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Android 5.0 呼叫流程--呼出

 James130 2015-12-04










5. Android 5.0 呼叫流程

5.1 MO call

我们先给出MO起呼过程的示例流程图,然后结合该图做代码流程的分析:



5.1.1 拨号请求(CallActivity

我们从CallActivity来开始看MO呼叫流程,在他的processIntent里处理收到的呼叫intent,目前支持3种类型的起呼呼叫,之后processOutgoingCallIntent给CallReceiver发送一个广播,完成本阶段的处理。

    private void processIntent(Intent intent) {

        // Ensure call intents are not processed on devices that are not capable of calling.

        if (!isVoiceCapable()) {

            return;

        }

 

        verifyCallAction(intent);

        String action = intent.getAction();

 

        if (Intent.ACTION_CALL.equals(action) ||

                Intent.ACTION_CALL_PRIVILEGED.equals(action) ||

                Intent.ACTION_CALL_EMERGENCY.equals(action)) {

            processOutgoingCallIntent(intent);

        } else if (TelecomManager.ACTION_INCOMING_CALL.equals(action)) {

            processIncomingCallIntent(intent);

        }

    }         

 

5.1.2 拨号请求(CallReceiver

CallReceiver是一个广播接收器,处理所有的来电和去电广播,具体来讲,处理3个广播,来电、拨号盘去电、SIM卡去电,这里分析一下拨号盘呼叫的流程,收到拨号盘的拨号请求后,调用processOutgoingCallIntent进行后续处理。

    public void onReceive(Context context, Intent intent) {

        final boolean isUnknownCall = intent.getBooleanExtra(KEY_IS_UNKNOWN_CALL, false);

        final boolean isIncomingCall = intent.getBooleanExtra(KEY_IS_INCOMING_CALL, false);

        Log.i(this, "onReceive - isIncomingCall: %s isUnknownCall: %s", isIncomingCall,

                isUnknownCall);

 

        if (isUnknownCall) {

            processUnknownCallIntent(intent);

        } else if (isIncomingCall) {

            processIncomingCallIntent(intent);

        } else {

            processOutgoingCallIntent(context, intent);

        }

    }         

 

processOutgoingCallIntent实现:

1)  获取到CallsManager的实例,并调用其方法startOutgoingCall,这里会创建一个Call实例,并通过addCall进行相关的状态维护;

2)  再新建一个NewOutgoingCallIntentBroadcaster实例,调用其方法processIntent,改变intent的一些参数,使用mCallsManager.placeOutgoingCall发起呼叫,再调用broadcastIntent发一个广播消息ACTION_NEW_OUTGOING_CALL出去。

 

呼叫发起的主要流程在placeOutgoingCall里面处理;

ACTION_NEW_OUTGOING_CALL广播的发送流程和接收器如下:

    private void broadcastIntent(

            Intent originalCallIntent,

            String number,

            boolean receiverRequired) {

        Intent broadcastIntent = new Intent(Intent.ACTION_NEW_OUTGOING_CALL);

        mContext.sendOrderedBroadcastAsUser(

                broadcastIntent,

                UserHandle.CURRENT,

                PERMISSION,

                receiverRequired ? new NewOutgoingCallBroadcastIntentReceiver() : null,

                null,  // scheduler

                Activity.RESULT_OK,  // initialCode

                number,  // initialData: initial value for the result data (number to be modified)

                null);  // initialExtras

    }  

 

Intent.ACTION_NEW_OUTGOING_CALL的定义如下,

    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)

    public static final String ACTION_NEW_OUTGOING_CALL =

            "android.intent.action.NEW_OUTGOING_CALL";         

 

通过AndroidManifest.xml,我们可以看出有两个receiver接收这个intent,

ProcessOutgoingCallTest.java (packages\services\telephony\src\com\android\phone):

UndemoteOutgoingCallReceiver.java (packages\apps\dialer\src\com\android\dialer\interactions): 

 

继续分析呼叫的处理流程,在CallsManager.placeOutgoingCall里,使用之前创建的Call实例的方法call.startCreateConnection,

    void startCreateConnection(PhoneAccountRegistrar phoneAccountRegistrar) {

        Preconditions.checkState(mCreateConnectionProcessor == null);

        mCreateConnectionProcessor = new CreateConnectionProcessor(this, mRepository, this,

                phoneAccountRegistrar, mContext);

        mCreateConnectionProcessor.process();

    } 

这里会创建一个CreateConnectionProcessor实例,并调用其process,通过attemptNextPhoneAccount,调用到service.createConnection,其中service的类型是ConnectionServiceWrapper,它是IConnectionService的子类:

    private void attemptNextPhoneAccount() {…

            ConnectionServiceWrapper service =

                    mRepository.getService(

                            attempt.connectionManagerPhoneAccount.getComponentName());

 

                service.createConnection(mCall, new Response(service));

…}

 

final class ConnectionServiceWrapper extends ServiceBinder<IConnectionService> {…}    

 

这里又涉及到binder通信,ConnectionServiceWrapper是客户端,ConnectionService是服务端,MO起呼使用了createConnection这个接口方法。

 

在ConnectionService端,onCreateOutgoingConnection会被调用到,这个方法被TelephonyConnectionService重写,TelephonyConnectionService是ConnectionService的子类和最终要实例化的类,所以ConnectionService实例的onCreateOutgoingConnection方法在TelephonyConnectionService执行,这个方法代码较多,最终它会调用placeOutgoingConnection(),

placeOutgoingConnection代码如下,它通过Phone.dial进行拨号,这个就是我们熟悉的流程了,在Android2.3、4.0、4.4都有这个拨号过程,之后将连接信息存放起来。

    private void placeOutgoingConnection(

            TelephonyConnection connection, Phone phone, ConnectionRequest request) {…

            originalConnection = phone.dial(number, request.getVideoState());

        if (originalConnection == null) {…

        } else {

            connection.setOriginalConnection(originalConnection);

        }

    }

 

 

5.1.3 拨号请求(Phone

Phone.dial是一个接口,实现的原型在basePhone.dial(dialString),basePhone是GSMPhone的父类,实际上是一个实例是GSMPhone,所以最终调用GSMPhone.dial。代码中mCT则是GsmCallTracker的实例,它在GSMPhone创建的时候被创建,GSMPhone通过它来完成呼叫相关的处理。

    public Connection

    dial (String dialString, UUSInfo uusInfo) throws CallStateException {

        GsmMmiCode mmi = GsmMmiCode.newFromDialString(networkPortion, this, mUiccApplication.get());

        if (LOCAL_DEBUG) Cclog("dialing w/ mmi '" + mmi + "'...");

        //MTK-END [mtk04070][111118][ALPS00093395]Add Cclog

 

        if (mmi == null) {

            return mCT.dial(newDialString, uusInfo);

        } else if (mmi.isTemporaryModeCLIR()) {

            return mCT.dial(mmi.dialingNumber, mmi.getCLIRMode(), uusInfo);

        } else {

            mPendingMMIs.add(mmi);

            mMmiRegistrants.notifyRegistrants(new AsyncResult(null, mmi, null));

            mmi.processCode();

 

            // FIXME should this return null or something else?

            return null;

        }

    }     

 

在GsmCallTracker的dial方法中,会先将音频通道mute,再通过mCi.dial进行拨号,之后再将状态信息更新到应用。

   synchronized Connection

    dial (String dialString, int clirMode, UUSInfo uusInfo) throws CallStateException {

        clearDisconnected();

            setMute(false);

                if (PhoneNumberUtils.isEmergencyNumber(dialString)

                    cm.emergencyDial(ret.toString(), clirMode, uusInfo, obtainCompleteMessage(EVENT_DIAL_CALL_RESULT));

                } else {

                    cm.dial(ret.toString(), clirMode, uusInfo, obtainCompleteMessage(EVENT_DIAL_CALL_RESULT));

                }

        updatePhoneState();

        phone.notifyPreciseCallStateChanged();

    }     

 

其中cm是RIL.java的实例,它在PhoneFactory.makeDefaultPhone里被实例化,然后在GsmPhone实例创建的时候,引用被传递给GsmPhone,在GsmPhone的构造函数里,调用其父类PhoneBase的构造方法,给mCi赋值为RIL的引用值,之后GsmPhone就可以使用父类的mCi了,所以mCi.dial即RIL.dial()。

    public static void makeDefaultPhone(Context context) {

                int numPhones = TelephonyManager.getDefault().getPhoneCount();

                sCommandsInterfaces = new RIL[numPhones];

                for (int i = 0; i < numPhones; i++) {

                    sCommandsInterfaces[i] = new RIL(context, networkModes[i],

                            cdmaSubscription, i);

                }

 

                for (int i = 0; i < numPhones; i++) {

                    PhoneBase phone = null;

                    int phoneType = TelephonyManager.getPhoneType(networkModes[i]);

                    if (phoneType == PhoneConstants.PHONE_TYPE_GSM) {

                        phone = new GSMPhone(context,

                                sCommandsInterfaces[i], sPhoneNotifier, i);

                    } else if (phoneType == PhoneConstants.PHONE_TYPE_CDMA) {

                        phone = new CDMALTEPhone(context,

                                sCommandsInterfaces[i], sPhoneNotifier, i);

                    }

                    Rlog.i(LOG_TAG, "Creating Phone with type = " + phoneType + " sub = " + i);

 

                    sProxyPhones[i] = new PhoneProxy(phone);

                }

…}

 

    GSMPhone (Context context, CommandsInterface ci, PhoneNotifier notifier, boolean unitTestMode) {

        super("GSM", notifier, context, ci, unitTestMode);

        mCi.setPhoneType(PhoneConstants.PHONE_TYPE_GSM);

}

 

 

    protected PhoneBase(String name, PhoneNotifier notifier, Context context, CommandsInterface ci,

            boolean unitTestMode, int phoneId) {

        mCi = ci;

}


RIL.dial实现如下,封装一个RIL_REQUEST_DIAL类型的消息发送出去,将拨号请求发送给RILD,

如果是高通平台,RILD会通过QCRIL,以及QMI,和modem进行通信,完成呼叫起呼过程;如果是MTK平台,RILD使用AT指令向modem发送呼叫请求。

对于RILD之后的处理我们暂不进行分析了。(AT\QMI及modem这部分是feature phone很常规的呼叫流程过程,不是android特色的代码。)

   public void

    dial(String address, int clirMode, UUSInfo uusInfo, Message result) {

        RILRequest rr = RILRequest.obtain(RIL_REQUEST_DIAL, result);

 

        rr.mp.writeString(address);

        rr.mp.writeInt(clirMode);

        rr.mp.writeInt(0); // UUS information is absent

 

        if (uusInfo == null) {

            rr.mp.writeInt(0); // UUS information is absent

        } else {

            rr.mp.writeInt(1); // UUS information is present

            rr.mp.writeInt(uusInfo.getType());

            rr.mp.writeInt(uusInfo.getDcs());

            rr.mp.writeByteArray(uusInfo.getUserData());

        }

        send(rr);

    }     


在GsmCallTracker的dial方法中,MTK平台还封装了一个事件为EVENT_DIAL_CALL_RESULT消息,但RIL层响应拨号请求后,被自身的handler处理。(clearDisconnected()和canDial()清空过去的非连接状态的Connections,然后检查是否可以拨打电话。接着检查foregroundCall是否处于Active状态,若是则调用switchWaitingOrHoldingAndActive将它们切换到后台,调用fakeHoldForegroundBeforeDial将前台中的连接全部切换到后台,并且状态变为HOLDING。在进行这些前期检查和准备后,创建一个GsmConnection实例即pendingMO,检查传递过来的电话号码是否有效合法,若不合法则调用pollCallsWhenSafe(),目的是将其标为dropped;若合法则设置为非静音后,调用RIL.dial进行拨号。最后,更新Phone状态并通知给注册者。)

5.       Android 5.0 呼叫流程

5.1 MO call

我们先给出MO起呼过程的示例流程图,然后结合该图做代码流程的分析:

5.1.1   拨号请求(CallActivity

我们从CallActivity来开始看MO呼叫流程,在他的processIntent里处理收到的呼叫intent,目前支持3种类型的起呼呼叫,之后processOutgoingCallIntentCallReceiver发送一个广播,完成本阶段的处理。

    private void processIntent(Intent intent) {

        // Ensure call intents are not processed on devices that are not capable of calling.

        if (!isVoiceCapable()) {

            return;

        }

 

        verifyCallAction(intent);

        String action = intent.getAction();

 

        if (Intent.ACTION_CALL.equals(action) ||

                Intent.ACTION_CALL_PRIVILEGED.equals(action) ||

                Intent.ACTION_CALL_EMERGENCY.equals(action)) {

            processOutgoingCallIntent(intent);

        } else if (TelecomManager.ACTION_INCOMING_CALL.equals(action)) {

            processIncomingCallIntent(intent);

        }

    }         

 

 5.1.2   拨号请求(CallReceiver

CallReceiver是一个广播接收器,处理所有的来电和去电广播,具体来讲,处理3个广播,来电、拨号盘去电、SIM卡去电,这里分析一下拨号盘呼叫的流程,收到拨号盘的拨号请求后,调用processOutgoingCallIntent进行后续处理。

    public void onReceive(Context context, Intent intent) {

        final boolean isUnknownCall = intent.getBooleanExtra(KEY_IS_UNKNOWN_CALL, false);

        final boolean isIncomingCall = intent.getBooleanExtra(KEY_IS_INCOMING_CALL, false);

        Log.i(this, "onReceive - isIncomingCall: %s isUnknownCall: %s", isIncomingCall,

                isUnknownCall);

 

        if (isUnknownCall) {

            processUnknownCallIntent(intent);

        } else if (isIncomingCall) {

            processIncomingCallIntent(intent);

        } else {

            processOutgoingCallIntent(context, intent);

        }

    }         

 

processOutgoingCallIntent实现:

1)  获取到CallsManager的实例,并调用其方法startOutgoingCall,这里会创建一个Call实例,并通过addCall进行相关的状态维护;

2)  再新建一个NewOutgoingCallIntentBroadcaster实例,调用其方法processIntent,改变intent的一些参数,使用mCallsManager.placeOutgoingCall发起呼叫,再调用broadcastIntent发一个广播消息ACTION_NEW_OUTGOING_CALL出去。

 

呼叫发起的主要流程在placeOutgoingCall里面处理;

ACTION_NEW_OUTGOING_CALL广播的发送流程和接收器如下:

    private void broadcastIntent(

            Intent originalCallIntent,

            String number,

            boolean receiverRequired) {

        Intent broadcastIntent = new Intent(Intent.ACTION_NEW_OUTGOING_CALL);

        mContext.sendOrderedBroadcastAsUser(

                broadcastIntent,

                UserHandle.CURRENT,

                PERMISSION,

                receiverRequired ? new NewOutgoingCallBroadcastIntentReceiver() : null,

                null,  // scheduler

                Activity.RESULT_OK,  // initialCode

                number,  // initialData: initial value for the result data (number to be modified)

                null);  // initialExtras

    }  

 

Intent.ACTION_NEW_OUTGOING_CALL的定义如下,

    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)

    public static final String ACTION_NEW_OUTGOING_CALL =

            "android.intent.action.NEW_OUTGOING_CALL";         

 

通过AndroidManifest.xml,我们可以看出有两个receiver接收这个intent

ProcessOutgoingCallTest.java (packages\services\telephony\src\com\android\phone):

UndemoteOutgoingCallReceiver.java (packages\apps\dialer\src\com\android\dialer\interactions): 

 

继续分析呼叫的处理流程,在CallsManager.placeOutgoingCall里,使用之前创建的Call实例的方法call.startCreateConnection

    void startCreateConnection(PhoneAccountRegistrar phoneAccountRegistrar) {

        Preconditions.checkState(mCreateConnectionProcessor == null);

        mCreateConnectionProcessor = new CreateConnectionProcessor(this, mRepository, this,

                phoneAccountRegistrar, mContext);

        mCreateConnectionProcessor.process();

    } 

这里会创建一个CreateConnectionProcessor实例,并调用其process,通过attemptNextPhoneAccount,调用到service.createConnection,其中service的类型是ConnectionServiceWrapper,它是IConnectionService的子类:

    private void attemptNextPhoneAccount() {…

            ConnectionServiceWrapper service =

                    mRepository.getService(

                            attempt.connectionManagerPhoneAccount.getComponentName());

 

                service.createConnection(mCall, new Response(service));

…}

 

final class ConnectionServiceWrapper extends ServiceBinder<IConnectionService> {…}    

 

这里又涉及到binder通信,ConnectionServiceWrapper是客户端,ConnectionService是服务端,MO起呼使用了createConnection这个接口方法。

 

ConnectionService端,onCreateOutgoingConnection会被调用到,这个方法被TelephonyConnectionService重写,TelephonyConnectionServiceConnectionService的子类和最终要实例化的类,所以ConnectionService实例的onCreateOutgoingConnection方法在TelephonyConnectionService执行,这个方法代码较多,最终它会调用placeOutgoingConnection(),

placeOutgoingConnection代码如下,它通过Phone.dial进行拨号,这个就是我们熟悉的流程了,在Android2.34.04.4都有这个拨号过程,之后将连接信息存放起来。

    private void placeOutgoingConnection(

            TelephonyConnection connection, Phone phone, ConnectionRequest request) {…

            originalConnection = phone.dial(number, request.getVideoState());

        if (originalConnection == null) {…

        } else {

            connection.setOriginalConnection(originalConnection);

        }

    }

 

 5.1.3         拨号请求(Phone

Phone.dial是一个接口,实现的原型在basePhone.dial(dialString)basePhoneGSMPhone的父类,实际上是一个实例是GSMPhone,所以最终调用GSMPhone.dial代码中mCT则是GsmCallTracker的实例,它在GSMPhone创建的时候被创建,GSMPhone通过它来完成呼叫相关的处理。

    public Connection

    dial (String dialString, UUSInfo uusInfo) throws CallStateException {

        GsmMmiCode mmi = GsmMmiCode.newFromDialString(networkPortion, this, mUiccApplication.get());

        if (LOCAL_DEBUG) Cclog("dialing w/ mmi '" + mmi + "'...");

        //MTK-END [mtk04070][111118][ALPS00093395]Add Cclog

 

        if (mmi == null) {

            return mCT.dial(newDialString, uusInfo);

        } else if (mmi.isTemporaryModeCLIR()) {

            return mCT.dial(mmi.dialingNumber, mmi.getCLIRMode(), uusInfo);

        } else {

            mPendingMMIs.add(mmi);

            mMmiRegistrants.notifyRegistrants(new AsyncResult(null, mmi, null));

            mmi.processCode();

 

            // FIXME should this return null or something else?

            return null;

        }

    }     

 

GsmCallTrackerdial方法中,会先将音频通道mute,再通过mCi.dial进行拨号,之后再将状态信息更新到应用。

   synchronized Connection

    dial (String dialString, int clirMode, UUSInfo uusInfo) throws CallStateException {

        clearDisconnected();

            setMute(false);

                if (PhoneNumberUtils.isEmergencyNumber(dialString)

                    cm.emergencyDial(ret.toString(), clirMode, uusInfo, obtainCompleteMessage(EVENT_DIAL_CALL_RESULT));

                } else {

                    cm.dial(ret.toString(), clirMode, uusInfo, obtainCompleteMessage(EVENT_DIAL_CALL_RESULT));

                }

        updatePhoneState();

        phone.notifyPreciseCallStateChanged();

    }     

 

 

其中cmRIL.java的实例,它在PhoneFactory.makeDefaultPhone里被实例化,然后在GsmPhone实例创建的时候,引用被传递给GsmPhone,在GsmPhone的构造函数里,调用其父类PhoneBase的构造方法,给mCi赋值为RIL的引用值,之后GsmPhone就可以使用父类的mCi了,所以mCi.dialRIL.dial()

    public static void makeDefaultPhone(Context context) {

                int numPhones = TelephonyManager.getDefault().getPhoneCount();

                sCommandsInterfaces = new RIL[numPhones];

                for (int i = 0; i < numPhones; i++) {

                    sCommandsInterfaces[i] = new RIL(context, networkModes[i],

                            cdmaSubscription, i);

                }

 

                for (int i = 0; i < numPhones; i++) {

                    PhoneBase phone = null;

                    int phoneType = TelephonyManager.getPhoneType(networkModes[i]);

                    if (phoneType == PhoneConstants.PHONE_TYPE_GSM) {

                        phone = new GSMPhone(context,

                                sCommandsInterfaces[i], sPhoneNotifier, i);

                    } else if (phoneType == PhoneConstants.PHONE_TYPE_CDMA) {

                        phone = new CDMALTEPhone(context,

                                sCommandsInterfaces[i], sPhoneNotifier, i);

                    }

                    Rlog.i(LOG_TAG, "Creating Phone with type = " + phoneType + " sub = " + i);

 

                    sProxyPhones[i] = new PhoneProxy(phone);

                }

…}

 

 

    GSMPhone (Context context, CommandsInterface ci, PhoneNotifier notifier, boolean unitTestMode) {

        super("GSM", notifier, context, ci, unitTestMode);

        mCi.setPhoneType(PhoneConstants.PHONE_TYPE_GSM);

}

 

 

    protected PhoneBase(String name, PhoneNotifier notifier, Context context, CommandsInterface ci,

            boolean unitTestMode, int phoneId) {

        mCi = ci;

}

 

 

RIL.dial实现如下,封装一个RIL_REQUEST_DIAL类型的消息发送出去,将拨号请求发送给RILD

如果是高通平台,RILD会通过QCRIL,以及QMI,和modem进行通信,完成呼叫起呼过程;如果是MTK平台,RILD使用AT指令向modem发送呼叫请求。

对于RILD之后的处理我们暂不进行分析了。(AT\QMImodem这部分是feature phone很常规的呼叫流程过程,不是android特色的代码。)

   public void

    dial(String address, int clirMode, UUSInfo uusInfo, Message result) {

        RILRequest rr = RILRequest.obtain(RIL_REQUEST_DIAL, result);

 

        rr.mp.writeString(address);

        rr.mp.writeInt(clirMode);

        rr.mp.writeInt(0); // UUS information is absent

 

        if (uusInfo == null) {

            rr.mp.writeInt(0); // UUS information is absent

        } else {

            rr.mp.writeInt(1); // UUS information is present

            rr.mp.writeInt(uusInfo.getType());

            rr.mp.writeInt(uusInfo.getDcs());

            rr.mp.writeByteArray(uusInfo.getUserData());

        }

        send(rr);

    }     

GsmCallTrackerdial方法中,MTK平台还封装了一个事件为EVENT_DIAL_CALL_RESULT消息,但RIL层响应拨号请求后,被自身的handler处理。(clearDisconnected()canDial()清空过去的非连接状态的Connections,然后检查是否可以拨打电话。接着检查foregroundCall是否处于Active状态,若是则调用switchWaitingOrHoldingAndActive将它们切换到后台,调用fakeHoldForegroundBeforeDial将前台中的连接全部切换到后台,并且状态变为HOLDING。在进行这些前期检查和准备后,创建一个GsmConnection实例即pendingMO,检查传递过来的电话号码是否有效合法,若不合法则调用pollCallsWhenSafe(),目的是将其标为dropped;若合法则设置为非静音后,调用RIL.dial进行拨号。最后,更新Phone状态并通知给注册者。)


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