通过java代码修改android的静态ip

可以通过以下代码修改 Android 设备的静态 IP 地址：

WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
WifiConfiguration wifiConfig = null;
WifiInfo connectionInfo = wifiManager.getConnectionInfo();
List<WifiConfiguration> configuredNetworks = wifiManager.getConfiguredNetworks();
if (configuredNetworks != null) {
    for (WifiConfiguration conf : configuredNetworks) {
        if (conf.networkId == connectionInfo.getNetworkId()) {
            wifiConfig = conf;
            break;
        }
    }
}
if (wifiConfig == null) {
    return;
}
try {
    // 修改 IP 地址
    InetAddress ip = InetAddress.getByName("192.168.1.100");
    int prefixLength = 24;
    int ipAddress = ip.hashCode();
    int netmask = prefixLength ==  ?  : xffffffff << (32 - prefixLength);
    wifiConfig.ipAssignment = WifiConfiguration.IpAssignment.STATIC;
    wifiConfig.setIpConfiguration(new WifiConfiguration.IpAssignment.StaticIpConfiguration(
            new StaticIpConfiguration(ipAddress, netmask, , , new int[]{})));
    wifiManager.updateNetwork(wifiConfig);
    wifiManager.saveConfiguration();
} catch (UnknownHostException e) {
    e.printStackTrace();
}

注意：需要在 AndroidManifest.xml 中添加以下权限：

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.WRITE_SETTINGS" />