Android Telephony InternalsWord格式文档下载.docx

Android Telephony InternalsWord格式文档下载.docx

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PhoneStateListener 

classesrelyonthistocommunicatewithPhoneApp.The 

ServiceManager 

classisalsoused.

Tomarshalldataforremotemethods,thepackageincludesAIDLfiles.Forinstance,thefollowingAIDLcomesfrom 

IPhoneStateListener.aidl:

onewayinterfaceIPhoneStateListener{

voidonServiceStateChanged（inServiceStateserviceState）;

voidonSignalStrengthChanged（intasu）;

voidonMessageWaitingIndicatorChanged（booleanmwi）;

voidonCallForwardingIndicatorChanged（booleancfi）;

//weusebundlehereinsteadofCellLocationsoitcangettherightsubclass

voidonCellLocationChanged（inBundlelocation）;

voidonCallStateChanged（intstate,StringincomingNumber）;

voidonDataConnectionStateChanged（intstate）;

voidonDataActivity（intdirection）;

}

15.2.2.Theandroid.internal.telephonyPackage

ThispackagecontainstheclassesandinterfacesPhoneAppusestoprovideservicestootherapplicationsthatwanttostartphonecalls,andclassesthatdefineanAPItotheRIL.

PhoneApp,likeallpartsofAndroid,istheoreticallyreplaceable.IfyourapplicationneedstomodifytheclassesusedbyPhoneApp,yourapplicationwillprobablyhavetoreplaceormodifyPhoneApp,andshouldprovidethesameservicestootherapplications,usingtheclassesinthispackage.

ThedescriptionoftheseclassesshouldhelpyouunderstandhowAndroidinterfacestoamobileradio,andthecapabilitiesthatareexposed—andnotexposed—by 

PhoneApp 

tootherapplications.Thisisalargeandcomplexpackage,andacompleteunderstandingwillrequirereadingtheAndroidsourcecode.Thesedescriptionswillhelpyoufindwheretostartforyourpurposes:

ATParseEx

Extends 

RuntimeExceptionandisthrownbymethodsofthe 

ATResponseParser 

class.

ATResponseParser

Thisclassparses 

partoftheATcommandsyntaxusedtocommunicatewiththemobileradiohardwareinamobilehandset.Thisis,infact,acommandsyntaxverymuchliketheATcommandsyntaxusedbymodems,astandarddescribedinthe3GPPdocumentnumberTS27.007andrelatedspecifications.Thisprotocolforcontrollingmobileradiosiswidelyused.

Call

Thisclassisan 

abstractbaseclass.Otherclassesuseitasabasisforobjectsthatrepresentphonecallsandthestateofthosecalls.

CallerInfo

Thisclass 

holdsinformationaboutthepartythatoriginatedanincomingcall.ThisclassstartswithcallerIDinformationfromthemobilenetworkinterfaceandlooksupotherinformationaboutacallerinthedatabaseofcontacts.

CallerInfoAsyncQuery

enablesasynchronousdatabasequeriesforinformationthatcouldbefoundaboutacallerbasedonthecallerIDinformation.

CallStateException

Theclass 

extendsExceptionandisthrownbymethodsthatmaintaincallstateincaseswherestateisinconsistent.

Connection

isanabstractbaseclassusedbyotherclasses,andisabasisforobjectsthatrepresentconnectionsonthemobilenetworkandthestateoftheseconnections. 

Connection 

objectscanbeassociatedwitha 

Call 

object,buttheycanalsoexistindependently.ThedatainaConnection 

objectcanbeespeciallyusefulindiagnosingthereasonacallfailed.

DefaultPhoneNotifier

implementsthePhoneNotifierinterfaceinordertoreceivenotificationsfroma 

Phone 

object.ItthenusestheAndroidservicesystemtocommunicatestatetoActivityinstancesthathaveregisteredtoreceivethosenotifications.Seethe 

Handler 

Mailbox 

classesforinformationonhowtoreceivenotifications.

IPhoneStateListener

This 

interfacedefinesthesignaturesofmethodsanapplicationimplementstoreceivenotificationofcallstatechange,andchangestoforwardingandmessage-waitingstates.

IPhoneSubInfo

Thisinterface 

isusedtoobtainsubscriberinformation.

ITelephony

interfacedefinestheinter-processinterfaceusedinTelephonyManagertoenableapplicationstocommunicatewithPhoneApp.

ITelephonyRegistry

interfaceisthecallbackinterfacefromtheRILdaemon.

MmiCode

interfacedefinescallbacksrelatedto"

MMIcodes."

Thesearespecialnumbersausercandialandkeysequencesthatausercanenterduringacalltoaccess,control,andadministersupplementaryservices,suchascallwaiting,callhold,etc.MMIcodesandrelatedfunctionalityaredescribedinthe3GPPdocumentnumberTS22.030.

Phone

interfaceincludescallbacksandmethodsforaccessingthestateofamobilephone.

PhoneBase

classisanabstractbaseclassthatimplementsthePhoneinterface.

PhoneFactory

classcontainsmethodsusedtocreateinstancesofthe 

GSMPhone 

class,asubclassofthe 

PhoneNotifier

specifiestheAPIatelephonyimplementationusestonotifyaphonestatelistenerofstatechanges.

PhoneStateIntentReceiver

classhandles 

Intent 

objectsthathaveintenttypesspecifiedinthe 

Tele⁠pho⁠nyIn⁠tents 

class.ThisclassenablesAndroidapplicationstousetheIntentssystemtoobtainphonestateinformation.

PhoneSubInfo

containsmethodsforobtaininginformationaboutamobileservicesubscriber,suchastheuniqueidentifyingnumberforthehandset（IMEI）,theuniqueidentifyingnumberforthesubscriber（IMSI）,theserialnumberoftheSIMcard,etc.

SimCard

interfacedefinestheAPIforaccessingtheSIMcard.

TelephonyIntents

definesconstantsforbroadcastintentsthathavesimilarfunctionalitytotheTelephonyManagerAPI.

TelephonyProperties

definestheconstantsusedwiththe 

SystemProperties 

classforsettingandgettingtelephony-relatedproperties.

TheseclassesarenotdocumentedintheAndroidSDKdocumentation,butthedescriptionshereshouldgiveyousomeunderstandingofthesourcecodefortheseclasses.

15.2.3.Theandroid.internal.telephony.gsmPackage

ManyoftheclassesandinterfacesintheprevioussectionaretypicalofaJavaAPIthatcanhavemultipleimplementations.TheimplementationsoftheAPIdefinedinthe 

telephony.internal 

packagecorrespondtoalibraryusedintheRIL.TobetterunderstandthisAPI,wewilllookatoneimplementationherethatsupportsGSM.

Thus,thissectiondelvesfurtherintothetelephonyinternalsofAndroid,lookingespeciallyathowtheinterfacesandabstractbaseclassesareimplementedandsubclassedtoenableaccesstothefunctionalityofGSMtelephony.AlthoughitmayseemthatspecificationssuchasTS27.007covermobiletelephonyingeneral,thislayerofAndroidactuallyhastoaccommodatevariationsinmobiletelephonystandards.InCDMAtelephony,forinstance,theSIMcardisanoptionalpartofthestandardandisrarelypresentinCDMAhandsets.Inthiscase,thepackagedescribedinthissectionwouldbereplacedbyaCDMA-orientedpackagewithasimilararchitecturalrelationshiptothehigher-levelclassesdescribedintheprevioussection.TheRILcodeisalsospecifictothetypeoftelephonyinthehandset.

AttheRILlayer,thedifferencesbetweenGSMandCDMAaremainlyoutsidethecorefunctionalityofmakingphonecalls,soyoumaybewonderingwhyalltheselayersandAPIsarenecessary.But,asthedescriptionoftheclassesspecifictocommunicatingwithaGSMRILwillshow,thereareplentyofdifferencesindetail,suchasSIMcards,thetypeofmobiledatanetwork,etc.Thesemakeitimpracticaltodesignauniversalinterfacetomobileradios,despitetheuseofastandardprotocolforcommunicatingwiththem:

AdnRecord

Thisclassisusedtoloadandstore 

AbbreviatedDialingNumbers（ADNs）toandfromtheSIMcard.ADNsareshortnumbersusedforinformationcalls,emergencycalls,etc.

AdnRecordCache

Thisclasscaches 

andenablesaccesstoADNs.

ApnSetting

holdsdataspecifyingtheaccesspointname（APN）andotherparametersforconnectingtoGeneralPacketRadioService（GPRS）and3Gmobiledatanetworks.ThismobiledatatechnologyisspecifictoGSMnetworks.

BaseCommands

ThisclassimplementstheCommandsInterfaceinterface,whichisusedthroughoutthe 

GSM 

telephonyclassestocommunicatewiththeGSMradio.

CallFailCause

interfacedefinesconstantsfordecodingfailurecausecodes.

CallForwardInfo

Thisclassholds 

datathatcorrespondstotheparametersofacall-forwardingcommandtotheRIL.

CallTracker

mapsinformationfromtheRILtostatetransitionsforthe 

GSMCall 

CommandException

isanexceptionthrownwhentheRILreportsanerrorfromacommand.

CommandsInterface

definestheAPItotheGSMRIL.Thisinterfaceisimplementedbythe 

BaseCommands 

DataConnectionTracker

Thistracks 

thestateofGPRSpacketdataprotocol（PDP）connections.ThistypeofconnectionisspecifictoGSMmobiledata.

DataLink

implementstheDataLinkInterfaceinterfaceandisusedinthe 

PPPLink 

class,whichmanagespointtopointprotocol（PPP）linksinGPRSnetworking.

DataLinkInterface

class