Nick Pelly | e0fd693 | 2012-07-11 10:26:13 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | |
| 18 | package com.android.server.location; |
| 19 | |
Nick Pelly | 6fa9ad4 | 2012-07-16 12:18:23 -0700 | [diff] [blame] | 20 | import android.app.PendingIntent; |
| 21 | import android.location.Geofence; |
Nick Pelly | e0fd693 | 2012-07-11 10:26:13 -0700 | [diff] [blame] | 22 | import android.location.Location; |
| 23 | |
| 24 | /** |
Nick Pelly | 6fa9ad4 | 2012-07-16 12:18:23 -0700 | [diff] [blame] | 25 | * Represents state associated with a geofence |
Nick Pelly | e0fd693 | 2012-07-11 10:26:13 -0700 | [diff] [blame] | 26 | */ |
Nick Pelly | 6fa9ad4 | 2012-07-16 12:18:23 -0700 | [diff] [blame] | 27 | public class GeofenceState { |
Nick Pelly | e0fd693 | 2012-07-11 10:26:13 -0700 | [diff] [blame] | 28 | public final static int FLAG_ENTER = 0x01; |
| 29 | public final static int FLAG_EXIT = 0x02; |
| 30 | |
Nick Pelly | 6fa9ad4 | 2012-07-16 12:18:23 -0700 | [diff] [blame] | 31 | private static final int STATE_UNKNOWN = 0; |
| 32 | private static final int STATE_INSIDE = 1; |
| 33 | private static final int STATE_OUTSIDE = 2; |
Nick Pelly | e0fd693 | 2012-07-11 10:26:13 -0700 | [diff] [blame] | 34 | |
Nick Pelly | 6fa9ad4 | 2012-07-16 12:18:23 -0700 | [diff] [blame] | 35 | public final Geofence mFence; |
| 36 | private final Location mLocation; |
| 37 | public final long mExpireAt; |
| 38 | public final String mPackageName; |
| 39 | public final PendingIntent mIntent; |
Nick Pelly | e0fd693 | 2012-07-11 10:26:13 -0700 | [diff] [blame] | 40 | |
| 41 | int mState; // current state |
Victoria Lease | 4cd0a50 | 2012-11-02 16:24:08 -0700 | [diff] [blame^] | 42 | double mDistanceToCenter; // current distance to center of fence |
Nick Pelly | e0fd693 | 2012-07-11 10:26:13 -0700 | [diff] [blame] | 43 | |
Victoria Lease | 4cd0a50 | 2012-11-02 16:24:08 -0700 | [diff] [blame^] | 44 | public GeofenceState(Geofence fence, long expireAt, |
Nick Pelly | 6fa9ad4 | 2012-07-16 12:18:23 -0700 | [diff] [blame] | 45 | String packageName, PendingIntent intent) { |
Nick Pelly | e0fd693 | 2012-07-11 10:26:13 -0700 | [diff] [blame] | 46 | mState = STATE_UNKNOWN; |
Victoria Lease | 4cd0a50 | 2012-11-02 16:24:08 -0700 | [diff] [blame^] | 47 | mDistanceToCenter = Double.MAX_VALUE; |
Nick Pelly | e0fd693 | 2012-07-11 10:26:13 -0700 | [diff] [blame] | 48 | |
Nick Pelly | 6fa9ad4 | 2012-07-16 12:18:23 -0700 | [diff] [blame] | 49 | mFence = fence; |
| 50 | mExpireAt = expireAt; |
| 51 | mPackageName = packageName; |
| 52 | mIntent = intent; |
Nick Pelly | e0fd693 | 2012-07-11 10:26:13 -0700 | [diff] [blame] | 53 | |
| 54 | mLocation = new Location(""); |
Nick Pelly | 6fa9ad4 | 2012-07-16 12:18:23 -0700 | [diff] [blame] | 55 | mLocation.setLatitude(fence.getLatitude()); |
| 56 | mLocation.setLongitude(fence.getLongitude()); |
Nick Pelly | e0fd693 | 2012-07-11 10:26:13 -0700 | [diff] [blame] | 57 | } |
| 58 | |
| 59 | /** |
| 60 | * Process a new location. |
| 61 | * @return FLAG_ENTER or FLAG_EXIT if the fence was crossed, 0 otherwise |
| 62 | */ |
| 63 | public int processLocation(Location location) { |
Victoria Lease | 4cd0a50 | 2012-11-02 16:24:08 -0700 | [diff] [blame^] | 64 | mDistanceToCenter = mLocation.distanceTo(location); |
Nick Pelly | e0fd693 | 2012-07-11 10:26:13 -0700 | [diff] [blame] | 65 | |
| 66 | int prevState = mState; |
| 67 | //TODO: inside/outside detection could be made more rigorous |
Victoria Lease | 4cd0a50 | 2012-11-02 16:24:08 -0700 | [diff] [blame^] | 68 | boolean inside = mDistanceToCenter <= Math.max(mFence.getRadius(), location.getAccuracy()); |
Nick Pelly | e0fd693 | 2012-07-11 10:26:13 -0700 | [diff] [blame] | 69 | if (inside) { |
| 70 | mState = STATE_INSIDE; |
Victoria Lease | 4cd0a50 | 2012-11-02 16:24:08 -0700 | [diff] [blame^] | 71 | if (prevState != STATE_INSIDE) { |
| 72 | return FLAG_ENTER; // return enter if previously exited or unknown |
| 73 | } |
Nick Pelly | e0fd693 | 2012-07-11 10:26:13 -0700 | [diff] [blame] | 74 | } else { |
| 75 | mState = STATE_OUTSIDE; |
Victoria Lease | 4cd0a50 | 2012-11-02 16:24:08 -0700 | [diff] [blame^] | 76 | if (prevState == STATE_INSIDE) { |
| 77 | return FLAG_EXIT; // return exit only if previously entered |
| 78 | } |
Nick Pelly | e0fd693 | 2012-07-11 10:26:13 -0700 | [diff] [blame] | 79 | } |
| 80 | return 0; |
| 81 | } |
| 82 | |
Victoria Lease | 4cd0a50 | 2012-11-02 16:24:08 -0700 | [diff] [blame^] | 83 | /** |
| 84 | * Gets the distance from the current location to the fence's boundary. |
| 85 | * @return The distance or {@link Double#MAX_VALUE} if unknown. |
| 86 | */ |
| 87 | public double getDistanceToBoundary() { |
| 88 | if (Double.compare(mDistanceToCenter, Double.MAX_VALUE) == 0) { |
| 89 | return Double.MAX_VALUE; |
| 90 | } else { |
| 91 | return Math.abs(mFence.getRadius() - mDistanceToCenter); |
| 92 | } |
Nick Pelly | e0fd693 | 2012-07-11 10:26:13 -0700 | [diff] [blame] | 93 | } |
| 94 | |
| 95 | @Override |
| 96 | public String toString() { |
| 97 | String state; |
| 98 | switch (mState) { |
| 99 | case STATE_INSIDE: |
| 100 | state = "IN"; |
| 101 | break; |
| 102 | case STATE_OUTSIDE: |
| 103 | state = "OUT"; |
| 104 | break; |
| 105 | default: |
| 106 | state = "?"; |
| 107 | } |
Victoria Lease | 4cd0a50 | 2012-11-02 16:24:08 -0700 | [diff] [blame^] | 108 | return String.format("%s d=%.0f %s", mFence.toString(), mDistanceToCenter, state); |
Nick Pelly | e0fd693 | 2012-07-11 10:26:13 -0700 | [diff] [blame] | 109 | } |
| 110 | } |