多个信标消费者和信标未使用AltBeacon进行检测

Question

我在我的一个android项目中使用altbeacon库。在该项目中，Beaconsumer已经在其中一项活动中实现。当我尝试在我的代码部分实现信标检测时，信标是不检测的。

但是，当我从之前编写的代码中删除Beaconsumer代码时，我的代码就会工作并检测到信标。

这是信标未检测到时的日志。为什么有多个消费者，这是问题所在吗？如果是，如何删除多个消费者。

I/System.out: ---------onBeaconServiceConnect
D/BeaconParser: Parsing beacon layout: m:2-3=beac,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25
D/BeaconParser: Parsing beacon layout: x,s:0-1=feaa,m:2-2=20,d:3-3,d:4-5,d:6-7,d:8-11,d:12-15
D/BeaconParser: Parsing beacon layout: s:0-1=feaa,m:2-2=00,p:3-3:-41,i:4-13,i:14-19
D/BeaconParser: Parsing beacon layout: s:0-1=feaa,m:2-2=10,p:3-3:-41,i:4-20v
D/BeaconParser: Parsing beacon layout: m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24
D/BeaconLocalBroadcastProcessor: Register calls: global=6 instance=6
D/BeaconLocalBroadcastProcessor: Register calls: global=7 instance=7
D/BeaconManager: consumer count is now: 2
D/BeaconManager: This consumer is not bound.  Binding now: MainActivity@11b9235
D/BeaconManager: Not starting beacon scanning service. Using scheduled jobs
D/BeaconLocalBroadcastProcessor: Register calls: global=8 instance=8
D/BeaconManager: consumer count is now: 3
D/BeaconManager: Unbinding
D/BeaconManager: Not unbinding from scanning service as we are using scan jobs.
D/BeaconManager: Before unbind, consumer count is 3
D/BeaconManager: After unbind, consumer count is 2

这是我正在使用的类

class BeaconsDataSource(private val context: Context) : BeaconConsumer, RangeNotifier,MonitorNotifier {
private val beaconManager: BeaconManager =
BeaconManager.getInstanceForApplication(context)
private val region = Region("myRegion", null, null, null)
private lateinit var data: Step
private var listener: ((Step) -> Unit)? = null
override fun getApplicationContext(): Context = context
override fun unbindService(p0: ServiceConnection?) {
applicationContext.unbindService(p0!!)
}
override fun bindService(p0: Intent?, p1: ServiceConnection?, p2: Int): Boolean {

return applicationContext.bindService(p0, p1!!, p2)
}
override fun onBeaconServiceConnect() {
BeaconManager.setDebug(true)
beaconManager.beaconParsers
.add(BeaconParser().setBeaconLayout("m:2-3=beac,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25"))
beaconManager.beaconParsers
.add(BeaconParser().setBeaconLayout("x,s:0-1=feaa,m:2-2=20,d:3-3,d:4-5,d:6-7,d:8-11,d:12-15"))
beaconManager.beaconParsers
.add(BeaconParser().setBeaconLayout("s:0-1=feaa,m:2-2=00,p:3-3:-41,i:4-13,i:14-19"))
beaconManager.beaconParsers.add(BeaconParser().setBeaconLayout("s:0-1=feaa,m:2-2=10,p:3-3:-41,i:4-20v"))
beaconManager.beaconParsers
.add(BeaconParser().setBeaconLayout("m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24"))

beaconManager.removeAllMonitorNotifiers()
beaconManager.removeAllRangeNotifiers()
beaconManager.addMonitorNotifier(this)
beaconManager.addRangeNotifier(this)
try {
beaconManager.startMonitoringBeaconsInRegion(region)
beaconManager.startRangingBeaconsInRegion(region)
} catch (e: RemoteException) {
e.printStackTrace()
}
}
override fun didRangeBeaconsInRegion(p0: MutableCollection<Beacon>, p1: Region?) {

data = Step.ENTER_NUMBER
notifyListeners()
}
private fun notifyListeners() {
listener?.invoke(data)
}

fun requestBeaconsUpdate(listener: (Step) -> Unit) {
this.listener = listener
beaconManager.bind(this)
}
fun stopBeaconsUpdate() {       
beaconManager.unbind(this)
}
override fun didDetermineStateForRegion(p0: Int, p1: Region?) {
val msg = "---------did determine state for region $p0"
Log.d("TAG", msg)
}

override fun didEnterRegion(p0: Region?) {
val msg = "-----------did enter region"
val zone = p0.toString()
Log.d("TAG", "----------Enter in region")
val text = "Enter in $zone"
Log.d("TAG", msg)
}
override fun didExitRegion(p0: Region?) {
val msg = "------------did exit region"
Log.d("TAG", msg)
}
}

这是我从viewmodel 调用的livedata类

class BeaconsLiveData() : LiveData<Step>() {
private val beaconDataSource = BeaconsDataSource(App.getAppContext())
private val listener = { data: Step ->
value = data

}
override fun onActive() {
super.onActive()
beaconDataSource.requestBeaconsUpdate(listener)
}
override fun onInactive() {
super.onInactive()
beaconDataSource.stopBeaconsUpdate()
}
} 

Answer 1

很难说是什么导致了多次绑定操作，但这可能会导致检测问题。我怀疑这与LiveData生命周期有关。不幸的是，调试它比(对我来说(查看代码片段可能涉及的更多。

通常，您应该设计系统，使其不频繁地调用beaconManager.bind(...)和.unbind(...)。这样做经常会导致问题，因为它会启动和停止服务，这是一种很重的机制。

我确实在这里创建了一个可工作的Kotlin示例应用程序，以防对您有所帮助。此示例演示了使用MutableLiveData共享来自对"活动"进行检测的中心类的信标检测数据。本例中的中心类是一个Android应用程序类，但它也可以是任何具有长生命周期的单例。关键是，它在启动时会调用bind(...)一次，在您完成信标工作之前不会再调用它。