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当有需求，程序启动测试低功耗问题时，获取系统电池，电量信息；
1、使用 BatteryManager：
/**
* 获取当前系统电量 %
*/
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
private void getElectricity() {
BatteryManager batterymanager = (BatteryManager) getSystemService(BATTERY_SERVICE);
batterymanager.getIntProperty(BatteryManager.BATTERY_PROPERTY_CAPACITY);
Log.e("aaa batterymanager",+batterymanager.getIntProperty(BatteryManager.BATTERY_PROPERTY_CAPACITY)+"%");
}2、使用 IntentFilter ：
private void getElect() {
IntentFilter filter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
Intent receiver = instance.registerReceiver(null, filter);
int level = receiver.getIntExtra("level", 0);//获取当前电量
int scale = receiver.getIntExtra("scale", 0);//获取总电量
int status = receiver.getIntExtra("status", 0);//获取充电状态
int voltage = receiver.getIntExtra("voltage", 0);//获取电压(mv)
int temperature = receiver.getIntExtra("temperature", 0);//获取温度(数值)
double t = temperature / 10.0; //运算转换,电池摄氏温度，默认获取的非摄氏温度值
Log.e("aaa level",""+level+"%");
Log.e("aaa scale",""+scale);
Log.e("aaa status",""+status);
Log.e("aaa voltage",""+voltage);
Log.e("aaa temperature",""+t);
}3、日志 log：
12-05 09:25:26.304 22484-22484/com.ped.rtp E/aaa batterymanager: 11%
12-05 09:25:26.313 22484-22484/com.ped.rtp E/aaa level: 11%
12-05 09:25:26.313 22484-22484/com.ped.rtp E/aaa scale: 100
12-05 09:25:26.313 22484-22484/com.ped.rtp E/aaa status: 2
12-05 09:25:26.313 22484-22484/com.ped.rtp E/aaa voltage: 3541
12-05 09:25:26.313 22484-22484/com.ped.rtp E/aaa temperature: 26.3