1. 首先添加相关的权限

在 AndroidManifest.xml 文件中添加INTERNET权限

<uses-permission android:name="android.permission.INTERNET" />

2.1 获取mac地址【JAVA方法】

public static String getMacAddress() {
    try {
        List<NetworkInterface> infos = Collections.list(NetworkInterface.getNetworkInterfaces());

        for (NetworkInterface info: infos) {
            if (!info.getName().equals("wlan0")) {
                continue;
            }
            byte[] macBytes = info.getHardwareAddress();
            List<String> macByteList = new ArrayList<>();
            for (Byte byt: macBytes) {
                macByteList.add(String.format("%02X", byt));
            }
            return String.join(":", macByteList);
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return "00:00:00:00:00:00";
}

2.2 获取mac地址 kotlin方法】

fun getMacAddress(): String? {
    try {
        val infos: List<NetworkInterface> =
            Collections.list(NetworkInterface.getNetworkInterfaces())
        for (info in infos) {
            if (info.name != "wlan0") {
                continue
            }
            val macBytes = info.hardwareAddress
            val macByteList: MutableList<String> = ArrayList()
            for (byt in macBytes) {
                macByteList.add(String.format("%02X", byt))
            }
            return java.lang.String.join(":", macByteList)
        }
    } catch (e: java.lang.Exception) {
        e.printStackTrace()
    }
    return "00:00:00:00:00:00"
}