Question

 WifiManager wm = (WifiManager)ctx.getSystemService(Context.WIFI_SERVICE);
 String macAddress = wm.getConnectionInfo().getMacAddress();

它是十六进制格式的字符串，例如：

"00:23:76:B7:2B:4D"

我想将此字符串转换为字节数组，以便我可以在其上使用MessageDigest sha1

我使用\x模块使用excaping :代替hashlib，在Python中使用它。

但我会在android / java中这样做吗？谢谢！

Answer 1

此代码：

Byte.parseByte(mac[i], 16);

没有正确解析以字母开头的十六进制数字：“AE”，“EF”等...
修改后的代码：

WifiManager wm = (WifiManager) ctx.getSystemService(Context.WIFI_SERVICE);
if (wm != null) {
    String[] mac = wm.getConnectionInfo().getMacAddress().split(":");
    byte[] macAddress = new byte[6];        // mac.length == 6 bytes
    for(int i = 0; i < mac.length; i++) {
        macAddress[i] = Integer.decode("0x" + mac[i]).byteValue();
    }
}

Answer 2

WifiManager wm = (WifiManager)ctx.getSystemService(Context.WIFI_SERVICE);
byte[] macAddress = wm.getConnectionInfo().getMacAddress().getBytes();

修订解决方案：

WifiManager wm = (WifiManager)ctx.getSystemService(Context.WIFI_SERVICE);
String[] mac = wm.getConnectionInfo().getMacAddress().split(":");
byte[] macAddress = new byte[6];
for(int i = 0; i < mac.length; i++) {            
    macAddress[i] = Byte.parseByte(mac[i], 16);
}

Answer 3

通过这个你在字节数组中得到mac地址，所以你不需要转换它。

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;

public class App{

   public static void main(String[] args){

    InetAddress ip;
    try {

        ip = InetAddress.getLocalHost();
        System.out.println("Current IP address : " + ip.getHostAddress());

        NetworkInterface network = NetworkInterface.getByInetAddress(ip);

        byte[] mac = network.getHardwareAddress();

        System.out.print("Current MAC address : ");

        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < mac.length; i++) {
            sb.append(String.format("%02X%s", mac[i], (i < mac.length - 1) ? "-" : ""));        
        }
        System.out.println(sb.toString());

    } catch (UnknownHostException e) {

        e.printStackTrace();

    } catch (SocketException e){

        e.printStackTrace();

    }

   }

}

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复制

在java中将android mac地址hexstring转换为byte []

3 个答案: