前言
公用电话产品，插入SIM卡后要求自动打开Volte功能，即插即用，用完拔卡就走
实现
第一步 开关对应的代码
通过打印日志和全局查找，源码位置
vendor/mediatek/proprietary/packages/services/Telephony/src/com/android/phone/MobileNetworkSettings.java
04-15 08:15:29.238 1191-1191/com.android.phone I/NetworkSettings: isUpdateTabsNeeded:- DO_NOTHING newSil.size()=1 mActiveSubInfos.size()=1 04-15 08:15:29.240 1191-1191/com.android.phone D/NetworkSettings: initializeSubscriptions: DO_NOTHING 04-15 08:15:29.240 1191-1191/com.android.phone D/NetworkSettings: convertTabToSlot: info size=1 currentTab=0 slotId=0 04-15 08:15:29.246 1191-1191/com.android.phone I/NetworkSettings: updatePhone:- slotId=0 sir={id=1, iccId=89861114706315182802 simSlotIndex=0 displayName=中国电信 carrierName=中国电信 nameSource=0 iconTint=-16746133 dataRoaming=0 iconBitmap=android.graphics.Bitmap@ca496f0 mcc 460 mnc 11 isEmbedded false accessRules null} 04-15 08:15:29.246 1191-1191/com.android.phone D/NetworkSettings: updateBody: isLteOnCdma=true phoneSubId=1 04-15 08:15:29.253 1191-1191/com.android.phone D/NetworkSettings: phoneType == PhoneConstants.PHONE_TYPE_CDMA or is CT VOLTE... 04-15 08:15:29.266 1191-1191/com.android.phone D/NetworkSettings: isWorldMode=false 04-15 08:15:29.267 1191-1191/com.android.phone D/NetworkSettings: isWorldMode=false 04-15 08:15:29.267 1191-1191/com.android.phone D/NetworkSettings: settingsNetworkMode: 10 04-15 08:15:29.285 1191-1191/com.android.phone D/NetworkSettings: [addEnhanced4GLteSwitchPreference] volteEnabled :true 04-15 08:15:29.285 1191-1191/com.android.phone D/NetworkSettings: [addEnhanced4GLteSwitchPreference] Remove mButton4glte! 04-15 08:15:29.285 1191-1191/com.android.phone D/NetworkSettings: [addEnhanced4GLteSwitchPreference] ss :false 04-15 08:15:29.307 1191-1191/com.android.phone D/DefaultMobileNetworkSettingsExt: customizeEnhanced4GLteSwitchPreference 04-15 08:15:29.320 1191-1191/com.android.phone D/NetworkSettings: CdmaNetworkSettings destroy com.android.phone.MobileNetworkSettings@99b81a5 04-15 08:15:29.320 1191-1191/com.android.phone D/CdmaNetworkSettings: onDestroy
通过 MtkImsManager.setEnhanced4gLteModeSetting(this, enhanced4gModePref.isChecked(), phoneId); 这行代码来实现volte的打开、关闭
详细的分析流程，请看这篇
第二步 插卡后调用开关的代码
通过插卡后分析日志发现打印 android.intent.action.SIM_STATE_CHANGED， 字面意思Sim卡状态改变通知, 全局查找到，
源码位置
vendor\mediatek\proprietary\packages\services\Telephony\src\com\mediatek\settings\cdma\CdmaVolteServiceChecker.java
修改如下
private BroadcastReceiver mReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { Log.d(TAG, "onReceive, action = " + intent.getAction()); updateState(); // cczheng add when recive SIM_STATE_CHANGED default open volte if (TelephonyIntents.ACTION_SIM_STATE_CHANGED.equals(intent.getAction())) { updateVolteState(); } }; }; //cczheng add check volte is open, and defalut open volte private void updateVolteState(){ Log.e(TAG, "updateVolteState...."); int subId = getListenSubId(); Log.i(TAG, "isValidSubscriptionId=="+SubscriptionManager.isValidSubscriptionId(subId)); Log.i(TAG, "isCtVolteEnabled=="+TelephonyUtilsEx.isCtVolteEnabled()); if (SubscriptionManager.isValidSubscriptionId(subId) && TelephonyUtilsEx.isCtVolteEnabled()) { boolean volteOn = MtkImsManager.isEnhanced4gLteModeSettingEnabledByUser(mContext, SubscriptionManager.getPhoneId(subId)); boolean isEnable4gOn = isEnable4gOn(subId); Log.i(TAG, "isEnable4gOn=="+isEnable4gOn); Log.i(TAG, "volteOn=="+volteOn); int phoneId = SubscriptionManager.getPhoneId(subId); Log.e(TAG, "phoneId = " + phoneId + " subId="+subId); if (!volteOn) { MtkImsManager.setEnhanced4gLteModeSetting(mContext, true, phoneId); } } }
至此，搞定，简单说下上面的代码，当收到SIM状态改变的广播，检查卡的subId是否是有效的(subId>0)，卡片是否支持Volte功能，同时满足则获取当前Volte是否已启用，未启用则调用MtkImsManager.setEnhanced4gLteModeSetting()打开
