Android 修改SIM卡默认VOLTE值

Android 9.0之前版本修改如下

//frameworks\base\packages\SettingsProvider\src\com\android\providers\settings\DatabaseHelper.javaloadSetting(stmt, Settings.Global.ENHANCED_4G_MODE_ENABLED, ImsConfig.FeatureValueConstants.OFF);

设置 ENHANCED_4G_MODE_ENABLED 为 ON/OFF 即可

Android 9.0及之后版本

DatabaseHelper.java 中设置项已经取消，修改如下

//frameworks\base\telephony\java\android\telephony\CarrierConfigManager.javasDefaults.putBoolean(KEY_HIDE_ENHANCED_4G_LTE_BOOL, true);
sDefaults.putBoolean(KEY_ENHANCED_4G_LTE_ON_BY_DEFAULT_BOOL, false);

KEY_HIDE_ENHANCED_4G_LTE_BOOL 设置是否隐藏VoLTE开关；

KEY_ENHANCED_4G_LTE_ON_BY_DEFAULT_BOOL 设置VoLTE模式默认值。

MTK 平台代码修改

MTK增加了 ImsService 管理 IMS 相关服务，在开机或者是热插拔时，从modem侧获取 SIM 内数据后，会同步 SIM 自身保存内容到系统，如下：

//vendor/mediatek/proprietary/packages/services/Ims/src/com/mediatek/ims/ImsService.java/***Ims service Message hanadler.*@hide*/private class MyHandler extends Handler {... ...@Overridepublic void handleMessage(Message msg) {AsyncResult ar;Intent intent;switch (msg.what) {... .../// M: Sync volte setting value. @{case EVENT_IMS_VOLTE_SETTING_URC:/*ar = (AsyncResult) msg.obj;boolean enable = ((int[]) ar.result)[0] == 1;int simState = SubscriptionManager.getSimStateForSlotIndex(mSocketId);if (simState == TelephonyManager.SIM_STATE_ABSENT|| (getSubIdUsingPhoneId(mSocketId)<= SubscriptionManager.INVALID_SUBSCRIPTION_ID)) {if (mRegisterSubInfoChange == false) {final IntentFilter filter = new IntentFilter();filter.addAction(TelephonyIntents.ACTION_SUBINFO_RECORD_UPDATED);mContext.registerReceiver(mSubInfoReceiver, filter);mRegisterSubInfoChange = true;}mWaitSubInfoChange[mSocketId] = true;} else {mWaitSubInfoChange[mSocketId] = false;}mVolteEnable[mSocketId] = enable;if (mWaitFeatureChange == 0) {SystemProperties.set(PROPERTY_IMSCONFIG_FORCE_NOTIFY, "1");IntentFilter filter = new IntentFilter();filter.addAction(ImsConfig.ACTION_IMS_FEATURE_CHANGED);mContext.registerReceiver(mFeatureValueReceiver, filter);}mWaitFeatureChange = mWaitFeatureChange | (1 << mSocketId);setEnhanced4gLteModeSetting(mSocketId, enable);log("handleMessage() : Volte_Setting_Enable=" + enable +", register:" + mWaitSubInfoChange[mSocketId] +", mWaitFeatureChange:" + mWaitFeatureChange);*/break;/// @}... ...}

需要将 EVENT_IMS_VOLTE_SETTING_URC 这部分移除，避免将 SIM 内保存的数据设置到机器中。

题外话：VoLTE 模式的设置及状态获取通过 MtkImsManager.java 的接口获取。

//vendor/mediatek/proprietary/frameworks/opt/net/ims/src/java/com/mediatek/ims/internal/MtkImsManager.java@Overridepublic boolean isEnhanced4gLteModeSettingEnabledByUser() {int sub = getSubId();int setting = SubscriptionManager.getIntegerSubscriptionProperty(sub, SubscriptionManager.ENHANCED_4G_MODE_ENABLED,SUB_PROPERTY_NOT_INITIALIZED, mContext);boolean onByDefault = getBooleanCarrierConfig(CarrierConfigManager.KEY_ENHANCED_4G_LTE_ON_BY_DEFAULT_BOOL);boolean isPSsupport = isPhoneIdSupportIms(mPhoneId);// If sim not ready yet, default offif (sub == SubscriptionManager.INVALID_SUBSCRIPTION_ID) {onByDefault = false;}// If Enhanced 4G LTE Mode is uneditable or not initialized, we use the default valueif (!getBooleanCarrierConfig(CarrierConfigManager.KEY_EDITABLE_ENHANCED_4G_LTE_BOOL)|| setting == SUB_PROPERTY_NOT_INITIALIZED) {if (onByDefault) {// For CT roaming case or dual mode card, it's mccmnc maybe 20404,// carrier config volte value is not consist to CT request.String iccid = SystemProperties.get(PROPERTY_ICCID_SIM[mPhoneId],"N/A");if (!TextUtils.isEmpty(iccid) && isOp09SimCard(iccid)) {onByDefault = false;log("volte_setting, Replace volte value for CT card case");}}return onByDefault;} else {return (setting == ImsConfig.FeatureValueConstants.ON) && isPSsupport;}}/*** @param context* @param enabled* @param phoneId*/public static void setEnhanced4gLteModeSetting(Context context,boolean enabled, int phoneId) {if (!isSupportMims()) {phoneId = getMainPhoneIdForSingleIms(context);}getAppropriateManagerForPlugin(context, phoneId).setEnhanced4gLteModeSetting(enabled);}

这里最终还是调用的系统原生类 SubscriptionManager.java 去获取管理。SubscriptionManager 是 SubscriptionController 的应用程序接口了，通过binder跨进程去 SubscriptionController 中继续执行。SubscriptionController运行在phone进程中，为 SIM 卡相关功能服务。

        try {ISub iSub = ISub.Stub.asInterface(ServiceManager.getService("isub"));if (iSub != null) {subInfo = iSub.getActiveSubscriptionInfo(subId, mContext.getOpPackageName());}} catch (RemoteException ex) {// ignore it}

SubscriptionController 包含了通过 getContentResolver 查询修改 telephony 数据库操作，telephony 数据库则由 TelephonyProvider.java 去创建，保存包括 siminfo 和 carriers 等表，记录 SIM 信息和 APN 信息等。数据库路径：data/user_de/0/com.android.providers.telephony/