关于RadioTechnology与NetworkType的转换

我们经常在Log中看到，有的LTE =13，而有的LTE =14，其实不然，这两个都表示LTE 4G网络，下面我们来看一下这中间的原因。

在TelephonyManager.java中：

    /** Current network is LTE */
    public static final int NETWORK_TYPE_LTE = 13;
    /** Current network is eHRPD */
    public static final int NETWORK_TYPE_EHRPD = 14;

这里定义的NETWORK_TYPE_LTE=13；

而在ServiceState.java中：

    /** @hide */
    public static final int RIL_RADIO_TECHNOLOGY_EHRPD = 13;
    /** @hide */
    public static final int RIL_RADIO_TECHNOLOGY_LTE = 14;

这里定义的RIL_RADIO_TECHNOLOGY_LTE = 14；

问题来了，那么我们要按照哪个标准来解决Log呢？来分析一下转换过程。

在ServiceState.java里有个函数rilRadioTechnologyToNetworkType()，用来转换RadioTechnology与NetworkType。

private int rilRadioTechnologyToNetworkType(int rt) {
        switch(rt) {
        case ServiceState.RIL_RADIO_TECHNOLOGY_GPRS:
            return TelephonyManager.NETWORK_TYPE_GPRS;
        case ServiceState.RIL_RADIO_TECHNOLOGY_EDGE:
            return TelephonyManager.NETWORK_TYPE_EDGE;
        case ServiceState.RIL_RADIO_TECHNOLOGY_UMTS:
            return TelephonyManager.NETWORK_TYPE_UMTS;
        case ServiceState.RIL_RADIO_TECHNOLOGY_HSDPA:
            return TelephonyManager.NETWORK_TYPE_HSDPA;
        case ServiceState.RIL_RADIO_TECHNOLOGY_HSUPA:
            return TelephonyManager.NETWORK_TYPE_HSUPA;
        case ServiceState.RIL_RADIO_TECHNOLOGY_HSPA:
            return TelephonyManager.NETWORK_TYPE_HSPA;
        case ServiceState.RIL_RADIO_TECHNOLOGY_IS95A:
        case ServiceState.RIL_RADIO_TECHNOLOGY_IS95B:
            return TelephonyManager.NETWORK_TYPE_CDMA;
        case ServiceState.RIL_RADIO_TECHNOLOGY_1xRTT:
            return TelephonyManager.NETWORK_TYPE_1xRTT;
        case ServiceState.RIL_RADIO_TECHNOLOGY_EVDO_0:
            return TelephonyManager.NETWORK_TYPE_EVDO_0;
        case ServiceState.RIL_RADIO_TECHNOLOGY_EVDO_A:
            return TelephonyManager.NETWORK_TYPE_EVDO_A;
        case ServiceState.RIL_RADIO_TECHNOLOGY_EVDO_B:
            return TelephonyManager.NETWORK_TYPE_EVDO_B;
        case ServiceState.RIL_RADIO_TECHNOLOGY_EHRPD:
            return TelephonyManager.NETWORK_TYPE_EHRPD;
        case ServiceState.RIL_RADIO_TECHNOLOGY_LTE:  //在此处做转换
            return TelephonyManager.NETWORK_TYPE_LTE;
        case ServiceState.RIL_RADIO_TECHNOLOGY_HSPAP:
            return TelephonyManager.NETWORK_TYPE_HSPAP;
        case ServiceState.RIL_RADIO_TECHNOLOGY_GSM:
            return TelephonyManager.NETWORK_TYPE_GSM;
        case ServiceState.RIL_RADIO_TECHNOLOGY_TD_SCDMA:
            return TelephonyManager.NETWORK_TYPE_TD_SCDMA;
        case ServiceState.RIL_RADIO_TECHNOLOGY_IWLAN:
            return TelephonyManager.NETWORK_TYPE_IWLAN;
        case ServiceState.RIL_RADIO_TECHNOLOGY_LTE_CA:
            return TelephonyManager.NETWORK_TYPE_LTE_CA;
        default:
            return TelephonyManager.NETWORK_TYPE_UNKNOWN;
        }
    }

ServiceState和TelephonyManager的定义半数以上是不一致的，不过名称上绝大部分是一样的，基本都能一一对应得上。

CSDN博客：
https://blog.csdn.net/wys_yuan/article/details/80320505