如何在Android应用中获得准确的信号强度？

Question

我使用CellInfo每秒捕获信号强度和ARFCN/UARFCN/EARFCN。

但是，我认为它不是很准确。它总是比电话设置中显示的信号强度差-5 ~ -10 dBm。有时，我也会得到0或integer.MAX_VALUE。我的代码有什么问题吗?或者有没有其他方法来捕获真正的信号强度？

var cellInfoList: List<CellInfo> = mTelephonyManager.allCellInfo
if (cellInfoList.isNotEmpty()) {
    for (cellInfo in cellInfoList) {
        if (cellInfo is CellInfoLte) {
            val cellSignalStrengthLte = cellInfo.cellSignalStrength
            val cellIdentityLte = cellInfo.cellIdentity
            var arfcn = cellIdentityLte.earfcn
            intSignalStrength = cellSignalStrengthLte.dbm
            networkStatus = "${Integer.toString(intSignalStrength)} dBm | $arfcn"
        } else if (cellInfo is CellInfoGsm) {
            val cellSignalStrengthGsm = cellInfo.cellSignalStrength
            val cellIdentityGsm = cellInfo.cellIdentity
            var arfcn = cellIdentityGsm.arfcn
            intSignalStrength = cellSignalStrengthGsm.dbm
            networkStatus = "${Integer.toString(intSignalStrength)} dBm | $arfcn"
        } else if (cellInfo is CellInfoWcdma) {
            val cellSignalStrengthWcdma = cellInfo.cellSignalStrength
            val cellIdentityWcdma = cellInfo.cellIdentity
            var arfcn = uarfcnToBand(cellIdentityWcdma.uarfcn)
            intSignalStrength = cellSignalStrengthWcdma.dbm
            networkStatus = "${Integer.toString(intSignalStrength)} dBm | $arfcn"
        } else if (cellInfo is CellInfoCdma) {
            val cellSignalStrengthCdma = cellInfo.cellSignalStrength
            intSignalStrength = cellSignalStrengthCdma.dbm
            networkStatus = "${Integer.toString(intSignalStrength)} dBm"
        }
    }
}

Answer 1

我找到解决方案了。问题出在for循环。最新的信号强度是在第一个循环中，因此下面的循环将覆盖我需要的结果。