Question

我是RxJava和RxAndroidBle的新手，希望能为我要解决的问题提供帮助。本质上，我有一个BLE设备，该设备具有四个特征。这些可观察对象发出的数据被合并为一个可观察对象：

private RxBleDevice mBleDevice;
private Disposable mConnectionSubscription;

...

mConnectionSubscription = mBleDevice.establishConnection(false)
        .flatMap(rxBleConnection -> Observable.combineLatest(
                rxBleConnection.setupNotification(UUID.fromString(CHARACTERISTIC_UUID0)).flatMap(observable -> observable),
                rxBleConnection.setupNotification(UUID.fromString(CHARACTERISTIC_UUID1)).flatMap(observable -> observable),
                rxBleConnection.setupNotification(UUID.fromString(CHARACTERISTIC_UUID2)).flatMap(observable -> observable),
                rxBleConnection.setupNotification(UUID.fromString(CHARACTERISTIC_UUID3)).flatMap(observable -> observable),
                MyDataClass::new
        ))
        .observeOn(AndroidSchedulers.mainThread())
        .doFinally(this::disconnect)
        .subscribe(
                myData -> {
                    this.onNotificationReceived(myData);
                },
                this::onNotificationSetupFailure
        );

其中：

public class MyDataClass<Data0, Data1, Data2, Data3> {
    ...

    public MyDataClass(Data0 data0, Data1 data1, Data2 data2, Data3 data3) {
        ...
    }
}

以上工作正常。我试图做的是订阅另一个特征。但是，这只会偶尔发出数据。因此，我想将此额外的Observable连接到单独的观察者（例如onNotificationReceived2）。我不希望这些额外的可观察数据与MyDataClass相关。我该怎么办？

Answer 1

在您的mydf %>% set_names(paste0("V", seq_along(.))) %>% mutate(V4 = abs(V2 - as.numeric(V1)))之前，插入： flatMap() 然后使用.doOnNext( rxBleConnection -> savedConnection = rxBleConnection )设置您的其他订阅。

当您处置（或丢失）原始连接时，请不要忘记将savedConnection设为空。

Answer 2

我找到了我想要的解决方案。根据{{3}}和罗伯特·刘易斯的评论，我最终做了以下事情：

private RxBleDevice mBleDevice;
private Disposable mConnectionSubscription1;
private Disposable mConnectionSubscription2;

...

Observable<RxBleConnection> sharedConnectionObservable = mBleDevice.establishConnection(false)
        .replay(1).refCount();

mConnectionSubscription1 = sharedConnectionObservable
        .flatMap(rxBleConnection -> Observable.combineLatest(
                rxBleConnection.setupNotification(UUID.fromString(CHARACTERISTIC_UUID0)).flatMap(observable -> observable),
                rxBleConnection.setupNotification(UUID.fromString(CHARACTERISTIC_UUID1)).flatMap(observable -> observable),
                rxBleConnection.setupNotification(UUID.fromString(CHARACTERISTIC_UUID2)).flatMap(observable -> observable),
                rxBleConnection.setupNotification(UUID.fromString(CHARACTERISTIC_UUID3)).flatMap(observable -> observable),
                MyDataClass::new
        ))
        .observeOn(AndroidSchedulers.mainThread())
        .doFinally(this::disconnect)
        .subscribe(
                myData -> {
                    this.onNotificationReceived(myData);
                },
                this::onNotificationSetupFailure
        );

mConnectionSubscription2 = sharedConnectionObservable
        .flatMap(rxBleConnection -> rxBleConnection.setupNotification(UUID.fromString(CHARACTERISTIC_UUID4)).flatMap(observable -> observable))
        .observeOn(AndroidSchedulers.mainThread())
        .doFinally(this::disconnect)
        .subscribe(
                myData2 -> {
                    this.onNotificationReceived2(myData2);
                },
                this::onNotificationSetupFailure
        );

RxAndroidBle：单独的订户

2 个答案: