Android Open Source - AndroidLibraryProject Location Data Listener

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Apache License
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Java Source Code

/*
 * Copyright (c) 2014 by CDAC Chennai /*from   w w w.j  a v  a 2s  .  com*/
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * @Original File : GPSTracker
 * @File        LocationDataListener(Modified copy)
 * @Created:    24.04.2014
 * @author:     Prasenjit
 * Last Change: 09.09.2014 by Prasenjit
 */
package com.contextawareframework.backgroundservices;

import android.app.AlertDialog;
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.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.IBinder;
import android.provider.Settings;
import android.util.Log;

/**
 * This clas is listener class for GPS Sensor, can be used just to register the GPS / Location 
 * listener only. If GPS enabled then will try to get the lat / long from GPS else it will try 
 * to get the location details from Network Provider (If the phone has network coverage) 
 * */
public class LocationDataListener extends CAFService{

  private final Context mContext;
  
  // flag for GPS status
  boolean isGPSEnabled = false;

  // flag for network status
  boolean isNetworkEnabled = false;

  // flag for GPS status
  boolean canGetLocation = false;
  
  // Use this string constant to debug this class
    private static final String TAG = "LocationDataListener";
  
    private 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;
  private LocationListener locationListener;
  private static LocationDataListener locationDataListenerInstance;
  
  /**
   * Description : Private constructor. Singleton Pattern to create the class object
   * @param context Calling Activity context
   */
  private LocationDataListener(Context context)
  {
    mContext = context;    
  }

  /**
   * Description : Method to create an instance of LocationDataListener Class.
   * @param context Calling Activity context
   * @return LocationDataListener Class instance
   */
  public static synchronized LocationDataListener getInstance(Context context)
  {
    if (locationDataListenerInstance == null)
      locationDataListenerInstance = new LocationDataListener(context);

    return locationDataListenerInstance;
  }
  
  public void enableLocationListener(String provider, long minTime, float minDistance, LocationListener locationListener)
  {
    location = getLocation(provider, minTime, minDistance, locationListener);
  }
  public void disableLocationListener(LocationListener listenerFromActivity)
  {
    stopUsingGPS(listenerFromActivity);
  }
  /**
   * @author Rekha N
     * Checking for all possible internet providers
     * **/
      
    public boolean isConnectingToInternet()
    {
        ConnectivityManager connectivity = (ConnectivityManager) mContext.getSystemService(Context.CONNECTIVITY_SERVICE);
          if (connectivity != null)
          {
              NetworkInfo[] info = connectivity.getAllNetworkInfo();
              if (info != null)
                  for (int i = 0; i < info.length; i++)
                      if (info[i].getState() == NetworkInfo.State.CONNECTED)
                      {
                          return true;
                      }  
          }
          return false;
    }
  public Location getLocation(String provider, long minTime, float minDistance, LocationListener locationListener) {
    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
        Log.d(TAG,"No service available to get the location. Network and GPS both are disable or not available");
        
      }
      else
      {
        this.canGetLocation = true;
        if (isNetworkEnabled) {
          // This line need to be changed
          //locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,MIN_TIME_BW_UPDATES,MIN_DISTANCE_CHANGE_FOR_UPDATES, locationListener); // Now this will be implemented in user level
          
          locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,minTime, minDistance, locationListener); // Now this will be implemented in user level
          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) {
          if (location == null) {
            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 10, 60000, locationListener);
            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;
  }
  
  /**
   * Stop using GPS listener
   * Calling this function will stop using GPS in your app
   * */
  public void stopUsingGPS(LocationListener locationListener){
    if(locationManager != null){
      locationManager.removeUpdates(locationListener);
    }    
  }
  
  /**
   * 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("GPS settings");
 
        // Setting Dialog Message
        alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");
 
        // On pressing Settings button
        alertDialog.setPositiveButton("Settings", 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("Cancel", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
            dialog.cancel();
            }
        });
 
        // Showing Alert Message
        alertDialog.show();
  }

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

}
Java Source Code List
