Android系统默认可通过dumpsys获取如下的电池信息：
adb shell dumpsys battery
Current Battery Service state:
AC powered: false
USB powered: true
Wireless powered: false
Max charging current: 500000
Max charging voltage: 5000000
Charge counter: 2238960
status: 2
health: 2
present: true
level: 76
scale: 100
voltage: 4111
temperature: 268
technology: Li-ion
对应代码实现位置为：aosp/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(" Max charging current: " + mHealthInfo.maxChargingCurrent);
pw.println(" Max charging voltage: " + mHealthInfo.maxChargingVoltage);
pw.println(" Charge counter: " + mHealthInfo.batteryChargeCounter);
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.batteryVoltage);
pw.println(" temperature: " + mHealthInfo.batteryTemperature);
pw.println(" technology: " + mHealthInfo.batteryTechnology);
} else {
Shell shell = new Shell();
shell.exec(mBinderService, null, fd, null, args, null, new ResultReceiver(null));
}
}
}
电池常见log信息
# ---------------------------
# BatteryService.java
# ---------------------------
2722 battery_level (level|1|6),(voltage|1|1),(temperature|1|1)
2723 battery_status (status|1|5),(health|1|5),(present|1|5),(plugged|1|5),(technology|3)
# This is logged when battery goes from discharging to charging.
# It lets us count the total amount of time between charges and the discharge level
2730 battery_discharge (duration|2|3),(minLevel|1|6),(maxLevel|1|6)
另外/sys/class/power_supply下包括了所有的有关电池的信息，如下：
root:/sys/class/power_supply $ ls
ac battery charger usb
power_supply文件夹之下的子文件夹下会有一个type，如：
root:/ $ cat /sys/class/power_supply/ac/type
Mains
root:/sys/class/power_supply $ ls
ac battery charger usb
root:/sys/class/power_supply $ cat */type
Mains
Battery
Unknown
USB
type的值反应了当前的文件中的属性，其字符串和其属性的对应关系为：
{"Unknown", ANDROID_POWER_SUPPLY_TYPE_UNKNOWN},
{"Battery", ANDROID_POWER_SUPPLY_TYPE_BATTERY},
{"UPS", ANDROID_POWER_SUPPLY_TYPE_AC},
{"Mains", ANDROID_POWER_SUPPLY_TYPE_AC},
{"USB", ANDROID_POWER_SUPPLY_TYPE_USB},
{"USB_DCP", ANDROID_POWER_SUPPLY_TYPE_AC},
{"USB_HVDCP", ANDROID_POWER_SUPPLY_TYPE_AC},
{"USB_CDP", ANDROID_POWER_SUPPLY_TYPE_AC},
{"USB_ACA", ANDROID_POWER_SUPPLY_TYPE_AC},
{"USB_C", ANDROID_POWER_SUPPLY_TYPE_AC},
{"USB_PD", ANDROID_POWER_SUPPLY_TYPE_AC},
{"USB_PD_DRP", ANDROID_POWER_SUPPLY_TYPE_USB},
{"Wireless", ANDROID_POWER_SUPPLY_TYPE_WIRELESS},
（1）当前的充电类型：
AC powered: false
USB powered: true
Wireless powered: false
对应节点：
/sys/class/power_supply/%s/online
（2）当前的充电电流与电压：
Max charging current: 500000（微安）
Max charging voltage: 5000000（微伏）
Charge counter: 2238960（瞬时电池容量 uA-h）
//* 当以上两者相乘是会得到其充电功率，上层软件以此基础确定当前是否为慢/快速充电。
SettingsLib 下的BatteryStatus.java
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;
}
/**
* Return current chargin speed is fast, slow or normal.
*
* @return the charing speed
*/
public final int getChargingSpeed(Context context) {
final int slowThreshold = context.getResources().getInteger(
R.integer.config_chargingSlowlyThreshold);
final int fastThreshold = context.getResources().getInteger(
R.integer.config_chargingFastThreshold);
return maxChargingWattage <= 0 ? CHARGING_UNKNOWN :
maxChargingWattage < slowThreshold ? CHARGING_SLOWLY :
maxChargingWattage > fastThreshold ? CHARGING_FAST :
CHARGING_REGULAR;
}
SettingsLib下的config.xml有快慢充电的值，如下：
对应节点：
/sys/class/power_supply/%s/current_max
/sys/class/power_supply/%s/voltage_max
/sys/class/power_supply/battery/charge_counter
（3）电池状态：
status: 2
BatteryManager.BATTERY_STATUS_UNKNOWN = 1
BatteryManager.BATTERY_STATUS_CHARGING = 2
BatteryManager.BATTERY_STATUS_DISCHARGING = 3
BatteryManager.BATTERY_STATUS_NOT_CHARGING = 4 //*电池不充电-有充电器时的特殊情况，但电池不充电
BatteryManager.BATTERY_STATUS_FULL = 5
对应节点：
/sys/class/power_supply/battery/status
（4）电池健康状态：
health: 2
BatteryManager.BATTERY_HEALTH_UNKNOWN = 1
BatteryManager.BATTERY_HEALTH_GOOD = 2
BatteryManager.BATTERY_HEALTH_OVERHEAT = 3
BatteryManager.BATTERY_HEALTH_DEAD = 4
BatteryManager.BATTERY_HEALTH_OVER_VOLTAGE = 5
BatteryManager.BATTERY_HEALTH_UNSPECIFIED_FAILURE = 6 //*蓄电池出现未知/未指定的FID故障。
BatteryManager.BATTERY_HEALTH_COLD = 7
对应节点：
/sys/class/power_supply/battery/health
（5）电池瞬时电量：
level: 76
剩余电池容量百分比
对应节点：
/sys/class/power_supply/battery/capacity
（6）电池瞬时电压：
voltage: 4111（毫伏）
瞬时电池电压，以毫伏 (mV) 为单位
对应节点：
/sys/class/power_supply/battery/voltage_now
（7）电池瞬时温度：
temperature: 268
以摄氏度为单位的瞬时电池温度
对应节点：
/sys/class/power_supply/battery/temp
参考源码：
aosp/frameworks/base/services/core/java/com/android/server/BatteryService.java
aosp/frameworks/base/core/java/android/os/BatteryManager.java
aosp/frameworks/base/packages/SettingsLib/src/com/android/settingslib/fuelgauge/BatteryStatus.java
aosp/system/core/healthd/BatteryMonitor.cpp
aosp/hardware/interfaces/health/1.0/types.hal