如何在配置更改时通过蓝牙保存连接？

Question

我有一个Fragment，其中我引用了BluetoothConnection类。在BluetoothConnection我处理通过其他蓝牙设备连接所需的所有内容。所有工作正常，但当我旋转我的设备连接消失。那么如何保存配置更改的连接？我用片段作为setRetainInstance(true)方法阅读，但它只跳过onCreate方法。我知道我可以将所有BluetoothConnection移到Service但我认为这不是一个好的解决方案。这是我的代码：

private BluetoothConnection connection = null;

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setHasOptionsMenu(true);

        Log.d(TAG, "onCreate");

        //setRetainInstance(true);

        adapter = BluetoothAdapter.getDefaultAdapter();

        // If the adapter is null, then Bluetooth is not supported
        if (adapter == null) {
            FragmentActivity activity = getActivity();
            Toast.makeText(activity, "Bluetooth is not available", Toast.LENGTH_LONG).show();
            activity.finish();
        }
        bindService();
    }

    @Override
    public void onStart() {
        super.onStart();
        // If BT is not on, request that it be enabled.
        // setupChat() will then be called during onActivityResult
        if (!adapter.isEnabled()) {
            Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
            // Otherwise, setup the chat session
        } else if (connection == null) {
            setupChat();
        }
        Log.d(TAG, "onStart");
    }
 private void setupChat() {
        if(!isConnected){
            button.setEnabled(false);
        }

        command = new CommandFormatter();
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                boolean turnOn = ((ToggleButton) v).isChecked();
                if (isConnected) {
                    if (turnOn) {
                        formatCommand("On");
                        sendCommand(command.generateXML());
                    } else {
                        formatCommand("Off");
                        sendCommand(command.generateXML());
                        //isConnected = false;
                    }
                }
            }
        });
        // Initialize the BluetoothChatService to perform bluetooth connections
        connection = new BluetoothConnection(handler);
    }