Android 首选网络模式默认值的修改方法

修改系统属性：ro.telephony.default_network

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 modeint 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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