code: protected static String getDeviceName() {
          try {
              if (WonderPush.getApplicationContext().getPackageManager().checkPermission(android.Manifest.permission.BLUETOOTH, WonderPush.getApplicationContext().getPackageName()) == PackageManager.PERMISSION_GRANTED) {
                  BluetoothAdapter btDevice = BluetoothAdapter.getDefaultAdapter();
                  return btDevice.getName();
              }
          } catch (Exception ex) {
              // Ignore
          }
          return null;
      }
docs: Returns the Bluetooth device name, if permissions are granted,
  and provided the device actually has Bluetooth.