在 Worker 例程函数中等待 BroadcastReceiver 的返回值

问题描述

我用 Worker 做了一个 android 例程。该例程从设备获取一些信息，如下面的代码所示。我的问题是从广播中获取 wifi 列表并将其发送到例程。我尝试使用协程和内部函数广播，但没有任何工作可以将数据返回到工作程序

我的类DeviceInfo，收集数据的地方：

class DeviceInfo(private val context: Context) {

    private var listNetworkAvailable = mutablelistof<String>()

    // I'm trying to do with the broadcast a way to save and return the wifi list to be getted from my worker class
    suspend fun getCurrentScanResults(): MutableList<String> {
        val wifiManager = context.getSystemService(Context.WIFI_SERVICE) as? WifiManager ?: return mutablelistof()
        return suspendCancellableCoroutine { continuation ->
            val wifiScanReceiver = object : broadcastReceiver() {
                override fun onReceive(c: Context,intent: Intent) {
                    println("listNetworkAvailable start")
                    if (intent.action == WifiManager.ACTION_WIFI_NETWORK_SUGGESTION_POST_CONNECTION) {
                        context.unregisterReceiver(this)
                        for (i in (wifiManager.scanResults as MutableList<ScanResult>?)!!.indices) {

                            println("listNetworkAvailable")
                            println(listNetworkAvailable)
                            val ssid = (wifiManager.scanResults as MutableList<ScanResult>?)!![i].toString()
                                .split(",")[0].replace("SSID: ","")
                            if (ssid != "") {
                                listNetworkAvailable.add(ssid)
                            }
                        }
                        continuation.resume(listNetworkAvailable)
                    }
                }
            }
            continuation.invokeOnCancellation {
                context.unregisterReceiver(wifiScanReceiver)
            }
            context.registerReceiver(wifiScanReceiver,IntentFilter(WifiManager.ACTION_WIFI_NETWORK_SUGGESTION_POST_CONNECTION))
            wifiManager.startScan()
            println("device info wifiManager")
            println(wifiManager)
        }
    }

    val vpnConnected: Boolean
        get(){
            var result = false
            val cm = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager?
            cm?.run {
                cm.activeNetworkInfo?.run {
                    if (type == ConnectivityManager.TYPE_VPN) {
                        result = true
                    }
                }
            }
            return result
        }

    val wifiOr3G: String
        get(){
            try {
                var result = "none"
                //0 // Returns connection type. 0: none; 1: mobile data; 2: wifi; 3: VPN
                val cm = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager?
                cm?.run {
                    cm.getNetworkCapabilities(cm.activeNetwork)?.run {
                        if (hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) {
                            result = "Wifi"
                        } else if (hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)) {
                            result = "Mobile data"
                        }
                    }
                }
                return result
            } catch (e: Exception){
                return "Excecao disparada: $e";
            }
        }

    val networkClass: String
        get() {
            return try {
                val mTelephonyManager = context.getSystemService(Context.TELEPHONY_SERVICE) as TelephonyManager
                val networkType = mTelephonyManager.networkType
                when (networkType) {
                    TelephonyManager.NETWORK_TYPE_GPRS,TelephonyManager.NETWORK_TYPE_EDGE,TelephonyManager.NETWORK_TYPE_CDMA,TelephonyManager.NETWORK_TYPE_1xRTT,TelephonyManager.NETWORK_TYPE_IDEN -> NETWORK_TYPE_2G
                    TelephonyManager.NETWORK_TYPE_umts,TelephonyManager.NETWORK_TYPE_EVDO_0,TelephonyManager.NETWORK_TYPE_EVDO_A,TelephonyManager.NETWORK_TYPE_HSDPA,TelephonyManager.NETWORK_TYPE_HSUPA,TelephonyManager.NETWORK_TYPE_HSPA,TelephonyManager.NETWORK_TYPE_EVDO_B,TelephonyManager.NETWORK_TYPE_EHRPD,TelephonyManager.NETWORK_TYPE_HSPAP -> NETWORK_TYPE_3G
                    TelephonyManager.NETWORK_TYPE_LTE -> NETWORK_TYPE_4G
                    else -> NOT_FOUND_VAL
                }
            }catch (e: Exception){
                "Excecao disparada: $e";
            }
        }
}

我需要数据的工人阶级： class Process(appContext: Context,workerParams: WorkerParameters) : Worker(appContext,workerParams) {

    override fun doWork(): Result {

        //The getCurrentScanResults() element is the one I need to get correctly

        val json = """{
            "network": {
                "available_wifi_list": """+DeviceInfo(applicationContext).getCurrentScanResults()+""","vpn_connected": """"+DeviceInfo(applicationContext).vpnConnected.toString()+"""","type": """"+DeviceInfo(applicationContext).wifiOr3G+"""","class": """"+DeviceInfo(applicationContext).networkClass+""""
            }
        }"""
        sendToServer(json)
        return Result.success()
    }
}

解决方法

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