苦心钻研6天以及各路朋友的帮助下终于有了成果，安卓6.0系统重启后也可以修改有关有线网的IP，网关地址等。
在这里分享出来，帮助更多人少走弯路。
不罗嗦切入正题，实现以太网的IP修改主要分为以下步骤：
一.拿到系统的Framework源码，也就是jar包(目的调用系统的隐藏方法)
我的jar是底层开发的同事给我的，导入到项目中，导入方式可参考这个帖子：
http://www.jianshu.com/p/ccda0c6938ea
二.调用系统源码，修改信息
(1)声明变量：
EthernetManager mEthManager;
privatestatic String mEthIpAddress = "192.168.253.247";//IP
privatestatic String mEthNetmask = "255.255.255.0";// 子网掩码
privatestatic String mEthGateway = "192.168.88.1";//网关
privatestatic String mEthdns1 = "8.8.8.8";// DNS1
privatestatic String mEthdns2 = "8.8.4.4";// DNS2
(2)在需要改变信息的地方加上如下代码：
mEthManager = (EthernetManager)getSystemService("ethernet");
InetAddress ipaddr=NetworkUtils.numericToInetAddress(mEthIpAddress);
DhcpInfo dhcpInfo = new DhcpInfo();
dhcpInfo.ipAddress = inetAddressToInt(ipaddr);
Inet4Address inetAddr= Utils.getIPv4Address(mEthIpAddress);
int prefixLength=Utils.maskStr2InetMask(mEthNetmask);
InetAddress gatewayAddr = Utils.getIPv4Address(mEthGateway);
InetAddress dnsAddr = Utils.getIPv4Address(mEthdns1);
if (inetAddr.getAddress().toString().isEmpty() || prefixLength ==0 || gatewayAddr.toString().isEmpty()
|| dnsAddr.toString().isEmpty()) {
return;
}
Class clazz = null;
try {
clazz = Class.forName("android.net.LinkAddress");
} catch (Exception e) {
// TODO: handle exception
}
Class[] cl = new Class[]{InetAddress.class, int.class};
Constructor cons = null;
try {
cons = clazz.getConstructor(cl);
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
Object[] x = {inetAddr, prefixLength};
StaticIpConfiguration mStaticIpConfiguration = new StaticIpConfiguration();
String dnsStr2 = mEthdns2;
//mStaticIpConfiguration.ipAddress = new LinkAddress(inetAddr, prefixLength);
try {
mStaticIpConfiguration.ipAddress = (LinkAddress) cons.newInstance(x);
Log.d("232323", "chanson 1111111");
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
mStaticIpConfiguration.gateway=gatewayAddr;
mStaticIpConfiguration.dnsServers.add(dnsAddr);
if (!dnsStr2.isEmpty()) {
mStaticIpConfiguration.dnsServers.add(Utils.getIPv4Address(dnsStr2));
}
Log.d("2312321", "chanson mStaticIpConfiguration ====" + mStaticIpConfiguration);
IpConfiguration mIpConfiguration = new IpConfiguration(IpConfiguration.IpAssignment.STATIC,
IpConfiguration.ProxySettings.NONE, mStaticIpConfiguration, null);
mEthManager.setConfiguration(mIpConfiguration);
Utils类相关方法：
public static Inet4Address getIPv4Address(String text) {
try {
return (Inet4Address) NetworkUtils.numericToInetAddress(text);
} catch (IllegalArgumentException|ClassCastException e) {
return null;
}
}
public static int maskStr2InetMask(String maskStr) {
StringBuffer sb ;
String str;
int inetmask = 0;
int count = 0;
/*
* check the subMask format
*/
Pattern pattern = Pattern.compile("(^((\\d|[01]?\\d\\d|2[0-4]\\d|25[0-5])\\.){3}(\\d|[01]?\\d\\d|2[0-4]\\d|25[0-5])$)|^(\\d|[1-2]\\d|3[0-2])$");
if (pattern.matcher(maskStr).matches() == false) {
Log.e("33333","subMask is error");
return 0;
}
String[] ipSegment = maskStr.split("\\.");
for(int n =0; n
sb = new StringBuffer(Integer.toBinaryString(Integer.parseInt(ipSegment[n])));
str = sb.reverse().toString();
count=0;
for(int i=0; i
i=str.indexOf("1",i);
if(i==-1)
break;
count++;
}
inetmask+=count;
}
return inetmask;
}
三.签名，打包(目的为了获取系统权限)
(1)在桌面新建文件夹，放入以下文件：
(2)编辑signapk.bat文件：
(3)双击signapk.bat，会在新建文件夹下看到new.apk，装到手机看效果即可。
至此所有步骤完成，如果有写的不好的地方请见谅，有错误请指正批评，有更好的实现方式请留言，谢谢支持。
参考帖子：http://www.jianshu.com/p/e1191c41d70a
补充：修改以太网，网络连接模式(动态获取或静态)
找到代码： IpConfiguration mIpConfiguration = new IpConfiguration(IpConfiguration.IpAssignment.STATIC, IpConfiguration.ProxySettings.NONE, mStaticIpConfiguration, null);
第一个参数，点击进入可以看到有三个选项：STATIC,DHCP,UNASSIGNED；选择STATIC即静态链接，DHCP即动态获取。
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