【Telephony】multi_sim_config_changed

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已于 2023-07-06 20:36:01 修改 · 324 阅读

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#Telephony

于 2023-07-05 21:50:35 首次发布

该文详细阐述了Android系统中如何注册并处理多SIM卡配置变化的事件。当配置改变时，一系列的更新和广播过程发生，包括更新SubscriptionInfo、读取配置文件、通知订阅者以及更新订阅信息。整个流程涉及多个组件如PhoneFactory、TelephonyComponentFactory、SubscriptionInfoUpdater和CarrierConfigLoader，确保系统能正确响应SIM卡状态的变化。

1、注册观察者

--> PhoneFactory.makeDefaultPhones() 
--> TelephonyComponentFactory.makeSubscriptionInfoUpdater() 
--> new SubscriptionInfoUpdater() 
--> PhoneConfigurationManager.registerForMultiSimConfigChange(this, EVENT_MULTI_SIM_CONFIG_CHANGED, null)
--> sMultiSimConfigChangeRegistrants.addUnique(h, what, obj)    观察者注册到通知者中

到这步，注册了对 EVENT_MULTI_SIM_CONFIG_CHANGED 事件的观察，当收到通知者notify时，就由SubscriptionInfoUpdater这个Handler对象来处理事件。

其实只要某个类中调用了PhoneConfigurationManager.registerForMultiSimConfigChange()，就会产生一个观察者并注册到通知者中
比如下面这些类的方法中都有注册观察者
在这里插入图片描述

2、触发事件

--> PhoneInterfaceManager.switchMultiSimConfig() 
--> RadioConfig.setNumOfLiveModems()
--> RadioConfigProxy.setNumOfLiveModems()  
--> 下发modem请求
--> modem返回响应，回调处理事件 EVENT_SWITCH_DSDS_CONFIG_DONE
--> ConfigurationManagerHandler.handleMessage()

--> PhoneConfigurationManager.onMultiSimConfigChanged()
--> broadcastMultiSimConfigChange()
--> notifyMultiSimConfigChange()   
--> sMultiSimConfigChangeRegistrants.notifyResult()   1.通知者通知观察者
--> SubscriptionInfoUpdater.handleMessage()
--> onMultiSimConfigChanged()

    private void onMultiSimConfigChanged() {
   
   
        int activeModemCount = ((TelephonyManager) sContext.getSystemService(
                Context.TELEPHONY_SERVICE)).getActiveModemCount();
        // For inactive modems, reset its states.
        for (int phoneId = activeModemCount; phoneId < SUPPORTED_MODEM_COUNT; phoneId++) {
   
   
            sIccId[phoneId] = null;
            sSimCardState[phoneId] = TelephonyManager.SIM_STATE_UNKNOWN;
            sSimApplicationState[phoneId] = TelephonyManager.SIM_STATE_UNKNOWN;
        }
    }

--> Intent intent = new Intent(ACTION_MULTI_SIM_CONFIG_CHANGED); sendBroadcast(intent)    2.发送广播
--> ConfigLoaderBroadcastReceiver.onReceive()
--> sendMessge(EVENT_MULTI_SIM_CONFIG_CHANGED)
--> ConfigHandler.handleMessage()
--> CarrierConfigLoader.onMultiSimConfigChanged()
--> updateConfigForPhoneId()
--> sendMessage(mHandler.obtainMessage(EVENT_DO_FETCH_DEFAULT, phoneId, -1));
--> handleMessage(EVENT_DO_FETCH_DEFAULT)

	config = restoreConfigFromXml(mPlatformCarrierConfigPackage, "", phoneId);
    if (config != null) {
   
   
         logd(
                 "Loaded config from XML. package="
                         + mPlatformCarrierConfigPackage
                         + " phoneId="
                         + phoneId);
         mConfigFromDefaultApp[phoneId] = config;
         Message newMsg = obtainMessage(EVENT_FETCH_DEFAULT_DONE, phoneId, -1);
         newMsg.getData().putBoolean("loaded_from_xml", true);
         mHandler.sendMessage(newMsg);
     } else {
   
   ...}

== 读取xml配置文件 config = restoreConfigFromXml(mPlatformCarrierConfigPackage, “”, phoneId);==

private PersistableBundle restoreConfigFromXml(@Nullable String packageName,
            @NonNull String extraString, int phoneId, boolean isNoSimConfig) {
   
   
        if (packageName == null) {
   
   
            loge("Cannot restore config with null packageName");
        }
        final String version = getPackageVersion(packageName);
        if (version == null) {
   
   
            loge("Failed to get package version for: " + packageName);
            return null;
        }

        String fileName;
        String iccid = null;
        if (isNoSimConfig) {
   
   
            fileName = getFilenameForNoSimConfig(packageName);
        } else {
   
   
            if (SubscriptionManager.getSimStateForSlotIndex(phoneId)
                    != TelephonyManager.SIM_STATE_LOADED) {
   
   
                loge("Skip restore config because SIM records are not loaded.");
                return null;
            }

            iccid = getIccIdForPhoneId(phoneId);
            final int cid = getSpecificCarrierIdForPhoneId(phoneId);
            if (iccid == null) {
   
   
                loge("Cannot restore config with null iccid.");
                return null;
            }
            fileName = getFilenameForConfig(packageName, extraString, iccid, cid);
        }

        PersistableBundle restoredBundle = null;
        File file = null;