dumpsys battery 简介

一. dump 代码位置

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

    public void onStart() {
...
mBinderService = new BinderService();
publishBinderService("battery", mBinderService);
...
}

private final class BinderService extends Binder {
@Override protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
if (!DumpUtils.checkDumpPermission(mContext, TAG, pw)) return;

            if (args.length > 0 && "--proto".equals(args[0])) {
dumpProto(fd);
} else {
dumpInternal(fd, pw, args);
}
}

        @Override public void onShellCommand(FileDescriptor in, FileDescriptor out,
FileDescriptor err, String[] args, ShellCallback callback,
ResultReceiver resultReceiver) {
(new Shell()).exec(this, in, out, err, args, callback, resultReceiver);
}
}

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);
pw.println("  Charging state: " + mHealthInfo.chargingState);
pw.println("  Charging policy: " + mHealthInfo.chargingPolicy);
} else {
Shell shell = new Shell();
shell.exec(mBinderService, null, fd, null, args, null, new ResultReceiver(null));
}
}
}

二. dump 内容解析
Current Battery Service state:

  //Ac: 交流电,墙上的插头充电器，通常支持更高的功率(快充)。

  // false: 表示不是快充.

  //代码:mHealthInfo.chargerAcOnline

  AC powered: false

  //设备是否正在通过 USB 电源充电,true 表示是.

  //代码:mHealthInfo.chargerUsbOnline
USB powered: true

  //设备是否进行无线充电,false: 表示没有无线充电.

  //代码:mHealthInfo.chargerWirelessOnline
Wireless powered: false

  //设备是否底座充电 ,false:表示没有底座充电

  //代码:mHealthInfo.chargerDockOnline
Dock powered: false

  //最大充电电流：500000 μA

  //代码:mHealthInfo.maxChargingCurrentMicroamps
Max charging current: 500000

   //最大充电电压：5000000 μV

  //代码:mHealthInfo.maxChargingVoltageMicrovolts
Max charging voltage: 5000000

  //电荷计数器：4017000 μAh

  //代码:mHealthInfo.batteryChargeCounterUah
Charge counter: 4017000

 //电池状态：充满。
//常见状态代码：
//2 = BATTERY_STATUS_FULL (已充满)
//3 = 放电中
//5 = 充电中

  //代码:mHealthInfo.batteryStatus
status: 2

  //电池健康状态：良好。
//常见健康代码：
  //2 = BATTERY_HEALTH_GOOD (良好)

  //代码:mHealthInfo.batteryHealth

  //健康度：2
health: 2

  //检测到电池存在

  //代码:mHealthInfo.batteryPresent
present: true

 //当前电池剩余电量为 100%。

  //代码:mHealthInfo.batteryLevel
level: 100

  //电量百分比的最大值为 100（这是标准值）。

  //代码:BATTERY_SCALE

  //private static final int BATTERY_SCALE = 100;    // battery capacity is a percentage
scale: 100

   //代码:mHealthInfo.batteryVoltageMillivolts

   //电压：4364 mV
voltage: 4364

  //电池当前温度为 27.0°C

   //代码:mHealthInfo.batteryTemperatureTenthsCelsius
temperature: 270

   //电池类型为锂离子电池。

   //代码:mHealthInfo.batteryTechnology
technology: Li-ion

   //充电状态：0

   //当前未在充电（因为电池已满，停止充电）。
这个字段是硬件层面的状态，与 status 字段相关联。因为已充满，所以充电回路已断开。

   //代码: mHealthInfo.chargingState
Charging state: 0

  //充电策略：0
//充电策略：自适应。
//通常 0 表示系统自适应的常规充电模式（与 1 的“强制慢充”等模式相对）。

   //代码:mHealthInfo.chargingPolicy
Charging policy: 0