DcTracker在数据业务中扮演着很重要的作用,数据业务相关的事件都通知到DcTracker，再从DcTracker发起对应事件的处理.可以从下面的图进行理解.

1.对应的事件常遇到的有:

EVENT_RECORDS_LOADED：

EVENT_DATA_CONNECTION_DETACHED：

EVENT_DATA_CONNECTION_ATTACHED：

EVENT_APN_CHANGED:

EVENT_TRY_SETUP_DATA:

EVENT_CLEAN_UP_CONNECTION:

EVENT_SET_INTERNAL_DATA_ENABLE:

EVENT_CLEAN_UP_ALL_CONNECTIONS:

EVENT_DATA_RAT_CHANGED:

EVENT_ENABLE_NEW_APN:

EVENT_ROAMING_OFF:

EVENT_ROAMING_ON:

EVENT_RADIO_AVAILABLE:

EVENT_DATA_SETUP_COMPLETE:

EVENT_DATA_SETUP_COMPLETE_ERROR:

EVENT_DISCONNECT_DONE:

EVENT_DISCONNECT_DC_RETRYING:

EVENT_VOICE_CALL_STARTED:

EVENT_VOICE_CALL_ENDED:

CMD_SET_USER_DATA_ENABLE:

CMD_SET_DEPENDENCY_MET:

CMD_SET_POLICY_DATA_ENABLE:

EVENT_ICC_CHANGED:

CMD_NET_STAT_POLL:

EVENT_SET_CARRIER_DATA_ENABLED: