android代码设置ipv4

要在Android应用程序中设置IPv4，可以使用以下代码：

WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
WifiConfiguration wifiConfig = null;
if (wifiManager != null) {
    wifiConfig = wifiManager.getConnectionInfo().getWifiConfiguration();
}
if (wifiConfig != null) {
    try {
        Field ipAddrField = WifiConfiguration.class.getDeclaredField("mIpAssignment");
        ipAddrField.setAccessible(true);
        ipAddrField.set(wifiConfig, WifiConfiguration.IpAssignment.STATIC);

        Field staticIpField = WifiConfiguration.class.getDeclaredField("mStaticIpConfiguration");
        staticIpField.setAccessible(true);

        StaticIpConfiguration staticIpConf = new StaticIpConfiguration();
        staticIpConf.ipAddress = InetAddress.getByName("192.168.0.100");
        staticIpConf.gateway = InetAddress.getByName("192.168.0.1");
        staticIpConf.dnsServers.add(InetAddress.getByName("8.8.8.8"));
        staticIpConf.dnsServers.add(InetAddress.getByName("8.8.4.4"));

        staticIpField.set(wifiConfig, staticIpConf);
        wifiManager.updateNetwork(wifiConfig);
        wifiManager.saveConfiguration();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

这个代码片段将WiFi连接的IP地址设置为静态IP地址，并将IP地址、网关和DNS服务器设置为指定的IPv4地址。你需要在Manifest文件中为你的应用程序添加以下权限：

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