Android5.0基础上到Android7.0，Android都自带了以太网的设置功能，基本上都是将ip地址和网关之类的信息通过StaticIpConfiguration该对象实现联网功能。到了Android 8.1 如果还是照着7.0的来写，可能会出现配置了基本信息，却不能通过静态ip上网的情况。不要问我怎么知道的，因为我就是碰到这个 坑了。

我默认你们已经知道怎么去实现设置ip的功能。在这个基础上，我们只需要修改一下framework层的代码就好。

设置静态ip的代码：

Editor etherEditor = etherModePreferences.edit();

etherEditor.putString("ether_mode", "STATIC");

etherEditor.commit();

try {

StaticIpConfiguration staticIpConfiguration = new StaticIpConfiguration();

InetAddress mIpAddr = NetworkUtils.numericToInetAddress(mIpaddr.getText().toString());

String[] strs = mMask.getText().toString().split("\\.");

int count = 0;

for(String str : strs){

if(str.equals("255")){

count++;

}

}

int prefixLength = count*8;

LinkAddress mIpAddress = new LinkAddress(mIpAddr,prefixLength);

InetAddress mGateway = NetworkUtils.numericToInetAddress(mGw.getText().toString());

ArrayList mDnsServers = new ArrayList();

mDnsServers.add(NetworkUtils.numericToInetAddress(mDns1.getText().toString()));

mDnsServers.add(NetworkUtils.numericToInetAddress(mDns2.getText().toString()));

staticIpConfiguration.ipAddress = mIpAddress;

staticIpConfiguration.gateway = mGateway;

staticIpConfiguration.dnsServers.addAll(mDnsServers);

config = new IpConfiguration(IpAssignment.STATIC, ProxySettings.NONE, staticIpConfiguration, ProxyInfo.buildDirectProxy(null,0));

mEthManager.setConfiguration(config);

}catch (Exception e) {

e.printStackTrace();

}

[点击并拖拽以移动]

​

通过上面的代码可以把静态ip地址设置，但是你发现你只写了这写方法并不能用以太网实现联网功能。这个时候我们就需要修改

frameworks\opt\net\ethernet\java\com\android\server\ethernet目录下面的EthernetNetworkFactory文件，代码如下：

public void startIpManager() {

if (DBG) {

Log.d(TAG, String.format("starting IpManager(%s): mNetworkInfo=%s", mIface,

mNetworkInfo));

}

LinkProperties linkProperties;

IpConfiguration config = mEthernetManager.getConfiguration();

if (config.getIpAssignment() == IpAssignment.STATIC) {

if (!setStaticIpAddress(config.getStaticIpConfiguration())) {

// We've already logged an error.

return;

}

linkProperties = config.getStaticIpConfiguration().toLinkProperties(mIface);

/* } else {

mNetworkInfo.setDetailedState(DetailedState.OBTAINING_IPADDR, null, mHwAddr);

IpManager.Callback ipmCallback = new IpManager.Callback() {

@Override

public void onProvisioningSuccess(LinkProperties newLp) {

mHandler.post(() -> onIpLayerStarted(newLp));

}

@Override

public void onProvisioningFailure(LinkProperties newLp) {

mHandler.post(() -> onIpLayerStopped(newLp));

}

@Override

public void onLinkPropertiesChange(LinkProperties newLp) {

mHandler.post(() -> updateLinkProperties(newLp));

}

};

stopIpManager();

mIpManager = new IpManager(mContext, mIface, ipmCallback); */

if (config.getProxySettings() == ProxySettings.STATIC ||

config.getProxySettings() == ProxySettings.PAC) {

// mIpManager.setHttpProxy(config.getHttpProxy());

linkProperties.setHttpProxy(config.getHttpProxy());

}

/* final String tcpBufferSizes = mContext.getResources().getString(

com.android.internal.R.string.config_ethernet_tcp_buffers); */

String tcpBufferSizes = mContext.getResources().getString(

com.android.internal.R.string.config_ethernet_tcp_buffers);

/* if (!TextUtils.isEmpty(tcpBufferSizes)) {

mIpManager.setTcpBufferSizes(tcpBufferSizes);

} */

if (TextUtils.isEmpty(tcpBufferSizes) == false) {

linkProperties.setTcpBufferSizes(tcpBufferSizes);

}

} else {

mNetworkInfo.setDetailedState(DetailedState.OBTAINING_IPADDR, null, mHwAddr);

}

/* final ProvisioningConfiguration provisioningConfiguration =

mIpManager.buildProvisioningConfiguration()

.withProvisioningTimeoutMs(0)

.build();

mIpManager.startProvisioning(provisioningConfiguration); */

// }

IpManager.Callback ipmCallback = new IpManager.Callback() {

@Override

public void onProvisioningSuccess(LinkProperties newLp) {

mHandler.post(() -> onIpLayerStarted(newLp));

}

@Override

public void onProvisioningFailure(LinkProperties newLp) {

mHandler.post(() -> onIpLayerStopped(newLp));

}

@Override

public void onLinkPropertiesChange(LinkProperties newLp) {

mHandler.post(() -> updateLinkProperties(newLp));

}

};

stopIpManager();

mIpManager = new IpManager(mContext, mIface, ipmCallback);

if (config.getProxySettings() == ProxySettings.STATIC ||

config.getProxySettings() == ProxySettings.PAC) {

mIpManager.setHttpProxy(config.getHttpProxy());

}

final String tcpBufferSizes = mContext.getResources().getString(

com.android.internal.R.string.config_ethernet_tcp_buffers);

if (!TextUtils.isEmpty(tcpBufferSizes)) {

mIpManager.setTcpBufferSizes(tcpBufferSizes);

}

if (config.getIpAssignment() == IpAssignment.STATIC) {

mIpManager.startProvisioning(config.getStaticIpConfiguration());

} else {

final ProvisioningConfiguration provisioningConfiguration =

mIpManager.buildProvisioningConfiguration()

.withProvisioningTimeoutMs(0)

.build();

mIpManager.startProvisioning(provisioningConfiguration);

}

}

通过设置修改以上代码就可以实现上网功能了。希望能对需要的人有用。