Android Introduction GPS positioning

First, Locationmanager

Locationmangager, location Manager. To operate the device, you must first define a locationmanager.

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1. Locationmanger locationmanager= (Locationmanager)this.getsystemservice (Context.location_service);

Second, Locationlistener

Locationlistener, position monitoring, monitoring position change, monitoring device switch and status.

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2. Defined
4. Locationlistener locationlistener=New Locationlistener () {
6. //Trigger when position information changes
8. public void onlocationchanged (location location) {
10. System.out.println ("Time:" +location.gettime ());
12. System.out.println ("Longitude:" +location.getlongitude ());
14. System.out.println ("Latitude:" +location.getlatitude ());
16. System.out.println ("Elevation:" +location.getaltitude ());
18. }
20. //gps triggered when disabled
22. public void onproviderdisabled (String provider) {
24. System.out.println ("Current GPS Status: Disable \ n");
26. }
28. //gps triggered when open
30. public void onproviderenabled (String provider) {
32. System.out.println ("Current GPS status: on \ n");
34. }
36. Trigger when//gps state changes
38. public void Onstatuschanged (String provider, int status,bundle extras) {
40. if (status==locationprovider.available) {
42. System.out.println ("Current GPS status: Visible \ n");
44. }Else if (status==locationprovider.out_of_service) {
46. System.out.println ("Current GPS status: Outside service area \ n");
48. }Else if (status==locationprovider.temporarily_unavailable) {
50. System.out.println ("Current GPS status: Suspend service \ n");
52. }
54. }
56. };
58. Binding monitoring, with 4 parameters
60. Parameter 1, equipment: There are gps_provider and network_provider two kinds, we choose GPS, the network does not discuss
62. Parameter 2, location information update period:
64. Parameter 3, Position change minimum distance: location information is updated when the location distance changes beyond this value
66. Parameter 4, monitoring
68. Note: Parameters 2 and 3, if the parameter 3 is not 0, the parameter 3 is the same, the parameter 3 is 0, the time is updated periodically, the two is 0, is refreshed at any time
70. Locationmanager.requestlocationupdates (Locationmanager.gps_provider, 0, Locationlistener);

Third, location

Locations, location information, location information, time, latitude and longitude, altitude and other locations can be obtained. The above uses the Locationlistener inside the onlocationchanged () to obtain the location, the following describes how to proactively obtain location.

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1. Location Location=locationmanager.getlastknownlocation (locationmanager.gps_provider);
2. System.out.println ("Time:" +location.gettime ());
3. System.out.println ("Longitude:" +location.getlongitude ());

Note: Each parameter value for location obtained by location Location=new location (Locationmanager.gps_provider) is 0.

Iv. Gpsstatus.listener

Gpsstatus.listener, GPS status monitoring, including GPS start, stop, first positioning, satellite changes and other events.

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2. Defined
4. Gpsstatus.listener gpsstatuslistener=New Gpsstatus.listener () {
6. public void ongpsstatuschanged (int event) {
8. if (event==gpsstatus.gps_event_first_fix) {
10. //First time positioning
12. }Else if (event==gpsstatus.gps_event_satellite_status) {
14. //Satellite status change
16. Gpsstatus gpsstauts= locationmanager.getgpsstatus (null); //Take current status
18. int maxsatellites = Gpsstauts.getmaxsatellites (); //Get the default maximum number of satellites
20. Iterator<gpssatellite> it = Gpsstatus.getsatellites (). Iterator (); //Create an iterator to save all satellites
22. int count = 0;
24. While (It.hasnext () && count <= maxsatellites) {
26. count++;
28. Gpsstatellite s = it.next ();
30. }
32. System.out.println ("Search to:" +count+"satellite");
34. }Else if (event==gpsstatus.gps_event_started) {
36. //Positioning start
38. }Else if (event==gpsstatus.gps_event_stopped) {
40. //end of position
42. }
44. }
46. };
48. Binding
50. Locationmanager.addgpsstatuslistener (Gpsstatuslistener);

Wu, Gpsstatus

Gpsstatus,gps state information, we use the gpsstatus when the satellite state changes.

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1. //instantiate   
2. Gpsstatus  gpsstatus = locationmanager.getgpsstatus (null);  //  take the current state   
3. //get the default maximum number of satellites   
4. int maxsatellites = gpsstatus.getmaxsatellites ();     
5. //get the first time to locate (boot to first position)   
6. int costtime=gpsstatus.gettimetofirstfix ();   
7. //acquiring satellite   
8. iterable<gpssatellite> iterable= Gpsstatus.getsatellites ();   
9. //General conversion to iterator  
10. iterator<gpssatellite> itrator=iterable.iterator ();   

Liu, Gpssatellite

Gpssatellite, positioning satellite, including the satellite's azimuth, height, pseudo-random noise code, signal-to-noise ratio and other information.

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2. Get satellite
4. Iterable<gpssatellite> iterable=gpsstatus.getsatellites ();
6. Convert to iterator again
8. Iterator<gpssatellite> Itrator=iterable.iterator ();
10. Reorganize to ArrayList by traversing
12. arraylist<gpssatellite> satellitelist=New arraylist<gpssatellite> ();
14. int count=0;
16. int maxsatellites=gpsstatus.getmaxsatellites ();
18. while (Itrator.hasnext () && count <= maxsatellites) {
20. count++;
22. Satellite = Itrator.next ();
24. Statellitelist.add (satellite);
26. }
28. System.out.println ("Total search for" +count+"satellites");
30. Output satellite information
32. for (int i=0;i<satellitelist.size (); i++) {
34. //Azimuth of the satellite, floating-point data
36. System.out.println (Satellitelist.get (i). Getazimuth ());
38. //satellite height, floating-point data
40. System.out.println (Satellitelist.get (i). Getelevation ());
42. //Satellite pseudo-random noise code, shaping data
44. System.out.println (Satellitelist.get (i). GETPRN ());
46. //satellite signal-to-noise ratio, floating-point data
48. System.out.println (Satellitelist.get (i). Getsnr ());
50. //Whether the satellite has a calendar table, Boolean data
52. System.out.println (Satellitelist.get (i). Hasalmanac ());
54. //Whether the satellite has a Ephemeris table, Boolean data
56. System.out.println (Satellitelist.get (i). Hasephemeris ());
58. //Whether the satellite was used for recent GPS correction calculations
60. System.out.println (Satellitelist.get (i). Hasalmanac ());
62. }

Android Introduction GPS positioning