Question

目前正在修改sample code，我在尝试建立连接然后在一个活动中读取特征时遇到错误。

我在尝试从设备读取时收到BleAlreadyConnectedException。我首先连接onCreate。

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

    // How to listen for connection state changes
    bleDevice.observeConnectionStateChanges()
            .compose(bindUntilEvent(DESTROY))
            .observeOn(AndroidSchedulers.mainThread())
            .subscribe(this::onConnectionStateChange);

    if (isConnected()) {
        triggerDisconnect();
    } else {
        connectionSubscription = bleDevice.establishConnection(this, true)
                .compose(bindUntilEvent(PAUSE))
                .observeOn(AndroidSchedulers.mainThread())
                .doOnUnsubscribe(this::clearSubscription)
                .subscribe(this::onConnectionReceived, this::onConnectionFailure);
    }
}

然后尝试读取onConnectionReceived中的特征......

    private void onConnectionReceived(RxBleConnection connection) { 
    Log.d(TAG, "onConnectionReceived");
    connectionObservable = bleDevice
            .establishConnection(this, false)
            .takeUntil(disconnectTriggerSubject)
            .compose(bindUntilEvent(PAUSE))
            .doOnUnsubscribe(this::clearSubscription)
            .compose(new ConnectionSharingAdapter());

    if (isConnected()) {
        connectionObservable
                .flatMap(rxBleConnection -> rxBleConnection.readCharacteristic(uuid))
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(bytes -> {
                    Log.d(TAG, "onConnectionReceived:" + bytes);
                }, this::onReadFailure);
    }
}

你如何使用ConnectionSharingAdapter处理double .establishConnection（this，false）？

Answer 1

事情是你连接两次。你应该宁愿：

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

  // How to listen for connection state changes
  bleDevice.observeConnectionStateChanges()
    .compose(bindUntilEvent(DESTROY))
    .observeOn(AndroidSchedulers.mainThread())
    .subscribe(this::onConnectionStateChange);

  connectionObservable = bleDevice.establishConnection(this, true)
    .compose(bindUntilEvent(PAUSE))
    .takeUntil(disconnectTriggerSubject)
    .subscribeOn(Schedulers.io())
    .observeOn(AndroidSchedulers.mainThread())
    .doOnUnsubscribe(this::clearSubscription)
    .compose(new ConnectionSharingAdapter());

  if (isConnected()) {
      triggerDisconnect();
  } else {
      connectionObservable.subscribe(this::onConnectionReceived, this::onConnectionFailure);
  }
}

private void onConnectionReceived(RxBleConnection connection) { 
  Log.d(TAG, "onConnectionReceived");
  connection
    .flatMap(rxBleConnection -> rxBleConnection.readCharacteristic(uuid))
    .subscribeOn(Schedulers.io())
    .observeOn(AndroidSchedulers.mainThread())
    .subscribe(bytes -> {
        Log.d(TAG, "onValueReceived:" + bytes);
    }, this::onReadFailure);
}

完整的示例是here。

如何在一个活动中建立连接然后读取特征？

1 个答案: