android - 在 Android 手机上检测 5G 连接

Question

我正在尝试识别蜂窝网络连接的类型。我使用了不同的方法，例如建议的方法 here ，但结果是我在配备 Android 10 和 5G 连接的三星上不断获得 4G。如何读取正确的网络类型？

private fun getNetworkType(telephonyManager: TelephonyManager): String {
    return when (telephonyManager.networkType) {
        TelephonyManager.NETWORK_TYPE_UNKNOWN -> "unknown"

        TelephonyManager.NETWORK_TYPE_GPRS,
        TelephonyManager.NETWORK_TYPE_EDGE,
        TelephonyManager.NETWORK_TYPE_CDMA,
        TelephonyManager.NETWORK_TYPE_1xRTT,
        TelephonyManager.NETWORK_TYPE_IDEN,
        TelephonyManager.NETWORK_TYPE_GSM -> "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,
        TelephonyManager.NETWORK_TYPE_TD_SCDMA -> "3G"

        TelephonyManager.NETWORK_TYPE_LTE,
        TelephonyManager.NETWORK_TYPE_IWLAN -> "4G"

        TelephonyManager.NETWORK_TYPE_NR -> "5G"

        else -> "something else"
    }
}

private fun getRadioTechnology(telephonyManager: TelephonyManager): String {
    try {
        val obj = Class.forName(telephonyManager.javaClass.name)
                .getDeclaredMethod("getServiceState", *arrayOfNulls(0)).invoke(telephonyManager, *arrayOfNulls(0))
        val methods: Array<Method> = Class.forName(obj.javaClass.name).declaredMethods
        for (method in methods) {
            if (method.name == "getRadioTechnology" ) {
                method.isAccessible = true
                val radioTechnology = (method.invoke(obj) as Int).toInt()
                return "$radioTechnology"
            }
        }
    } catch (e: Exception) {
        Log.e("Test5G", "", e)
    }
    return ""
}

@SuppressLint("MissingPermission")
fun getActiveSubscriptionInfoList(): String {
    val subscriptionInfos = SubscriptionManager.from(this).activeSubscriptionInfoList
    var ret: String = ""
    for(sub in subscriptionInfos) {
        val id = sub.subscriptionId
        val telephonyManager = telephonyManager.createForSubscriptionId(id);
        ret += getRadioTechnology(telephonyManager)
    }
    return ret
}

Answer 1

我是这样做的:

telephonyManager.listen(object : PhoneStateListener() {
    override fun onServiceStateChanged(serviceState: ServiceState) {
        val isNrAvailable = serviceState.toString().isNrAvailable()
        // use isNrAvailable
    }
}, PhoneStateListener.LISTEN_SERVICE_STATE)

在哪里

fun String.isNrAvailable() =
        contains("nrState=CONNECTED") ||
        contains("nsaState=5"))