Android获取电池电量

方法一：注册广播（被动接受）

IntentFilter filter2 = new IntentFilter();
filter2.addAction(Intent.ACTION_BATTERY_CHANGED);
registerReceiver(filter2,receiver);
接收到广播后，用getIntExtra("level")和getIntExtra("scale")获得相应值
intent.getIntExtra("level", 0);    ///电池剩余电量
intent.getIntExtra("scale", 0);  ///获取电池满电量数值
intent.getStringExtra("technology");  ///获取电池技术支持
intent.getIntExtra("status",BatteryManager.BATTERY_STATUS_UNKNOWN); ///获取电池状态
intent.getIntExtra("plugged", 0);  ///获取电源信息
intent.getIntExtra("health",BatteryManager.BATTERY_HEALTH_UNKNOWN);  ///获取电池健康度
intent.getIntExtra("voltage", 0);  ///获取电池电压
intent.getIntExtra("temperature", 0);  ///获取电池温度

方法二：通过执行命令（不需要root）

通过 adb shell dumpsys battery，返回结果后有电池的各种信息，其中就包括level（百分比）

C:\Users\ShawnXia>adb shell dumpsys battery
Current Battery Service state:
  AC powered: false ///有线充电器状态
  USB powered: true ///USB连接状态
  Wireless powered: false ///无线充电状态
  Max charging current: 500000 ///最大充电电流，单位微安(uA)
  Max charging voltage: 5000000 ///最大充电电压，单位微伏(uV)
  Charge counter: 4149000 ///
  status: 2 ///充电状态，UNKNOWN=1，CHARGING=2，DISCHARGING=3，NOT_CHARGING=4，FULL=5
  health: 2 ///电池健康状态
  present: true ///
  level: 95 ///当前95%
  scale: 100 ///满电100%
  voltage: 4244 ///电压
  temperature: 250 ///温度
  technology: Li-ion

方法三：通过 BatteryManager

API >= 21 (5.0，L)
BatteryManager manager = (BatteryManager) getSystemService(BATTERY_SERVICE);
manager.getIntProperty(BatteryManager.BATTERY_PROPERTY_CHARGE_COUNTER);
manager.getIntProperty(BatteryManager.BATTERY_PROPERTY_CURRENT_AVERAGE);
manager.getIntProperty(BatteryManager.BATTERY_PROPERTY_CURRENT_NOW);
manager.getIntProperty(BatteryManager.BATTERY_PROPERTY_CAPACITY);///当前电量百分比
API >= 26 (8.0，O)
manager.getIntProperty(BatteryManager.BATTERY_PROPERTY_STATUS);///充电状态