Question

我正在使用RxAndroidBle做一个可作为呼吸机遥控器的应用程序。我对unsubscribe有疑问，因为当我使用

时

.flatMap(rxBleConnection -> rxBleConnection.writeCharacteristic(Uuids.UUID_RX, flaktCommandConcat.getBytes()))

之后我使用subscription.unsubscribe(); writeCharacteristics不起作用，因为unsubscribe始终先运行，连接在数据发送之前断开连接。

我需要的是：

当我点击我要连接到呼吸机的按钮时
然后发送所有值
然后断开连接。
如果我重复这个程序，就需要一遍又一遍地做同样的事情。

有人可以帮助我一些想法吗？我尝试使用.delay(1000, Time.MILISECONDS)并且它有效，但需要很长时间才能将信息发送到呼吸机。

这是我的代码：

 public void writeRxCharacteristics(String flaktCommandConcat){

    rxBleDevice = rxBleClient.getBleDevice(Uuids.DEVICE_ADDRESS);


    subscription = rxBleDevice.establishConnection(true) //false
            .observeOn(AndroidSchedulers.mainThread())
            .flatMap(rxBleConnection -> rxBleConnection.createNewLongWriteBuilder()
            .setCharacteristicUuid(Uuids.UUID_RX)
            .setBytes(flaktCommandConcat.getBytes())
            .build())

            .subscribe(
                    byteArray -> {
                        Log.d("CharacteristicValue","WRITE: " + Arrays.toString(byteArray));
                    },

                    throwable -> {
                        Log.d("CharacteristicValue","Throwable: " + throwable.toString());
                        rxBleActivity.onScanFailure(throwable, getContext());
                    }
            );


    rxBleDevice.observeConnectionStateChanges()
            .observeOn(AndroidSchedulers.mainThread())
            .delay(1000, TimeUnit.MILLISECONDS)
            .subscribe(
                    rxBleConnectionState -> {
                        Log.d("RxBleConnectionState", " CON_STATUS: " + rxBleConnectionState);
                        disconnect();

                    },
                    throwable -> {
                        Log.d("ConnectionStateChanges","Throwable: " + throwable.toString());

                    }
            );
}
public void disconnect() {
if (subscription != null && !subscription.isUnsubscribed()) {
subscription.unsubscribe();
subscription = null;
}
Log.d("CONNECTION2", " CON_STATUS: " + rxBleDevice.getConnectionState().toString());
}

Answer 1

看起来你不需要长写。您的数据是否超过20个字节？

无论如何，当Observable<RxBleConnection>取消订阅时，库会释放连接。如果我是你，我会做的是：

public void writeRxCharacteristics(String flaktCommandConcat){
    rxBleDevice = rxBleClient.getBleDevice(Uuids.DEVICE_ADDRESS);

    rxBleDevice.establishConnection(true) //false
            .flatMap(rxBleConnection -> rxBleConnection.createNewLongWriteBuilder()
                .setCharacteristicUuid(Uuids.UUID_RX)
                .setBytes(flaktCommandConcat.getBytes())
                .build()
            )
            .take(1)
            .observeOn(AndroidSchedulers.mainThread())
            .subscribe(
                    byteArray -> {
                        Log.d("CharacteristicValue","WRITE: " + Arrays.toString(byteArray));
                    },

                    throwable -> {
                        Log.d("CharacteristicValue","Throwable: " + throwable.toString());
                        rxBleActivity.onScanFailure(throwable, getContext());
                    }
            );

请确保你没有过度使用长写。它在1.2.0中有一个已知错误（无关），最近在1.3.0-SNAPSHOT中修复。

取消订阅的问题

1 个答案: