從Android6.0開始，通過BluetoothAdapter.getDefaultAdapter().getAddress()獲取的地址是一個固定值02:00:00:00:00:00，部分從低版本升級到6.0的手機也還是可以獲取真實的MAC地址的。下面通過反射的方式

獲取藍芽地址：

public static String getBtAddressByReflection() {
        BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        Field field = null;
        try {
            field = BluetoothAdapter.class.getDeclaredField("mService");
            field.setAccessible(true);
            Object bluetoothManagerService = field.get(bluetoothAdapter);
            if (bluetoothManagerService == null) {
                return null;
            }
            Method method = bluetoothManagerService.getClass().getMethod("getAddress");
            if(method != null) {
               Object obj = method.invoke(bluetoothManagerService);
               if(obj != null) {
                    return obj.toString();
               }
            }
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }
        return null;
    }