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想要在代码中实现设置WIFI静态IP需要有系统权限，要在manifest文件添加android:sharedUserId=“android.uid.system”，还要有系统签名。 设置WIFI静态IP和之前以太网的类似，都是要构造StaticIpConfiguration对象，以及IpConfiguration.IpAssignment.STATIC就代表设置为静态IP，也可以设置DHCP（自动获取），不过WifiConfiguration可以直接通过WifiManager获取到，比设置以太网的要简单一些，不用反射来获取对象。

将IP，NETMASK，GATEWAY和DNS设置进去，构造StaticIpConfiguration对象，下边是代码：

try {Inet4Address inetAddr = getIPv4Address(STATIC_IP);    int prefixLength = NetUtils.maskStr2InetMask(STATIC_NETMASK);    InetAddress gatewayAddr = getIPv4Address(STATIC_GATEWAY);    InetAddress dnsAddr = getIPv4Address(STATIC_DNS1);    Class[] cl = new Class[]{InetAddress.class, int.class};    Constructor cons = null;    Class clazz = Class.forName("android.net.LinkAddress");    //取得所有构造函数    try {cons = clazz.getConstructor(cl);    } catch (NoSuchMethodException e) {e.printStackTrace();    }    if (cons == null) {return;    }    //给传入参数赋初值    Object[] x = {inetAddr, prefixLength};    //构造StaticIpConfiguration对象    Class staticIpConfigurationCls = Class.forName("android.net.StaticIpConfiguration");    //实例化StaticIpConfiguration    Object staticIpConfiguration = null;    staticIpConfiguration = staticIpConfigurationCls.newInstance();    Field ipAddress = staticIpConfigurationCls.getField("ipAddress");    Field gateway = staticIpConfigurationCls.getField("gateway");    Field dnsServers = staticIpConfigurationCls.getField("dnsServers");    //设置ipAddress    ipAddress.set(staticIpConfiguration, (LinkAddress) cons.newInstance(x));    //设置网关    gateway.set(staticIpConfiguration, gatewayAddr);    //设置dns    ArrayListdnsList = (ArrayList) dnsServers.get(staticIpConfiguration);    dnsList.add(dnsAddr);    if (!STATIC_DNS2.isEmpty()) {dnsList.add(getIPv4Address(STATIC_DNS2));    }    WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(WIFI_SERVICE);    WifiConfiguration wifiConfig = null;    WifiInfo connectionInfo = wifiManager.getConnectionInfo();  //得到连接的wifi网络    @SuppressLint("MissingPermission")    ListconfiguredNetworks = wifiManager.getConfiguredNetworks();    for (WifiConfiguration conf : configuredNetworks) {if (conf.networkId == connectionInfo.getNetworkId()) {wifiConfig = conf;            break;        }    }    @SuppressLint("PrivateApi") Class ipAssignmentCls = Class.forName("android.net.IpConfiguration$IpAssignment");    Object ipAssignment = Enum.valueOf(ipAssignmentCls, "STATIC");    Method setIpAssignmentMethod = wifiConfig.getClass().getDeclaredMethod("setIpAssignment", ipAssignmentCls);    setIpAssignmentMethod.invoke(wifiConfig, ipAssignment);    Method setStaticIpConfigurationMethod = wifiConfig.getClass().getDeclaredMethod("setStaticIpConfiguration", staticIpConfiguration.getClass());    //设置静态IP，将StaticIpConfiguration设置给WifiConfiguration    setStaticIpConfigurationMethod.invoke(wifiConfig, staticIpConfiguration);    //WifiConfiguration重新添加到WifiManager     int netId = wifiManager.addNetwork(wifiConfig);    wifiManager.disableNetwork(netId);    boolean flag = wifiManager.enableNetwork(netId, true);} catch (NoSuchFieldException | IllegalAccessException | InstantiationException | InvocationTargetException | ClassNotFoundException | NoSuchMethodException e) {e.printStackTrace();}

通过WifiConfiguration的setStaticIpConfiguration方法将StaticIpConfiguration对象设置进去，通过setIpAssignment，将IpAssignment设置进去，值设为STATIC，最后根据netId 重启这个网络，即可将静态IP设置成功。