ef2ea1faf6
Cherry-picked from klp-modular-dev Provide an abstract class for system services to extend from, similar to the android.app.Service. This will allow services to receive events in a uniform way, and will allow services to be created and started in the correct order regardless of whether or not a particular service exists. Similar to android.app.Service, services are meant to implement Binder interfaces as inner classes. This prevents services from having incestuous access to each other and makes them use the public API. Change-Id: Iaacfee8d5f080a28d7cc606761f4624673ed390f
468 lines
18 KiB
Java
468 lines
18 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.twilight;
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import com.android.server.SystemService;
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import com.android.server.TwilightCalculator;
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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.util.ArrayList;
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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 extends SystemService {
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static final String TAG = "TwilightService";
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static final boolean DEBUG = false;
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static final String ACTION_UPDATE_TWILIGHT_STATE =
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"com.android.server.action.UPDATE_TWILIGHT_STATE";
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final Object mLock = new Object();
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AlarmManager mAlarmManager;
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LocationManager mLocationManager;
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LocationHandler mLocationHandler;
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final ArrayList<TwilightListenerRecord> mListeners =
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new ArrayList<TwilightListenerRecord>();
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TwilightState mTwilightState;
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@Override
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public void onStart() {
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mAlarmManager = (AlarmManager) getContext().getSystemService(Context.ALARM_SERVICE);
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mLocationManager = (LocationManager) getContext().getSystemService(
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Context.LOCATION_SERVICE);
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mLocationHandler = new LocationHandler();
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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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getContext().registerReceiver(mUpdateLocationReceiver, filter);
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publishLocalService(TwilightManager.class, mService);
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}
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private static 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 postUpdate() {
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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 TwilightManager mService = new TwilightManager() {
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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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@Override
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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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*/
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@Override
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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 (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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};
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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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final int listenerLen = mListeners.size();
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for (int i = 0; i < listenerLen; i++) {
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mListeners.get(i).postUpdate();
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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.getElapsedRealtimeNanos() < from.getElapsedRealtimeNanos()) {
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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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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.getElapsedRealtimeNanos() <
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lastKnownLocation.getElapsedRealtimeNanos())) {
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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.setElapsedRealtimeNanos(SystemClock.elapsedRealtimeNanos());
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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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if (mLocation == null) {
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setTwilightState(null);
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return;
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}
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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(
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getContext(), 0, updateIntent, 0);
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mAlarmManager.cancel(pendingIntent);
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mAlarmManager.setExact(AlarmManager.RTC, 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.
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mLocationHandler.requestTwilightUpdate();
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}
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};
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// A LocationListener to initialize the network location provider. The location updates
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// are handled through the passive location provider.
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private final LocationListener mEmptyLocationListener = new LocationListener() {
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public void onLocationChanged(Location location) {
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}
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public void onProviderDisabled(String provider) {
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}
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public void onProviderEnabled(String provider) {
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}
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public void onStatusChanged(String provider, int status, Bundle extras) {
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}
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};
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private final LocationListener mLocationListener = new LocationListener() {
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public void onLocationChanged(Location location) {
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mLocationHandler.processNewLocation(location);
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}
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public void onProviderDisabled(String provider) {
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}
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public void onProviderEnabled(String provider) {
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}
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public void onStatusChanged(String provider, int status, Bundle extras) {
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}
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};
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}
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