android休眠的机制?能让我的进程继续运行吗?

[poke707]

我在做一个放电测试,系统是4.0,在锁屏后串口已经无输出,不知道我写的脚本还能检测到0%电量的时间点不?
如果脚本不能运行了,有什么办法能准确记录到0电量的时间点(不增加其他额外功耗)?
脚本如下:

echo "Begin Discharge-testing" > /sdcard/Discharge_test.txt
	 echo "Begin Time:" >> /sdcard/Discharge_test.txt
	 date >> /sdcard/Discharge_test.txt
	 echo "Begin capacity:" >> /sdcard/Discharge_test.txt
	 echo $(</sys/class/power_supply/battery/capacity) >> /sdcard/Discharge_test.txt
	 capacity=$(</sys/class/power_supply/battery/capacity)
	 while [ "${capacity}" \> "0" ]; do
	 	 echo $(</sys/class/power_supply/battery/capacity)
		 capacity=$(</sys/class/power_supply/battery/capacity)
		 sleep 2
	 done
	 	
	 echo "End Time:" >> /sdcard/Discharge_test.txt
	 date >> /sdcard/Discharge_test.txt
	 echo $(</sys/class/power_supply/battery/capacity) >> /sdcard/Discharge_test.txt