Android(安卓)首选网络模式默认值的修改方法

高通 Android9

更改以下文件

Y:\project\msm8953_android9\device\qcom\msm8953_64\system.prop

ro.telephony.default_network=9

删除Y:\project\msm8953_android9\out\target\product\msm8953_64\system\build.prop

全编译，烧录system.img

或者直接push Y:\project\msm8953_android9\out\target\product\msm8953_64\system\build.prop

修改说明：

可连续给两个值（如4，1），卡1用的是4，卡2用的是1。数字代表的意义见下方的相关代码片段。

相关代码片段：

    /* 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_CMDA_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_TD_SCDMA_ONLY            = 13; /* TD-SCDMA only */
    int NETWORK_MODE_TD_SCDMA_WCDMA           = 14; /* TD-SCDMA and WCDMA */
    int NETWORK_MODE_TD_SCDMA_LTE             = 15; /* TD-SCDMA and LTE */
    int NETWORK_MODE_TD_SCDMA_GSM             = 16; /* TD-SCDMA and GSM */
    int NETWORK_MODE_TD_SCDMA_GSM_LTE         = 17; /* TD-SCDMA,GSM and LTE */
    int NETWORK_MODE_TD_SCDMA_GSM_WCDMA       = 18; /* TD-SCDMA, GSM/WCDMA */
    int NETWORK_MODE_TD_SCDMA_WCDMA_LTE       = 19; /* TD-SCDMA, WCDMA and LTE */
    int NETWORK_MODE_TD_SCDMA_GSM_WCDMA_LTE   = 20; /* TD-SCDMA, GSM/WCDMA and LTE */
    int NETWORK_MODE_TD_SCDMA_CDMA_EVDO_GSM_WCDMA = 21; /*TD-SCDMA,EvDo,CDMA,GSM/WCDMA*/
    int NETWORK_MODE_TD_SCDMA_LTE_CDMA_EVDO_GSM_WCDMA = 22; /* TD-SCDMA/LTE/GSM/WCDMA, CDMA, and
                                                               EvDo */

    // Set the preferred network mode
    int defaultNetworkType = RILConstants.PREFERRED_NETWORK_MODE;
    int numPhones = MSimTelephonyManager.getDefault().getPhoneCount();
    String networkMode = SystemProperties.get("ro.telephony.default_network");
    if (networkMode != null) {
        if (numPhones == MSimConstants.MAX_PHONE_COUNT_SINGLE_SIM) {
            loadSetting(
                    stmt,
                    Settings.Global.PREFERRED_NETWORK_MODE,
                    MSimTelephonyManager.getTelephonyProperty(
                            "ro.telephony.default_network", 0,
                            Integer.toString(defaultNetworkType)));
        } else {
            loadSetting(stmt, Settings.Global.PREFERRED_NETWORK_MODE, networkMode);
                    }
    } else {
                    StringBuilder sb = new StringBuilder(defaultNetworkType);
        for (int i = 0; i < numPhones - 1; i++) {
            sb.append(",");
           sb.append(RILConstants.NETWORK_MODE_GSM_ONLY);
        }
        loadSetting(stmt, Settings.Global.PREFERRED_NETWORK_MODE, sb.toString());
    }
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