Question

我使用下面的adb命令将首选网络模式更改为GSM，其中值为1，任何人都可以为其他模式提供值 - GWL（GSM / WCDMA / LTEONLY） - 仅限LTE - WCDMA首选等

adb root
adb wait-for-devices
adb shell sqlite3 /data/data/com.android.providers.settings/databases/settings.db "update global SET value=12 WHERE name='preferred_network_mode'"
adb shell sqlite3 /data/data/com.android.providers.settings/databases/settings.db "select value FROM secure WHERE name='preferred_network_mode'"
adb reboot

Answer 1

include/telephony/ril.h

typedef enum {
    PREF_NET_TYPE_GSM_WCDMA                = 0, /* GSM/WCDMA (WCDMA preferred) */
    PREF_NET_TYPE_GSM_ONLY                 = 1, /* GSM only */
    PREF_NET_TYPE_WCDMA                    = 2, /* WCDMA  */
    PREF_NET_TYPE_GSM_WCDMA_AUTO           = 3, /* GSM/WCDMA (auto mode, according to PRL) */
    PREF_NET_TYPE_CDMA_EVDO_AUTO           = 4, /* CDMA and EvDo (auto mode, according to PRL) */
    PREF_NET_TYPE_CDMA_ONLY                = 5, /* CDMA only */
    PREF_NET_TYPE_EVDO_ONLY                = 6, /* EvDo only */
    PREF_NET_TYPE_GSM_WCDMA_CDMA_EVDO_AUTO = 7, /* GSM/WCDMA, CDMA, and EvDo (auto mode, according to PRL) */
    PREF_NET_TYPE_LTE_CDMA_EVDO            = 8, /* LTE, CDMA and EvDo */
    PREF_NET_TYPE_LTE_GSM_WCDMA            = 9, /* LTE, GSM/WCDMA */
    PREF_NET_TYPE_LTE_CMDA_EVDO_GSM_WCDMA  = 10, /* LTE, CDMA, EvDo, GSM/WCDMA */
    PREF_NET_TYPE_LTE_ONLY                 = 11, /* LTE only */
    PREF_NET_TYPE_LTE_WCDMA                = 12,  /* LTE/WCDMA */
    PREF_NET_TYPE_TD_SCDMA_ONLY            = 13, /* TD-SCDMA only */
    PREF_NET_TYPE_TD_SCDMA_WCDMA           = 14, /* TD-SCDMA and WCDMA */
    PREF_NET_TYPE_TD_SCDMA_LTE             = 15, /* TD-SCDMA and LTE */
    PREF_NET_TYPE_TD_SCDMA_GSM             = 16, /* TD-SCDMA and GSM */
    PREF_NET_TYPE_TD_SCDMA_GSM_LTE         = 17, /* TD-SCDMA,GSM and LTE */
    PREF_NET_TYPE_TD_SCDMA_GSM_WCDMA       = 18, /* TD-SCDMA, GSM/WCDMA */
    PREF_NET_TYPE_TD_SCDMA_WCDMA_LTE       = 19, /* TD-SCDMA, WCDMA and LTE */
    PREF_NET_TYPE_TD_SCDMA_GSM_WCDMA_LTE   = 20, /* TD-SCDMA, GSM/WCDMA and LTE */
    PREF_NET_TYPE_TD_SCDMA_GSM_WCDMA_CDMA_EVDO_AUTO  = 21, /* TD-SCDMA, GSM/WCDMA, CDMA and EvDo */
    PREF_NET_TYPE_TD_SCDMA_LTE_CDMA_EVDO_GSM_WCDMA   = 22  /* TD-SCDMA, LTE, CDMA, EvDo GSM/WCDMA */
} RIL_PreferredNetworkType;

仅使用adb的GWL / LTE ONLY / WCDMA ON / GSM的preferred_network_mode值

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