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/*
* Copyright (C) 2012 The Android Open Source Project
*
* 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.
*/
package android.bordeaux.services;
import android.content.Context;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.location.LocationProvider;
import android.os.Bundle;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Message;
import android.os.Process;
import android.util.Log;
import java.util.HashMap;
import java.util.Map;
// TODO: add functionality to detect speed (use GPS) when needed
// withouth draining the battery quickly
public class LocationStatsAggregator extends Aggregator {
final String TAG = "LocationStatsAggregator";
public static final String CURRENT_LOCATION = "Current Location";
public static final String CURRENT_SPEED = "Current Speed";
public static final String UNKNOWN_LOCATION = "Unknown Location";
// TODO: Collect location on every minute
private static final long MINIMUM_TIME = 30000; // milliseconds
// reset best location provider on every 5 minutes
private static final int BEST_PROVIDER_DURATION = 300000;
private static final float MINIMUM_DISTANCE = 0f; // meter
private static final int LOCATION_CHANGE = 1;
// record time when the location provider is set
private long mProviderSetTime;
private Handler mHandler;
private HandlerThread mHandlerThread;
private LocationManager mLocationManager;
private ClusterManager mClusterManager;
public LocationStatsAggregator(final Context context) {
mLocationManager =
(LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
setClusteringThread(context);
requestLocationUpdate();
}
public String[] getListOfFeatures(){
String[] list = { CURRENT_LOCATION } ;
return list;
}
public Map<String,String> getFeatureValue(String featureName) {
HashMap<String,String> feature = new HashMap<String,String>();
if (featureName.equals(CURRENT_LOCATION)) {
// TODO: check last known location first before sending out location request.
/*
Location location =
mLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
*/
String location = mClusterManager.getSemanticLocation();
if (!location.equals(UNKNOWN_LOCATION)) {
feature.put(CURRENT_LOCATION, location);
}
}
return (Map) feature;
}
private void setClusteringThread(Context context) {
mClusterManager = new ClusterManager(context);
mHandlerThread = new HandlerThread("Location Handler",
Process.THREAD_PRIORITY_BACKGROUND);
mHandlerThread.start();
mHandler = new Handler(mHandlerThread.getLooper()) {
@Override
public void handleMessage(Message msg) {
if (!(msg.obj instanceof Location)) {
return;
}
Location location = (Location) msg.obj;
switch(msg.what) {
case LOCATION_CHANGE:
mClusterManager.addSample(location);
break;
default:
super.handleMessage(msg);
}
}
};
}
private void requestLocationUpdate() {
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_COARSE);
criteria.setPowerRequirement(Criteria.POWER_LOW);
/*
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setSpeedRequired(true);
*/
criteria.setCostAllowed(true);
String bestProvider = mLocationManager.getBestProvider(criteria, false);
Log.i(TAG, "Best Location Provider: " + bestProvider);
String bestAvailableProvider = mLocationManager.getBestProvider(criteria, true);
Log.i(TAG, "Best Available Location Provider: " + bestAvailableProvider);
mProviderSetTime = System.currentTimeMillis();
if (bestAvailableProvider != null) {
mLocationManager.requestLocationUpdates(
bestAvailableProvider, MINIMUM_TIME, MINIMUM_DISTANCE, mLocationListener);
}
}
private final LocationListener mLocationListener = new LocationListener() {
public void onLocationChanged(Location location) {
long currentTime = location.getTime();
if (currentTime - mProviderSetTime < MINIMUM_TIME) {
return;
}
mHandler.sendMessage(mHandler.obtainMessage(LOCATION_CHANGE, location));
// search again for the location service
if (currentTime - mProviderSetTime > BEST_PROVIDER_DURATION) {
mLocationManager.removeUpdates(this);
Log.e(TAG, "reselect best location provider");
requestLocationUpdate();
}
}
public void onStatusChanged(String provider, int status, Bundle extras) { }
public void onProviderEnabled(String provider) { }
public void onProviderDisabled(String provider) { }
};
}
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