The Tor Browser: mobile/android/base/GeckoBatteryManager.java@6474c204b198 (annotated)

mobile/android/base/GeckoBatteryManager.java@6474c204b198 (annotated)

mobile/android/base/GeckoBatteryManager.java

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: Java; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: nil; -*-
  * 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 android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.os.BatteryManager;
 import android.os.Build;
 import android.os.SystemClock;
 import android.util.Log;
 public class GeckoBatteryManager extends BroadcastReceiver {
     private static final String LOGTAG = "GeckoBatteryManager";
     // 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 = 0.0;
     private final static double  kUnknownRemainingTime = -1.0;
     private static long    sLastLevelChange            = 0;
     private static boolean sNotificationsEnabled       = false;
     private static double  sLevel                      = kDefaultLevel;
     private static boolean sCharging                   = kDefaultCharging;
     private static double  sRemainingTime              = kDefaultRemainingTime;
     private static GeckoBatteryManager sInstance = new GeckoBatteryManager();
     private final IntentFilter mFilter;
     private Context mApplicationContext;
     private boolean mIsEnabled;
     public static GeckoBatteryManager getInstance() {
         return sInstance;
     }
     private GeckoBatteryManager() {
         mFilter = new IntentFilter();
         mFilter.addAction(Intent.ACTION_BATTERY_CHANGED);
     }
     public synchronized void start(final Context context) {
         if (mIsEnabled) {
             Log.w(LOGTAG, "Already started!");
             return;
         }
         mApplicationContext = context.getApplicationContext();
         // registerReceiver will return null if registering fails.
         if (mApplicationContext.registerReceiver(this, mFilter) == null) {
             Log.e(LOGTAG, "Registering receiver failed");
         } else {
             mIsEnabled = true;
         }
     }
     public synchronized void stop() {
         if (!mIsEnabled) {
             Log.w(LOGTAG, "Already stopped!");
             return;
         }
         mApplicationContext.unregisterReceiver(this);
         mApplicationContext = null;
         mIsEnabled = false;
     }
     @Override
     public void onReceive(Context context, Intent intent) {
         if (!intent.getAction().equals(Intent.ACTION_BATTERY_CHANGED)) {
             Log.e(LOGTAG, "Got an unexpected intent!");
             return;
         }
         boolean previousCharging = isCharging();
         double previousLevel = getLevel();
         // NOTE: it might not be common (in 2012) but technically, Android can run
         // on a device that has no battery so we want to make sure it's not the case
         // before bothering checking for battery state.
         // However, the Galaxy Nexus phone advertizes itself as battery-less which
         // force us to special-case the logic.
         // See the Google bug: https://code.google.com/p/android/issues/detail?id=22035
         if (intent.getBooleanExtra(BatteryManager.EXTRA_PRESENT, false) ||
                 Build.MODEL.equals("Galaxy Nexus")) {
             int plugged = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
             if (plugged == -1) {
                 sCharging = kDefaultCharging;
                 Log.e(LOGTAG, "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 = 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(LOGTAG, "Failed to get battery level!");
                 sLevel = kDefaultLevel;
             } else {
                 sLevel = current / max;
             }
             if (sLevel == 1.0 && sCharging) {
                 sRemainingTime = kDefaultRemainingTime;
             } else if (sLevel != previousLevel) {
                 // Estimate remaining time.
                 if (sLastLevelChange != 0) {
                     // Use elapsedRealtime() because we want to track time across device sleeps.
                     long currentTime = SystemClock.elapsedRealtime();
                     long dt = (currentTime - sLastLevelChange) / 1000;
                     double dLevel = sLevel - previousLevel;
                     if (sCharging) {
                         if (dLevel < 0) {
                             Log.w(LOGTAG, "When charging, level should increase!");
                             sRemainingTime = kUnknownRemainingTime;
                         } else {
                             sRemainingTime = Math.round(dt / dLevel * (1.0 - sLevel));
                         }
                     } else {
                         if (dLevel > 0) {
                             Log.w(LOGTAG, "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 = SystemClock.elapsedRealtime();
                 }
             }
         } 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() };
     }
 }

The Tor Browser / annotate

mobile/android/base/GeckoBatteryManager.java@6474c204b198 (annotated)

mobile/android/base/GeckoBatteryManager.java