Get Bluetooth local mac address in Marshmallow

Question

Pre Marshmallow my app would obtain it\'s device MAC address via BluetoothAdapter.getDefaultAdapter().getAddress().

Now with Marshmallow Android is retu

Answer 1

Please use the below code to get the bluetooth mac address. let me know if any issues.

private String getBluetoothMacAddress() {
    BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
    String bluetoothMacAddress = "";
    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M){
        try {
            Field mServiceField = bluetoothAdapter.getClass().getDeclaredField("mService");
            mServiceField.setAccessible(true);

            Object btManagerService = mServiceField.get(bluetoothAdapter);

            if (btManagerService != null) {
                bluetoothMacAddress = (String) btManagerService.getClass().getMethod("getAddress").invoke(btManagerService);
            }
        } catch (NoSuchFieldException e) {

        } catch (NoSuchMethodException e) {

        } catch (IllegalAccessException e) {

        } catch (InvocationTargetException e) {

        }
    } else {
        bluetoothMacAddress = bluetoothAdapter.getAddress();
    }
    return bluetoothMacAddress;
}

Answer 2

Getting the MAC address via reflection can look like this:

private static String getBtAddressViaReflection() {
    BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
    Object bluetoothManagerService = new Mirror().on(bluetoothAdapter).get().field("mService");
    if (bluetoothManagerService == null) {
        Log.w(TAG, "couldn't find bluetoothManagerService");
        return null;
    }
    Object address = new Mirror().on(bluetoothManagerService).invoke().method("getAddress").withoutArgs();
    if (address != null && address instanceof String) {
        Log.w(TAG, "using reflection to get the BT MAC address: " + address);
        return (String) address;
    } else {
        return null;
    }
}

using a reflection library (net.vidageek:mirror) but you'll get the idea.

Answer 3

Access to the mac address has been deliberately removed:

To provide users with greater data protection, starting in this release, Android removes programmatic access to the device’s local hardware identifier for apps using the Wi-Fi and Bluetooth APIs.

(from Android 6.0 Changes)

Answer 4

Worked great

 private String getBluetoothMacAddress() {
        BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        String bluetoothMacAddress = "";
        try {
            Field mServiceField = bluetoothAdapter.getClass().getDeclaredField("mService");
            mServiceField.setAccessible(true);

            Object btManagerService = mServiceField.get(bluetoothAdapter);

            if (btManagerService != null) {
                bluetoothMacAddress = (String) btManagerService.getClass().getMethod("getAddress").invoke(btManagerService);
            }
        } catch (NoSuchFieldException | NoSuchMethodException | IllegalAccessException | InvocationTargetException ignore) {

        }
        return bluetoothMacAddress;
    }

Answer 5

You can access Mac address from the file "/sys/class/net/" + networkInterfaceName+ "/address" ,where networkInterfaceName can be wlan0 or eth1.But Its permission may be read-protected,so it may not work in some devices. I am also attaching the code part which i got from SO.

public static String getWifiMacAddress() {
        try {
            String interfaceName = "wlan0";
            List<NetworkInterface> interfaces = Collections
                    .list(NetworkInterface.getNetworkInterfaces());
            for (NetworkInterface intf : interfaces) {
                if (!intf.getName().equalsIgnoreCase(interfaceName)) {
                    continue;
                }

                byte[] mac = intf.getHardwareAddress();
                if (mac == null) {
                    return "";
                }

                StringBuilder buf = new StringBuilder();
                for (byte aMac : mac) {
                    buf.append(String.format("%02X:", aMac));
                }
                if (buf.length() > 0) {
                    buf.deleteCharAt(buf.length() - 1);
                }
                return buf.toString();
            }
        } catch (Exception exp) {

            exp.printStackTrace();
        } 
        return "";
    }

Answer 6

zmarties is right but you can still get the mac address via reflection or Settings.Secure:

  String macAddress = android.provider.Settings.Secure.getString(context.getContentResolver(), "bluetooth_address");