应用程序退出时断开蓝牙套接字

Question

即时通讯使用此代码我想在应用程序退出时断开蓝牙，但当应用程序退出时，套接字仍然连接到蓝牙设备。我认为＆＃34;取消＆＃34;线程在代码中不起作用。我该怎么做才能断开它？在此先感谢

 public class ConnectToBluetooth implements Runnable{
  private BluetoothDevice btShield;
  private BluetoothSocket mySocket = null;
  private UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");

  public ConnectToBluetooth(BluetoothDevice bluetoothShield) {
  btShield = bluetoothShield;
  try{
  mySocket = btShield.createRfcommSocketToServiceRecord(uuid);
  }catch(IOException createSocketException){
  //Problem with creating a socket
  }
  }

  @Override
  public void run() {
  /* Cancel discovery on Bluetooth Adapter to prevent slow connection */
  bluetooth.cancelDiscovery();

  try{
  /*Connect to the bluetoothShield through the Socket. This will block
  until it succeeds or throws an IOException */
  mySocket.connect();
  } catch (IOException connectException){
  try{
  mySocket.close(); //try to close the socket
  }catch(IOException closeException){
  }
  return;
  }
  }

  /* Will cancel an in-progress connection, and close the socket */
  public void cancel() {
  try {
  mySocket.close();
  } catch (IOException e){
  }
  }
 }