Android6.0系统获getMacAddress（）取Wifi和蓝牙Mac地址返回02:00:00:00:00:00解决办法

在做用户信息统计时，发现 安卓6.0系统用户返回的Mac地址都是 02:00:00:00:00:00，被误判为作弊用户，实际上是谷歌在6.0及以后版本对获取wifi及蓝牙MacAddress 做的改动。

Most notably, Local WiFi and Bluetooth MAC addresses are no longer available. The getMacAddress() method of a WifiInfo object and the BluetoothAdapter.getDefaultAdapter().getAddress() method will both return 02:00:00:00:00:00 from now on.

也就是早先的：

WifiManager wifiManager=(WifiManager) getSystemService(Context.WIFI_SERVICE);
WifiInfo wifiInfo=wifiManager.getConnectionInfo();
String mac=wifiInfo.getMacAddress();

方法在安卓6.0系统上获取到的Mac 都是 02:00:00:00:00:00。刚开始以为权限不够，但权限都给了之后还是获取到02：00信息，说明不是权限问题。查寻资料还可以通过获取设备网络设备信息的API—— NetworkInterface.getNetworkInterfaces() 去获取。

Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
while (interfaces.hasMoreElements()) {
    NetworkInterface iF = interfaces.nextElement();

    byte[] addr = iF.getHardwareAddress();
    if (addr == null || addr.length == 0) {
        continue;
    }

    StringBuilder buf = new StringBuilder();
    for (byte b : addr) {
        buf.append(String.format("%02X:", b));
    }
    if (buf.length() > 0) {
        buf.deleteCharAt(buf.length() - 1);
    }
    String mac = buf.toString();
    Log.d("---mac", "interfaceName="+iF.getName()+", mac="+mac);
}

用 Genymotion 虚拟机运行的6.0系统，打印如下：

---mac: interfaceName=eth0, mac=08:00:27:75:9A:98
---mac: interfaceName=eth1, mac=08:00:27:DF:43:CA
---mac: interfaceName=ifb0, mac=BE:98:32:22:9A:51
---mac: interfaceName=ifb1, mac=7A:E0:26:3E:8D:D3

获取一个属性的Mac 地址如下：

public static String getMacAddress(Context context) {
//该方法在6.0 系统 不再开发，返回 02:00:00:00:00:00


        if (isAccessWifiStateAuthorized(context)) {
            WifiManager wifiMgr = (WifiManager) context
                    .getSystemService(Context.WIFI_SERVICE);
            WifiInfo wifiInfo = wifiMgr.getConnectionInfo();
        Log.i("----getMacAddress--0--", "" + wifiInfo.getMacAddress());
        } else {


        }


        String macAddress = null;
        StringBuffer buf = new StringBuffer();
        NetworkInterface networkInterface = null;
        try {
            networkInterface = NetworkInterface.getByName("eth1");
            if (networkInterface == null) {
                networkInterface = NetworkInterface.getByName("wlan0");
            }
            if (networkInterface == null) {
                return "02:00:00:00:00:02";
            }
            byte[] addr = networkInterface.getHardwareAddress();




            for (byte b : addr) {
                buf.append(String.format("%02X:", b));
            }
            if (buf.length() > 0) {
                buf.deleteCharAt(buf.length() - 1);
            }
            macAddress = buf.toString();
        } catch (SocketException e) {
            e.printStackTrace();
            return "02:00:00:00:00:02";
        }
        Log.i("----getMacAddress--1--", "" + buf.toString());
        return macAddress;
    }

可以通过 运行各版本手机的方法 对比测试

networkInterface = NetworkInterface.getByName("wlan0");  
来确定getByName 为哪个name 。

蓝牙Mac地址获取：

/**
 * 获取Mac地址
 */
public class MacUtils {


/**
 * 获取手机的MAC地址
 * 
 * @return
 */
public static String getMac() {
String str = "";
String macSerial = "";
try {
Process pp = Runtime.getRuntime().exec(
"cat /sys/class/net/wlan0/address ");
InputStreamReader ir = new InputStreamReader(pp.getInputStream());
LineNumberReader input = new LineNumberReader(ir);

for (; null != str;) {
str = input.readLine();
if (str != null) {
macSerial = str.trim();// 去空格
break;
}
}
} catch (Exception ex) {
ex.printStackTrace();
}
if (macSerial == null || "".equals(macSerial)) {
try {
return loadFileAsString("/sys/class/net/eth0/address")
.toUpperCase().substring(0, 17);
} catch (Exception e) {
e.printStackTrace();

}

}
return macSerial;
}

public static String loadFileAsString(String fileName) throws Exception {
FileReader reader = new FileReader(fileName);
String text = loadReaderAsString(reader);
reader.close();
return text;
}

public static String loadReaderAsString(Reader reader) throws Exception {
StringBuilder builder = new StringBuilder();
char[] buffer = new char[4096];
int readLength = reader.read(buffer);
while (readLength >= 0) {
builder.append(buffer, 0, readLength);
readLength = reader.read(buffer);
}
return builder.toString();
}

}

进行蓝牙相关操作要在AndroidManifest 进行蓝牙权限声明：

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

但通过4.4系统发现通过上面方法打印的结果 和 通过

 BluetoothManager bluetoothManager =
                (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
        BluetoothAdapter mBluetoothAdapter = bluetoothManager.getAdapter();
        String addressStr = mBluetoothAdapter.getAddress();

不太一样， 通过MacUtils 打印的 abcdef 都是小写字母， 通过getAddress 获得的是 大写字母，不过都是为了区分唯一性没有影响。