Android RIL源码研究笔记 の ril (二)
这篇文章介绍ril.cpp中实现部分代码中的四个字符串输出函数及其相应的枚举类型。首先看requestToString()函数的
代码，它的功能是将将ril_command.h和ril_unsol_commands.h中的命令转换成字符串描述：
[cpp]
const char * requestToString(int request) {
switch(request) {
case RIL_REQUEST_GET_SIM_STATUS: return "GET_SIM_STATUS";
case RIL_REQUEST_ENTER_SIM_PIN: return "ENTER_SIM_PIN";
case RIL_REQUEST_ENTER_SIM_PUK: return "ENTER_SIM_PUK";
case RIL_REQUEST_ENTER_SIM_PIN2: return "ENTER_SIM_PIN2";
case RIL_REQUEST_ENTER_SIM_PUK2: return "ENTER_SIM_PUK2";
case RIL_REQUEST_CHANGE_SIM_PIN: return "CHANGE_SIM_PIN";
case RIL_REQUEST_CHANGE_SIM_PIN2: return "CHANGE_SIM_PIN2";
case RIL_REQUEST_ENTER_NETWORK_DEPERSONALIZATION: return "ENTER_NETWORK_DEPERSONALIZATION";
case RIL_REQUEST_GET_CURRENT_CALLS: return "GET_CURRENT_CALLS";
case RIL_REQUEST_DIAL: return "DIAL";
case RIL_REQUEST_GET_IMSI: return "GET_IMSI";
case RIL_REQUEST_HANGUP: return "HANGUP";
case RIL_REQUEST_HANGUP_WAITING_OR_BACKGROUND: return "HANGUP_WAITING_OR_BACKGROUND";
case RIL_REQUEST_HANGUP_FOREGROUND_RESUME_BACKGROUND: return "HANGUP_FOREGROUND_RESUME_BACKGROUND";
case RIL_REQUEST_SWITCH_WAITING_OR_HOLDING_AND_ACTIVE: return "SWITCH_WAITING_OR_HOLDING_AND_ACTIVE";
case RIL_REQUEST_CONFERENCE: return "CONFERENCE";
case RIL_REQUEST_UDUB: return "UDUB";
case RIL_REQUEST_LAST_CALL_FAIL_CAUSE: return "LAST_CALL_FAIL_CAUSE";
case RIL_REQUEST_SIGNAL_STRENGTH: return "SIGNAL_STRENGTH";
case RIL_REQUEST_REGISTRATION_STATE: return "REGISTRATION_STATE";
case RIL_REQUEST_GPRS_REGISTRATION_STATE: return "GPRS_REGISTRATION_STATE";
case RIL_REQUEST_OPERATOR: return "OPERATOR";
case RIL_REQUEST_RADIO_POWER: return "RADIO_POWER";
case RIL_REQUEST_DTMF: return "DTMF";
case RIL_REQUEST_SEND_SMS: return "SEND_SMS";
case RIL_REQUEST_SEND_SMS_EXPECT_MORE: return "SEND_SMS_EXPECT_MORE";
case RIL_REQUEST_SETUP_DATA_CALL: return "SETUP_DATA_CALL";
case RIL_REQUEST_SIM_IO: return "SIM_IO";
case RIL_REQUEST_SEND_USSD: return "SEND_USSD";
case RIL_REQUEST_CANCEL_USSD: return "CANCEL_USSD";
case RIL_REQUEST_GET_CLIR: return "GET_CLIR";
case RIL_REQUEST_SET_CLIR: return "SET_CLIR";
case RIL_REQUEST_QUERY_CALL_FORWARD_STATUS: return "QUERY_CALL_FORWARD_STATUS";
case RIL_REQUEST_SET_CALL_FORWARD: return "SET_CALL_FORWARD";
case RIL_REQUEST_QUERY_CALL_WAITING: return "QUERY_CALL_WAITING";
case RIL_REQUEST_SET_CALL_WAITING: return "SET_CALL_WAITING";
case RIL_REQUEST_SMS_ACKNOWLEDGE: return "SMS_ACKNOWLEDGE";
case RIL_REQUEST_GET_IMEI: return "GET_IMEI";
case RIL_REQUEST_GET_IMEISV: return "GET_IMEISV";
case RIL_REQUEST_ANSWER: return "ANSWER";
case RIL_REQUEST_DEACTIVATE_DATA_CALL: return "DEACTIVATE_DATA_CALL";
case RIL_REQUEST_QUERY_FACILITY_LOCK: return "QUERY_FACILITY_LOCK";
case RIL_REQUEST_SET_FACILITY_LOCK: return "SET_FACILITY_LOCK";
case RIL_REQUEST_CHANGE_BARRING_PASSWORD: return "CHANGE_BARRING_PASSWORD";
case RIL_REQUEST_QUERY_NETWORK_SELECTION_MODE: return "QUERY_NETWORK_SELECTION_MODE";
case RIL_REQUEST_SET_NETWORK_SELECTION_AUTOMATIC: return "SET_NETWORK_SELECTION_AUTOMATIC";
case RIL_REQUEST_SET_NETWORK_SELECTION_MANUAL: return "SET_NETWORK_SELECTION_MANUAL";
case RIL_REQUEST_QUERY_AVAILABLE_NETWORKS : return "QUERY_AVAILABLE_NETWORKS ";
case RIL_REQUEST_DTMF_START: return "DTMF_START";
case RIL_REQUEST_DTMF_STOP: return "DTMF_STOP";
case RIL_REQUEST_BASEBAND_VERSION: return "BASEBAND_VERSION";
case RIL_REQUEST_SEPARATE_CONNECTION: return "SEPARATE_CONNECTION";
case RIL_REQUEST_SET_PREFERRED_NETWORK_TYPE: return "SET_PREFERRED_NETWORK_TYPE";
case RIL_REQUEST_GET_PREFERRED_NETWORK_TYPE: return "GET_PREFERRED_NETWORK_TYPE";
case RIL_REQUEST_GET_NEIGHBORING_CELL_IDS: return "GET_NEIGHBORING_CELL_IDS";
case RIL_REQUEST_SET_MUTE: return "SET_MUTE";
case RIL_REQUEST_GET_MUTE: return "GET_MUTE";
case RIL_REQUEST_QUERY_CLIP: return "QUERY_CLIP";
case RIL_REQUEST_LAST_DATA_CALL_FAIL_CAUSE: return "LAST_DATA_CALL_FAIL_CAUSE";
case RIL_REQUEST_DATA_CALL_LIST: return "DATA_CALL_LIST";
case RIL_REQUES
补充：移动开发 , Android ,
