【Battery】慢速和快速充电的显示逻辑

一、需求描述

基于 Android 14平台，锁屏界面显示为慢速充电，慢速 会造成用户体验不好，需要修改为充电，并重新配置快速充电的阈值。

二、需求分析

SystemUI 锁屏界面上显示充电表示的逻辑：src/com/android/systemui/statusbar/KeyguardIndicationController.java

if (mPowerPluggedInWired) {switch (mChargingSpeed) {case BatteryStatus.CHARGING_FAST:chargingId = hasChargingTime? R.string.keyguard_indication_charging_time_fast: R.string.keyguard_plugged_in_charging_fast;break;case BatteryStatus.CHARGING_SLOWLY:chargingId = hasChargingTime? R.string.keyguard_indication_charging_time_slowly: R.string.keyguard_plugged_in_charging_slowly;break;default:chargingId = hasChargingTime? R.string.keyguard_indication_charging_time: R.string.keyguard_plugged_in;break;}
} 

主要通过系统电池状态 BatteryStatus.CHARGING_FAST 和 BatteryStatus.CHARGING_SLOWLY 来区分快速、慢速和正常充电的。mChargingSpeed 的赋值是 KeyguardUpdateMonitor 的回调来更新状态 onRefreshBatteryInfo

/*** KeyguardUpdateMonitor only sends "interesting" battery updates* {@link KeyguardUpdateMonitor#isBatteryUpdateInteresting}.* Therefore, make sure to always check plugged in state along with any charging status* change, or else we could end up with stale state.*/
@Override
public void onRefreshBatteryInfo(BatteryStatus status) {boolean isChargingOrFull = status.status == BatteryManager.BATTERY_STATUS_CHARGING|| status.isCharged();boolean wasPluggedIn = mPowerPluggedIn;mPowerPluggedInWired = status.isPluggedInWired() && isChargingOrFull;mPowerPluggedInWireless = status.isPluggedInWireless() && isChargingOrFull;mPowerPluggedInDock = status.isPluggedInDock() && isChargingOrFull;mPowerPluggedIn = status.isPluggedIn() && isChargingOrFull;mPowerCharged = status.isCharged();mChargingWattage = status.maxChargingWattage;mChargingSpeed = status.getChargingSpeed(mContext);mBatteryLevel = status.level;mBatteryPresent = status.present;mBatteryDefender = status.isBatteryDefender();// when the battery is overheated, device doesn't charge so only guard on pluggedIn:mEnableBatteryDefender = mBatteryDefender && status.isPluggedIn();mIncompatibleCharger = status.incompatibleCharger.orElse(false);try {mChargingTimeRemaining = mPowerPluggedIn? mBatteryInfo.computeChargeTimeRemaining() : -1;} catch (RemoteException e) {mKeyguardLogger.log(TAG, ERROR, "Error calling IBatteryStats", e);mChargingTimeRemaining = -1;}mKeyguardLogger.logRefreshBatteryInfo(isChargingOrFull, mPowerPluggedIn, mBatteryLevel,mBatteryDefender);updateDeviceEntryIndication(!wasPluggedIn && mPowerPluggedInWired);
}

再通过 SettingLib： src/com/android/settingslib/fuelgauge/BatteryStatus.java，找到判断 CHARGING_FAST 或 CHARGING_SLOWLY 或 CHARGING_REGULAR 的状态判断逻辑

public final int getChargingSpeed(Context context) {final int slowThreshold = context.getResources().getInteger(R.integer.config_chargingSlowlyThreshold);// <integer name="config_chargingFastThreshold_unisoc">15000000</integer>// 这里 Sprd 做过修改final int fastThreshold =UniSettingsLibComponentFactory.getInstance().getChargingFastThreshold(context);return maxChargingWattage <= 0 ? CHARGING_UNKNOWN :maxChargingWattage < slowThreshold ? CHARGING_SLOWLY :maxChargingWattage > fastThreshold ? CHARGING_FAST :CHARGING_REGULAR;
}

config_chargingSlowlyThreshold 的定义如下，config_chargingFastThreshold 暂未使用而是使用 unisoc 修改的 config

<!-- Threshold in micro watts below which a charger is rated as "slow"; 1A @ 5V -->
<integer name="config_chargingSlowlyThreshold">5000000</integer><!-- Threshold in micro watts above which a charger is rated as "fast"; 1.5A @ 5V  -->
<integer name="config_chargingFastThreshold">7500000</integer>

上诉的 maxChargingWattage 的赋值如下，是通过 batteryChangedIntent

private BatteryStatus(Intent batteryChangedIntent, Optional<Boolean> incompatibleCharger) {status = batteryChangedIntent.getIntExtra(EXTRA_STATUS, BATTERY_STATUS_UNKNOWN);plugged = batteryChangedIntent.getIntExtra(EXTRA_PLUGGED, 0);level = getBatteryLevel(batteryChangedIntent);chargingStatus = batteryChangedIntent.getIntExtra(EXTRA_CHARGING_STATUS,CHARGING_POLICY_DEFAULT);present = batteryChangedIntent.getBooleanExtra(EXTRA_PRESENT, true);this.incompatibleCharger = incompatibleCharger;final int maxChargingMicroAmp = batteryChangedIntent.getIntExtra(EXTRA_MAX_CHARGING_CURRENT,-1);int maxChargingMicroVolt = batteryChangedIntent.getIntExtra(EXTRA_MAX_CHARGING_VOLTAGE, -1);if (maxChargingMicroVolt <= 0) {maxChargingMicroVolt = DEFAULT_CHARGING_VOLTAGE_MICRO_VOLT;}if (maxChargingMicroAmp > 0) {// Calculating muW = muA * muV / (10^6 mu^2 / mu); splitting up the divisor// to maintain precision equally on both factors.maxChargingWattage = (maxChargingMicroAmp / 1000)* (maxChargingMicroVolt / 1000);} else {maxChargingWattage = -1;}}

三、解决方案

为了修改锁屏界面上的显示慢速充电或者快速充电的阈值，直接调整 2 个config 的值即可！如果不想显示为慢速充电，将 config_chargingSlowlyThreshold 修改为不为 0 的极小值即可，如1。

<integer name="config_chargingSlowlyThreshold">1</integer>
<integer name="config_chargingFastThreshold_unisoc">15000000</integer>

除了锁屏界面，设置 - 电池界面也有这样的显示，逻辑相同。

四、Battery 扩展

frameworks/base/services/core/java/com/android/server/BatteryService.java

private void dumpInternal(FileDescriptor fd, PrintWriter pw, String[] args) {synchronized (mLock) {if (args == null || args.length == 0 || "-a".equals(args[0])) {pw.println("Current Battery Service state:");if (mUpdatesStopped) {pw.println("  (UPDATES STOPPED -- use 'reset' to restart)");}pw.println("  AC powered: " + mHealthInfo.chargerAcOnline);pw.println("  USB powered: " + mHealthInfo.chargerUsbOnline);pw.println("  Wireless powered: " + mHealthInfo.chargerWirelessOnline);pw.println("  Dock powered: " + mHealthInfo.chargerDockOnline);pw.println("  Max charging current: " + mHealthInfo.maxChargingCurrentMicroamps);pw.println("  Max charging voltage: " + mHealthInfo.maxChargingVoltageMicrovolts);pw.println("  Charge counter: " + mHealthInfo.batteryChargeCounterUah);pw.println("  status: " + mHealthInfo.batteryStatus);pw.println("  health: " + mHealthInfo.batteryHealth);pw.println("  present: " + mHealthInfo.batteryPresent);pw.println("  level: " + mHealthInfo.batteryLevel);pw.println("  scale: " + BATTERY_SCALE);pw.println("  voltage: " + mHealthInfo.batteryVoltageMillivolts);pw.println("  temperature: " + mHealthInfo.batteryTemperatureTenthsCelsius);pw.println("  technology: " + mHealthInfo.batteryTechnology);} else {Shell shell = new Shell();shell.exec(mBinderService, null, fd, null, args, null, new ResultReceiver(null));}}
}

可以通过 ADB 命令 dump BatteryService 的相关信息：

C:\Users\Administrator>adb shell dumpsys battery
Current Battery Service state:AC powered: falseUSB powered: trueWireless powered: falseDock powered: falseMax charging current: 500000Max charging voltage: 5000000Charge counter: 1status: 2health: 2present: truelevel: 95scale: 100voltage: 4313temperature: 325technology: Li-ion

电池状态信息参数解析：

参数	数值	说明
AC powered	false	设备未通过交流电源（如墙式充电器）充电。
USB powered	true	设备正在通过 USB 连接充电。
Wireless powered	false	设备未通过无线方式充电。
Dock powered	false	设备未通过底座充电。
Max charging current	500000	当前配置的最大充电电流为 500,000 微安 (µA)，即 500 毫安 (mA)。
Max charging voltage	5000000	当前配置的最大充电电压为 5,000,000 微伏 (µV)，即 5 伏 (V)。
Charge counter	1029715	电池的电荷计数器，单位通常为微安时 (µAh)，用于跟踪电池的充放电周期。
status	2	电池状态。2表示电池正处于充电状态。其他常见状态包括：3（未充电）、4（不充电）、5（已充满）。
health	2	电池健康状态。2表示电池健康状况良好。
present	true	表示电池已安装在设备中。
level	64	当前电池电量百分比为 64%。
scale	100	电池电量的满量程为 100%。
voltage	4020	当前电池的电压为 4020 毫伏 (mV)，即 4.02 伏 (V)。
temperature	266	电池的温度为 266，单位是十分之一摄氏度。因此实际温度为 26.6 摄氏度。
technology	Li-ion	电池技术类型为锂离子电池。

这个命令只能查看当前的电压，没有显示当前的电流，可以尝试直接读取系统文件来获取电流值，使用以下命令查看相关文件是否存在并包含数据：

adb shell cat /sys/class/power_supply/battery/current_now

如果这个路径不存在，可以尝试列出电源供应目录下的内容，寻找可能的文件：

adb shell ls -la /sys/class/power_supply/
adb shell ls -la /sys/class/power_supply/*/current_now

找到的正确文件可能会返回一个以微安（µA）为单位的数值，负值表示充电，正值表示放电。