Android8.1 源码修改之插入SIM卡默认启用Volte功能

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

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