How to get the address/name of connected Bluetooth device - Android

I need to get the CONNECTED device name and address.

This is what I have tried so far and with it I'm able to get the paired devices list and addresses.

public class MainActivity extends AppCompatActivity {

  TextView mBlue;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mBlue = (TextView) findViewById(R.id.Bluetooth);

    String s = " ";
    BluetoothAdapter ba = BluetoothAdapter.getDefaultAdapter();

    Set <BluetoothDevice> devices = ba.getBondedDevices();

    if (ba != null) {
      for (BluetoothDevice device: devices)
        s += device.getName() + "-" + device.getAddress() + "\n";
    } else
      s += "No address";

    mBlue.setText(s.toString());
  }
}

How to get the device address/name of connected Bluetooth device?

Please help me out with a clear code (both manifest and class code). I have seen other posts on SO but I can't make it out. Please help to solve this.