我不是在谈论如何读取值。
相反，我对如何设置 BatteryManager.EXTRA_HEALTH 的值感兴趣。
它来自固件吗？制造商具体？
是什么决定了这些价值观？
int BATTERY_HEALTH_COLD
int BATTERY_HEALTH_DEAD
int BATTERY_HEALTH_GOOD
int BATTERY_HEALTH_OVERHEAT
int BATTERY_HEALTH_OVER_VOLTAGE
int BATTERY_HEALTH_UNKNOWN
int BATTERY_HEALTH_UNSPECIFIED_FAILURE
谢谢，西蒙
更具体地说：电池健康状况由驱动程序（在内核中）确定。所述驱动程序通过 sys 文件系统（准确地说是 /sys/class/power_supply）导出信息。Android 守护程序 healthd（截至 KK，4.4.x）获取此信息，并在其上实现 IBatteryPropertiesRegistrar 接口。它连续轮询（使用 epoll_wait 在超时循环中运行以进行定期更新，以及 POWER 子系统的 netlink 通知 - 例如，如果您连接或断开充电器）。然后系统的 BatteryStatsService 向 healthd 注册一个监听器（通过 binder），然后获取 healthd 发布的数据，
查看 /sys/class/power_supply，您将看到：
lrwxrwxrwx root root 1970-02-05 14:20 ac -> ../../devices/f9923000.i2c/i2c-84/84-006b/power_supply/ac
lrwxrwxrwx root root 1970-02-05 14:20 batt_therm -> ../../devices/battery_tm_ctrl.78/power_supply/batt_therm
lrwxrwxrwx root root 1970-02-05 14:20 battery -> ../../devices/f9923000.i2c/i2c-84/84-0036/power_supply/battery
lrwxrwxrwx root root 1970-02-05 14:20 touch -> ../../devices/virtual/power_supply/touch
lrwxrwxrwx root root 1970-02-05 14:20 usb -> ../../devices/msm_dwc3/power_supply/usb
lrwxrwxrwx root root 1970-02-05 14:20 wireless -> ../../devices/bq51013b_wlc.77/power_supply/wireless
然后查看“电池”
/sys/devices/f9923000.i2c/i2c-84/84-0036/power_supply/battery:
-r--r--r-- root root 4096 2014-02-26 13:26 capacity
-r--r--r-- root root 4096 2014-02-26 13:26 charge_full_design
-r--r--r-- root root 4096 2014-02-26 13:26 current_now
lrwxrwxrwx root root 2014-02-26 13:26 device -> ../../../84-0036
-r--r--r-- root root 4096 2014-02-26 13:26 health
drwxr-xr-x root root 2014-02-26 13:26 power
-r--r--r-- root root 4096 2014-02-26 13:26 present
-r--r--r-- root root 4096 2014-02-26 13:26 status
lrwxrwxrwx root root 2014-02-26 13:26 subsystem -> ../../../../../../class/power_supply
-r--r--r-- root root 4096 2014-02-26 13:26 technology
-r--r--r-- root root 4096 2014-02-26 13:26 temp
-r--r--r-- root root 4096 2014-02-26 13:26 type
-rw-r--r-- root root 4096 2014-02-26 13:26 uevent
-r--r--r-- root root 4096 2014-02-26 13:26 voltage_max_design
-r--r--r-- root root 4096 2014-02-26 13:26 voltage_min_design
-r--r--r-- root root 4096 2014-02-26 13:26 voltage_now
通过查看文件，所有细节都将被揭示。
通过使用此代码，您可以获得有关电池的信息。
private BroadcastReceiver battery_receiver = new BroadcastReceiver()
{
@Override
public void onReceive(Context context, Intent intent)
{
boolean isPresent = intent.getBooleanExtra("present", false);
String technology = intent.getStringExtra("technology");
int plugged = intent.getIntExtra("plugged", -1);
int scale = intent.getIntExtra("scale", -1);
int health = intent.getIntExtra("health", 0);
int status = intent.getIntExtra("status", 0);
int rawlevel = intent.getIntExtra("level", -1);
int level = 0;
String temp=null;
Bundle bundle = intent.getExtras();
Log.i("BatteryLevel", bundle.toString());
if(isPresent)
{
if (rawlevel >= 0 && scale > 0) {
level = (rawlevel * 100) / scale;
}
String info = "Battery Level: " + level + "%\n";
info += ("Technology: " + technology + "\n");
info += ("Plugged: " + getPlugTypeString(plugged) + "\n");
info += ("Health: " + getHealthString(health) + "\n");
info += ("Status: " + getStatusString(status) + "\n");
info += ("Temp: "+getTempStatus(temp,intent)+"\n");
setBatteryLevelText(info + "\n\n" + bundle.toString());
}
else
{
setBatteryLevelText("Battery not present!!!");
}
}
};
private void registerBatteryLevelReceiver(){
IntentFilter filter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
registerReceiver(battery_receiver, filter);
}
锂离子电池具有简单的车载计算机，可以跟踪和报告健康状况；状态指标是标准化的，但触发它们由电池报告的条件由电池制造商确定。