| /* |
| * Copyright 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.server.display; |
| |
| import android.annotation.Nullable; |
| import android.app.ActivityManager; |
| import android.content.BroadcastReceiver; |
| import android.content.ContentResolver; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.IntentFilter; |
| import android.content.pm.ParceledListSlice; |
| import android.database.ContentObserver; |
| import android.hardware.Sensor; |
| import android.hardware.SensorEvent; |
| import android.hardware.SensorEventListener; |
| import android.hardware.SensorManager; |
| import android.hardware.display.BrightnessChangeEvent; |
| import android.net.Uri; |
| import android.os.BatteryManager; |
| import android.os.Environment; |
| import android.os.Handler; |
| import android.os.RemoteException; |
| import android.os.SystemClock; |
| import android.os.UserHandle; |
| import android.os.UserManager; |
| import android.provider.Settings; |
| import android.util.AtomicFile; |
| import android.util.Slog; |
| import android.util.Xml; |
| |
| import com.android.internal.annotations.GuardedBy; |
| import com.android.internal.annotations.VisibleForTesting; |
| import com.android.internal.os.BackgroundThread; |
| import com.android.internal.util.FastXmlSerializer; |
| import com.android.internal.util.RingBuffer; |
| |
| import libcore.io.IoUtils; |
| |
| import org.xmlpull.v1.XmlPullParser; |
| import org.xmlpull.v1.XmlPullParserException; |
| import org.xmlpull.v1.XmlSerializer; |
| |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.nio.charset.StandardCharsets; |
| import java.util.ArrayDeque; |
| import java.util.ArrayList; |
| |
| import java.util.Deque; |
| import java.util.List; |
| import java.util.concurrent.TimeUnit; |
| |
| /** |
| * Class that tracks recent brightness settings changes and stores |
| * associated information such as light sensor readings. |
| */ |
| public class BrightnessTracker { |
| |
| private static final String TAG = "BrightnessTracker"; |
| private static final boolean DEBUG = false; |
| |
| private static final String EVENTS_FILE = "brightness_events.xml"; |
| private static final int MAX_EVENTS = 100; |
| // Discard events when reading or writing that are older than this. |
| private static final long MAX_EVENT_AGE = TimeUnit.DAYS.toMillis(30); |
| // Time over which we keep lux sensor readings. |
| private static final long LUX_EVENT_HORIZON = TimeUnit.SECONDS.toNanos(10); |
| |
| private static final String TAG_EVENTS = "events"; |
| private static final String TAG_EVENT = "event"; |
| private static final String ATTR_BRIGHTNESS = "brightness"; |
| private static final String ATTR_TIMESTAMP = "timestamp"; |
| private static final String ATTR_PACKAGE_NAME = "packageName"; |
| private static final String ATTR_USER = "user"; |
| private static final String ATTR_LUX = "lux"; |
| private static final String ATTR_LUX_TIMESTAMPS = "luxTimestamps"; |
| private static final String ATTR_BATTERY_LEVEL = "batteryLevel"; |
| private static final String ATTR_NIGHT_MODE = "nightMode"; |
| private static final String ATTR_COLOR_TEMPERATURE = "colorTemperature"; |
| private static final String ATTR_LAST_BRIGHTNESS = "lastBrightness"; |
| |
| // Lock held while accessing mEvents, is held while writing events to flash. |
| private final Object mEventsLock = new Object(); |
| @GuardedBy("mEventsLock") |
| private RingBuffer<BrightnessChangeEvent> mEvents |
| = new RingBuffer<>(BrightnessChangeEvent.class, MAX_EVENTS); |
| private final Runnable mEventsWriter = () -> writeEvents(); |
| private volatile boolean mWriteEventsScheduled; |
| |
| private UserManager mUserManager; |
| private final Context mContext; |
| private final ContentResolver mContentResolver; |
| private Handler mBgHandler; |
| // mSettingsObserver, mBroadcastReceiver and mSensorListener should only be used on |
| // the mBgHandler thread. |
| private SettingsObserver mSettingsObserver; |
| private BroadcastReceiver mBroadcastReceiver; |
| private SensorListener mSensorListener; |
| |
| // Lock held while collecting data related to brightness changes. |
| private final Object mDataCollectionLock = new Object(); |
| @GuardedBy("mDataCollectionLock") |
| private Deque<LightData> mLastSensorReadings = new ArrayDeque<>(); |
| @GuardedBy("mDataCollectionLock") |
| private float mLastBatteryLevel = Float.NaN; |
| @GuardedBy("mDataCollectionLock") |
| private int mIgnoreBrightness = -1; |
| @GuardedBy("mDataCollectionLock") |
| private int mLastBrightness = -1; |
| |
| private final Injector mInjector; |
| |
| public BrightnessTracker(Context context, @Nullable Injector injector) { |
| // Note this will be called very early in boot, other system |
| // services may not be present. |
| mContext = context; |
| mContentResolver = context.getContentResolver(); |
| if (injector != null) { |
| mInjector = injector; |
| } else { |
| mInjector = new Injector(); |
| } |
| } |
| |
| /** Start listening for brightness slider events */ |
| public void start() { |
| if (DEBUG) { |
| Slog.d(TAG, "Start"); |
| } |
| mBgHandler = mInjector.getBackgroundHandler(); |
| mUserManager = mContext.getSystemService(UserManager.class); |
| |
| mBgHandler.post(() -> backgroundStart()); |
| } |
| |
| private void backgroundStart() { |
| readEvents(); |
| |
| mLastBrightness = mInjector.getSystemIntForUser(mContentResolver, |
| Settings.System.SCREEN_BRIGHTNESS, -1, |
| UserHandle.USER_CURRENT); |
| |
| mSensorListener = new SensorListener(); |
| mInjector.registerSensorListener(mContext, mSensorListener); |
| |
| mSettingsObserver = new SettingsObserver(mBgHandler); |
| mInjector.registerBrightnessObserver(mContentResolver, mSettingsObserver); |
| |
| final IntentFilter intentFilter = new IntentFilter(); |
| intentFilter.addAction(Intent.ACTION_SHUTDOWN); |
| intentFilter.addAction(Intent.ACTION_BATTERY_CHANGED); |
| mBroadcastReceiver = new Receiver(); |
| mInjector.registerReceiver(mContext, mBroadcastReceiver, intentFilter); |
| } |
| |
| /** Stop listening for events */ |
| @VisibleForTesting |
| void stop() { |
| if (DEBUG) { |
| Slog.d(TAG, "Stop"); |
| } |
| mInjector.unregisterSensorListener(mContext, mSensorListener); |
| mInjector.unregisterReceiver(mContext, mBroadcastReceiver); |
| mInjector.unregisterBrightnessObserver(mContext, mSettingsObserver); |
| } |
| |
| /** |
| * @param userId userId to fetch data for. |
| * @return List of recent {@link BrightnessChangeEvent}s |
| */ |
| public ParceledListSlice<BrightnessChangeEvent> getEvents(int userId) { |
| // TODO include apps from any managed profiles in the brightness information. |
| BrightnessChangeEvent[] events; |
| synchronized (mEventsLock) { |
| events = mEvents.toArray(); |
| } |
| ArrayList<BrightnessChangeEvent> out = new ArrayList<>(events.length); |
| for (int i = 0; i < events.length; ++i) { |
| if (events[i].userId == userId) { |
| out.add(events[i]); |
| } |
| } |
| return new ParceledListSlice<>(out); |
| } |
| |
| /** Sets brightness without logging the brightness change event */ |
| public void setBrightness(int brightness, int userId) { |
| synchronized (mDataCollectionLock) { |
| mIgnoreBrightness = brightness; |
| } |
| mInjector.putSystemIntForUser(mContentResolver, Settings.System.SCREEN_BRIGHTNESS, |
| brightness, userId); |
| } |
| |
| private void handleBrightnessChanged() { |
| if (DEBUG) { |
| Slog.d(TAG, "Brightness change"); |
| } |
| final BrightnessChangeEvent event = new BrightnessChangeEvent(); |
| event.timeStamp = mInjector.currentTimeMillis(); |
| |
| int brightness = mInjector.getSystemIntForUser(mContentResolver, |
| Settings.System.SCREEN_BRIGHTNESS, -1, |
| UserHandle.USER_CURRENT); |
| |
| synchronized (mDataCollectionLock) { |
| int previousBrightness = mLastBrightness; |
| mLastBrightness = brightness; |
| |
| if (brightness == -1 || brightness == mIgnoreBrightness) { |
| // Notified of brightness change but no setting or self change so ignore. |
| mIgnoreBrightness = -1; |
| return; |
| } |
| |
| final int readingCount = mLastSensorReadings.size(); |
| if (readingCount == 0) { |
| // No sensor data so ignore this. |
| return; |
| } |
| |
| event.luxValues = new float[readingCount]; |
| event.luxTimestamps = new long[readingCount]; |
| |
| int pos = 0; |
| |
| // Convert sensor timestamp in elapsed time nanos to current time millis. |
| long currentTimeMillis = mInjector.currentTimeMillis(); |
| long elapsedTimeNanos = mInjector.elapsedRealtimeNanos(); |
| for (LightData reading : mLastSensorReadings) { |
| event.luxValues[pos] = reading.lux; |
| event.luxTimestamps[pos] = currentTimeMillis - |
| TimeUnit.NANOSECONDS.toMillis(elapsedTimeNanos - reading.timestamp); |
| ++pos; |
| } |
| |
| event.batteryLevel = mLastBatteryLevel; |
| event.lastBrightness = previousBrightness; |
| } |
| |
| event.brightness = brightness; |
| |
| try { |
| final ActivityManager.StackInfo focusedStack = mInjector.getFocusedStack(); |
| event.userId = focusedStack.userId; |
| event.packageName = focusedStack.topActivity.getPackageName(); |
| } catch (RemoteException e) { |
| // Really shouldn't be possible. |
| } |
| |
| event.nightMode = mInjector.getSecureIntForUser(mContentResolver, |
| Settings.Secure.NIGHT_DISPLAY_ACTIVATED, 0, UserHandle.USER_CURRENT) |
| == 1; |
| event.colorTemperature = mInjector.getSecureIntForUser(mContentResolver, |
| Settings.Secure.NIGHT_DISPLAY_COLOR_TEMPERATURE, |
| 0, UserHandle.USER_CURRENT); |
| |
| if (DEBUG) { |
| Slog.d(TAG, "Event " + event.brightness + " " + event.packageName); |
| } |
| synchronized (mEventsLock) { |
| mEvents.append(event); |
| } |
| } |
| |
| private void scheduleWriteEvents() { |
| if (!mWriteEventsScheduled) { |
| mBgHandler.post(mEventsWriter); |
| mWriteEventsScheduled = true; |
| } |
| } |
| |
| private void writeEvents() { |
| mWriteEventsScheduled = false; |
| // TODO kick off write on handler thread e.g. every 24 hours. |
| synchronized (mEventsLock) { |
| final AtomicFile writeTo = mInjector.getFile(); |
| if (writeTo == null) { |
| return; |
| } |
| if (mEvents.isEmpty()) { |
| if (writeTo.exists()) { |
| writeTo.delete(); |
| } |
| } else { |
| FileOutputStream output = null; |
| try { |
| output = writeTo.startWrite(); |
| writeEventsLocked(output); |
| writeTo.finishWrite(output); |
| } catch (IOException e) { |
| writeTo.failWrite(output); |
| Slog.e(TAG, "Failed to write change mEvents.", e); |
| } |
| } |
| } |
| } |
| |
| private void readEvents() { |
| synchronized (mEventsLock) { |
| mEvents.clear(); |
| final AtomicFile readFrom = mInjector.getFile(); |
| if (readFrom != null && readFrom.exists()) { |
| FileInputStream input = null; |
| try { |
| input = readFrom.openRead(); |
| readEventsLocked(input); |
| } catch (IOException e) { |
| readFrom.delete(); |
| Slog.e(TAG, "Failed to read change mEvents.", e); |
| } finally { |
| IoUtils.closeQuietly(input); |
| } |
| } |
| } |
| } |
| |
| @VisibleForTesting |
| @GuardedBy("mEventsLock") |
| void writeEventsLocked(OutputStream stream) throws IOException { |
| XmlSerializer out = new FastXmlSerializer(); |
| out.setOutput(stream, StandardCharsets.UTF_8.name()); |
| out.startDocument(null, true); |
| out.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); |
| |
| out.startTag(null, TAG_EVENTS); |
| BrightnessChangeEvent[] toWrite = mEvents.toArray(); |
| if (DEBUG) { |
| Slog.d(TAG, "Writing events " + toWrite.length); |
| } |
| final long timeCutOff = System.currentTimeMillis() - MAX_EVENT_AGE; |
| for (int i = 0; i < toWrite.length; ++i) { |
| int userSerialNo = mInjector.getUserSerialNumber(mUserManager, toWrite[i].userId); |
| if (userSerialNo != -1 && toWrite[i].timeStamp > timeCutOff) { |
| out.startTag(null, TAG_EVENT); |
| out.attribute(null, ATTR_BRIGHTNESS, Integer.toString(toWrite[i].brightness)); |
| out.attribute(null, ATTR_TIMESTAMP, Long.toString(toWrite[i].timeStamp)); |
| out.attribute(null, ATTR_PACKAGE_NAME, toWrite[i].packageName); |
| out.attribute(null, ATTR_USER, Integer.toString(userSerialNo)); |
| out.attribute(null, ATTR_BATTERY_LEVEL, Float.toString(toWrite[i].batteryLevel)); |
| out.attribute(null, ATTR_NIGHT_MODE, Boolean.toString(toWrite[i].nightMode)); |
| out.attribute(null, ATTR_COLOR_TEMPERATURE, Integer.toString( |
| toWrite[i].colorTemperature)); |
| out.attribute(null, ATTR_LAST_BRIGHTNESS, |
| Integer.toString(toWrite[i].lastBrightness)); |
| StringBuilder luxValues = new StringBuilder(); |
| StringBuilder luxTimestamps = new StringBuilder(); |
| for (int j = 0; j < toWrite[i].luxValues.length; ++j) { |
| if (j > 0) { |
| luxValues.append(','); |
| luxTimestamps.append(','); |
| } |
| luxValues.append(Float.toString(toWrite[i].luxValues[j])); |
| luxTimestamps.append(Long.toString(toWrite[i].luxTimestamps[j])); |
| } |
| out.attribute(null, ATTR_LUX, luxValues.toString()); |
| out.attribute(null, ATTR_LUX_TIMESTAMPS, luxTimestamps.toString()); |
| out.endTag(null, TAG_EVENT); |
| } |
| } |
| out.endTag(null, TAG_EVENTS); |
| out.endDocument(); |
| stream.flush(); |
| } |
| |
| @VisibleForTesting |
| @GuardedBy("mEventsLock") |
| void readEventsLocked(InputStream stream) throws IOException { |
| try { |
| XmlPullParser parser = Xml.newPullParser(); |
| parser.setInput(stream, StandardCharsets.UTF_8.name()); |
| |
| int type; |
| while ((type = parser.next()) != XmlPullParser.END_DOCUMENT |
| && type != XmlPullParser.START_TAG) { |
| } |
| String tag = parser.getName(); |
| if (!TAG_EVENTS.equals(tag)) { |
| throw new XmlPullParserException( |
| "Events not found in brightness tracker file " + tag); |
| } |
| |
| final long timeCutOff = mInjector.currentTimeMillis() - MAX_EVENT_AGE; |
| |
| parser.next(); |
| int outerDepth = parser.getDepth(); |
| while ((type = parser.next()) != XmlPullParser.END_DOCUMENT |
| && (type != XmlPullParser.END_TAG || parser.getDepth() > outerDepth)) { |
| if (type == XmlPullParser.END_TAG || type == XmlPullParser.TEXT) { |
| continue; |
| } |
| tag = parser.getName(); |
| if (TAG_EVENT.equals(tag)) { |
| BrightnessChangeEvent event = new BrightnessChangeEvent(); |
| |
| String brightness = parser.getAttributeValue(null, ATTR_BRIGHTNESS); |
| event.brightness = Integer.parseInt(brightness); |
| String timestamp = parser.getAttributeValue(null, ATTR_TIMESTAMP); |
| event.timeStamp = Long.parseLong(timestamp); |
| event.packageName = parser.getAttributeValue(null, ATTR_PACKAGE_NAME); |
| String user = parser.getAttributeValue(null, ATTR_USER); |
| event.userId = mInjector.getUserId(mUserManager, Integer.parseInt(user)); |
| String batteryLevel = parser.getAttributeValue(null, ATTR_BATTERY_LEVEL); |
| event.batteryLevel = Float.parseFloat(batteryLevel); |
| String nightMode = parser.getAttributeValue(null, ATTR_NIGHT_MODE); |
| event.nightMode = Boolean.parseBoolean(nightMode); |
| String colorTemperature = |
| parser.getAttributeValue(null, ATTR_COLOR_TEMPERATURE); |
| event.colorTemperature = Integer.parseInt(colorTemperature); |
| String lastBrightness = parser.getAttributeValue(null, ATTR_LAST_BRIGHTNESS); |
| event.lastBrightness = Integer.parseInt(lastBrightness); |
| |
| String luxValue = parser.getAttributeValue(null, ATTR_LUX); |
| String luxTimestamp = parser.getAttributeValue(null, ATTR_LUX_TIMESTAMPS); |
| |
| String[] luxValues = luxValue.split(","); |
| String[] luxTimestamps = luxTimestamp.split(","); |
| if (luxValues.length != luxTimestamps.length) { |
| continue; |
| } |
| event.luxValues = new float[luxValues.length]; |
| event.luxTimestamps = new long[luxValues.length]; |
| for (int i = 0; i < luxValues.length; ++i) { |
| event.luxValues[i] = Float.parseFloat(luxValues[i]); |
| event.luxTimestamps[i] = Long.parseLong(luxTimestamps[i]); |
| } |
| |
| if (DEBUG) { |
| Slog.i(TAG, "Read event " + event.brightness |
| + " " + event.packageName); |
| } |
| |
| if (event.userId != -1 && event.timeStamp > timeCutOff |
| && event.luxValues.length > 0) { |
| mEvents.append(event); |
| } |
| } |
| } |
| } catch (NullPointerException | NumberFormatException | XmlPullParserException |
| | IOException e) { |
| // Failed to parse something, just start with an empty event log. |
| mEvents = new RingBuffer<>(BrightnessChangeEvent.class, MAX_EVENTS); |
| Slog.e(TAG, "Failed to parse brightness event", e); |
| // Re-throw so we will delete the bad file. |
| throw new IOException("failed to parse file", e); |
| } |
| } |
| |
| // Not allowed to keep the SensorEvent so used to copy the data we care about. |
| private static class LightData { |
| public float lux; |
| // Time in elapsedRealtimeNanos |
| public long timestamp; |
| } |
| |
| private void recordSensorEvent(SensorEvent event) { |
| long horizon = mInjector.elapsedRealtimeNanos() - LUX_EVENT_HORIZON; |
| synchronized (mDataCollectionLock) { |
| if (DEBUG) { |
| Slog.v(TAG, "Sensor event " + event); |
| } |
| if (!mLastSensorReadings.isEmpty() |
| && event.timestamp < mLastSensorReadings.getLast().timestamp) { |
| // Ignore event that came out of order. |
| return; |
| } |
| LightData data = null; |
| while (!mLastSensorReadings.isEmpty() |
| && mLastSensorReadings.getFirst().timestamp < horizon) { |
| // Remove data that has fallen out of the window. |
| data = mLastSensorReadings.removeFirst(); |
| } |
| // We put back the last one we removed so we know how long |
| // the first sensor reading was valid for. |
| if (data != null) { |
| mLastSensorReadings.addFirst(data); |
| } |
| |
| data = new LightData(); |
| data.timestamp = event.timestamp; |
| data.lux = event.values[0]; |
| mLastSensorReadings.addLast(data); |
| } |
| } |
| |
| private void batteryLevelChanged(int level, int scale) { |
| synchronized (mDataCollectionLock) { |
| mLastBatteryLevel = (float) level / (float) scale; |
| } |
| } |
| |
| private final class SensorListener implements SensorEventListener { |
| @Override |
| public void onSensorChanged(SensorEvent event) { |
| recordSensorEvent(event); |
| } |
| |
| @Override |
| public void onAccuracyChanged(Sensor sensor, int accuracy) { |
| |
| } |
| } |
| |
| private final class SettingsObserver extends ContentObserver { |
| public SettingsObserver(Handler handler) { |
| super(handler); |
| } |
| |
| @Override |
| public void onChange(boolean selfChange, Uri uri) { |
| if (DEBUG) { |
| Slog.v(TAG, "settings change " + uri); |
| } |
| // Self change is based on observer passed to notifyObserver, SettingsProvider |
| // passes null so no changes are self changes. |
| handleBrightnessChanged(); |
| } |
| } |
| |
| private final class Receiver extends BroadcastReceiver { |
| @Override |
| public void onReceive(Context context, Intent intent) { |
| if (DEBUG) { |
| Slog.d(TAG, "Received " + intent.getAction()); |
| } |
| String action = intent.getAction(); |
| if (Intent.ACTION_SHUTDOWN.equals(action)) { |
| stop(); |
| scheduleWriteEvents(); |
| } else if (Intent.ACTION_BATTERY_CHANGED.equals(action)) { |
| int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1); |
| int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, 0); |
| if (level != -1 && scale != 0) { |
| batteryLevelChanged(level, scale); |
| } |
| } |
| } |
| } |
| |
| @VisibleForTesting |
| static class Injector { |
| public void registerSensorListener(Context context, |
| SensorEventListener sensorListener) { |
| SensorManager sensorManager = context.getSystemService(SensorManager.class); |
| Sensor lightSensor = sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT); |
| sensorManager.registerListener(sensorListener, |
| lightSensor, SensorManager.SENSOR_DELAY_NORMAL); |
| } |
| |
| public void unregisterSensorListener(Context context, SensorEventListener sensorListener) { |
| SensorManager sensorManager = context.getSystemService(SensorManager.class); |
| sensorManager.unregisterListener(sensorListener); |
| } |
| |
| public void registerBrightnessObserver(ContentResolver resolver, |
| ContentObserver settingsObserver) { |
| resolver.registerContentObserver(Settings.System.getUriFor( |
| Settings.System.SCREEN_BRIGHTNESS), |
| false, settingsObserver, UserHandle.USER_ALL); |
| } |
| |
| public void unregisterBrightnessObserver(Context context, |
| ContentObserver settingsObserver) { |
| context.getContentResolver().unregisterContentObserver(settingsObserver); |
| } |
| |
| public void registerReceiver(Context context, |
| BroadcastReceiver receiver, IntentFilter filter) { |
| context.registerReceiver(receiver, filter); |
| } |
| |
| public void unregisterReceiver(Context context, |
| BroadcastReceiver receiver) { |
| context.unregisterReceiver(receiver); |
| } |
| |
| public Handler getBackgroundHandler() { |
| return BackgroundThread.getHandler(); |
| } |
| |
| public int getSystemIntForUser(ContentResolver resolver, String setting, int defaultValue, |
| int userId) { |
| return Settings.System.getIntForUser(resolver, setting, defaultValue, userId); |
| } |
| |
| public void putSystemIntForUser(ContentResolver resolver, String setting, int value, |
| int userId) { |
| Settings.System.putIntForUser(resolver, setting, value, userId); |
| } |
| |
| public int getSecureIntForUser(ContentResolver resolver, String setting, int defaultValue, |
| int userId) { |
| return Settings.Secure.getIntForUser(resolver, setting, defaultValue, userId); |
| } |
| |
| public AtomicFile getFile() { |
| return new AtomicFile(new File(Environment.getDataSystemDeDirectory(), EVENTS_FILE)); |
| } |
| |
| public long currentTimeMillis() { |
| return System.currentTimeMillis(); |
| } |
| |
| public long elapsedRealtimeNanos() { |
| return SystemClock.elapsedRealtimeNanos(); |
| } |
| |
| public int getUserSerialNumber(UserManager userManager, int userId) { |
| return userManager.getUserSerialNumber(userId); |
| } |
| |
| public int getUserId(UserManager userManager, int userSerialNumber) { |
| return userManager.getUserHandle(userSerialNumber); |
| } |
| |
| public ActivityManager.StackInfo getFocusedStack() throws RemoteException { |
| return ActivityManager.getService().getFocusedStackInfo(); |
| } |
| } |
| } |
