| /* |
| * Copyright (C) 20012 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 com.android.server.location; |
| |
| import java.io.PrintWriter; |
| import java.util.Iterator; |
| import java.util.LinkedList; |
| import java.util.List; |
| |
| import android.Manifest.permission; |
| import android.app.PendingIntent; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.location.Location; |
| import android.location.LocationListener; |
| import android.location.LocationManager; |
| import android.os.Bundle; |
| import android.os.Looper; |
| import android.os.PowerManager; |
| import android.os.SystemClock; |
| |
| public class GeofenceManager implements LocationListener, PendingIntent.OnFinished { |
| static final String TAG = "GeofenceManager"; |
| |
| /** |
| * Assume a maximum land speed, as a heuristic to throttle location updates. |
| * (Air travel should result in an airplane mode toggle which will |
| * force a new location update anyway). |
| */ |
| static final int MAX_SPEED_M_S = 100; // 360 km/hr (high speed train) |
| |
| class GeofenceWrapper { |
| final Geofence fence; |
| final long expiry; |
| final String packageName; |
| final PendingIntent intent; |
| |
| public GeofenceWrapper(Geofence fence, long expiry, String packageName, |
| PendingIntent intent) { |
| this.fence = fence; |
| this.expiry = expiry; |
| this.packageName = packageName; |
| this.intent = intent; |
| } |
| } |
| |
| final Context mContext; |
| final LocationManager mLocationManager; |
| final PowerManager.WakeLock mWakeLock; |
| final Looper mLooper; // looper thread to take location updates on |
| |
| // access to members below is synchronized on this |
| Location mLastLocation; |
| List<GeofenceWrapper> mFences = new LinkedList<GeofenceWrapper>(); |
| |
| public GeofenceManager(Context context) { |
| mContext = context; |
| mLocationManager = (LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE); |
| PowerManager powerManager = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE); |
| mWakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, TAG); |
| mLooper = Looper.myLooper(); |
| mLocationManager.requestLocationUpdates(LocationManager.PASSIVE_PROVIDER, 0, 0, this); |
| } |
| |
| public void addFence(double latitude, double longitude, float radius, long expiration, |
| PendingIntent intent, int uid, String packageName) { |
| long expiry = SystemClock.elapsedRealtime() + expiration; |
| if (expiration < 0) { |
| expiry = Long.MAX_VALUE; |
| } |
| Geofence fence = new Geofence(latitude, longitude, radius, mLastLocation); |
| GeofenceWrapper fenceWrapper = new GeofenceWrapper(fence, expiry, packageName, intent); |
| |
| synchronized (this) { |
| mFences.add(fenceWrapper); |
| updateProviderRequirements(); |
| } |
| } |
| |
| public void removeFence(PendingIntent intent) { |
| synchronized (this) { |
| Iterator<GeofenceWrapper> iter = mFences.iterator(); |
| while (iter.hasNext()) { |
| GeofenceWrapper fenceWrapper = iter.next(); |
| if (fenceWrapper.intent.equals(intent)) { |
| iter.remove(); |
| } |
| } |
| updateProviderRequirements(); |
| } |
| } |
| |
| public void removeFence(String packageName) { |
| synchronized (this) { |
| Iterator<GeofenceWrapper> iter = mFences.iterator(); |
| while (iter.hasNext()) { |
| GeofenceWrapper fenceWrapper = iter.next(); |
| if (fenceWrapper.packageName.equals(packageName)) { |
| iter.remove(); |
| } |
| } |
| updateProviderRequirements(); |
| } |
| } |
| |
| void removeExpiredFences() { |
| synchronized (this) { |
| long time = SystemClock.elapsedRealtime(); |
| Iterator<GeofenceWrapper> iter = mFences.iterator(); |
| while (iter.hasNext()) { |
| GeofenceWrapper fenceWrapper = iter.next(); |
| if (fenceWrapper.expiry < time) { |
| iter.remove(); |
| } |
| } |
| } |
| } |
| |
| void processLocation(Location location) { |
| List<PendingIntent> enterIntents = new LinkedList<PendingIntent>(); |
| List<PendingIntent> exitIntents = new LinkedList<PendingIntent>(); |
| |
| synchronized (this) { |
| mLastLocation = location; |
| |
| removeExpiredFences(); |
| |
| for (GeofenceWrapper fenceWrapper : mFences) { |
| int event = fenceWrapper.fence.processLocation(location); |
| if ((event & Geofence.FLAG_ENTER) != 0) { |
| enterIntents.add(fenceWrapper.intent); |
| } |
| if ((event & Geofence.FLAG_EXIT) != 0) { |
| exitIntents.add(fenceWrapper.intent); |
| } |
| } |
| updateProviderRequirements(); |
| } |
| |
| // release lock before sending intents |
| for (PendingIntent intent : exitIntents) { |
| sendIntentExit(intent); |
| } |
| for (PendingIntent intent : enterIntents) { |
| sendIntentEnter(intent); |
| } |
| } |
| |
| void sendIntentEnter(PendingIntent pendingIntent) { |
| Intent intent = new Intent(); |
| intent.putExtra(LocationManager.KEY_PROXIMITY_ENTERING, true); |
| sendIntent(pendingIntent, intent); |
| } |
| |
| void sendIntentExit(PendingIntent pendingIntent) { |
| Intent intent = new Intent(); |
| intent.putExtra(LocationManager.KEY_PROXIMITY_ENTERING, false); |
| sendIntent(pendingIntent, intent); |
| } |
| |
| void sendIntent(PendingIntent pendingIntent, Intent intent) { |
| try { |
| mWakeLock.acquire(); |
| pendingIntent.send(mContext, 0, intent, this, null, permission.ACCESS_FINE_LOCATION); |
| } catch (PendingIntent.CanceledException e) { |
| removeFence(pendingIntent); |
| mWakeLock.release(); |
| } |
| } |
| |
| void updateProviderRequirements() { |
| synchronized (this) { |
| double minDistance = Double.MAX_VALUE; |
| for (GeofenceWrapper alert : mFences) { |
| if (alert.fence.getDistance() < minDistance) { |
| minDistance = alert.fence.getDistance(); |
| } |
| } |
| |
| if (minDistance == Double.MAX_VALUE) { |
| disableLocation(); |
| } else { |
| int intervalMs = (int)(minDistance * 1000) / MAX_SPEED_M_S; |
| setLocationInterval(intervalMs); |
| } |
| } |
| } |
| |
| void setLocationInterval(int intervalMs) { |
| mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, intervalMs, 0, this, |
| mLooper); |
| } |
| |
| void disableLocation() { |
| mLocationManager.removeUpdates(this); |
| } |
| |
| @Override |
| public void onLocationChanged(Location location) { |
| processLocation(location); |
| } |
| |
| @Override |
| public void onStatusChanged(String provider, int status, Bundle extras) { } |
| |
| @Override |
| public void onProviderEnabled(String provider) { } |
| |
| @Override |
| public void onProviderDisabled(String provider) { } |
| |
| @Override |
| public void onSendFinished(PendingIntent pendingIntent, Intent intent, int resultCode, |
| String resultData, Bundle resultExtras) { |
| mWakeLock.release(); |
| } |
| |
| public void dump(PrintWriter pw) { |
| pw.println(" Geofences:"); |
| for (GeofenceWrapper fenceWrapper : mFences) { |
| pw.append(" "); |
| pw.append(fenceWrapper.packageName); |
| pw.append(" "); |
| pw.append(fenceWrapper.fence.toString()); |
| pw.append("\n"); |
| } |
| } |
| } |