Refresh / Update Location more frequently

FeongxD

Hi, I'm making a gps app using android mode, currently tested on my xperia z. Everything is working fine, except the refresh/update rate is slow, it takes about 12sec-14sec to update my location once. I haven't try anything yet, please help me if you guys know about this thanks

my code :

import android.content.Context;
import android.location.*;
import android.os.Bundle;
LocationManager manager;
GPSLocationListener gps;
float latitude;
float longitude;
float accuracy;
String provider;


class GPSLocationListener implements LocationListener
{
  void onLocationChanged( Location _loc )
  {
    latitude = (float) _loc.getLatitude();
    longitude = (float) _loc.getLongitude();
    accuracy = (float) _loc.getAccuracy();
    provider = _loc.getProvider();
  }
  void onProviderDisabled( String _provider )
  {
    provider = "";
  }
  void onProviderEnabled( String _provider )
  {
    provider = _provider;
  }
  void onStatusChanged( String _provider, int status, Bundle xtras )
  {
  }
}
void setup()
{
  orientation( PORTRAIT );
  latitude = 0;
  longitude = 0;
  accuracy = 0;
  provider = "";

  textSize(50);
}


void draw()
{
  background( 5, 10, 85 );
  fill( 250, 255, 13 );
  noStroke();
  translate( width/2, height/2 );
  String msg = "Latitude: " + latitude + "\n";
  msg += "Longitude: " + longitude + "\n";
  msg += "Accuracy: " + accuracy + "\n";
  msg += "Provider: " + provider;
  textAlign( CENTER, CENTER );
  text( msg, 0, 0 );
}


void onResume()
{
  super.onResume();
  gps = new GPSLocationListener();
  manager = (LocationManager) getSystemService( Context.LOCATION_SERVICE );
  manager.requestLocationUpdates( LocationManager.NETWORK_PROVIDER, 
  0, 0, gps );
}
void onPause()
{
  super.onPause();
}

riccardoch

Try this class:

import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.IBinder;
import android.provider.Settings;
import android.util.Log;

public class GPSTracker extends Service implements LocationListener {

  private final Context mContext;

  // flag for GPS status
  boolean isGPSEnabled = false;

  // flag for network status
  boolean isNetworkEnabled = false;

  // TIPO DI PROVIDER TROVATO
  String PROVIDERgps = "";

  // flag for GPS status
  boolean canGetLocation = false;

  Location location; // location
  double latitude; // latitude
  double longitude; // longitude

    // The minimum distance to change Updates in meters
  private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters

  // The minimum time between updates in milliseconds
  private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute

  // Declaring a Location Manager
  protected LocationManager locationManager;

  public GPSTracker(Context context) {
    this.mContext = context;
    getLocation();
  }

  public Location getLocation() {
    try {
      locationManager = (LocationManager) mContext
        .getSystemService(LOCATION_SERVICE);

      // getting GPS status
      isGPSEnabled = locationManager
        .isProviderEnabled(LocationManager.GPS_PROVIDER);

      // getting network status
      isNetworkEnabled = locationManager
        .isProviderEnabled(LocationManager.NETWORK_PROVIDER);

      if (!isGPSEnabled && !isNetworkEnabled) {
        // no network provider is enabled
        PROVIDERgps = "null";
      } 
      else {
        this.canGetLocation = true;
        // First get location from Network Provider
        if (isNetworkEnabled) {
          //
          PROVIDERgps = "Network";
          //
          locationManager.requestLocationUpdates(
          LocationManager.NETWORK_PROVIDER, 
          MIN_TIME_BW_UPDATES, 
          MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
          Log.d("Network", "Network");
          if (locationManager != null) {
            location = locationManager
              .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
            if (location != null) {
              latitude = location.getLatitude();
              longitude = location.getLongitude();
            }
          }
        }
        // if GPS Enabled get lat/long using GPS Services
        if (isGPSEnabled) {
          //
          PROVIDERgps = "GPS";
          //
          if (location == null) {
            locationManager.requestLocationUpdates(
            LocationManager.GPS_PROVIDER, 
            MIN_TIME_BW_UPDATES, 
            MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
            Log.d("GPS Enabled", "GPS Enabled");
            if (locationManager != null) {
              location = locationManager
                .getLastKnownLocation(LocationManager.GPS_PROVIDER);
              if (location != null) {
                latitude = location.getLatitude();
                longitude = location.getLongitude();
              }
            }
          }
        }
      }
    } 
    catch (Exception e) {
      e.printStackTrace();
    }

    return location;
  }

  public String getPROVIDERgps() {
    return PROVIDERgps;
  }



  // Stop using GPS listener
  // Calling this function will stop using GPS in your app

  public void stopUsingGPS() {
    if (locationManager != null) {
      locationManager.removeUpdates(GPSTracker.this);
    }
  }


  // Function to get latitude

  public double getLatitude() {
    if (location != null) {
      latitude = location.getLatitude();
    }

    // return latitude
    return latitude;
  }


  // Function to get longitude

    public double getLongitude() {
    if (location != null) {
      longitude = location.getLongitude();
    }

    // return longitude
    return longitude;
  }


  // Function to check GPS/wifi enabled
  // @return boolean

  public boolean canGetLocation() {
    return this.canGetLocation;
  }


  // Function to show settings alert dialog
  // On pressing Settings button will lauch Settings Options

  public void showSettingsAlert() {
    AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);

    // Setting Dialog Title
    alertDialog.setTitle("Impostazioni GPS");

    // Setting Dialog Message
    alertDialog.setMessage("Il GPS non è abilitato. Vuoi andare al menù impostazioni GPS?");

    // On pressing Settings button
    alertDialog.setPositiveButton("Impostazioni", new DialogInterface.OnClickListener() {
      public void onClick(DialogInterface dialog, int which) {
        Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
        mContext.startActivity(intent);
      }
    }
    );

    // on pressing cancel button
    alertDialog.setNegativeButton("Annulla", new DialogInterface.OnClickListener() {
      public void onClick(DialogInterface dialog, int which) {
        dialog.cancel();
      }
    }
    );

    // Showing Alert Message
    alertDialog.show();
  }

  @Override
    public void onLocationChanged(Location location) {
  }

  @Override
    public void onProviderDisabled(String provider) {
  }

  @Override
    public void onProviderEnabled(String provider) {
  }

  @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
  }

  @Override
    public IBinder onBind(Intent arg0) {
    return null;
  }
}

FeongxD

i've tried but it doesn't run and with many errors, i'm just a beginner so i didn't know how to correct the error.

riccardoch

Try this method for using that class

import android.widget.Toast;                       // TOAST notifications

boolean GPS = false;
String GPSprovider = "null";
double mapCenterLat = 0;
double mapCenterLon = 0;
double OLDmapCenterLat = 0;
double OLDmapCenterLon = 0;

    void UPDATEgps() {
      GPSTracker gps = new GPSTracker(this);

      // check if GPS enabled     
      if (gps.canGetLocation()) {

        if ( gps.getPROVIDERgps().equals("null") == true ) GPS = false;
        else GPS = true;

        GPSprovider = gps.getPROVIDERgps();

        OLDmapCenterLat = mapCenterLat ;
        OLDmapCenterLon = mapCenterLon;

        mapCenterLat = gps.getLatitude();
        mapCenterLon = gps.getLongitude();
      }
      else {
        // can't get location
        // GPS or Network is not enabled
        // Ask user to enable GPS/network in settings
        gps.showSettingsAlert();
      }
      if ( OLDmapCenterLat != mapCenterLat || OLDmapCenterLon != mapCenterLon ) {
Toast.makeText(this, "Lat: " + mapCenterLat + "\nLon: " + mapCenterLon, 3000).show();

          TOASTandroid("Posizione aggiornata tramite "+GPSprovider+"\n\nLat: " + mapCenterLat + "\nLon: " + mapCenterLon, 3000);
      }
    }