gecko/embedding/android/GeckoBatteryManager.java

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/* -*- Mode: Java; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: nil; -*-
2012-05-21 04:12:37 -07:00
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.gecko;
import java.lang.Math;
import java.util.Date;
import android.util.Log;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.BatteryManager;
public class GeckoBatteryManager
extends BroadcastReceiver
{
// Those constants should be keep in sync with the ones in:
// dom/battery/Constants.h
private final static double kDefaultLevel = 1.0;
private final static boolean kDefaultCharging = true;
private final static double kDefaultRemainingTime = -1.0;
private final static double kUnknownRemainingTime = -1.0;
private static Date sLastLevelChange = new Date(0);
private static boolean sNotificationsEnabled = false;
private static double sLevel = kDefaultLevel;
private static boolean sCharging = kDefaultCharging;
private static double sRemainingTime = kDefaultRemainingTime;;
@Override
public void onReceive(Context context, Intent intent) {
if (!intent.getAction().equals(Intent.ACTION_BATTERY_CHANGED)) {
Log.e("GeckoBatteryManager", "Got an unexpected intent!");
return;
}
boolean previousCharging = isCharging();
double previousLevel = getLevel();
if (intent.getBooleanExtra(BatteryManager.EXTRA_PRESENT, false)) {
int plugged = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
if (plugged == -1) {
sCharging = kDefaultCharging;
Log.e("GeckoBatteryManager", "Failed to get the plugged status!");
} else {
// Likely, if plugged > 0, it's likely plugged and charging but the doc
// isn't clear about that.
sCharging = plugged != 0;
}
if (sCharging != previousCharging) {
sRemainingTime = kUnknownRemainingTime;
// The new remaining time is going to take some time to show up but
// it's the best way to show a not too wrong value.
sLastLevelChange = new Date(0);
}
// We need two doubles because sLevel is a double.
double current = (double)intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
double max = (double)intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
if (current == -1 || max == -1) {
Log.e("GeckoBatteryManager", "Failed to get battery level!");
sLevel = kDefaultLevel;
} else {
sLevel = current / max;
}
if (sLevel == 1.0 && sCharging) {
sRemainingTime = 0.0;
} else if (sLevel != previousLevel) {
// Estimate remaining time.
if (sLastLevelChange.getTime() != 0) {
Date currentTime = new Date();
long dt = (currentTime.getTime() - sLastLevelChange.getTime()) / 1000;
double dLevel = sLevel - previousLevel;
if (sCharging) {
if (dLevel < 0) {
Log.w("GeckoBatteryManager", "When charging, level should increase!");
sRemainingTime = kUnknownRemainingTime;
} else {
sRemainingTime = Math.round(dt / dLevel * (1.0 - sLevel));
}
} else {
if (dLevel > 0) {
Log.w("GeckoBatteryManager", "When discharging, level should decrease!");
sRemainingTime = kUnknownRemainingTime;
} else {
sRemainingTime = Math.round(dt / -dLevel * sLevel);
}
}
sLastLevelChange = currentTime;
} else {
// That's the first time we got an update, we can't do anything.
sLastLevelChange = new Date();
}
}
} else {
sLevel = kDefaultLevel;
sCharging = kDefaultCharging;
sRemainingTime = kDefaultRemainingTime;
}
/*
* We want to inform listeners if the following conditions are fulfilled:
* - we have at least one observer;
* - the charging state or the level has changed.
*
* Note: no need to check for a remaining time change given that it's only
* updated if there is a level change or a charging change.
*
* The idea is to prevent doing all the way to the DOM code in the child
* process to finally not send an event.
*/
if (sNotificationsEnabled &&
(previousCharging != isCharging() || previousLevel != getLevel())) {
GeckoAppShell.notifyBatteryChange(getLevel(), isCharging(), getRemainingTime());
}
}
public static boolean isCharging() {
return sCharging;
}
public static double getLevel() {
return sLevel;
}
public static double getRemainingTime() {
return sRemainingTime;
}
public static void enableNotifications() {
sNotificationsEnabled = true;
}
public static void disableNotifications() {
sNotificationsEnabled = false;
}
public static double[] getCurrentInformation() {
return new double[] { getLevel(), isCharging() ? 1.0 : 0.0, getRemainingTime() };
}
}