Android BatteryStatsHelper深入理解(and5.1).doc

Android BatteryStatsHelper深入理解(and5.1)BatteryStatsHelper这个类主要是统计各个应用，多用户的每个用户，以及蓝牙，屏幕等耗电统计。一般使用BatteryStatsHelper这个类，先要new一个实例，然后再调用create函数：下面我们就先从create分析，两种create方法，其中sStatsXfer是静态的java view plain copypublic void create(BatteryStats stats) mPowerProfile = new PowerProfile(mContext); mStats = stats; public void create(Bundle icicle) if (icicle != null) mStats = sStatsXfer; mBatteryBroadcast = sBatteryBroadcastXfer; mBatteryInfo = IBatteryStats.Stub.asInterface( ServiceManager.getService(BatteryStats.SERVICE_NAME); mPowerProfile = new PowerProfile(mContext); mPowerProfile是从power_profile.xml读取的各个器件的电源消耗参数，文件如下：java view plain copy 0 100 200 90.5 2.5 1.25 130 100 30.5 72.5 135 5.3 30 3.5 2.4 624000 699563 799500 899438 999375 1099313 1199250 1299188 1399125 1499063 1599000 2.2 /各个cpu频段的功耗 54 63 72 80 90 100 109 115 121 127 135 2000 接下来说下refreshStats是用来更新电池最新状态的，statsType是指充电状态还是非充电状态，asUsers指的是userId（多用户）java view plain copypublic void refreshStats(int statsType, List asUsers) final int n = asUsers.size(); SparseArray users = new SparseArray(n); for (int i = 0; i n; +i) UserHandle userHandle = asUsers.get(i); users.put(userHandle.getIdentifier(), userHandle); refreshStats(statsType, users); /* * Refreshes the power usage list. */ public void refreshStats(int statsType, SparseArray asUsers) refreshStats(statsType, asUsers, SystemClock.elapsedRealtime() * 1000, SystemClock.uptimeMillis() * 1000); 接下来分析下refreshStats函数java view plain copypublic void refreshStats(int statsType, SparseArray asUsers, long rawRealtimeUs, long rawUptimeUs) / Initialize mStats if necessary. getStats(); mMaxPower = 0; mMaxRealPower = 0; mComputedPower = 0; mTotalPower = 0; mWifiPower = 0; mBluetoothPower = 0; mAppMobileActive = 0; mAppWifiRunning = 0; mUsageList.clear(); mWifiSippers.clear(); mBluetoothSippers.clear(); mUserSippers.clear(); mUserPower.clear(); mMobilemsppList.clear(); if (mStats = null) return; mStatsType = statsType; mRawUptime = rawUptimeUs; mRawRealtime = rawRealtimeUs; mBatteryUptime = mStats.getBatteryUptime(rawUptimeUs); mBatteryRealtime = mStats.getBatteryRealtime(rawRealtimeUs); mTypeBatteryUptime = mSputeBatteryUptime(rawUptimeUs, mStatsType); mTypeBatteryRealtime = mSputeBatteryRealtime(rawRealtimeUs, mStatsType); mBatteryTimeRemaining = mSputeBatteryTimeRemaining(rawRealtimeUs);/获取电池剩余时间 mChargeTimeRemaining = mSputeChargeTimeRemaining(rawRealtimeUs);/获取充电剩余时间 if (DEBUG) Log.d(TAG, Raw time: realtime= + (rawRealtimeUs/1000) + uptime= + (rawUptimeUs/1000); Log.d(TAG, Battery time: realtime= + (mBatteryRealtime/1000) + uptime= + (mBatteryUptime/1000); Log.d(TAG, Battery type time: realtime= + (mTypeBatteryRealtime/1000) + uptime= + (mTypeBatteryUptime/1000); mMinDrainedPower = (mStats.getLowDischargeAmountSinceCharge() * mPowerProfile.getBatteryCapacity() / 100; mMaxDrainedPower = (mStats.getHighDischargeAmountSinceCharge() * mPowerProfile.getBatteryCapacity() / 100; processAppUsage(asUsers);/计算每个uid的耗电情况 / Before aggregating apps in to users, collect all apps to sort by their ms per packet. for (int i=0; imUsageList.size(); i+) BatterySipper bs = mUsageList.get(i); puteMobilemspp(); if (bs.mobilemspp != 0) mMobilemsppList.add(bs); for (int i=0; imUserSippers.size(); i+) List user = mUserSippers.valueAt(i); for (int j=0; juser.size(); j+) BatterySipper bs = user.get(j); puteMobilemspp(); if (bs.mobilemspp != 0) mMobilemsppList.add(bs); Collections.sort(mMobilemsppList, new Comparator() Override public int compare(BatterySipper lhs, BatterySipper rhs) if (lhs.mobilemspp rhs.mobilemspp) return -1; return 0; ); processMiscUsage();/计算比如屏幕、wifi、蓝牙等耗电 if (DEBUG) Log.d(TAG, Accuracy: total computed= + makemAh(mComputedPower) + , min discharge= + makemAh(mMinDrainedPower) + , max discharge= + makemAh(mMaxDrainedPower); mTotalPower = mComputedPower; if (mStats.getLowDischargeAmountSinceCharge() 1) if (mMinDrainedPower mComputedPower) double amount = mMinDrainedPower - mComputedPower; mTotalPower = mMinDrainedPower; addEntryNoTotal(BatterySipper.DrainType.UNACCOUNTED, 0, amount);/加一个未统计电量 else if (mMaxDrainedPower mComputedPower) / double amount = mComputedPower - mMaxDrainedPower; addEntryNoTotal(BatterySipper.DrainType.OVERCOUNTED, 0, amount);/加一个over统计 Collections.sort(mUsageList); 下面先看processAppUsage函数，这个函数是看uid的耗电信息。java view plain copyprivate void processAppUsage(SparseArray asUsers) final boolean forAllUsers = (asUsers.get(UserHandle.USER_ALL) != null); . SparseArray uidStats = mStats.getUidStats(); final int NU = uidStats.size(); for (int iu = 0; iu NU; iu+) /遍历各个uid Uid u = uidStats.valueAt(iu); double p; / in mAs double power = 0; / in mAs double highestDrain = 0; String packageWithHighestDrain = null; Map processStats = u.getProcessStats(); long cpuTime = 0; long cpuFgTime = 0; long wakelockTime = 0; long gpsTime = 0; . if (cpuFgTime cpuTime) /先就算每个uid的cpu耗电 if (DEBUG & cpuFgTime cpuTime + 10000) Log.d(TAG, WARNING! Cputime is more than 10 seconds behind Foreground time); cpuTime = cpuFgTime; / Statistics may not have been gathered yet. power /= (60*60*1000); / Process wake lock usage Map wakelockStats = u.getWakelockStats(); for (Map.Entry wakelockEntry : wakelockStats.entrySet() Uid.Wakelock wakelock = wakelockEntry.getValue(); / Only care about partial wake locks since full wake locks / are canceled when the user turns the screen off. BatteryStats.Timer timer = wakelock.getWakeTime(BatteryStats.WAKE_TYPE_PARTIAL); if (timer != null) wakelockTime += timer.getTotalTimeLocked(mRawRealtime, which); appWakelockTimeUs += wakelockTime; wakelockTime /= 1000; / convert to millis / Add cost of holding a wake lock/计算uid的wakelock耗电 p = (wakelockTime * mPowerProfile.getAveragePower(PowerProfile.POWER_CPU_AWAKE) / (60*60*1000); if (DEBUG & p != 0) Log.d(TAG, UID + u.getUid() + : wake + wakelockTime + power= + makemAh(p); power += p; / Add cost of mobile traffic/计算uid移动数据耗电 . if (DEBUG & p != 0) Log.d(TAG, UID + u.getUid() + : mobile packets + (mobileRx+mobileTx) + active time + mobileActive + power= + makemAh(p); power += p; / Add cost of wifi traffic/计算wifi数据耗电 final long wifiRx = u.getNetworkActivityPackets(NETWORK_WIFI_RX_DATA, mStatsType); final long wifiTx = u.getNetworkActivityPackets(NETWORK_WIFI_TX_DATA, mStatsType); final long wifiRxB = u.getNetworkActivityBytes(NETWORK_WIFI_RX_DATA, mStatsType); final long wifiTxB = u.getNetworkActivityBytes(NETWORK_WIFI_TX_DATA, mStatsType); p = (wifiRx + wifiTx) * wifiPowerPerPacket; if (DEBUG & p != 0) Log.d(TAG, UID + u.getUid() + : wifi packets + (mobileRx+mobileTx) + power= + makemAh(p); power += p; / Add cost of keeping WIFI running. long wifiRunningTimeMs = u.getWifiRunningTime(mRawRealtime, which) / 1000; mAppWifiRunning += wifiRunningTimeMs; p = (wifiRunningTimeMs * mPowerProfile.getAveragePower(PowerProfile.POWER_WIFI_ON) / (60*60*1000); if (DEBUG & p != 0) Log.d(TAG, UID + u.getUid() + : wifi running + wifiRunningTimeMs + power= + makemAh(p); power += p; / Add cost of WIFI scans long wifiScanTimeMs = u.getWifiScanTime(mRawRealtime, which) / 1000; p = (wifiScanTimeMs * mPowerProfile.getAveragePower(PowerProfile.POWER_WIFI_SCAN) / (60*60*1000); if (DEBUG) Log.d(TAG, UID + u.getUid() + : wifi scan + wifiScanTimeMs + power= + makemAh(p); power += p; for (int bin = 0; bin = Process.FIRST_APPLICATION_UID) List list = mUserSippers.get(userId); if (list = null) list = new ArrayList(); mUserSippers.put(userId, list); list.add(app); if (power != 0) Double userPower = mUserPower.get(userId); if (userPower = null) userPower = power; else userPower += power; mUserPower.put(userId, userPower); else /或者直接加到mUsageList，mUsageList管理所有的耗电信息list mUsageList.add(app); if (power mMaxPower) mMaxPower = power; if (power mMaxRealPower) mMaxRealPower = power; mComputedPower += power; if (u.getUid() = 0) osApp = app; processMiscUsage函数是统计屏幕、wifi耗电等等java view plain copyprivate void processMiscUsage() addUserUsage(); addPhoneUsage(); addScreenUsage(); addFlashlightUsage(); addWiFiUsage(); addBluetoothUsage(); addIdleUsage(); / Not including cellular idle power / Dont compute radio usage if its a wifi-only device if (!mWifiOnly) addRadioUsage(); java view plain copyp