Android Open Source - android-roadkill G P S Handler

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License

The source code is released under:

GNU General Public License

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Java Source Code

/* This class manages the use of the GPS */ 
/*  ww w  .  ja va2  s . com*/
package edu.ucdavis.cros.roadkill;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.Location;
import android.location.LocationManager;
import android.provider.Settings;
import android.widget.Toast;

public class GPSHandler extends Activity {

  private LocationManager lm;
  private Context rkContext;

  public GPSHandler(LocationManager locationmanager, Context roadkill) {
    lm = locationmanager;
    rkContext = roadkill;
  }

  // returns true if GPS is enabled and false if disabled
  public boolean isEnabled() {
    if (lm.isProviderEnabled(LocationManager.GPS_PROVIDER))
      return true;
    else
      return false;
  }

  //creates an alert that prompts user to enable GPS
  public void promptEnable() {
    // if GPS is not enabled, prompt user to enable GPS
    AlertDialog.Builder alert = new AlertDialog.Builder(rkContext);
    alert.setTitle("GPS not enabled:");
    alert.setMessage("Would you like to enable GPS?");

    // is user chooses yes, open up GPS settings
    alert.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
      public void onClick(DialogInterface dialog, int whichButton) {
        Intent i = new Intent(Settings.ACTION_SECURITY_SETTINGS);
        Roadkill rk = (Roadkill) rkContext;
        rk.startActivityForResult(i, Roadkill.GPS_BMP);
      }
    });

    // if user chooses no, show a warning message
    alert.setNegativeButton("No", new DialogInterface.OnClickListener() {
      public void onClick(DialogInterface dialog, int whichButton) {
        Toast.makeText(rkContext,
            "Cannot retrieve location because GPS is not enabled.",
            Toast.LENGTH_LONG).show();
      }
    });
    alert.show();
  }

  //gets the longitude and latitude from GPS
  public void getLocation() {
    try {
      Location location = lm
          .getLastKnownLocation(LocationManager.GPS_PROVIDER);
      Roadkill.LATITUDE = String.format("%f", location.getLatitude());
      Roadkill.LONGITUDE = String.format("%f", location.getLongitude());
      Toast.makeText(
          rkContext,
          "Location set to " + Roadkill.LATITUDE + ", "
              + Roadkill.LONGITUDE, Toast.LENGTH_LONG).show();
    } catch (Exception except) {
    }
  }

  //sets the coordinates to location button
  public void setLocation() {
    StringBuffer loc = new StringBuffer();
    loc.append(Roadkill.LATITUDE);
    loc.append(",");
    loc.append(Roadkill.LONGITUDE);
    (Roadkill.locationButton).setText(loc.toString());
  }
}

Java Source Code List