2416e09649
Moving the detection out of UiModeManagerService will make it easy for other services to register for the information. Fixed a bugs related to updating twilight state when the time is updated. We're using the same algorithm as before for passively tracking the location. Ideally we should update it to use the new location manager features for low-power location requests. Change-Id: I520c53b9946ab6f8d994587d357fd6542c300c07
568 lines
21 KiB
Java
568 lines
21 KiB
Java
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.server;
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import android.app.AlarmManager;
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import android.app.PendingIntent;
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import android.content.BroadcastReceiver;
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import android.content.Context;
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import android.content.Intent;
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import android.content.IntentFilter;
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import android.location.Criteria;
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import android.location.Location;
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import android.location.LocationListener;
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import android.location.LocationManager;
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import android.os.Bundle;
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import android.os.Handler;
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import android.os.Message;
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import android.os.SystemClock;
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import android.text.format.DateUtils;
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import android.text.format.Time;
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import android.util.Slog;
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import java.text.DateFormat;
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import java.util.ArrayList;
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import java.util.Date;
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import java.util.Iterator;
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import libcore.util.Objects;
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/**
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* Figures out whether it's twilight time based on the user's location.
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*
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* Used by the UI mode manager and other components to adjust night mode
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* effects based on sunrise and sunset.
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*/
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public final class TwilightService {
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private static final String TAG = "TwilightService";
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private static final boolean DEBUG = true;
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private static final String ACTION_UPDATE_TWILIGHT_STATE =
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"com.android.server.action.UPDATE_TWILIGHT_STATE";
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private final Context mContext;
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private final AlarmManager mAlarmManager;
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private final LocationManager mLocationManager;
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private final LocationHandler mLocationHandler;
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private final Object mLock = new Object();
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private final ArrayList<TwilightListenerRecord> mListeners =
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new ArrayList<TwilightListenerRecord>();
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private boolean mSystemReady;
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private TwilightState mTwilightState;
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public TwilightService(Context context) {
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mContext = context;
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mAlarmManager = (AlarmManager)mContext.getSystemService(Context.ALARM_SERVICE);
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mLocationManager = (LocationManager)mContext.getSystemService(Context.LOCATION_SERVICE);
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mLocationHandler = new LocationHandler();
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}
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void systemReady() {
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synchronized (mLock) {
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mSystemReady = true;
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IntentFilter filter = new IntentFilter(Intent.ACTION_AIRPLANE_MODE_CHANGED);
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filter.addAction(Intent.ACTION_TIME_CHANGED);
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filter.addAction(Intent.ACTION_TIMEZONE_CHANGED);
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filter.addAction(ACTION_UPDATE_TWILIGHT_STATE);
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mContext.registerReceiver(mUpdateLocationReceiver, filter);
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if (!mListeners.isEmpty()) {
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mLocationHandler.enableLocationUpdates();
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}
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}
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}
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/**
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* Gets the current twilight state.
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*
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* @return The current twilight state, or null if no information is available.
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*/
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public TwilightState getCurrentState() {
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synchronized (mLock) {
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return mTwilightState;
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}
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}
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/**
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* Listens for twilight time.
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*
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* @param listener The listener.
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* @param handler The handler on which to post calls into the listener.
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*/
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public void registerListener(TwilightListener listener, Handler handler) {
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synchronized (mLock) {
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mListeners.add(new TwilightListenerRecord(listener, handler));
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if (mSystemReady && mListeners.size() == 1) {
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mLocationHandler.enableLocationUpdates();
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}
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}
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}
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private void setTwilightState(TwilightState state) {
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synchronized (mLock) {
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if (!Objects.equal(mTwilightState, state)) {
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if (DEBUG) {
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Slog.d(TAG, "Twilight state changed: " + state);
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}
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mTwilightState = state;
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int count = mListeners.size();
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for (int i = 0; i < count; i++) {
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mListeners.get(i).post();
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}
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}
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}
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}
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// The user has moved if the accuracy circles of the two locations don't overlap.
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private static boolean hasMoved(Location from, Location to) {
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if (to == null) {
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return false;
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}
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if (from == null) {
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return true;
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}
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// if new location is older than the current one, the device hasn't moved.
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if (to.getElapsedRealtimeNano() < from.getElapsedRealtimeNano()) {
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return false;
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}
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// Get the distance between the two points.
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float distance = from.distanceTo(to);
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// Get the total accuracy radius for both locations.
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float totalAccuracy = from.getAccuracy() + to.getAccuracy();
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// If the distance is greater than the combined accuracy of the two
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// points then they can't overlap and hence the user has moved.
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return distance >= totalAccuracy;
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}
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/**
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* Describes whether it is day or night.
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* This object is immutable.
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*/
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public static final class TwilightState {
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private final boolean mIsNight;
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private final long mYesterdaySunset;
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private final long mTodaySunrise;
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private final long mTodaySunset;
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private final long mTomorrowSunrise;
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TwilightState(boolean isNight,
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long yesterdaySunset,
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long todaySunrise, long todaySunset,
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long tomorrowSunrise) {
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mIsNight = isNight;
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mYesterdaySunset = yesterdaySunset;
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mTodaySunrise = todaySunrise;
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mTodaySunset = todaySunset;
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mTomorrowSunrise = tomorrowSunrise;
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}
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/**
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* Returns true if it is currently night time.
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*/
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public boolean isNight() {
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return mIsNight;
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}
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/**
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* Returns the time of yesterday's sunset in the System.currentTimeMillis() timebase,
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* or -1 if the sun never sets.
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*/
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public long getYesterdaySunset() {
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return mYesterdaySunset;
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}
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/**
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* Returns the time of today's sunrise in the System.currentTimeMillis() timebase,
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* or -1 if the sun never rises.
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*/
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public long getTodaySunrise() {
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return mTodaySunrise;
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}
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/**
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* Returns the time of today's sunset in the System.currentTimeMillis() timebase,
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* or -1 if the sun never sets.
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*/
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public long getTodaySunset() {
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return mTodaySunset;
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}
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/**
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* Returns the time of tomorrow's sunrise in the System.currentTimeMillis() timebase,
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* or -1 if the sun never rises.
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*/
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public long getTomorrowSunrise() {
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return mTomorrowSunrise;
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}
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@Override
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public boolean equals(Object o) {
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return o instanceof TwilightState && equals((TwilightState)o);
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}
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public boolean equals(TwilightState other) {
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return other != null
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&& mIsNight == other.mIsNight
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&& mYesterdaySunset == other.mYesterdaySunset
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&& mTodaySunrise == other.mTodaySunrise
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&& mTodaySunset == other.mTodaySunset
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&& mTomorrowSunrise == other.mTomorrowSunrise;
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}
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@Override
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public int hashCode() {
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return 0; // don't care
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}
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@Override
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public String toString() {
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DateFormat f = DateFormat.getDateTimeInstance();
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return "{TwilightState: isNight=" + mIsNight
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+ ", mYesterdaySunset=" + f.format(new Date(mYesterdaySunset))
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+ ", mTodaySunrise=" + f.format(new Date(mTodaySunrise))
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+ ", mTodaySunset=" + f.format(new Date(mTodaySunset))
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+ ", mTomorrowSunrise=" + f.format(new Date(mTomorrowSunrise))
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+ "}";
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}
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}
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/**
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* Listener for changes in twilight state.
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*/
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public interface TwilightListener {
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public void onTwilightStateChanged();
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}
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private static final class TwilightListenerRecord implements Runnable {
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private final TwilightListener mListener;
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private final Handler mHandler;
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public TwilightListenerRecord(TwilightListener listener, Handler handler) {
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mListener = listener;
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mHandler = handler;
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}
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public void post() {
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mHandler.post(this);
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}
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@Override
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public void run() {
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mListener.onTwilightStateChanged();
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}
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}
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private final class LocationHandler extends Handler {
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private static final int MSG_ENABLE_LOCATION_UPDATES = 1;
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private static final int MSG_GET_NEW_LOCATION_UPDATE = 2;
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private static final int MSG_PROCESS_NEW_LOCATION = 3;
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private static final int MSG_DO_TWILIGHT_UPDATE = 4;
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private static final long LOCATION_UPDATE_MS = 24 * DateUtils.HOUR_IN_MILLIS;
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private static final long MIN_LOCATION_UPDATE_MS = 30 * DateUtils.MINUTE_IN_MILLIS;
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private static final float LOCATION_UPDATE_DISTANCE_METER = 1000 * 20;
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private static final long LOCATION_UPDATE_ENABLE_INTERVAL_MIN = 5000;
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private static final long LOCATION_UPDATE_ENABLE_INTERVAL_MAX =
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15 * DateUtils.MINUTE_IN_MILLIS;
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private static final double FACTOR_GMT_OFFSET_LONGITUDE =
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1000.0 * 360.0 / DateUtils.DAY_IN_MILLIS;
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private boolean mPassiveListenerEnabled;
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private boolean mNetworkListenerEnabled;
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private boolean mDidFirstInit;
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private long mLastNetworkRegisterTime = -MIN_LOCATION_UPDATE_MS;
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private long mLastUpdateInterval;
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private Location mLocation;
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private final TwilightCalculator mTwilightCalculator = new TwilightCalculator();
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public void processNewLocation(Location location) {
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Message msg = obtainMessage(MSG_PROCESS_NEW_LOCATION, location);
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sendMessage(msg);
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}
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public void enableLocationUpdates() {
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sendEmptyMessage(MSG_ENABLE_LOCATION_UPDATES);
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}
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public void requestLocationUpdate() {
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sendEmptyMessage(MSG_GET_NEW_LOCATION_UPDATE);
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}
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public void requestTwilightUpdate() {
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sendEmptyMessage(MSG_DO_TWILIGHT_UPDATE);
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}
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@Override
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public void handleMessage(Message msg) {
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switch (msg.what) {
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case MSG_PROCESS_NEW_LOCATION: {
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final Location location = (Location)msg.obj;
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final boolean hasMoved = hasMoved(mLocation, location);
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final boolean hasBetterAccuracy = mLocation == null
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|| location.getAccuracy() < mLocation.getAccuracy();
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if (DEBUG) {
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Slog.d(TAG, "Processing new location: " + location
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+ ", hasMoved=" + hasMoved
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+ ", hasBetterAccuracy=" + hasBetterAccuracy);
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}
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if (hasMoved || hasBetterAccuracy) {
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setLocation(location);
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}
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break;
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}
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case MSG_GET_NEW_LOCATION_UPDATE:
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if (!mNetworkListenerEnabled) {
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// Don't do anything -- we are still trying to get a
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// location.
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return;
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}
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if ((mLastNetworkRegisterTime + MIN_LOCATION_UPDATE_MS) >=
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SystemClock.elapsedRealtime()) {
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// Don't do anything -- it hasn't been long enough
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// since we last requested an update.
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return;
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}
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// Unregister the current location monitor, so we can
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// register a new one for it to get an immediate update.
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mNetworkListenerEnabled = false;
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mLocationManager.removeUpdates(mEmptyLocationListener);
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// Fall through to re-register listener.
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case MSG_ENABLE_LOCATION_UPDATES:
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// enable network provider to receive at least location updates for a given
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// distance.
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boolean networkLocationEnabled;
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try {
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networkLocationEnabled =
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mLocationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
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} catch (Exception e) {
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// we may get IllegalArgumentException if network location provider
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// does not exist or is not yet installed.
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networkLocationEnabled = false;
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}
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if (!mNetworkListenerEnabled && networkLocationEnabled) {
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mNetworkListenerEnabled = true;
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mLastNetworkRegisterTime = SystemClock.elapsedRealtime();
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mLocationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,
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LOCATION_UPDATE_MS, 0, mEmptyLocationListener);
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if (!mDidFirstInit) {
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mDidFirstInit = true;
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if (mLocation == null) {
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retrieveLocation();
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}
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}
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}
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// enable passive provider to receive updates from location fixes (gps
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// and network).
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boolean passiveLocationEnabled;
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try {
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passiveLocationEnabled =
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mLocationManager.isProviderEnabled(LocationManager.PASSIVE_PROVIDER);
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} catch (Exception e) {
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// we may get IllegalArgumentException if passive location provider
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// does not exist or is not yet installed.
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passiveLocationEnabled = false;
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}
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if (!mPassiveListenerEnabled && passiveLocationEnabled) {
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mPassiveListenerEnabled = true;
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mLocationManager.requestLocationUpdates(LocationManager.PASSIVE_PROVIDER,
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0, LOCATION_UPDATE_DISTANCE_METER , mLocationListener);
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}
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if (!(mNetworkListenerEnabled && mPassiveListenerEnabled)) {
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mLastUpdateInterval *= 1.5;
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if (mLastUpdateInterval == 0) {
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mLastUpdateInterval = LOCATION_UPDATE_ENABLE_INTERVAL_MIN;
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} else if (mLastUpdateInterval > LOCATION_UPDATE_ENABLE_INTERVAL_MAX) {
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mLastUpdateInterval = LOCATION_UPDATE_ENABLE_INTERVAL_MAX;
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}
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sendEmptyMessageDelayed(MSG_ENABLE_LOCATION_UPDATES, mLastUpdateInterval);
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}
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break;
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case MSG_DO_TWILIGHT_UPDATE:
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updateTwilightState();
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break;
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}
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}
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private void retrieveLocation() {
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Location location = null;
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final Iterator<String> providers =
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mLocationManager.getProviders(new Criteria(), true).iterator();
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while (providers.hasNext()) {
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final Location lastKnownLocation =
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mLocationManager.getLastKnownLocation(providers.next());
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// pick the most recent location
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if (location == null || (lastKnownLocation != null &&
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location.getElapsedRealtimeNano() <
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lastKnownLocation.getElapsedRealtimeNano())) {
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location = lastKnownLocation;
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}
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}
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// In the case there is no location available (e.g. GPS fix or network location
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// is not available yet), the longitude of the location is estimated using the timezone,
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// latitude and accuracy are set to get a good average.
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if (location == null) {
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Time currentTime = new Time();
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currentTime.set(System.currentTimeMillis());
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double lngOffset = FACTOR_GMT_OFFSET_LONGITUDE *
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(currentTime.gmtoff - (currentTime.isDst > 0 ? 3600 : 0));
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location = new Location("fake");
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location.setLongitude(lngOffset);
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location.setLatitude(0);
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location.setAccuracy(417000.0f);
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location.setTime(System.currentTimeMillis());
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location.setElapsedRealtimeNano(SystemClock.elapsedRealtimeNano());
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if (DEBUG) {
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Slog.d(TAG, "Estimated location from timezone: " + location);
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}
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}
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setLocation(location);
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}
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private void setLocation(Location location) {
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mLocation = location;
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updateTwilightState();
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}
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private void updateTwilightState() {
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final long now = System.currentTimeMillis();
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// calculate yesterday's twilight
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mTwilightCalculator.calculateTwilight(now - DateUtils.DAY_IN_MILLIS,
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mLocation.getLatitude(), mLocation.getLongitude());
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final long yesterdaySunset = mTwilightCalculator.mSunset;
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// calculate today's twilight
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mTwilightCalculator.calculateTwilight(now,
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mLocation.getLatitude(), mLocation.getLongitude());
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final boolean isNight = (mTwilightCalculator.mState == TwilightCalculator.NIGHT);
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final long todaySunrise = mTwilightCalculator.mSunrise;
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final long todaySunset = mTwilightCalculator.mSunset;
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// calculate tomorrow's twilight
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mTwilightCalculator.calculateTwilight(now + DateUtils.DAY_IN_MILLIS,
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mLocation.getLatitude(), mLocation.getLongitude());
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final long tomorrowSunrise = mTwilightCalculator.mSunrise;
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// set twilight state
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TwilightState state = new TwilightState(isNight, yesterdaySunset,
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todaySunrise, todaySunset, tomorrowSunrise);
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if (DEBUG) {
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Slog.d(TAG, "Updating twilight state: " + state);
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}
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setTwilightState(state);
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// schedule next update
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long nextUpdate = 0;
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if (todaySunrise == -1 || todaySunset == -1) {
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// In the case the day or night never ends the update is scheduled 12 hours later.
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nextUpdate = now + 12 * DateUtils.HOUR_IN_MILLIS;
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} else {
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// add some extra time to be on the safe side.
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nextUpdate += DateUtils.MINUTE_IN_MILLIS;
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if (now > todaySunset) {
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nextUpdate += tomorrowSunrise;
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} else if (now > todaySunrise) {
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nextUpdate += todaySunset;
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} else {
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nextUpdate += todaySunrise;
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}
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}
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if (DEBUG) {
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Slog.d(TAG, "Next update in " + (nextUpdate - now) + " ms");
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}
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Intent updateIntent = new Intent(ACTION_UPDATE_TWILIGHT_STATE);
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PendingIntent pendingIntent = PendingIntent.getBroadcast(mContext, 0, updateIntent, 0);
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mAlarmManager.cancel(pendingIntent);
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mAlarmManager.set(AlarmManager.RTC_WAKEUP, nextUpdate, pendingIntent);
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}
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};
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private final BroadcastReceiver mUpdateLocationReceiver = new BroadcastReceiver() {
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@Override
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public void onReceive(Context context, Intent intent) {
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if (Intent.ACTION_AIRPLANE_MODE_CHANGED.equals(intent.getAction())
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&& !intent.getBooleanExtra("state", false)) {
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// Airplane mode is now off!
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mLocationHandler.requestLocationUpdate();
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return;
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}
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// Time zone has changed or alarm expired.
|
|
mLocationHandler.requestTwilightUpdate();
|
|
}
|
|
};
|
|
|
|
// A LocationListener to initialize the network location provider. The location updates
|
|
// are handled through the passive location provider.
|
|
private final LocationListener mEmptyLocationListener = new LocationListener() {
|
|
public void onLocationChanged(Location location) {
|
|
}
|
|
|
|
public void onProviderDisabled(String provider) {
|
|
}
|
|
|
|
public void onProviderEnabled(String provider) {
|
|
}
|
|
|
|
public void onStatusChanged(String provider, int status, Bundle extras) {
|
|
}
|
|
};
|
|
|
|
private final LocationListener mLocationListener = new LocationListener() {
|
|
public void onLocationChanged(Location location) {
|
|
mLocationHandler.processNewLocation(location);
|
|
}
|
|
|
|
public void onProviderDisabled(String provider) {
|
|
}
|
|
|
|
public void onProviderEnabled(String provider) {
|
|
}
|
|
|
|
public void onStatusChanged(String provider, int status, Bundle extras) {
|
|
}
|
|
};
|
|
}
|