虚拟运营商与实体运营商的apn匹配逻辑

如下为apn匹配相关代码，从代码可知，平台apn匹配逻辑为：先匹配虚拟运营商apn，如果不满足再匹配实体运营商apn。
注意：如果插入虚拟运营商的卡，也配置了对应虚拟运营商的apn,但是只配置了一部分，例如没有配置用于上网的default类型apn,则会出现不能上网的问题。根据代码逻辑，只要配置了虚拟运营商apn就会匹配虚拟运营商apn，这时即使配置了实体运营商对应的default类型apn也是不会走该部分逻辑的。
/packages/providers/TelephonyProvider/src/com/android/providers/telephony/TelephonyProvider.java

4038 // Separate the result into MatrixCursor
4039 while (ret.moveToNext()) {
4040 List data = new ArrayList<>();
4041 for (String column : columnNames) {
4042 data.add(ret.getString(ret.getColumnIndex(column)));
4043 }
4044
4045 boolean isCurrentSimOperator;
4046 final long identity = Binder.clearCallingIdentity();
4047 try {
4048 isCurrentSimOperator = tm.matchesCurrentSimOperator(
4049 ret.getString(numericIndex),
4050 getMvnoTypeIntFromString(ret.getString(mvnoIndex)),
4051 ret.getString(mvnoDataIndex));
4052 } finally {
4053 Binder.restoreCallingIdentity(identity);
4054 }
4055
4056 boolean isMVNOAPN = !TextUtils.isEmpty(ret.getString(numericIndex))
4057 && isCurrentSimOperator;
4058 boolean isMNOAPN = !TextUtils.isEmpty(ret.getString(numericIndex))
4059 && ret.getString(numericIndex).equals(mccmnc)
4060 && TextUtils.isEmpty(ret.getString(mvnoIndex));
4061 boolean isCarrierIdAPN = !TextUtils.isEmpty(ret.getString(carrierIdIndex))
4062 && ret.getString(carrierIdIndex).equals(String.valueOf(carrierId))
4063 && carrierId != TelephonyManager.UNKNOWN_CARRIER_ID;
4064
4065 if (isMVNOAPN) {
4066 // 1. The APN that query based on legacy SIM MCC/MCC and MVNO
4067 currentCursor.addRow(data);
4068 } else if (isMNOAPN) {
4069 // 2. The APN that query based on SIM MCC/MNC
4070 parentCursor.addRow(data);
4071 } else if (isCarrierIdAPN) {
4072 // The APN that query based on carrier Id (not include the MVNO or MNO APN)
4073 carrierIdCursor.addRow(data);
4074 }