本文以 Android 7.0 爲源碼，對PhoneAPP 啓動及 相關 Telephony 類的加載進行簡單介紹
1、PhoneAPP 的啓動
爲了瞭解 PhoneAPP 是如何啓動的，首先讓我們看下對應 配置文件 AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:androidprv="http://schemas.android.com/apk/prv/res/android"
package="com.android.phone"
coreApp="true"
android:sharedUserId="android.uid.phone"
android:sharedUserLabel="@string/phoneAppLabel"
>
.....
<application android:name="PhoneApp"
android:persistent="true"
android:label="@string/phoneAppLabel"
android:icon="@mipmap/ic_launcher_phone"
android:allowBackup="false"
android:supportsRtl="true"
android:usesCleartextTraffic="true"
android:defaultToDeviceProtectedStorage="true"
android:directBootAware="true">
....如上，關注到兩個重要屬性：persistent 爲 true 表示應用是常駐的，directBootAware 爲 true 表示應用是可直接啓動的，這兩個字段決定了PhoneApp開機後，將被ActivityManagerService啓動。
總的說來，開機由SystemServer進程創建出AM和PM，PM會加載Application的信息。 當AM的SystemReady被調用後，將利用PM得到persistent和directBootAware屬性值爲 true的應用列表，PhoneApp就在其中。 AM利用socket向zygote發送消息，啓動PhoneApp對應的進程。 zygote進程啓動PhoneApp進程後，將利用反射調用PhoneApp中ActivityThread的main函數。 ActivityThread的main函數被調用後，將利用binder通信向AM發送消息；AM進行對應的處理，處理完成後，同樣利用binder通信將處理結果返回給ActivityThread。 最後ActivityThread收到處理結果後，完成最後的準備工作（設置參數之類），並調用PhoneApp的onCreate函數。（來自ZhangJianIsAStark）
PS：從 Android N 開始，在首次開機時，在用戶尚未來得及解鎖設備之前，設備可直接啓動到一種名爲 Direct Boot（直接啓動）的新模式中。在此模式下，操作系統可以全功能運行，但不允許訪問私有應用數據，只能運行經過更新、可支持直接啓動功能的應用。
2、PhoneAPP 啓動後相關類加載關係圖
3、相關代碼說明
packages/services/Telephony/src/com/android/phone/PhoneGlobals.java
public void onCreate() {
if (VDBG) Log.v(LOG_TAG, "onCreate()...");
ContentResolver resolver = getContentResolver();
// Cache the "voice capable" flag.
// This flag currently comes from a resource (which is
// overrideable on a per-product basis):
sVoiceCapable =
getResources().getBoolean(com.android.internal.R.bool.config_voice_capable);
// ...but this might eventually become a PackageManager "system
// feature" instead, in which case we'd do something like:
// sVoiceCapable =
// getPackageManager().hasSystemFeature(PackageManager.FEATURE_TELEPHONY_VOICE_CALLS);
if (mCM == null) {
// Initialize the telephony framework
PhoneFactory.makeDefaultPhones(this);
// Start TelephonyDebugService After the default phone is created.
Intent intent = new Intent(this, TelephonyDebugService.class);
startService(intent);
mCM = CallManager.getInstance();
for (Phone phone : PhoneFactory.getPhones()) {
mCM.registerPhone(phone);
}
// Create the NotificationMgr singleton, which is used to display
// status bar icons and control other status bar behavior.
notificationMgr = NotificationMgr.init(this);
// If PhoneGlobals has crashed and is being restarted, then restart.
mHandler.sendEmptyMessage(EVENT_RESTART_SIP);
// Create an instance of CdmaPhoneCallState and initialize it to IDLE
cdmaPhoneCallState = new CdmaPhoneCallState();
cdmaPhoneCallState.CdmaPhoneCallStateInit();
// before registering for phone state changes
mPowerManager = (PowerManager) getSystemService(Context.POWER_SERVICE);
mWakeLock = mPowerManager.newWakeLock(PowerManager.FULL_WAKE_LOCK, LOG_TAG);
// lock used to keep the processor awake, when we don't care for the display.
mPartialWakeLock = mPowerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK
| PowerManager.ON_AFTER_RELEASE, LOG_TAG);
mKeyguardManager = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);
// Get UpdateLock to suppress system-update related events (e.g. dialog show-up)
// during phone calls.
mUpdateLock = new UpdateLock("phone");
if (DBG) Log.d(LOG_TAG, "onCreate: mUpdateLock: " + mUpdateLock);
CallLogger callLogger = new CallLogger(this, new CallLogAsync());
callGatewayManager = CallGatewayManager.getInstance();
// Create the CallController singleton, which is the interface
// to the telephony layer for user-initiated telephony functionality
// (like making outgoing calls.)
callController = CallController.init(this, callLogger, callGatewayManager);
// Create the CallerInfoCache singleton, which remembers custom ring tone and
// send-to-voicemail settings.
//
// The asynchronous caching will start just after this call.
callerInfoCache = CallerInfoCache.init(this);
phoneMgr = PhoneInterfaceManager.init(this, PhoneFactory.getDefaultPhone());
configLoader = CarrierConfigLoader.init(this);
// Create the CallNotifer singleton, which handles
// asynchronous events from the telephony layer (like
// launching the incoming-call UI when an incoming call comes
// in.)
notifier = CallNotifier.init(this);
// A-28074:zhaojian at 20170224 for CMCC NetworkType
boolean isCmccDeepCoopMode = this.getPackageManager().hasSystemFeature(LeFeatures.TELEPHONY_CMCC_NETWORK_TYPE_DEEP_COOP);
if (isCmccDeepCoopMode) {
leCmccDeepCoopHandler = new LeCmccDeepCoopHandler(this);
}
// E-28074:zhaojian at 20170224 for CMCC NetworkType
PhoneUtils.registerIccStatus(mHandler, EVENT_SIM_NETWORK_LOCKED);
// register for MMI/USSD
mCM.registerForMmiComplete(mHandler, MMI_COMPLETE, null);
// register connection tracking to PhoneUtils
PhoneUtils.initializeConnectionHandler(mCM);
// Register for misc other intent broadcasts.
IntentFilter intentFilter =
new IntentFilter(Intent.ACTION_AIRPLANE_MODE_CHANGED);
intentFilter.addAction(TelephonyIntents.ACTION_ANY_DATA_CONNECTION_STATE_CHANGED);
intentFilter.addAction(TelephonyIntents.ACTION_SIM_STATE_CHANGED);
intentFilter.addAction(TelephonyIntents.ACTION_RADIO_TECHNOLOGY_CHANGED);
intentFilter.addAction(TelephonyIntents.ACTION_SERVICE_STATE_CHANGED);
intentFilter.addAction(TelephonyIntents.ACTION_EMERGENCY_CALLBACK_MODE_CHANGED);
intentFilter.addAction(TelephonyIntents.ACTION_DEFAULT_DATA_SUBSCRIPTION_CHANGED);
registerReceiver(mReceiver, intentFilter);
//set the default values for the preferences in the phone.
PreferenceManager.setDefaultValues(this, R.xml.network_setting, false);
PreferenceManager.setDefaultValues(this, R.xml.call_feature_setting, false);
// Make sure the audio mode (along with some
// audio-mode-related state of our own) is initialized
// correctly, given the current state of the phone.
PhoneUtils.setAudioMode(mCM);
}
cdmaOtaProvisionData = new OtaUtils.CdmaOtaProvisionData();
cdmaOtaConfigData = new OtaUtils.CdmaOtaConfigData();
cdmaOtaScreenState = new OtaUtils.CdmaOtaScreenState();
cdmaOtaInCallScreenUiState = new OtaUtils.CdmaOtaInCallScreenUiState();
simActivationManager = new SimActivationManager();
// XXX pre-load the SimProvider so that it's ready
resolver.getType(Uri.parse("content://icc/adn"));
// TODO: Register for Cdma Information Records
// phone.registerCdmaInformationRecord(mHandler, EVENT_UNSOL_CDMA_INFO_RECORD, null);
// Read HAC settings and configure audio hardware
if (getResources().getBoolean(R.bool.hac_enabled)) {
int hac = android.provider.Settings.System.getInt(
getContentResolver(),
android.provider.Settings.System.HEARING_AID,
0);
AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audioManager.setParameter(SettingsConstants.HAC_KEY,
hac == SettingsConstants.HAC_ENABLED
? SettingsConstants.HAC_VAL_ON : SettingsConstants.HAC_VAL_OFF);
}
}frameworks/opt/telephony/src/java/com/android/internal/telephony/PhoneFactory.java
public static void makeDefaultPhone(Context context) {
synchronized (sLockProxyPhones) {
if (!sMadeDefaults) {
sContext = context;
// create the telephony device controller.
TelephonyDevController.create();
int retryCount = 0;
for(;;) {
boolean hasException = false;
retryCount ++;
try {
// use UNIX domain socket to
// prevent subsequent initialization
new LocalServerSocket("com.android.internal.telephony");
} catch (java.io.IOException ex) {
hasException = true;
}
if ( !hasException ) {
break;
} else if (retryCount > SOCKET_OPEN_MAX_RETRY) {
throw new RuntimeException("PhoneFactory probably already running");
} else {
try {
Thread.sleep(SOCKET_OPEN_RETRY_MILLIS);
} catch (InterruptedException er) {
}
}
}
sPhoneNotifier = new DefaultPhoneNotifier();
TelephonyComponentFactory telephonyComponentFactory
= TelephonyComponentFactory.getInstance();
int cdmaSubscription = CdmaSubscriptionSourceManager.getDefault(context);
Rlog.i(LOG_TAG, "Cdma Subscription set to " + cdmaSubscription);
/* In case of multi SIM mode two instances of Phone, RIL are created,
where as in single SIM mode only instance. isMultiSimEnabled() function checks
whether it is single SIM or multi SIM mode */
int numPhones = TelephonyManager.getDefault().getPhoneCount();
int[] networkModes = new int[numPhones];
sPhones = new Phone[numPhones];
sCommandsInterfaces = new RIL[numPhones];
sTelephonyNetworkFactories = new TelephonyNetworkFactory[numPhones];
for (int i = 0; i < numPhones; i++) {
// reads the system properties and makes commandsinterface
// Get preferred network type.
networkModes[i] = RILConstants.PREFERRED_NETWORK_MODE;
Rlog.i(LOG_TAG, "Network Mode set to " + Integer.toString(networkModes[i]));
sCommandsInterfaces[i] = new RIL(context, networkModes[i],
cdmaSubscription, i);
}
Rlog.i(LOG_TAG, "Creating SubscriptionController");
telephonyComponentFactory.initSubscriptionController(
context, sCommandsInterfaces);
// Instantiate UiccController so that all other classes can just
// call getInstance()
sUiccController = UiccController.make(context, sCommandsInterfaces);
for (int i = 0; i < numPhones; i++) {
Phone phone = null;
int phoneType = TelephonyManager.getPhoneType(networkModes[i]);
if (phoneType == PhoneConstants.PHONE_TYPE_GSM) {
phone = telephonyComponentFactory.makePhone(context,
sCommandsInterfaces[i], sPhoneNotifier, i,
PhoneConstants.PHONE_TYPE_GSM,
telephonyComponentFactory);
} else if (phoneType == PhoneConstants.PHONE_TYPE_CDMA) {
phone = telephonyComponentFactory.makePhone(context,
sCommandsInterfaces[i], sPhoneNotifier, i,
PhoneConstants.PHONE_TYPE_CDMA_LTE,
telephonyComponentFactory);
}
Rlog.i(LOG_TAG, "Creating Phone with type = " + phoneType + " sub = " + i);
sPhones[i] = phone;
}
// Set the default phone in base class.
// FIXME: This is a first best guess at what the defaults will be. It
// FIXME: needs to be done in a more controlled manner in the future.
sPhone = sPhones[0];
sCommandsInterface = sCommandsInterfaces[0];
// Ensure that we have a default SMS app. Requesting the app with
// updateIfNeeded set to true is enough to configure a default SMS app.
ComponentName componentName =
SmsApplication.getDefaultSmsApplication(context, true /* updateIfNeeded */);
String packageName = "NONE";
if (componentName != null) {
packageName = componentName.getPackageName();
}
Rlog.i(LOG_TAG, "defaultSmsApplication: " + packageName);
// Set up monitor to watch for changes to SMS packages
SmsApplication.initSmsPackageMonitor(context);
sMadeDefaults = true;
Rlog.i(LOG_TAG, "Creating SubInfoRecordUpdater ");
sSubInfoRecordUpdater = telephonyComponentFactory.makeSubscriptionInfoUpdater(
context, sPhones, sCommandsInterfaces);
SubscriptionController.getInstance().updatePhonesAvailability(sPhones);
// Start monitoring after defaults have been made.
// Default phone must be ready before ImsPhone is created
// because ImsService might need it when it is being opened.
for (int i = 0; i < numPhones; i++) {
sPhones[i].startMonitoringImsService();
}
ITelephonyRegistry tr = ITelephonyRegistry.Stub.asInterface(
ServiceManager.getService("telephony.registry"));
SubscriptionController sc = SubscriptionController.getInstance();
sSubscriptionMonitor = new SubscriptionMonitor(tr, sContext, sc, numPhones);
sPhoneSwitcher = telephonyComponentFactory.
makePhoneSwitcher (MAX_ACTIVE_PHONES, numPhones,
sContext, sc, Looper.myLooper(), tr, sCommandsInterfaces,
sPhones);
sProxyController = ProxyController.getInstance(context, sPhones,
sUiccController, sCommandsInterfaces, sPhoneSwitcher);
sTelephonyNetworkFactories = new TelephonyNetworkFactory[numPhones];
for (int i = 0; i < numPhones; i++) {
sTelephonyNetworkFactories[i] = new TelephonyNetworkFactory(
sPhoneSwitcher, sc, sSubscriptionMonitor, Looper.myLooper(),
sContext, i, sPhones[i].mDcTracker);
}
telephonyComponentFactory.makeExtTelephonyClasses(
context, sPhones, sCommandsInterfaces);
}
}
}frameworks/opt/telephony/src/java/com/android/internal/telephony/GsmCdmaPhone.java
public GsmCdmaPhone(Context context, CommandsInterface ci, PhoneNotifier notifier,
boolean unitTestMode, int phoneId, int precisePhoneType,
TelephonyComponentFactory telephonyComponentFactory) {
super(precisePhoneType == PhoneConstants.PHONE_TYPE_GSM ? "GSM" : "CDMA",
notifier, context, ci, unitTestMode, phoneId, telephonyComponentFactory);
// phone type needs to be set before other initialization as other objects rely on it
mPrecisePhoneType = precisePhoneType;
initOnce(ci);
initRatSpecific(precisePhoneType);
mSST = mTelephonyComponentFactory.makeServiceStateTracker(this, this.mCi);
// DcTracker uses SST so needs to be created after it is instantiated
mDcTracker = mTelephonyComponentFactory.makeDcTracker(this);
mSST.registerForNetworkAttached(this, EVENT_REGISTERED_TO_NETWORK, null);
logd("GsmCdmaPhone: constructor: sub = " + mPhoneId);
}
private void initOnce(CommandsInterface ci) {
if (ci instanceof SimulatedRadioControl) {
mSimulatedRadioControl = (SimulatedRadioControl) ci;
}
mCT = mTelephonyComponentFactory.makeGsmCdmaCallTracker(this);
mIccPhoneBookIntManager = mTelephonyComponentFactory.makeIccPhoneBookInterfaceManager(this);
PowerManager pm
= (PowerManager) mContext.getSystemService(Context.POWER_SERVICE);
mWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, LOG_TAG);
mIccSmsInterfaceManager = mTelephonyComponentFactory.makeIccSmsInterfaceManager(this);
mIccCardProxy = mTelephonyComponentFactory.makeIccCardProxy(mContext, mCi, mPhoneId);
mCi.registerForAvailable(this, EVENT_RADIO_AVAILABLE, null);
mCi.registerForOffOrNotAvailable(this, EVENT_RADIO_OFF_OR_NOT_AVAILABLE, null);
mCi.registerForOn(this, EVENT_RADIO_ON, null);
mCi.setOnSuppServiceNotification(this, EVENT_SSN, null);
//GSM
mCi.setOnUSSD(this, EVENT_USSD, null);
mCi.setOnSs(this, EVENT_SS, null);
//CDMA
mCdmaSSM = mTelephonyComponentFactory.getCdmaSubscriptionSourceManagerInstance(mContext,
mCi, this, EVENT_CDMA_SUBSCRIPTION_SOURCE_CHANGED, null);
mEriManager = mTelephonyComponentFactory.makeEriManager(this, mContext,
EriManager.ERI_FROM_XML);
mCi.setEmergencyCallbackMode(this, EVENT_EMERGENCY_CALLBACK_MODE_ENTER, null);
mCi.registerForExitEmergencyCallbackMode(this, EVENT_EXIT_EMERGENCY_CALLBACK_RESPONSE,
null);
// get the string that specifies the carrier OTA Sp number
mCarrierOtaSpNumSchema = TelephonyManager.from(mContext).getOtaSpNumberSchemaForPhone(
getPhoneId(), "");
mResetModemOnRadioTechnologyChange = SystemProperties.getBoolean(
TelephonyProperties.PROPERTY_RESET_ON_RADIO_TECH_CHANGE, false);
mCi.registerForRilConnected(this, EVENT_RIL_CONNECTED, null);
mCi.registerForVoiceRadioTechChanged(this, EVENT_VOICE_RADIO_TECH_CHANGED, null);
mContext.registerReceiver(mBroadcastReceiver, new IntentFilter(
CarrierConfigManager.ACTION_CARRIER_CONFIG_CHANGED));
}
private void initRatSpecific(int precisePhoneType) {
mPendingMMIs.clear();
mIccPhoneBookIntManager.updateIccRecords(null);
mEsn = null;
mMeid = null;
mPrecisePhoneType = precisePhoneType;
logd("Precise phone type " + mPrecisePhoneType);
TelephonyManager tm = TelephonyManager.from(mContext);
if (isPhoneTypeGsm()) {
mCi.setPhoneType(PhoneConstants.PHONE_TYPE_GSM);
tm.setPhoneType(getPhoneId(), PhoneConstants.PHONE_TYPE_GSM);
mIccCardProxy.setVoiceRadioTech(ServiceState.RIL_RADIO_TECHNOLOGY_UMTS);
} else {
mCdmaSubscriptionSource = mCdmaSSM.getCdmaSubscriptionSource();
// This is needed to handle phone process crashes
String inEcm = SystemProperties.get(TelephonyProperties.PROPERTY_INECM_MODE, "false");
mIsPhoneInEcmState = inEcm.equals("true");
if (mIsPhoneInEcmState) {
// Send a message which will invoke handleExitEmergencyCallbackMode
mCi.exitEmergencyCallbackMode(
obtainMessage(EVENT_EXIT_EMERGENCY_CALLBACK_RESPONSE));
}
mCi.setPhoneType(PhoneConstants.PHONE_TYPE_CDMA);
tm.setPhoneType(getPhoneId(), PhoneConstants.PHONE_TYPE_CDMA);
mIccCardProxy.setVoiceRadioTech(ServiceState.RIL_RADIO_TECHNOLOGY_1xRTT);
// Sets operator properties by retrieving from build-time system property
String operatorAlpha = SystemProperties.get("ro.cdma.home.operator.alpha");
String operatorNumeric = SystemProperties.get(PROPERTY_CDMA_HOME_OPERATOR_NUMERIC);
logd("init: operatorAlpha='" + operatorAlpha
+ "' operatorNumeric='" + operatorNumeric + "'");
if (mUiccController.getUiccCardApplication(mPhoneId, UiccController.APP_FAM_3GPP) ==
null || isPhoneTypeCdmaLte() || isPhoneTypeCdma()) {
if (!TextUtils.isEmpty(operatorAlpha)) {
logd("init: set 'gsm.sim.operator.alpha' to operator='" + operatorAlpha + "'");
tm.setSimOperatorNameForPhone(mPhoneId, operatorAlpha);
}
if (!TextUtils.isEmpty(operatorNumeric)) {
logd("init: set 'gsm.sim.operator.numeric' to operator='" + operatorNumeric +
"'");
logd("update icc_operator_numeric=" + operatorNumeric);
tm.setSimOperatorNumericForPhone(mPhoneId, operatorNumeric);
SubscriptionController.getInstance().setMccMnc(operatorNumeric, getSubId());
// Sets iso country property by retrieving from build-time system property
setIsoCountryProperty(operatorNumeric);
// Updates MCC MNC device configuration information
logd("update mccmnc=" + operatorNumeric);
MccTable.updateMccMncConfiguration(mContext, operatorNumeric, false);
}
}
// Sets current entry in the telephony carrier table
updateCurrentCarrierInProvider(operatorNumeric);
}
}