Dr. Ramkumar Lakshminarayanan article published in Tamil Computer Magazine. The content is about creating GPS-Android Application

1. THâv (GPS)ªî£N™¸†ð‹
Íô‹  ⃰ àœ«÷£‹
â¡ð¬î ÜP‰¶ ªè£œ÷
º®»‹. THâv â¡ð¶
°«÷£ð™ ªð£CêQƒ Cv
ì‹ (GPS-Global Positioning
System) Ý°‹. THâv ê£îùƒ
èœ îèõ™è¬÷ àôªèƒA½‹
àœ÷ 24 ªêòŸ¬è «è£œèO™ Þ¼‰¶ â‰î
G¬ôJ™ àœ«÷£‹ â¡ðî¬ù è‡ìPAø¶.
Þ¡¬øò ªð¼‹ð£ô£ù ªê™«ðCèœ THâv
õêF¬ò ªè£‡«ì à¼õ£‚èŠð´A¡øù.
THâv ªêòŸ¬è«è£œèœ àôèˆF¬ù
å¼ ï£¬÷‚° Þó‡´ º¬ø ²ŸP îèõ™è¬÷
ªðÁA¡øù. ܪñK‚è ð£¶è£Š¹ ¶¬ø (Us
Department of Defense) THâvC¬ù ðò¡
ð´ˆF õ‰î¶. 1980 ºî™ ܬùõ¼‹ ðò¡
ð´ˆî ܪñK‚è ð£¶è£Š¹ ¶¬ø ♫ô£¼‚
°‹ ÜÂñF õöƒAò¶.
THâv ê£îùˆFŸ° Üèô‚«è£´ (Latitude)
GôG¬ó‚«è£´ (Longitude) 꺈Fó ñ†ìˆF
L¼‰¶ îèõ™è¬÷ ÜPò º®»‹. ðœ
«ñŠv «ð£¡ø ªñ¡ªð£¼œèœ Þ‰î îèõ™
è¬÷ ªè£‡«ì  ⃰ Þ¼‚A«ø£‹
â¡ðî¬ù è‡ìPò ðò¡ð´A¡øù.
݇†ó£Œ®™ THâv
THâvC¬ù Ü®Šð¬ìò£è à¼õ£‚èŠ
ð´‹ ÜŠO«èê¡èÀ‚° ⺫ô†ìK¬ù
(Emulator) ðò¡ð´ˆî º®»‹. THâv ðò¡
𴈶‹ ÜŠO«èê¡èO¡ Androidmani fest.
xml-L™ ÜÂñF õöƒè «õ‡´‹.
Üî¬ìò ðò¡ð£´
<uses-permission android:name=
"android.permission
ACCESS-FINE-LOCATION">
<uses-permission>
å¼ ÞìˆF¬ù ÜPõ ݇†ó£Œ´
ÜŠO«èêQ™ Location Listener-J¬ù ªô£‚
«èû¡ «ñ«ùü˜ A÷£v àì¡ ðò¡ð´ˆî
«õ‡´‹.
Gó™-1
Gó™-2
ðì‹-2
ðì‹-1

2. Ý¡†ó£Œ´ -2
Þ󣋰ñ£˜ ªô†²Iï£ó£òí¡
12
LocationManager mlocManager=
(LocationManager)getSystemService(
Context.LOCATION-SERVICE)
LocationListener mlocListerner=
nero MyLocationListerner();
mloc Manager.request Location Updates
(Location Manager.GPS-PROVIDER,0,0
mlocListerner)
OnLocationChanged(Location Update) â¡ø
ªñˆî´  Þ¼‚°‹ ÞìˆF¬ù F¬óJ™
裇H‚°‹.
¹Fò ¹ó£ªü‚† å¡P¬ù THâv âù
ªî£ìƒ°«õ£‹. main.xml -L™ àœ÷¶
«ð£¡Á Þ¼‚°‹. Ü´ˆîî£è Androidmani
fest.xml ç¬ðL™ ÜÂñF (Permission)
ªè£´‚è «õ‡ ´‹. Androidmanifest.xml -¡
Gó™ 2-™ àœ÷¶ «ð£¡Á Þ¼‚°‹.
ÜŠO«èê¡ ªî£ìƒAò¾ì¡ ®¬õC™
àœ÷ THâvC¬ù F¬óJ™ 裇H‚°‹.
⺫ô†ì¼‚° (Emulator) latitude, Longitude
package com.ram.gps;
import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.Toast;
public class GpsActivity extends Activity {
/** Called when the activity is first
created. */
@Override
public void onCreate(Bundle
savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
/* Use the LocationManager class to
obtain GPS locations */
LocationManager mlocManager =
(LocationManager)getSystemService(Context.
LOCATION_SERVICE);
LocationListener mlocListener = new
MyLocationListener();
mlocManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER, 0, 0,
mlocListener);
}
public class MyLocationListener
implements LocationListener
{
@Override
public void onLocationChanged(Location
loc)
{
loc.getLatitude();
loc.getLongitude();
String Text = "My current location is: " +
"Latitud = " + loc.getLatitude() +
"Longitud = " + loc.getLongitude();
Toast.makeText(
getApplicationContext(),Text,
Toast.LENGTH_SHORT).show();
}
@Override
public void onProviderDisabled(String
provider)
{
Toast.makeText( getApplicationContext(),
"Gps Disabled",
Toast.LENGTH_SHORT ).show();
}
@Override
public void onProviderEnabled(String
provider)
{
Toast.makeText( getApplicationContext(),
"Gps Enabled",
Toast.LENGTH_SHORT).show();
}
@Override
public void onStatusChanged(String
provider, int status, Bundle extras)
{
}
}/* End of Class MyLocationListener */
}
ðì‹-3
Gó™-3

3. - ªî£ì¼‹
Altitude ÝAòõŸ¬ø
ªì™ªï†(Telnet)ðò¡
ð´ˆF ªè£´‚è º®
»‹. ꣡ø£è ⺫ô†
ì˜ 5554 â¡ø «ð£˜
®™ ªêò™ð†ì£™
èñ£‡† Šó£‹Š†
®™ W›‚è‡ìõ£Á
è†ì¬÷ ªè£´‚è
«õ‡´‹.
talent localhost 5554
geo fix 2030 500 â¡Á ªè£´ˆî£™, Üèô
«è£†®¡ à¬ìò ñFŠ¹ 20 â¡Á‹ Gô
G¬ó‚«è£†®Â¬ìò ñFŠ¹ 30 â¡Á‹
àòóˆF¬ìò (Altitute) ñFŠ¹ 500 â¡Á‹
ܬñˆ¶‚ ªè£œÀ‹. (ðì‹-1)
Location Changed â¡ø ªñˆî®™ ⺫ô†
ì˜ Ü™ô¶ ªñ£¬ð™ ®¬õC™ àœ÷ îŸ
«ð£¬îò Üèô‚«è£´ ñŸÁ‹ GôG¬ó‚
«è£†®¬ù è‡ìPò º®»‹. ÜîŸè£è
loc.getLatitude();
loc.getLongitude(); ðò¡ð´ˆîŠð´Aø¶
THâv Ý‚®M†®‚è£ù
Gó™ -3 ™ àœ÷¶.
Run>Run As> Android Appli
cation â¡ðî¬ù AO‚ ªêŒî¾
ì¡ ÜŠO«èê¡ ªêò™ðì
ªî£ìƒ°‹. ªì™ªï† Íô‹
THâvCŸè£ù îèõL¬ù
ªè£´ˆî£™ Üî¬ù F¬óJ™
裇H‚°‹.
â‚OŠC™ Þ¼‰¶‹ îèõ™
ªè£´‚è º®»‹. â‚OŠC™
®®â‹âv â¡ðî¬ù «î˜¾ ªêŒ¶
ªè£´‚è «õ‡´‹. (ðì‹-3)
Þ‰î ꣡Á Íô‹ THâv ®¬õC™
àœ÷ Üèô‚«è£´ ñŸÁ‹ GôG¬ó‚«è£´
âšõ£Á 致H®Šð¶ â¡ðî¬ù 𣘈
«î£‹.