Android P系统设置之默认选择网络类型(4G，3G，2G)

╰半夏微凉° 2024-04-19 11:26 90阅读 0赞

frameworks\\base\\telephony\\java\\com\\android\\internal\\telephony\\RILConstants.java  
build\\make\\tools\\buildinfo.sh

buildinfo.sh中增加：

echo "ro.telephony.default_network=11"

网络类型定义：  
frameworks\\base\\telephony\\java\\com\\android\\internal\\telephony\\RILConstants.java

/* NETWORK_MODE_* See ril.h RIL_REQUEST_SET_PREFERRED_NETWORK_TYPE */
    int NETWORK_MODE_WCDMA_PREF     = 0; /* GSM/WCDMA (WCDMA preferred) */
    int NETWORK_MODE_GSM_ONLY       = 1; /* GSM only */
    int NETWORK_MODE_WCDMA_ONLY     = 2; /* WCDMA only */
    int NETWORK_MODE_GSM_UMTS       = 3; /* GSM/WCDMA (auto mode, according to PRL) AVAILABLE Application Settings menu*/
    int NETWORK_MODE_CDMA           = 4; /* CDMA and EvDo (auto mode, according to PRL) AVAILABLE Application Settings menu*/
    int NETWORK_MODE_CDMA_NO_EVDO   = 5; /* CDMA only */
    int NETWORK_MODE_EVDO_NO_CDMA   = 6; /* EvDo only */
    int NETWORK_MODE_GLOBAL         = 7; /* GSM/WCDMA, CDMA, and EvDo (auto mode, according to PRL) AVAILABLE Application Settings menu*/
    int NETWORK_MODE_LTE_CDMA_EVDO  = 8; /* LTE, CDMA and EvDo */
    int NETWORK_MODE_LTE_GSM_WCDMA  = 9; /* LTE, GSM/WCDMA */
    int NETWORK_MODE_LTE_CDMA_EVDO_GSM_WCDMA = 10; /* LTE, CDMA, EvDo, GSM/WCDMA */
    int NETWORK_MODE_LTE_ONLY       = 11; /* LTE Only mode. */
    int NETWORK_MODE_LTE_WCDMA      = 12; /* LTE/WCDMA */
    int NETWORK_MODE_TDSCDMA_ONLY            = 13; /* TD-SCDMA only */
    int NETWORK_MODE_TDSCDMA_WCDMA           = 14; /* TD-SCDMA and WCDMA */
    int NETWORK_MODE_LTE_TDSCDMA             = 15; /* TD-SCDMA and LTE */
    int NETWORK_MODE_TDSCDMA_GSM             = 16; /* TD-SCDMA and GSM */
    int NETWORK_MODE_LTE_TDSCDMA_GSM         = 17; /* TD-SCDMA,GSM and LTE */
    int NETWORK_MODE_TDSCDMA_GSM_WCDMA       = 18; /* TD-SCDMA, GSM/WCDMA */
    int NETWORK_MODE_LTE_TDSCDMA_WCDMA       = 19; /* TD-SCDMA, WCDMA and LTE */
    int NETWORK_MODE_LTE_TDSCDMA_GSM_WCDMA   = 20; /* TD-SCDMA, GSM/WCDMA and LTE */
    int NETWORK_MODE_TDSCDMA_CDMA_EVDO_GSM_WCDMA  = 21; /*TD-SCDMA,EvDo,CDMA,GSM/WCDMA*/
    int NETWORK_MODE_LTE_TDSCDMA_CDMA_EVDO_GSM_WCDMA = 22; /* TD-SCDMA/LTE/GSM/WCDMA, CDMA, and EvDo */
    int PREFERRED_NETWORK_MODE = Integer.parseInt(TelephonyManager.getTelephonyProperty(0,
           "ro.telephony.default_network", Integer.toString(NETWORK_MODE_WCDMA_PREF)));

网络类型4G，3G和2G的判断参考：

/** * 判断移动网络的类型 * * @param networkType * @return 移动网络类型 */
    private static final int getNetworkClass(int networkType) { 
        switch (networkType) { 
        case TelephonyManager.NETWORK_TYPE_GPRS:
        case TelephonyManager.NETWORK_TYPE_EDGE:
        case TelephonyManager.NETWORK_TYPE_CDMA:
        case TelephonyManager.NETWORK_TYPE_1xRTT:
        case TelephonyManager.NETWORK_TYPE_IDEN:
            return NETWORK_2G;
        case TelephonyManager.NETWORK_TYPE_UMTS:
        case TelephonyManager.NETWORK_TYPE_EVDO_0:
        case TelephonyManager.NETWORK_TYPE_EVDO_A:
        case TelephonyManager.NETWORK_TYPE_HSDPA:
        case TelephonyManager.NETWORK_TYPE_HSUPA:
        case TelephonyManager.NETWORK_TYPE_HSPA:
        case TelephonyManager.NETWORK_TYPE_EVDO_B:
        case TelephonyManager.NETWORK_TYPE_EHRPD:
        case TelephonyManager.NETWORK_TYPE_HSPAP:
            return NETWORK_3G;
        case TelephonyManager.NETWORK_TYPE_LTE:
            return NETWORK_4G;
        default:
            return NETWORK_UNKNOW;
        }
    }

参考文献：  
[https://blog.csdn.net/mxiaoyem/article/details/50857008][https_blog.csdn.net_mxiaoyem_article_details_50857008]

[https_blog.csdn.net_mxiaoyem_article_details_50857008]: https://blog.csdn.net/mxiaoyem/article/details/50857008