API 29环境下5G（Nr）CellIdentityNr/CellSignalNr参数获取失败排查

我曾通过相关命令在3G、4G环境中成功获取所需的蜂窝网络参数，但在5G（Nr）环境下该方法失效，API版本已更新至29。相关代码如下：

private fun getCellInfo(cellInfo: CellInfo): HashMap<Any?, String?> {
    var netclass = getNetworkClass()
    Log.d("MyActivity", netclass)
    var map = hashMapOf<Any?, String?>()
    if (cellInfo is CellInfoGsm) {
        val cellIdentityGsm = cellInfo.cellIdentity
        val cellSignalGsm = cellInfo.cellSignalStrength
        map["cell_identity"] = cellIdentityGsm.cid.toString()
        map["MCC"] = cellIdentityGsm.mcc.toString()
        map["MNC"] = cellIdentityGsm.mnc.toString()
        map["LAC"] = cellIdentityGsm.lac.toString()
        map["RSSI"] = cellSignalGsm.dbm.toString()
        map["RxLev"] = cellSignalGsm.asuLevel.toString()
        map["Level_of_strength"] = cellSignalGsm.level.toString()
        map["type"] = "2"
    } else if (cellInfo is CellInfoLte) {
        val cellIdentityLte = cellInfo.cellIdentity
        val cellSignalStrengthLte = cellInfo.cellSignalStrength
        map["cell_identity"] = cellIdentityLte.ci.toString()
        map["MCC"] = cellIdentityLte.mcc.toString()
        map["MNC"] = cellIdentityLte.mnc.toString()
        map["TAC"] = cellIdentityLte.tac.toString()
        map["RSRP"] = cellSignalStrengthLte.rsrp.toString()
        map["RSRQ"] = cellSignalStrengthLte.rsrq.toString()
        map["Level_of_strength"] = cellSignalStrengthLte.level.toString()
        map["type"] = "4"
    } else if (cellInfo is CellInfoWcdma) {
        val cellIdentityWcdma = cellInfo.cellIdentity
        val cellSignalWcdma = cellInfo.cellSignalStrength
        map["cell_identity"] = cellIdentityWcdma.cid.toString()
        map["MCC"] = cellIdentityWcdma.mcc.toString()
        map["MNC"] = cellIdentityWcdma.mnc.toString()
        map["LAC"] = cellIdentityWcdma.lac.toString()
        map["RSCP"] = cellSignalWcdma.dbm.toString()
        map["Level_of_strength"] = cellSignalWcdma.level.toString()
        map["type"] = "3"
    } else if (cellInfo is CellInfoNr) {
        val cellIdentityNr = cellInfo.cellIdentity
        val cellSignalStrengthNr = cellInfo.cellSignalStrength
        map["cell_identity"] = cellIdentityNr.Nci.toString() //wrong here
        map["RSRP"] = cellSignalStrengthNr.asuLevel.toString()
    }
    map["net_type"] = netclass
    map["plmn"] = tm.getNetworkOperator().toString()
    return map
}

问题分析与修正 #

你的5G参数获取逻辑存在3个关键问题：

1. 属性名大小写错误
   Kotlin遵循小驼峰命名规范，Android SDK中CellIdentityNr的小区标识属性是小写开头的nci，而非大写开头的Nci，直接调用Nci会导致编译或运行时错误。

2. 信号参数映射错误
   你用asuLevel填充RSRP字段是错误的，CellSignalStrengthNr提供了专门的rsrp()方法获取5G的参考信号接收功率，应该替换为cellSignalStrengthNr.rsrp.toString()。

3. 缺少必要参数
   和3G/4G的参数逻辑对齐，5G分支还需要补充MCC、MNC、N-TAC（对应cellIdentityNr.tac）、网络类型标识type="5"，以及信号强度等级level，否则返回的参数不完整。

修正后的5G分支代码 #

else if (cellInfo is CellInfoNr) {
    val cellIdentityNr = cellInfo.cellIdentity
    val cellSignalStrengthNr = cellInfo.cellSignalStrength
    map["cell_identity"] = cellIdentityNr.nci.toString()
    map["MCC"] = cellIdentityNr.mcc.toString()
    map["MNC"] = cellIdentityNr.mnc.toString()
    map["TAC"] = cellIdentityNr.tac.toString() // 5G的TAC字段
    map["RSRP"] = cellSignalStrengthNr.rsrp.toString()
    map["Level_of_strength"] = cellSignalStrengthNr.level.toString()
    map["type"] = "5" // 标记为5G网络类型
}

内容的提问来源于stack exchange，提问作者YYY RAY