Android GPS Development

Androidmanifest. xml

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

Main. Java

Package com. mrsoft. mrgps. App. Mr;

Import Android. App. activity;
Import Android. App. activitymanager;
Import Android. App. alertdialog;
Import Android. App. alertdialog. Builder;
Import Android. content. context;
Import Android. content. dialoginterface;
Import Android. content. dialoginterface. onclicklistener;
Import Android. Location. criteria;
Import Android. Location. location;
Import Android. Location. locationlistener;
Import Android. Location. locationmanager;
Import Android. OS. Bundle;
Import Android. View. keyevent;
Import Android. View. Menu;
Import Android. View. menuitem;
Import Android. widget. textview;
Import Android. widget. Toast;

Public class main extends activity {
Private textview TV;
Private locationmanager lm;
Private criteria;
Private location;
Private Final Static int menu_about = menu. first;
Private Final Static int menu_exit = menu. First + 1;
/** Called when the activity is first created .*/
@ Override
Public void oncreate (bundle savedinstancestate ){
Super. oncreate (savedinstancestate );
Setcontentview (R. layout. Main );

TV = (textview) findviewbyid (R. Id. TV );

Lm = (locationmanager) getsystemservice (context. location_service );

If (! Lm. isproviderenabled (Android. Location. locationmanager. gps_provider ))
{
Toast. maketext (this, "GPS is disabled. Please enable GPS manually and try again! ", Toast. length_short). Show ();
Return;
}
Else
{
Toast. maketext (this, "GPS positioning...", Toast. length_short). Show ();
}

Criteria = new criteria ();
Criteria. setaccuracy (criteria. accuracy_fine); // sets the accuracy.
Criteria. setaltituderequired (true); // you can specify the request altitude.
Criteria. setbearingrequired (true); // you can specify the request direction.
Criteria. setcostallowed (true); // set to allow carrier fees
Criteria. setpowerrequirement (criteria. power_low); // Low Power Consumption
        
String provider = LM. getbestprovider (criteria, true );
Location = LM. getlastknownlocation (provider );
Newlocalgps (location );
// Listen for the location change once every 1 second
Lm. requestlocationupdates (provider, 1*1000, 0, new locationlistener ());
}

Class locationlistener implements locationlistener
{

@ Override
Public void onlocationchanged (location ){
// Todo auto-generated method stub
Newlocalgps (location );
}

@ Override
Public void onproviderdisabled (string provider ){
// Todo auto-generated method stub
Newlocalgps (null );
}

@ Override
Public void onproviderenabled (string provider ){
// Todo auto-generated method stub
            
}

@ Override
Public void onstatuschanged (string provider, int status, bundle extras ){
// Todo auto-generated method stub
            
}

}

Private void newlocalgps (location)
{
If (location! = NULL)
{
Double latitude = location. getlatitude (); // precision
Double longpolling = location. getlongpolling (); // latitude
Double speed = location. getspeed (); // speed
Double altitude = location. getaltitude (); // altitude
Double bearing = location. getbearing (); // Azimuth
TV. settext ("precision" + latitude + '\ n' +
"Latitude" + longpolling + '\ n' +
"Speed" + speed + "m/s" + '\ n' +
"Altitude" + altitude + "M" + '\ n' +
"Orientation" + bearing + '\ n ');
}
Else
{
// Location where no geographic information is obtained
TV. settext ("the location of geographic information is unknown or the location of geographic information is being obtained ...");
}
}

@ Override
Public Boolean oncreateoptionsmenu (menu ){
// Todo auto-generated method stub
Menu. Add (0, menu_about, 1, "about ");
Menu. Add (0, menu_exit, 2, "exit ");
Return super. oncreateoptionsmenu (menu );
}

@ Override
Public Boolean onoptionsitemselected (menuitem item ){
// Todo auto-generated method stub
Switch (item. getitemid ())
{
Case menu_about:
Alertdialog. Builder BD = new Builder (main. This );
BD. setmessage ("mrgps.apk \ n version: 1.0 \ n Author: mrandexe ");
BD. settitle ("about ");
BD. setpositivebutton ("OK", new onclicklistener (){
@ Override
Public void onclick (dialoginterface arg0, int arg1 ){
// Todo auto-generated method stub
Arg0.dismiss ();
}
});
BD. Create (). Show ();
Break;
Case menu_exit:
Exit ();
Break;
}
Return super. onoptionsitemselected (item );
}

@ Override
Public Boolean onkeydown (INT keycode, keyevent event ){
// Todo auto-generated method stub
If (keycode = keyevent. keycode_back & event. getrepeatcount () = 0)
{
Exit ();
Return true;
}
Return super. onkeydown (keycode, event );
}

Private void exit ()
{
Alertdialog. Builder = new Builder (main. This );
Builder. setmessage ("are you sure you want to exit? ");
Builder. settitle ("prompt ");
Builder. setpositivebutton ("OK", new onclicklistener (){
@ Override
Public void onclick (dialoginterface arg0, int arg1 ){
// Todo auto-generated method stub
Arg0.dismiss ();
Activitymanager actmgr = (activitymanager) getsystemservice (activity_service );
Actmgr. restartpackage (getpackagename ());
}
});
Builder. setnegativebutton ("cancel", new onclicklistener (){

@ Override
Public void onclick (dialoginterface dialog, int which ){
// Todo auto-generated method stub
Dialog. Dismiss ();
}
});
Builder. Create (). Show ();

}
}

Main. xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent">
<TextView android:text="TextView" android:layout_width="wrap_content" android:id="@+id/tv" android:layout_height="wrap_content"></TextView>
</LinearLayout>