property_service.c其源码在system\core\init目录下，如果做需求开发，使用别人写的属性总是担心系统其他地方有没有调用这个属性，与其这样不如自己定义前缀搞独立，想怎么调用就怎么调用，逍遥自在。
首先在system/core/jni/property_service.c定义前缀，
在这个C文件中有 property_perms[] = {
{ "net.rmnet0.", AID_RADIO, 0 },
{ "net.gprs.", AID_RADIO, 0 },
{ "net.ppp", AID_RADIO, 0 },
{ "net.qmi", AID_RADIO, 0 },
{ "net.lte", AID_RADIO, 0 },
{ "net.cdma", AID_RADIO, 0 },
{ "ril.", AID_RADIO, 0 },
{ "gsm.", AID_RADIO, 0 },
{ "persist.radio", AID_RADIO, 0 },
{ "net.dns", AID_RADIO, 0 },
{ "sys.usb.config", AID_RADIO, 0 },
{ "net.", AID_SYSTEM, 0 },
{ "dev.", AID_SYSTEM, 0 },
{ "runtime.", AID_SYSTEM, 0 },
{ "hw.", AID_SYSTEM, 0 },
{ "sys.", AID_SYSTEM, 0 },
{ "sys.powerctl", AID_SHELL, 0 },
{ "service.", AID_SYSTEM, 0 },
{ "wlan.", AID_SYSTEM, 0 },
{ "bluetooth.", AID_BLUETOOTH, 0 },
{ "dhcp.", AID_SYSTEM, 0 },
{ "dhcp.", AID_DHCP, 0 },
};
我们先定义一个有个性的前缀把，比如 xiyangyang，既然是系统属性就给他AID_SYSTEM吧，
property_perms[] = {
。。。。。。。。
{ "dhcp.", AID_DHCP, 0 },
{"xiyangyang.",AID_SYSTEM,0}
};
然后调用时，就直接SystemProperties.set("xiyangyang.huitailang",1);SystemProperties.getInt("xiyangyang.huitailang",0);反正系统属性跟随系统的生命周期，重启就清零回归本源，所以一些临时数据上的处理就直接这样调用会省很多事
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