/**

     * 获取手机MAC地址

     * @return

     */

    public String getLocalMac()

    {

        String mac = "";

        // 获取wifi管理器

        WifiManager wifiMng = (WifiManager)getSystemService(Context.WIFI_SERVICE);

        WifiInfo wifiInfor = wifiMng.getConnectionInfo();

        mac=wifiInfor.getMacAddress();

        return mac;

    }

 /**
     * 获取mac地址
     * @param cxt
     * @return
     */
    public static String getPhoneMac(Context cxt) {
    	
    	String macAddress = null;  
    	WifiManager wifiMgr = (WifiManager) cxt.getSystemService(Context.WIFI_SERVICE);  
    	WifiInfo info = wifiMgr.getConnectionInfo();  
    	if (null != info) {  
    	    macAddress = info.getMacAddress();  
    	    System.out.println("WifiManager mac: " + macAddress);
    	}  
    	if(StringUtils.isEmpty(macAddress)) {
    		macAddress = getLocalMacAddressFromIp();
    		 System.out.println("ip mac: " + macAddress);
    	}
    	
        return macAddress;
    }

	public static String getLocalMacAddressFromIp() {
		String mac_s = "";
		try {
			byte[] mac;
			NetworkInterface ne = NetworkInterface.getByInetAddress(InetAddress.getByName(getLocalIpAddress()));
			mac = ne.getHardwareAddress();
			mac_s = byte2hex(mac);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return mac_s;
	}
	
	public static String getLocalIpAddress() {
		try {
			String ipv4;
			List<NetworkInterface> nilist = Collections.list(NetworkInterface
					.getNetworkInterfaces());
			for (NetworkInterface ni : nilist) {
				List<InetAddress> ialist = Collections.list(ni
						.getInetAddresses());
				for (InetAddress address : ialist) {
					if (!address.isLoopbackAddress()
							&& InetAddressUtils.isIPv4Address(ipv4 = address
									.getHostAddress())) {
						return ipv4;
					}
				}
			}
		} catch (SocketException ex) {
			Log.e("SystemUtils", ex.toString());
		}
		return null;
	}
	
	private static String byte2hex(byte[] b) {
		StringBuffer hs = new StringBuffer(b.length);
		String stmp = "";
		int len = b.length;
		for (int n = 0; n < len; n++) {
			stmp = Integer.toHexString(b[n] & 0xFF);
			if (stmp.length() == 1) {
				hs = hs.append("0").append(stmp);
			} else {
				hs = hs.append(stmp);
			}
			if(n < len-1) {
				hs.append(":");
			}
		}
		return String.valueOf(hs);
	}
    

private String getMacAddress(){  

         String result = "";  

         WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);  

         WifiInfo wifiInfo = wifiManager.getConnectionInfo();  

         result = wifiInfo.getMacAddress();  

         Log.i(TAG, "macAdd:" + result);  

         return result;  

 }  

Android获取手机mac地址根据系统版本有几个不同的获取方式，6.0之前的  6.0-7.0的，7.0之后的都各不一样，直接上代码：

    /**
     * Android 6.0 之前（不包括6.0）获取mac地址
     * 必须的权限 <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>
     * @param context * @return
     */
    private String getMacDefault(Context context) {
        String mac = "0";
        if (context == null) {
            return mac;
        }
        WifiManager wifi = (WifiManager)context.getSystemService(Context.WIFI_SERVICE);
        WifiInfo info = null;
        try {
            info = wifi.getConnectionInfo();
        } catch (Exception e) {
            e.printStackTrace();
        }

        if (info == null) {
            return null;
        }
        mac = info.getMacAddress();

        return mac;
    }

    /**
     * Android 6.0-Android 7.0 获取mac地址
     */
    private String getMacAddress() {
        String macSerial = null;
        String str = "0";

        try {
            Process pp = Runtime.getRuntime().exec("cat/sys/class/net/wlan0/address");
            InputStreamReader ir = new InputStreamReader(pp.getInputStream());
            LineNumberReader input = new LineNumberReader(ir);

            while (null != str) {
                str = input.readLine();
                if (str != null) {
                    macSerial = str.trim(); //去空格
                    break;
                }
            }
        } catch (IOException ex) {
            // 赋予默认值
            ex.printStackTrace();
        }

        return macSerial;
    }

    /**
     * Android 7.0之后获取Mac地址
     * 遍历循环所有的网络接口，找到接口是 wlan0
     * 必须的权限 <uses-permission android:name="android.permission.INTERNET"></uses-permission>
     * @return
     */
    private String getMacFromHardware() {
        try {
            List<NetworkInterface> all = Collections.list(NetworkInterface.getNetworkInterfaces());
            for (NetworkInterface nif : all) {
                if (!nif.getName().equalsIgnoreCase("wlan0")) continue;

                byte[] macBytes = nif.getHardwareAddress();
                if (macBytes == null) {
                    return null;
                }

                StringBuilder res1 = new StringBuilder();
                for (byte b : macBytes) {
                    res1.append(String.format("%02X:", b));
                }

                if (res1.length() > 0) {
                    res1.deleteCharAt(res1.length() - 1);
                }
                return res1.toString();
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return null;
    }

    private String getMac() {
        String mac = "0";
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
            mac = getMacDefault(this);
        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && Build.VERSION.SDK_INT < Build.VERSION_CODES.N) {
            mac = getMacAddress();
        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            mac = getMacFromHardware();
        }
        if (mac == null || mac.equals("")) {
            mac = "0";
        }
        return mac;
    }

调用getMac()方法即可获取到各系统版本手机的mac地址。需要权限如下：

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