这篇文章主要介绍Android8.1源码修改之插入SIM卡默认启用Volte功能的示例分析，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
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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
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);
}
}
}
private boolean isLteNetwork(int subId) {
boolean isLte = false;
int networkType = TelephonyManager.NETWORK_TYPE_UNKNOWN;
final int dataNetworkType = TelephonyManager.getDefault().getDataNetworkType(subId);
final int voiceNetworkType = TelephonyManager.getDefault().getVoiceNetworkType(subId);
Log.d(TAG, "dataNetworkType = " + dataNetworkType
+ ", voiceNetworkType = " + voiceNetworkType);
if (TelephonyManager.NETWORK_TYPE_UNKNOWN != dataNetworkType) {
networkType = dataNetworkType;
} else if (TelephonyManager.NETWORK_TYPE_UNKNOWN != voiceNetworkType) {
networkType = voiceNetworkType;
}
if ((networkType == TelephonyManager.NETWORK_TYPE_LTE)
|| (networkType == TelephonyManager.NETWORK_TYPE_LTE_CA)) {
isLte = true;
}
Log.d(TAG, "isLte = " + isLte);
return isLte;
}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
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