buildWaitingApns()的时候,如果申请的数据业务类型是dun类型，那么就通过下面的方法来获取dun apn.

private ArrayList<ApnSetting> buildWaitingApns(String requestedApnType, int radioTech) {

if (DBG) log("buildWaitingApns: E requestedApnType=" + requestedApnType);

ArrayList<ApnSetting> apnList = new ArrayList<ApnSetting>();

if (requestedApnType.equals(PhoneConstants.APN_TYPE_DUN)) {

    ApnSetting dun = fetchDunApn();

    if (dun != null) {

         apnList.add(dun);

         if (DBG) log("buildWaitingApns: X added APN_TYPE_DUN apnList=" + apnList);

         return apnList;

      }

   }

.............................

}

其中的fetchDunApn()里面可以做如下需求,

1.假如数据库里面有Dun apn,那么可以在mAllApnSettings里面取对应的Dun APN进行返回.

2.如果不做1中的定制,那么将通过下面的方式获得DUN APN.

Settings.Global.getString(mResolver, Settings.Global.TETHER_DUN_APN);

3.如果1,2都不满足需求那么通过下面方法获得DUN APN.

mPhone.getContext().getResources().getStringArray(R.array.config_tether_apndata);