Kenny Guy | 22bd044 | 2017-10-26 00:15:54 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2017 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.android.server.display; |
| 18 | |
| 19 | import android.annotation.Nullable; |
| 20 | import android.app.ActivityManager; |
| 21 | import android.content.BroadcastReceiver; |
| 22 | import android.content.ContentResolver; |
| 23 | import android.content.Context; |
| 24 | import android.content.Intent; |
| 25 | import android.content.IntentFilter; |
| 26 | import android.content.pm.ParceledListSlice; |
| 27 | import android.database.ContentObserver; |
| 28 | import android.hardware.Sensor; |
| 29 | import android.hardware.SensorEvent; |
| 30 | import android.hardware.SensorEventListener; |
| 31 | import android.hardware.SensorManager; |
| 32 | import android.hardware.display.BrightnessChangeEvent; |
| 33 | import android.net.Uri; |
| 34 | import android.os.BatteryManager; |
| 35 | import android.os.Environment; |
| 36 | import android.os.Handler; |
| 37 | import android.os.RemoteException; |
| 38 | import android.os.SystemClock; |
| 39 | import android.os.UserHandle; |
| 40 | import android.os.UserManager; |
| 41 | import android.provider.Settings; |
| 42 | import android.util.AtomicFile; |
| 43 | import android.util.Slog; |
| 44 | import android.util.Xml; |
| 45 | |
| 46 | import com.android.internal.annotations.GuardedBy; |
| 47 | import com.android.internal.annotations.VisibleForTesting; |
| 48 | import com.android.internal.os.BackgroundThread; |
| 49 | import com.android.internal.util.FastXmlSerializer; |
| 50 | import com.android.internal.util.RingBuffer; |
| 51 | |
| 52 | import libcore.io.IoUtils; |
| 53 | |
| 54 | import org.xmlpull.v1.XmlPullParser; |
| 55 | import org.xmlpull.v1.XmlPullParserException; |
| 56 | import org.xmlpull.v1.XmlSerializer; |
| 57 | |
| 58 | import java.io.File; |
| 59 | import java.io.FileInputStream; |
| 60 | import java.io.FileOutputStream; |
| 61 | import java.io.IOException; |
| 62 | import java.io.InputStream; |
| 63 | import java.io.OutputStream; |
| 64 | import java.nio.charset.StandardCharsets; |
| 65 | import java.util.ArrayDeque; |
| 66 | import java.util.ArrayList; |
| 67 | |
| 68 | import java.util.Deque; |
| 69 | import java.util.List; |
| 70 | import java.util.concurrent.TimeUnit; |
| 71 | |
| 72 | /** |
| 73 | * Class that tracks recent brightness settings changes and stores |
| 74 | * associated information such as light sensor readings. |
| 75 | */ |
| 76 | public class BrightnessTracker { |
| 77 | |
| 78 | private static final String TAG = "BrightnessTracker"; |
| 79 | private static final boolean DEBUG = false; |
| 80 | |
| 81 | private static final String EVENTS_FILE = "brightness_events.xml"; |
| 82 | private static final int MAX_EVENTS = 100; |
| 83 | // Discard events when reading or writing that are older than this. |
| 84 | private static final long MAX_EVENT_AGE = TimeUnit.DAYS.toMillis(30); |
| 85 | // Time over which we keep lux sensor readings. |
| 86 | private static final long LUX_EVENT_HORIZON = TimeUnit.SECONDS.toNanos(10); |
| 87 | |
| 88 | private static final String TAG_EVENTS = "events"; |
| 89 | private static final String TAG_EVENT = "event"; |
| 90 | private static final String ATTR_BRIGHTNESS = "brightness"; |
| 91 | private static final String ATTR_TIMESTAMP = "timestamp"; |
| 92 | private static final String ATTR_PACKAGE_NAME = "packageName"; |
| 93 | private static final String ATTR_USER = "user"; |
| 94 | private static final String ATTR_LUX = "lux"; |
| 95 | private static final String ATTR_LUX_TIMESTAMPS = "luxTimestamps"; |
| 96 | private static final String ATTR_BATTERY_LEVEL = "batteryLevel"; |
| 97 | private static final String ATTR_NIGHT_MODE = "nightMode"; |
| 98 | private static final String ATTR_COLOR_TEMPERATURE = "colorTemperature"; |
| 99 | private static final String ATTR_LAST_BRIGHTNESS = "lastBrightness"; |
| 100 | |
| 101 | // Lock held while accessing mEvents, is held while writing events to flash. |
| 102 | private final Object mEventsLock = new Object(); |
| 103 | @GuardedBy("mEventsLock") |
| 104 | private RingBuffer<BrightnessChangeEvent> mEvents |
| 105 | = new RingBuffer<>(BrightnessChangeEvent.class, MAX_EVENTS); |
| 106 | private final Runnable mEventsWriter = () -> writeEvents(); |
| 107 | private volatile boolean mWriteEventsScheduled; |
| 108 | |
| 109 | private UserManager mUserManager; |
| 110 | private final Context mContext; |
| 111 | private final ContentResolver mContentResolver; |
| 112 | private Handler mBgHandler; |
| 113 | // mSettingsObserver, mBroadcastReceiver and mSensorListener should only be used on |
| 114 | // the mBgHandler thread. |
| 115 | private SettingsObserver mSettingsObserver; |
| 116 | private BroadcastReceiver mBroadcastReceiver; |
| 117 | private SensorListener mSensorListener; |
| 118 | |
| 119 | // Lock held while collecting data related to brightness changes. |
| 120 | private final Object mDataCollectionLock = new Object(); |
| 121 | @GuardedBy("mDataCollectionLock") |
| 122 | private Deque<LightData> mLastSensorReadings = new ArrayDeque<>(); |
| 123 | @GuardedBy("mDataCollectionLock") |
| 124 | private float mLastBatteryLevel = Float.NaN; |
| 125 | @GuardedBy("mDataCollectionLock") |
| 126 | private int mIgnoreBrightness = -1; |
| 127 | @GuardedBy("mDataCollectionLock") |
| 128 | private int mLastBrightness = -1; |
| 129 | |
| 130 | private final Injector mInjector; |
| 131 | |
| 132 | public BrightnessTracker(Context context, @Nullable Injector injector) { |
| 133 | // Note this will be called very early in boot, other system |
| 134 | // services may not be present. |
| 135 | mContext = context; |
| 136 | mContentResolver = context.getContentResolver(); |
| 137 | if (injector != null) { |
| 138 | mInjector = injector; |
| 139 | } else { |
| 140 | mInjector = new Injector(); |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | /** Start listening for brightness slider events */ |
| 145 | public void start() { |
| 146 | if (DEBUG) { |
| 147 | Slog.d(TAG, "Start"); |
| 148 | } |
| 149 | mBgHandler = mInjector.getBackgroundHandler(); |
| 150 | mUserManager = mContext.getSystemService(UserManager.class); |
| 151 | |
| 152 | mBgHandler.post(() -> backgroundStart()); |
| 153 | } |
| 154 | |
| 155 | private void backgroundStart() { |
| 156 | readEvents(); |
| 157 | |
| 158 | mLastBrightness = mInjector.getSystemIntForUser(mContentResolver, |
| 159 | Settings.System.SCREEN_BRIGHTNESS, -1, |
| 160 | UserHandle.USER_CURRENT); |
| 161 | |
| 162 | mSensorListener = new SensorListener(); |
| 163 | mInjector.registerSensorListener(mContext, mSensorListener); |
| 164 | |
| 165 | mSettingsObserver = new SettingsObserver(mBgHandler); |
| 166 | mInjector.registerBrightnessObserver(mContentResolver, mSettingsObserver); |
| 167 | |
| 168 | final IntentFilter intentFilter = new IntentFilter(); |
| 169 | intentFilter.addAction(Intent.ACTION_SHUTDOWN); |
| 170 | intentFilter.addAction(Intent.ACTION_BATTERY_CHANGED); |
| 171 | mBroadcastReceiver = new Receiver(); |
| 172 | mInjector.registerReceiver(mContext, mBroadcastReceiver, intentFilter); |
| 173 | } |
| 174 | |
| 175 | /** Stop listening for events */ |
| 176 | @VisibleForTesting |
| 177 | void stop() { |
| 178 | if (DEBUG) { |
| 179 | Slog.d(TAG, "Stop"); |
| 180 | } |
| 181 | mInjector.unregisterSensorListener(mContext, mSensorListener); |
| 182 | mInjector.unregisterReceiver(mContext, mBroadcastReceiver); |
| 183 | mInjector.unregisterBrightnessObserver(mContext, mSettingsObserver); |
| 184 | } |
| 185 | |
| 186 | /** |
| 187 | * @param userId userId to fetch data for. |
| 188 | * @return List of recent {@link BrightnessChangeEvent}s |
| 189 | */ |
| 190 | public ParceledListSlice<BrightnessChangeEvent> getEvents(int userId) { |
| 191 | // TODO include apps from any managed profiles in the brightness information. |
| 192 | BrightnessChangeEvent[] events; |
| 193 | synchronized (mEventsLock) { |
| 194 | events = mEvents.toArray(); |
| 195 | } |
| 196 | ArrayList<BrightnessChangeEvent> out = new ArrayList<>(events.length); |
| 197 | for (int i = 0; i < events.length; ++i) { |
| 198 | if (events[i].userId == userId) { |
| 199 | out.add(events[i]); |
| 200 | } |
| 201 | } |
| 202 | return new ParceledListSlice<>(out); |
| 203 | } |
| 204 | |
| 205 | /** Sets brightness without logging the brightness change event */ |
| 206 | public void setBrightness(int brightness, int userId) { |
| 207 | synchronized (mDataCollectionLock) { |
| 208 | mIgnoreBrightness = brightness; |
| 209 | } |
| 210 | mInjector.putSystemIntForUser(mContentResolver, Settings.System.SCREEN_BRIGHTNESS, |
| 211 | brightness, userId); |
| 212 | } |
| 213 | |
| 214 | private void handleBrightnessChanged() { |
| 215 | if (DEBUG) { |
| 216 | Slog.d(TAG, "Brightness change"); |
| 217 | } |
| 218 | final BrightnessChangeEvent event = new BrightnessChangeEvent(); |
| 219 | event.timeStamp = mInjector.currentTimeMillis(); |
| 220 | |
| 221 | int brightness = mInjector.getSystemIntForUser(mContentResolver, |
| 222 | Settings.System.SCREEN_BRIGHTNESS, -1, |
| 223 | UserHandle.USER_CURRENT); |
| 224 | |
| 225 | synchronized (mDataCollectionLock) { |
| 226 | int previousBrightness = mLastBrightness; |
| 227 | mLastBrightness = brightness; |
| 228 | |
| 229 | if (brightness == -1 || brightness == mIgnoreBrightness) { |
| 230 | // Notified of brightness change but no setting or self change so ignore. |
| 231 | mIgnoreBrightness = -1; |
| 232 | return; |
| 233 | } |
| 234 | |
| 235 | final int readingCount = mLastSensorReadings.size(); |
| 236 | if (readingCount == 0) { |
| 237 | // No sensor data so ignore this. |
| 238 | return; |
| 239 | } |
| 240 | |
| 241 | event.luxValues = new float[readingCount]; |
| 242 | event.luxTimestamps = new long[readingCount]; |
| 243 | |
| 244 | int pos = 0; |
| 245 | |
| 246 | // Convert sensor timestamp in elapsed time nanos to current time millis. |
| 247 | long currentTimeMillis = mInjector.currentTimeMillis(); |
| 248 | long elapsedTimeNanos = mInjector.elapsedRealtimeNanos(); |
| 249 | for (LightData reading : mLastSensorReadings) { |
| 250 | event.luxValues[pos] = reading.lux; |
| 251 | event.luxTimestamps[pos] = currentTimeMillis - |
| 252 | TimeUnit.NANOSECONDS.toMillis(elapsedTimeNanos - reading.timestamp); |
| 253 | ++pos; |
| 254 | } |
| 255 | |
| 256 | event.batteryLevel = mLastBatteryLevel; |
| 257 | event.lastBrightness = previousBrightness; |
| 258 | } |
| 259 | |
| 260 | event.brightness = brightness; |
| 261 | |
| 262 | try { |
| 263 | final ActivityManager.StackInfo focusedStack = mInjector.getFocusedStack(); |
| 264 | event.userId = focusedStack.userId; |
| 265 | event.packageName = focusedStack.topActivity.getPackageName(); |
| 266 | } catch (RemoteException e) { |
| 267 | // Really shouldn't be possible. |
| 268 | } |
| 269 | |
| 270 | event.nightMode = mInjector.getSecureIntForUser(mContentResolver, |
| 271 | Settings.Secure.NIGHT_DISPLAY_ACTIVATED, 0, UserHandle.USER_CURRENT) |
| 272 | == 1; |
| 273 | event.colorTemperature = mInjector.getSecureIntForUser(mContentResolver, |
| 274 | Settings.Secure.NIGHT_DISPLAY_COLOR_TEMPERATURE, |
| 275 | 0, UserHandle.USER_CURRENT); |
| 276 | |
| 277 | if (DEBUG) { |
| 278 | Slog.d(TAG, "Event " + event.brightness + " " + event.packageName); |
| 279 | } |
| 280 | synchronized (mEventsLock) { |
| 281 | mEvents.append(event); |
| 282 | } |
| 283 | } |
| 284 | |
| 285 | private void scheduleWriteEvents() { |
| 286 | if (!mWriteEventsScheduled) { |
| 287 | mBgHandler.post(mEventsWriter); |
| 288 | mWriteEventsScheduled = true; |
| 289 | } |
| 290 | } |
| 291 | |
| 292 | private void writeEvents() { |
| 293 | mWriteEventsScheduled = false; |
| 294 | // TODO kick off write on handler thread e.g. every 24 hours. |
| 295 | synchronized (mEventsLock) { |
| 296 | final AtomicFile writeTo = mInjector.getFile(); |
| 297 | if (writeTo == null) { |
| 298 | return; |
| 299 | } |
| 300 | if (mEvents.isEmpty()) { |
| 301 | if (writeTo.exists()) { |
| 302 | writeTo.delete(); |
| 303 | } |
| 304 | } else { |
| 305 | FileOutputStream output = null; |
| 306 | try { |
| 307 | output = writeTo.startWrite(); |
| 308 | writeEventsLocked(output); |
| 309 | writeTo.finishWrite(output); |
| 310 | } catch (IOException e) { |
| 311 | writeTo.failWrite(output); |
| 312 | Slog.e(TAG, "Failed to write change mEvents.", e); |
| 313 | } |
| 314 | } |
| 315 | } |
| 316 | } |
| 317 | |
| 318 | private void readEvents() { |
| 319 | synchronized (mEventsLock) { |
| 320 | mEvents.clear(); |
| 321 | final AtomicFile readFrom = mInjector.getFile(); |
| 322 | if (readFrom != null && readFrom.exists()) { |
| 323 | FileInputStream input = null; |
| 324 | try { |
| 325 | input = readFrom.openRead(); |
| 326 | readEventsLocked(input); |
| 327 | } catch (IOException e) { |
| 328 | readFrom.delete(); |
| 329 | Slog.e(TAG, "Failed to read change mEvents.", e); |
| 330 | } finally { |
| 331 | IoUtils.closeQuietly(input); |
| 332 | } |
| 333 | } |
| 334 | } |
| 335 | } |
| 336 | |
| 337 | @VisibleForTesting |
| 338 | @GuardedBy("mEventsLock") |
| 339 | void writeEventsLocked(OutputStream stream) throws IOException { |
| 340 | XmlSerializer out = new FastXmlSerializer(); |
| 341 | out.setOutput(stream, StandardCharsets.UTF_8.name()); |
| 342 | out.startDocument(null, true); |
| 343 | out.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); |
| 344 | |
| 345 | out.startTag(null, TAG_EVENTS); |
| 346 | BrightnessChangeEvent[] toWrite = mEvents.toArray(); |
| 347 | if (DEBUG) { |
| 348 | Slog.d(TAG, "Writing events " + toWrite.length); |
| 349 | } |
| 350 | final long timeCutOff = System.currentTimeMillis() - MAX_EVENT_AGE; |
| 351 | for (int i = 0; i < toWrite.length; ++i) { |
| 352 | int userSerialNo = mInjector.getUserSerialNumber(mUserManager, toWrite[i].userId); |
| 353 | if (userSerialNo != -1 && toWrite[i].timeStamp > timeCutOff) { |
| 354 | out.startTag(null, TAG_EVENT); |
| 355 | out.attribute(null, ATTR_BRIGHTNESS, Integer.toString(toWrite[i].brightness)); |
| 356 | out.attribute(null, ATTR_TIMESTAMP, Long.toString(toWrite[i].timeStamp)); |
| 357 | out.attribute(null, ATTR_PACKAGE_NAME, toWrite[i].packageName); |
| 358 | out.attribute(null, ATTR_USER, Integer.toString(userSerialNo)); |
| 359 | out.attribute(null, ATTR_BATTERY_LEVEL, Float.toString(toWrite[i].batteryLevel)); |
| 360 | out.attribute(null, ATTR_NIGHT_MODE, Boolean.toString(toWrite[i].nightMode)); |
| 361 | out.attribute(null, ATTR_COLOR_TEMPERATURE, Integer.toString( |
| 362 | toWrite[i].colorTemperature)); |
| 363 | out.attribute(null, ATTR_LAST_BRIGHTNESS, |
| 364 | Integer.toString(toWrite[i].lastBrightness)); |
| 365 | StringBuilder luxValues = new StringBuilder(); |
| 366 | StringBuilder luxTimestamps = new StringBuilder(); |
| 367 | for (int j = 0; j < toWrite[i].luxValues.length; ++j) { |
| 368 | if (j > 0) { |
| 369 | luxValues.append(','); |
| 370 | luxTimestamps.append(','); |
| 371 | } |
| 372 | luxValues.append(Float.toString(toWrite[i].luxValues[j])); |
| 373 | luxTimestamps.append(Long.toString(toWrite[i].luxTimestamps[j])); |
| 374 | } |
| 375 | out.attribute(null, ATTR_LUX, luxValues.toString()); |
| 376 | out.attribute(null, ATTR_LUX_TIMESTAMPS, luxTimestamps.toString()); |
| 377 | out.endTag(null, TAG_EVENT); |
| 378 | } |
| 379 | } |
| 380 | out.endTag(null, TAG_EVENTS); |
| 381 | out.endDocument(); |
| 382 | stream.flush(); |
| 383 | } |
| 384 | |
| 385 | @VisibleForTesting |
| 386 | @GuardedBy("mEventsLock") |
| 387 | void readEventsLocked(InputStream stream) throws IOException { |
| 388 | try { |
| 389 | XmlPullParser parser = Xml.newPullParser(); |
| 390 | parser.setInput(stream, StandardCharsets.UTF_8.name()); |
| 391 | |
| 392 | int type; |
| 393 | while ((type = parser.next()) != XmlPullParser.END_DOCUMENT |
| 394 | && type != XmlPullParser.START_TAG) { |
| 395 | } |
| 396 | String tag = parser.getName(); |
| 397 | if (!TAG_EVENTS.equals(tag)) { |
| 398 | throw new XmlPullParserException( |
| 399 | "Events not found in brightness tracker file " + tag); |
| 400 | } |
| 401 | |
| 402 | final long timeCutOff = mInjector.currentTimeMillis() - MAX_EVENT_AGE; |
| 403 | |
| 404 | parser.next(); |
| 405 | int outerDepth = parser.getDepth(); |
| 406 | while ((type = parser.next()) != XmlPullParser.END_DOCUMENT |
| 407 | && (type != XmlPullParser.END_TAG || parser.getDepth() > outerDepth)) { |
| 408 | if (type == XmlPullParser.END_TAG || type == XmlPullParser.TEXT) { |
| 409 | continue; |
| 410 | } |
| 411 | tag = parser.getName(); |
| 412 | if (TAG_EVENT.equals(tag)) { |
| 413 | BrightnessChangeEvent event = new BrightnessChangeEvent(); |
| 414 | |
| 415 | String brightness = parser.getAttributeValue(null, ATTR_BRIGHTNESS); |
| 416 | event.brightness = Integer.parseInt(brightness); |
| 417 | String timestamp = parser.getAttributeValue(null, ATTR_TIMESTAMP); |
| 418 | event.timeStamp = Long.parseLong(timestamp); |
| 419 | event.packageName = parser.getAttributeValue(null, ATTR_PACKAGE_NAME); |
| 420 | String user = parser.getAttributeValue(null, ATTR_USER); |
| 421 | event.userId = mInjector.getUserId(mUserManager, Integer.parseInt(user)); |
| 422 | String batteryLevel = parser.getAttributeValue(null, ATTR_BATTERY_LEVEL); |
| 423 | event.batteryLevel = Float.parseFloat(batteryLevel); |
| 424 | String nightMode = parser.getAttributeValue(null, ATTR_NIGHT_MODE); |
| 425 | event.nightMode = Boolean.parseBoolean(nightMode); |
| 426 | String colorTemperature = |
| 427 | parser.getAttributeValue(null, ATTR_COLOR_TEMPERATURE); |
| 428 | event.colorTemperature = Integer.parseInt(colorTemperature); |
| 429 | String lastBrightness = parser.getAttributeValue(null, ATTR_LAST_BRIGHTNESS); |
| 430 | event.lastBrightness = Integer.parseInt(lastBrightness); |
| 431 | |
| 432 | String luxValue = parser.getAttributeValue(null, ATTR_LUX); |
| 433 | String luxTimestamp = parser.getAttributeValue(null, ATTR_LUX_TIMESTAMPS); |
| 434 | |
| 435 | String[] luxValues = luxValue.split(","); |
| 436 | String[] luxTimestamps = luxTimestamp.split(","); |
| 437 | if (luxValues.length != luxTimestamps.length) { |
| 438 | continue; |
| 439 | } |
| 440 | event.luxValues = new float[luxValues.length]; |
| 441 | event.luxTimestamps = new long[luxValues.length]; |
| 442 | for (int i = 0; i < luxValues.length; ++i) { |
| 443 | event.luxValues[i] = Float.parseFloat(luxValues[i]); |
| 444 | event.luxTimestamps[i] = Long.parseLong(luxTimestamps[i]); |
| 445 | } |
| 446 | |
| 447 | if (DEBUG) { |
| 448 | Slog.i(TAG, "Read event " + event.brightness |
| 449 | + " " + event.packageName); |
| 450 | } |
| 451 | |
| 452 | if (event.userId != -1 && event.timeStamp > timeCutOff |
| 453 | && event.luxValues.length > 0) { |
| 454 | mEvents.append(event); |
| 455 | } |
| 456 | } |
| 457 | } |
| 458 | } catch (NullPointerException | NumberFormatException | XmlPullParserException |
| 459 | | IOException e) { |
| 460 | // Failed to parse something, just start with an empty event log. |
| 461 | mEvents = new RingBuffer<>(BrightnessChangeEvent.class, MAX_EVENTS); |
| 462 | Slog.e(TAG, "Failed to parse brightness event", e); |
| 463 | // Re-throw so we will delete the bad file. |
| 464 | throw new IOException("failed to parse file", e); |
| 465 | } |
| 466 | } |
| 467 | |
| 468 | // Not allowed to keep the SensorEvent so used to copy the data we care about. |
| 469 | private static class LightData { |
| 470 | public float lux; |
| 471 | // Time in elapsedRealtimeNanos |
| 472 | public long timestamp; |
| 473 | } |
| 474 | |
| 475 | private void recordSensorEvent(SensorEvent event) { |
| 476 | long horizon = mInjector.elapsedRealtimeNanos() - LUX_EVENT_HORIZON; |
| 477 | synchronized (mDataCollectionLock) { |
| 478 | if (DEBUG) { |
| 479 | Slog.v(TAG, "Sensor event " + event); |
| 480 | } |
| 481 | if (!mLastSensorReadings.isEmpty() |
| 482 | && event.timestamp < mLastSensorReadings.getLast().timestamp) { |
| 483 | // Ignore event that came out of order. |
| 484 | return; |
| 485 | } |
| 486 | LightData data = null; |
| 487 | while (!mLastSensorReadings.isEmpty() |
| 488 | && mLastSensorReadings.getFirst().timestamp < horizon) { |
| 489 | // Remove data that has fallen out of the window. |
| 490 | data = mLastSensorReadings.removeFirst(); |
| 491 | } |
| 492 | // We put back the last one we removed so we know how long |
| 493 | // the first sensor reading was valid for. |
| 494 | if (data != null) { |
| 495 | mLastSensorReadings.addFirst(data); |
| 496 | } |
| 497 | |
| 498 | data = new LightData(); |
| 499 | data.timestamp = event.timestamp; |
| 500 | data.lux = event.values[0]; |
| 501 | mLastSensorReadings.addLast(data); |
| 502 | } |
| 503 | } |
| 504 | |
| 505 | private void batteryLevelChanged(int level, int scale) { |
| 506 | synchronized (mDataCollectionLock) { |
| 507 | mLastBatteryLevel = (float) level / (float) scale; |
| 508 | } |
| 509 | } |
| 510 | |
| 511 | private final class SensorListener implements SensorEventListener { |
| 512 | @Override |
| 513 | public void onSensorChanged(SensorEvent event) { |
| 514 | recordSensorEvent(event); |
| 515 | } |
| 516 | |
| 517 | @Override |
| 518 | public void onAccuracyChanged(Sensor sensor, int accuracy) { |
| 519 | |
| 520 | } |
| 521 | } |
| 522 | |
| 523 | private final class SettingsObserver extends ContentObserver { |
| 524 | public SettingsObserver(Handler handler) { |
| 525 | super(handler); |
| 526 | } |
| 527 | |
| 528 | @Override |
| 529 | public void onChange(boolean selfChange, Uri uri) { |
| 530 | if (DEBUG) { |
| 531 | Slog.v(TAG, "settings change " + uri); |
| 532 | } |
| 533 | // Self change is based on observer passed to notifyObserver, SettingsProvider |
| 534 | // passes null so no changes are self changes. |
| 535 | handleBrightnessChanged(); |
| 536 | } |
| 537 | } |
| 538 | |
| 539 | private final class Receiver extends BroadcastReceiver { |
| 540 | @Override |
| 541 | public void onReceive(Context context, Intent intent) { |
| 542 | if (DEBUG) { |
| 543 | Slog.d(TAG, "Received " + intent.getAction()); |
| 544 | } |
| 545 | String action = intent.getAction(); |
| 546 | if (Intent.ACTION_SHUTDOWN.equals(action)) { |
| 547 | stop(); |
| 548 | scheduleWriteEvents(); |
| 549 | } else if (Intent.ACTION_BATTERY_CHANGED.equals(action)) { |
| 550 | int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1); |
| 551 | int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, 0); |
| 552 | if (level != -1 && scale != 0) { |
| 553 | batteryLevelChanged(level, scale); |
| 554 | } |
| 555 | } |
| 556 | } |
| 557 | } |
| 558 | |
| 559 | @VisibleForTesting |
| 560 | static class Injector { |
| 561 | public void registerSensorListener(Context context, |
| 562 | SensorEventListener sensorListener) { |
| 563 | SensorManager sensorManager = context.getSystemService(SensorManager.class); |
| 564 | Sensor lightSensor = sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT); |
| 565 | sensorManager.registerListener(sensorListener, |
| 566 | lightSensor, SensorManager.SENSOR_DELAY_NORMAL); |
| 567 | } |
| 568 | |
| 569 | public void unregisterSensorListener(Context context, SensorEventListener sensorListener) { |
| 570 | SensorManager sensorManager = context.getSystemService(SensorManager.class); |
| 571 | sensorManager.unregisterListener(sensorListener); |
| 572 | } |
| 573 | |
| 574 | public void registerBrightnessObserver(ContentResolver resolver, |
| 575 | ContentObserver settingsObserver) { |
| 576 | resolver.registerContentObserver(Settings.System.getUriFor( |
| 577 | Settings.System.SCREEN_BRIGHTNESS), |
| 578 | false, settingsObserver, UserHandle.USER_ALL); |
| 579 | } |
| 580 | |
| 581 | public void unregisterBrightnessObserver(Context context, |
| 582 | ContentObserver settingsObserver) { |
| 583 | context.getContentResolver().unregisterContentObserver(settingsObserver); |
| 584 | } |
| 585 | |
| 586 | public void registerReceiver(Context context, |
| 587 | BroadcastReceiver receiver, IntentFilter filter) { |
| 588 | context.registerReceiver(receiver, filter); |
| 589 | } |
| 590 | |
| 591 | public void unregisterReceiver(Context context, |
| 592 | BroadcastReceiver receiver) { |
| 593 | context.unregisterReceiver(receiver); |
| 594 | } |
| 595 | |
| 596 | public Handler getBackgroundHandler() { |
| 597 | return BackgroundThread.getHandler(); |
| 598 | } |
| 599 | |
| 600 | public int getSystemIntForUser(ContentResolver resolver, String setting, int defaultValue, |
| 601 | int userId) { |
| 602 | return Settings.System.getIntForUser(resolver, setting, defaultValue, userId); |
| 603 | } |
| 604 | |
| 605 | public void putSystemIntForUser(ContentResolver resolver, String setting, int value, |
| 606 | int userId) { |
| 607 | Settings.System.putIntForUser(resolver, setting, value, userId); |
| 608 | } |
| 609 | |
| 610 | public int getSecureIntForUser(ContentResolver resolver, String setting, int defaultValue, |
| 611 | int userId) { |
| 612 | return Settings.Secure.getIntForUser(resolver, setting, defaultValue, userId); |
| 613 | } |
| 614 | |
| 615 | public AtomicFile getFile() { |
| 616 | return new AtomicFile(new File(Environment.getDataSystemDeDirectory(), EVENTS_FILE)); |
| 617 | } |
| 618 | |
| 619 | public long currentTimeMillis() { |
| 620 | return System.currentTimeMillis(); |
| 621 | } |
| 622 | |
| 623 | public long elapsedRealtimeNanos() { |
| 624 | return SystemClock.elapsedRealtimeNanos(); |
| 625 | } |
| 626 | |
| 627 | public int getUserSerialNumber(UserManager userManager, int userId) { |
| 628 | return userManager.getUserSerialNumber(userId); |
| 629 | } |
| 630 | |
| 631 | public int getUserId(UserManager userManager, int userSerialNumber) { |
| 632 | return userManager.getUserHandle(userSerialNumber); |
| 633 | } |
| 634 | |
| 635 | public ActivityManager.StackInfo getFocusedStack() throws RemoteException { |
| 636 | return ActivityManager.getService().getFocusedStackInfo(); |
| 637 | } |
| 638 | } |
| 639 | } |