0";

longitude = "0.0";

accuracy = "未知 ";

speed = "0.0";

}

Bundle bundle = new Bundle();

ing("latitude", latitude);

ing("longitude", longitude);

ing("accuracy", accuracy + "m");

ing("speed", speed + "m/s");

ing("Satenum", x + "个");

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

Date nowDate=new Date();

String dateString=(nowDate);

ing("date", dateString+ "");

ras(bundle);

sendBroadcast(intent);// 发送广播

}

}

}.start();

}

}

最后是Activity部分：

package 10_lbs;

import ty;

import astReceiver;

import t;

import ;

import Filter;

import onManager;

import ;

import gs;

import ;

import ;

import ;

import ;

import ew;

import ;

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) {

te(savedInstanceState);

setContentView(ty_main);

startbtnButton = (Button) findViewById(tn);

stopButton = (Button) findViewById(n);

tView = (TextView) findViewById();

lManager = (LocationManager) getSystemService(ON_SERVICE);

// 判断GPS是否正常启动

if (!iderEnabled(_PROVIDER)) {

xt(this, "请开启GPS导航...", _SHORT).show();

// 返回开启GPS导航设置界面

Intent intent = new Intent(_LOCATION_SOURCE_SETTINGS);

startActivityForResult(intent, 0);

return;

}

lickListener(new kListener() {

public void onClick(View v) {

// TODO Auto-generated method stub

startService();

}

});

lickListener(new kListener() {

public void onClick(View v) {

// TODO Auto-generated method stub

stopService();

}

});

}

private void startService() {

bled(false);

bled(true);

Intent i = new Intent(this, );

ervice(i);

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

if (dataReceiver == null) {

dataReceiver = new DataReceiver();

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

ion("10_lbs");

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

}

}

private void stopService() {

bled(true);

bled(false);

Intent i = new Intent(this, );

rvice(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(ty_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 = ras();

if (bundledata != null) {

String latitude = ing("latitude");

String longitude = ing("longitude");

String accuracy = ing("accuracy");

String speed=ing("speed");

String Satenum = ing("Satenum");

String dateString = ing("date");

t("t卫星在用数量:" + Satenum + "nt纬度:" + latitude

+ "t经度:" + longitude + "nt精度:" + accuracy

+"nt速度:"+speed+ "nt更新时间:" + dateString);

}

}

}

@Override

protected void onStart() {

// TODO Auto-generated method stub

t();

}

@Override

protected void onStop() {

// TODO Auto-generated method stub

();

}

}

其中文件内容如下：

package="10_lbs"

android:versionCode="1"

android:versionName="1.0" >

android:minSdkVersion="8"

android:targetSdkVersion="15" />

android:icon="@drawable/ic_launcher"

android:label="@string/app_name"

android:theme="@style/AppTheme" >

android:name=".MainActivity"

android:label="@string/title_activity_main" >

android:name=".LBSService"

android:process=":remote" >