android 网络变化流程

Step 1：注册监听事件

GsmServiceStateTracker（CdmaServiceStateTracker） 在构造函数就会通过registerForVoiceNetworkStateChanged 注册网络状态的变化监听，处理事件为EVENT_NETWORK_STATE_CHANGED

Step 2：modem主动上报

01-25 10:13:56.717 D/RILJ    ( 3636): [UNSL]< UNSOL_RESPONSE_VOICE_NETWORK_STATE_CHANGED [SUB0]

Ril.java的processUnsolicited处理主动上报事件的，对应的事件为RIL_UNSOL_RESPONSE_VOICE_NETWORK_STATE_CHANGED

Step 3：处理主动上报

GsmServiceStateTracker收到EVENT_NETWORK_STATE_CHANGED就会调用PollState来获取状态

 

01-25 10:13:56.727 D/RILJ    ( 3636): [5596]> OPERATOR [SUB0] 获取运营商
01-25 10:13:56.727 D/RILJ    ( 3636): [5597]> DATA_REGISTRATION_STATE [SUB0]  获取PS状态
01-25 10:13:56.727 D/RILJ    ( 3636): [5598]> VOICE_REGISTRATION_STATE [SUB0]  获取CS状态
01-25 10:13:56.727 D/RILJ    ( 3636): [5599]> QUERY_NETWORK_SELECTION_MODE [SUB0]  获取网络模式

 

01-25 10:13:56.737 D/RILJ    ( 3636): [5597]< DATA_REGISTRATION_STATE {1, null, 0037ac1f, 14, null, 20, 4118, 470, 3648543, null, null} [SUB0]

01-25 10:13:56.747 D/RILJ    ( 3636): [5596]< OPERATOR {CHN-UNICOM, UNICOM, 46001} [SUB0]
01-25 10:13:56.757 D/RILJ    ( 3636): [5598]< VOICE_REGISTRATION_STATE {1, 1016, 0037ac1f, 14, null, null, null, 0, null, null, 1, null, null, 0, null} [SUB0]
01-25 10:13:56.757 D/RILJ    ( 3636): [5599]< QUERY_NETWORK_SELECTION_MODE {0} [SUB0]

等4个请求都返回了，调用pollStateDone来进行状态的上报，这里有一个mPollingContext，在向底层发请求会递增，，底层返回能递减，等于0就认为返回完成。

 

Step 4: 上报状态

在GsmServiceStateTracker:pollStateDone

01-25 10:13:56.767 D/QtiGsmSST( 3636): [GsmSST] Poll ServiceState done:  oldSS=[0 0 voice home data home CHN-UNICOM UNICOM 46001 CHN-UNICOM UNICOM 46001  LTE LTE CSS not supported -1 -1 RoamInd=-1 DefRoamInd=-1 EmergOnly=false IsDataRoamingFromRegistration=false] newSS=[0 0 voice home data home CHN-UNICOM UNICOM 46001 CHN-UNICOM UNICOM 46001  LTE LTE CSS not supported -1 -1 RoamInd=-1 DefRoamInd=-1 EmergOnly=false IsDataRoamingFromRegistration=false] oldMaxDataCalls=20 mNewMaxDataCalls=20 oldReasonDataDenied=-1 mNewReasonDataDenied=-1

下一步调用GsmPhone的notifyServiceStateChanged

下一步调用PhoneBase:notifyServiceStateChangedP

下一步调用DefaultPhoneNotifier:notifyServiceState

下一步调用TelephonyRegistry:notifyServiceStateForPhoneId,这里就会调用应用注册的回调函数onServiceStateChanged