【笔记】Android 驻网（网络注册）状态变化的代码实现

背景

基于 Android U/V 代码。

疑问：注册状态是仅看数据吗？通过hasRegistered 确认？从代码看是data 和voice combine的 。

目标：分析注册过程中，Modem返回的code值得含义，以及MD和AP code的映射关系。

功能说明

网络已注册（驻网成功）跟能上网是两码事，比如驻网了也能上不了网。

IMS注册失败跟驻网也是两种功能场景，如ims注册失败，但是网络已经注册。

代码

ServiceStateTracker.java 

ServiceStateTracker.java - OpenGrok cross reference for /frameworks/opt/telephony/src/java/com/android/internal/telephony/ServiceStateTracker.java

package com.android.internal.telephony;
/*** {@hide}*/
public class ServiceStateTracker extends Handler {static final String LOG_TAG = "SST";@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)public ServiceState mSS;@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)private ServiceState mNewSS;// A placeholder service state which will always be out of service. This is broadcast to// listeners when the subscription ID for a phone becomes invalid so that they get a final// state update.private final ServiceState mOutOfServiceSS;private void pollStateDone() {if (!mPhone.isPhoneTypeGsm()) {updateRoamingState();}//设备之前未在服务区但现在已经成功注册到网络。//因此不是指示当时是否驻网，而是表示是否有变化切换到注册。boolean hasRegistered =mSS.getState() != ServiceState.STATE_IN_SERVICE&& mNewSS.getState() == ServiceState.STATE_IN_SERVICE;//同上的逻辑，从有服务到无服务。boolean hasDeregistered =mSS.getState() == ServiceState.STATE_IN_SERVICE&& mNewSS.getState() != ServiceState.STATE_IN_SERVICE;boolean hasAirplaneModeOnChanged =mSS.getState() != ServiceState.STATE_POWER_OFF&& mNewSS.getState() == ServiceState.STATE_POWER_OFF;boolean hasAirplaneModeOffChanged =mSS.getState() == ServiceState.STATE_POWER_OFF&& mNewSS.getState() != ServiceState.STATE_POWER_OFF;SparseBooleanArray hasDataAttached = new SparseBooleanArray();SparseBooleanArray hasDataDetached = new SparseBooleanArray();SparseBooleanArray hasRilDataRadioTechnologyChanged = new SparseBooleanArray();SparseBooleanArray hasDataRegStateChanged = new SparseBooleanArray();boolean hasChanged = !mNewSS.equals(mSS);if (DBG) {log("pollStateDone:"+ " hasRegistered = " + hasRegistered+ " hasDeregistered = " + hasDeregistered+ " hasDataAttached = " + hasDataAttached+ " hasDataDetached = " + hasDataDetached+ " hasDataRegStateChanged = " + hasDataRegStateChanged+ " hasRilVoiceRadioTechnologyChanged = " + hasRilVoiceRadioTechnologyChanged+ " hasRilDataRadioTechnologyChanged = " + hasRilDataRadioTechnologyChanged+ " hasDataTransportPreferenceChanged = " + hasDataTransportPreferenceChanged+ " hasChanged = " + hasChanged+ " hasVoiceRoamingOn = " + hasVoiceRoamingOn+ " hasVoiceRoamingOff = " + hasVoiceRoamingOff+ " hasDataRoamingOn =" + hasDataRoamingOn+ " hasDataRoamingOff = " + hasDataRoaming