| /* |
| * 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.Geofence; |
| import android.location.Location; |
| import android.location.LocationListener; |
| import android.location.LocationManager; |
| import android.location.LocationRequest; |
| import android.os.Bundle; |
| import android.os.Looper; |
| import android.os.PowerManager; |
| import android.os.SystemClock; |
| import android.util.Log; |
| |
| import com.android.server.LocationManagerService; |
| |
| public class GeofenceManager implements LocationListener, PendingIntent.OnFinished { |
| private static final String TAG = "GeofenceManager"; |
| private static final boolean D = LocationManagerService.D; |
| |
| /** |
| * 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). |
| */ |
| private static final int MAX_SPEED_M_S = 100; // 360 km/hr (high speed train) |
| |
| private final Context mContext; |
| private final LocationManager mLocationManager; |
| private final PowerManager.WakeLock mWakeLock; |
| private final Looper mLooper; // looper thread to take location updates on |
| private final LocationBlacklist mBlacklist; |
| |
| private Object mLock = new Object(); |
| |
| // access to members below is synchronized on mLock |
| private List<GeofenceState> mFences = new LinkedList<GeofenceState>(); |
| |
| public GeofenceManager(Context context, LocationBlacklist blacklist) { |
| 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(); |
| mBlacklist = blacklist; |
| |
| LocationRequest request = new LocationRequest() |
| .setQuality(LocationRequest.POWER_NONE) |
| .setFastestInterval(0); |
| mLocationManager.requestLocationUpdates(request, this, Looper.myLooper()); |
| } |
| |
| public void addFence(LocationRequest request, Geofence geofence, PendingIntent intent, int uid, |
| String packageName) { |
| Location lastLocation = mLocationManager.getLastLocation(); |
| GeofenceState state = new GeofenceState(geofence, lastLocation, |
| request.getExpireAt(), packageName, intent); |
| |
| synchronized (mLock) { |
| // first make sure it doesn't already exist |
| for (int i = mFences.size() - 1; i >= 0; i--) { |
| GeofenceState w = mFences.get(i); |
| if (geofence.equals(w.mFence) && intent.equals(w.mIntent)) { |
| // already exists, remove the old one |
| mFences.remove(i); |
| break; |
| } |
| } |
| mFences.add(state); |
| updateProviderRequirementsLocked(); |
| } |
| } |
| |
| public void removeFence(Geofence fence, PendingIntent intent) { |
| synchronized (mLock) { |
| Iterator<GeofenceState> iter = mFences.iterator(); |
| while (iter.hasNext()) { |
| GeofenceState state = iter.next(); |
| if (state.mIntent.equals(intent)) { |
| |
| if (fence == null) { |
| // alwaus remove |
| iter.remove(); |
| } else { |
| // just remove matching fences |
| if (fence.equals(state.mFence)) { |
| iter.remove(); |
| } |
| } |
| } |
| } |
| updateProviderRequirementsLocked(); |
| } |
| } |
| |
| public void removeFence(String packageName) { |
| synchronized (mLock) { |
| Iterator<GeofenceState> iter = mFences.iterator(); |
| while (iter.hasNext()) { |
| GeofenceState state = iter.next(); |
| if (state.mPackageName.equals(packageName)) { |
| iter.remove(); |
| } |
| } |
| updateProviderRequirementsLocked(); |
| } |
| } |
| |
| private void removeExpiredFencesLocked() { |
| long time = SystemClock.elapsedRealtime(); |
| Iterator<GeofenceState> iter = mFences.iterator(); |
| while (iter.hasNext()) { |
| GeofenceState state = iter.next(); |
| if (state.mExpireAt < time) { |
| iter.remove(); |
| } |
| } |
| } |
| |
| private void processLocation(Location location) { |
| List<PendingIntent> enterIntents = new LinkedList<PendingIntent>(); |
| List<PendingIntent> exitIntents = new LinkedList<PendingIntent>(); |
| |
| synchronized (mLock) { |
| removeExpiredFencesLocked(); |
| |
| for (GeofenceState state : mFences) { |
| if (mBlacklist.isBlacklisted(state.mPackageName)) { |
| if (D) Log.d(TAG, "skipping geofence processing for blacklisted app: " + |
| state.mPackageName); |
| continue; |
| } |
| |
| int event = state.processLocation(location); |
| if ((event & GeofenceState.FLAG_ENTER) != 0) { |
| enterIntents.add(state.mIntent); |
| } |
| if ((event & GeofenceState.FLAG_EXIT) != 0) { |
| exitIntents.add(state.mIntent); |
| } |
| } |
| updateProviderRequirementsLocked(); |
| } |
| |
| // release lock before sending intents |
| for (PendingIntent intent : exitIntents) { |
| sendIntentExit(intent); |
| } |
| for (PendingIntent intent : enterIntents) { |
| sendIntentEnter(intent); |
| } |
| } |
| |
| private void sendIntentEnter(PendingIntent pendingIntent) { |
| Intent intent = new Intent(); |
| intent.putExtra(LocationManager.KEY_PROXIMITY_ENTERING, true); |
| sendIntent(pendingIntent, intent); |
| } |
| |
| private void sendIntentExit(PendingIntent pendingIntent) { |
| Intent intent = new Intent(); |
| intent.putExtra(LocationManager.KEY_PROXIMITY_ENTERING, false); |
| sendIntent(pendingIntent, intent); |
| } |
| |
| private 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(null, pendingIntent); |
| mWakeLock.release(); |
| } |
| } |
| |
| private void updateProviderRequirementsLocked() { |
| double minDistance = Double.MAX_VALUE; |
| for (GeofenceState state : mFences) { |
| if (state.getDistance() < minDistance) { |
| minDistance = state.getDistance(); |
| } |
| } |
| |
| if (minDistance == Double.MAX_VALUE) { |
| disableLocationLocked(); |
| } else { |
| int intervalMs = (int)(minDistance * 1000) / MAX_SPEED_M_S; |
| requestLocationLocked(intervalMs); |
| } |
| } |
| |
| private void requestLocationLocked(int intervalMs) { |
| mLocationManager.requestLocationUpdates(new LocationRequest().setInterval(intervalMs), this, |
| mLooper); |
| } |
| |
| private void disableLocationLocked() { |
| 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 (GeofenceState state : mFences) { |
| pw.append(" "); |
| pw.append(state.mPackageName); |
| pw.append(" "); |
| pw.append(state.mFence.toString()); |
| pw.append("\n"); |
| } |
| } |
| } |