Platform: RK3399

OS: Android 7.1

Kernel: v4.4.126

需求

将设置首选网络类型由3G设置为LTE

设置步骤

diff --git a/rk3399_mid_pi/system.prop b/r`k3399_mid_pi/system.prop

index 7afd10d..0f28e70 100755

--- a/rk3399_mid_pi/system.prop

+++ b/rk3399_mid_pi/system.prop

@@ -38,3 +38,6 @@ wifi.supplicant_scan_interval=15

ro.factory.tool=0

#set default lcd density for rk3399 tablet

ro.sf.lcd_density=280

+

+#set default network mode

+#(NETWORK_MODE_LTE_TDSCDMA_CDMA_EVDO_GSM_WCDMA)

+ro.telephony.default_network=22

源码路径

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_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

frameworks/base/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java

// 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());