Implementation method of Android programming to obtain device MAC address

/**
 * Get the device's mac address
 *
 * @param ac
 * @param callback
 * This method will be called back after successfully obtaining the mac address
 */
public static void getMacAddress(final Activity ac, final SimpleCallback callback) {
    final WifiManager wm = (WifiManager) ac .getSystemService(Service.WIFI_SERVICE);
    // If you turn on WIFI after booting this time, you can directly obtain the Mac information.  Return the data immediately.    WifiInfo info = ();
    if (info != null && () != null) {
      if (callback != null) {
        (());
      }
      return;
    }
    // Try to open WIFI and get the mac address    if (!()) {
      (true);
    }
    new Thread(new Runnable() {
      @Override
      public void run() {
        int tryCount = 0;
        final int MAX_COUNT = 10;
        while (tryCount < MAX_COUNT) {
          final WifiInfo info = ();
          if (info != null && () != null) {
            if (callback != null) {
              (new Runnable() {
                @Override
                public void run() {
                  (());
                }
              });
            }
            return;
          }
          (300);
          tryCount++;
        }
        // The mac address was not obtained        if (callback != null) {
          (null);
        }
      }
    }).start();
}

public interface SimpleCallback {
  void onComplete(String result);
}