Android Open Source - YahooWeather User Location Utils

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License

The source code is released under:
GNU General Public License
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Java Source Code

package com.imlongluo.weather.apis;
/*from   w  ww  . java  2 s  . c  om*/
import java.util.Timer;
import java.util.TimerTask;

import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;

class UserLocationUtils {
    Timer timer1;

    LocationManager lm;
    LocationResult locationResult;

    boolean gps_enabled = false;
    boolean network_enabled = false;

    /*
     * need permission <uses-permission
     * android:name="android.permission.ACCESS_FINE_LOCATION"/>
     */
    public boolean findUserLocation(Context context, LocationResult result) {
        YahooWeatherLog.d("findUserLocation, result=" + result);
        
        locationResult = result;

        if (lm == null) {
            lm = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
        }

        // exceptions will be thrown if provider is not permitted.
        try {
            gps_enabled = lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
        } catch (Exception ex) {

        }

        try {
            network_enabled = lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
        } catch (Exception ex) {
        }

        // don't start listeners if no provider is enabled
        if (!gps_enabled && !network_enabled) {
            return false;
        }

        if (gps_enabled) {
            lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListenerGps);
        }

        if (network_enabled) {
            lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0,
                    locationListenerNetwork);
        }

        timer1 = new Timer();
        timer1.schedule(new GetLastLocation(), 20000);
        
        return true;
    }

    LocationListener locationListenerGps = new LocationListener() {

    @Override
    public void onLocationChanged(Location location) {
            // timer1.cancel();
            locationResult.gotLocation(location);
            lm.removeUpdates(this);
            lm.removeUpdates(locationListenerNetwork);
    }

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

    @Override
    public void onProviderEnabled(String provider) {
      
    }

    @Override
    public void onProviderDisabled(String provider) {
      
    }
    };

    LocationListener locationListenerNetwork = new LocationListener() {
        @Override
        public void onLocationChanged(Location location) {
            // timer1.cancel();
            locationResult.gotLocation(location);
            lm.removeUpdates(this);
            lm.removeUpdates(locationListenerGps);
        }

        @Override
        public void onProviderDisabled(String provider) {
          
        }

        @Override
        public void onProviderEnabled(String provider) {
          
        }

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

    class GetLastLocation extends TimerTask {
        @Override
        public void run() {
            lm.removeUpdates(locationListenerGps);
            lm.removeUpdates(locationListenerNetwork);

            Location net_loc = null, gps_loc = null;
            if (gps_enabled) {
                gps_loc = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
            }

            if (network_enabled) {
                net_loc = lm.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
            }

            // if there are both values use the latest one
            if (gps_loc != null && net_loc != null) {
                if (gps_loc.getTime() > net_loc.getTime()) {
                    locationResult.gotLocation(gps_loc);
                } else {
                    locationResult.gotLocation(net_loc);
                }

                return;
            }

            if (gps_loc != null) {
                locationResult.gotLocation(gps_loc);
                return;
            }

            if (net_loc != null) {
                locationResult.gotLocation(net_loc);
                return;
            }

            locationResult.gotLocation(null);
        }
    }

    public static interface LocationResult {
        public abstract void gotLocation(Location location);
    }
}
Java Source Code List
