android拨号流程

今天学习”android中的拨号流程”&＃xff0c;大部分情况&＃xff0c;用户是通过dialer输入号码&＃xff0c;拨号通话的&＃xff0c;那么就从dialer开始吧。

DialpadFragment

DialpadFragment是拨打电话界面,当点击拨打电话按钮会回调其onClick方法&＃xff1a;

public void onClick(View view) {switch (view.getId()) {case R.id.dialpad_floating_action_button:view.performHapticFeedback(HapticFeedbackConstants.VIRTUAL_KEY);handleDialButtonPressed();break;....}
}

handleDialButtonPress方法中&＃xff0c;主要代码如下&＃xff1a;

private void handleDialButtonPressed() {....final Intent intent &＃61; CallUtil.getCallIntent(number);if (!isDigitsShown) {// must be dial conference add extraintent.putExtra(EXTRA_DIAL_CONFERENCE_URI, true);}intent.putExtra(ADD_PARTICIPANT_KEY, mAddParticipant && isPhoneInUse());DialerUtils.startActivityWithErrorToast(getActivity(), intent);hideAndClearDialpad(false);....}

CallUtil#getCallIntent

可以看到这里构造了一个intent,并且启动了该intent对应的activity

public static Intent getCallIntent(String number) {return getCallIntent(getCallUri(number));
}public static Intent getCallIntent(Uri uri) {return new Intent(Intent.ACTION_CALL, uri);
}


Intent.ACTION_CALL这样的action对应的是/packages/services/Telephony模块中的OutgoingCallBroadcaster类,该类是一个activity

<activity android:name&＃61;"OutgoingCallBroadcaster"android:enabled&＃61;"false"android:theme&＃61;"&＃64;style/OutgoingCallBroadcasterTheme"android:permission&＃61;"android.permission.CALL_PHONE"android:screenOrientation&＃61;"nosensor"android:configChanges&＃61;"orientation|screenSize|keyboardHidden"android:excludeFromRecents&＃61;"true"><intent-filter><action android:name&＃61;"android.intent.action.CALL" /><category android:name&＃61;"android.intent.category.DEFAULT" /><data android:scheme&＃61;"tel" />intent-filter><intent-filter android:icon&＃61;"&＃64;drawable/ic_launcher_sip_call"><action android:name&＃61;"android.intent.action.CALL" /><category android:name&＃61;"android.intent.category.DEFAULT" /><data android:scheme&＃61;"sip" />intent-filter><intent-filter><action android:name&＃61;"android.intent.action.CALL" /><category android:name&＃61;"android.intent.category.DEFAULT" /><data android:scheme&＃61;"voicemail" />intent-filter><intent-filter><action android:name&＃61;"android.intent.action.CALL" /><category android:name&＃61;"android.intent.category.DEFAULT" /><data android:mimeType&＃61;"vnd.android.cursor.item/phone" /><data android:mimeType&＃61;"vnd.android.cursor.item/phone_v2" /><data android:mimeType&＃61;"vnd.android.cursor.item/person" />intent-filter>
activity>

OutgoingCallBroadcaster

此时程序进入了OutgoingCallBroadcaster类

&＃64;Override
protected void onCreate(Bundle icicle) {super.onCreate(icicle);setContentView(R.layout.outgoing_call_broadcaster);....//　调用processIntent处理传递过来的intentprocessIntent(intent);....
}

processIntent方法主要处理下面三种action

• CALL (action for usual outgoing voice calls)
• CALL_PRIVILEGED (can come from built-in apps like contacts / voice dialer / bluetooth)
• CALL_EMERGENCY (from the EmergencyDialer that’s reachable from the lockscreen.)
• 对于数据为tel: URI的电话处理流程为&＃xff1a;OutgoingCallReceiver -> SipCallOptionHandler ->InCallScreen.
• 对于数据为sip: URI的网络电话&＃xff0c;则跳过NEW_OUTGOING_CALL广播&＃xff0c;直接调用SipCallOptionHandler ->InCallScreen
• 对于数据为voicemail: URIs的语音信箱处理同电话处理流程类似

OutgoingCallBroadcaster#processIntent

private void processIntent(Intent intent) {final Configuration configuration &＃61; getResources().getConfiguration();// 如果当前设备不具有语音通信能力,则直接返回if (!PhoneGlobals.sVoiceCapable) {handleNonVoiceCapable(intent);return;}String action &＃61; intent.getAction();String number &＃61; PhoneNumberUtils.getNumberFromIntent(intent, this);// Check the number, don&＃39;t convert for sip uriif (number !&＃61; null) {if (!PhoneNumberUtils.isUriNumber(number)) {number &＃61; PhoneNumberUtils.convertKeypadLettersToDigits(number);number &＃61; PhoneNumberUtils.stripSeparators(number);}} else {Log.w(TAG, "The number obtained from Intent is null.");}// 下面代码获取调用Intent.ACTION_CALL所在包&＃xff0c;检查当前包是否具有拨打电话的权限AppOpsManager appOps &＃61; (AppOpsManager)getSystemService(Context.APP_OPS_SERVICE);int launchedFromUid;String launchedFromPackage;try {// 获取启动"ACTION_CALL"的uid和packagelaunchedFromUid &＃61; ActivityManagerNative.getDefault().getLaunchedFromUid(getActivityToken());launchedFromPackage &＃61; ActivityManagerNative.getDefault().getLaunchedFromPackage(getActivityToken());} catch (RemoteException e) {launchedFromUid &＃61; -1;launchedFromPackage &＃61; null;}// 若当前UID和所在的package不具有"OP_CALL_PHONE"权限&＃xff0c;则直接返回if (appOps.noteOpNoThrow(AppOpsManager.OP_CALL_PHONE, launchedFromUid, launchedFromPackage)!&＃61; AppOpsManager.MODE_ALLOWED) {Log.w(TAG, "Rejecting call from uid " &＃43; launchedFromUid &＃43; " package "&＃43; launchedFromPackage);finish();return;}// 如果callNow是true,表示当前是一个类似于紧急拨号的特殊通话,此时直接开启通话,就不会走NEW_OUTGOING_CALLboolean callNow;// 对于紧急号码和非紧急号码设置不同的actionfinal boolean isExactEmergencyNumber &＃61;(number !&＃61; null) && PhoneNumberUtils.isLocalEmergencyNumber(this, number);final boolean isPotentialEmergencyNumber &＃61;(number !&＃61; null) && PhoneNumberUtils.isPotentialLocalEmergencyNumber(this, number);if (Intent.ACTION_CALL_PRIVILEGED.equals(action)) {if (isPotentialEmergencyNumber) {action &＃61; Intent.ACTION_CALL_EMERGENCY;} else {action &＃61; Intent.ACTION_CALL;}intent.setAction(action);}// 当用户输入的号码为空的时候&＃xff0c;intent.getBooleanExtra(EXTRA_SEND_EMPTY_FLASH, false) &＃61;&＃61; trueif (intent.getBooleanExtra(EXTRA_SEND_EMPTY_FLASH, false)) {PhoneUtils.sendEmptyFlash(PhoneGlobals.getPhone());finish();return;} else {callNow &＃61; true;}....if (callNow) {// 如果是紧急号码或者输入的号码合法&＃xff0c;则直接跳转到InCallScreen界面PhoneGlobals.getInstance().callController.placeCall(intent);}// 构造一个"ACTION_NEW_OUTGOING_CALL" intentIntent broadcastIntent &＃61; new Intent(Intent.ACTION_NEW_OUTGOING_CALL);if (number !&＃61; null) {broadcastIntent.putExtra(Intent.EXTRA_PHONE_NUMBER, number);}CallGatewayManager.checkAndCopyPhoneProviderExtras(intent, broadcastIntent);broadcastIntent.putExtra(EXTRA_ALREADY_CALLED, callNow);broadcastIntent.putExtra(EXTRA_ORIGINAL_URI, uri.toString());broadcastIntent.addFlags(Intent.FLAG_RECEIVER_FOREGROUND);// 发送一个打电话超时的messagemHandler.sendEmptyMessageDelayed(EVENT_OUTGOING_CALL_TIMEOUT,OUTGOING_CALL_TIMEOUT_THRESHOLD);//　主要会发送根据构造出的intent,发送一个有序广播,并且在OutgoingCallReceiver中处理sendOrderedBroadcastAsUser(broadcastIntent, UserHandle.OWNER,android.Manifest.permission.PROCESS_OUTGOING_CALLS,AppOpsManager.OP_PROCESS_OUTGOING_CALLS,new OutgoingCallReceiver(),null, // schedulerActivity.RESULT_OK, // initialCodenumber, // initialData: initial value for the result datanull); // initialExtras
}


CallController#placeCall

public void placeCall(Intent intent) {....if (!(Intent.ACTION_CALL.equals(action)|| Intent.ACTION_CALL_EMERGENCY.equals(action)|| Intent.ACTION_CALL_PRIVILEGED.equals(action))) {Log.wtf(TAG, "placeCall: unexpected intent action " &＃43; action);throw new IllegalArgumentException("Unexpected action: " &＃43; action);}// Check to see if this is an OTASP call (the "activation" call// used to provision CDMA devices), and if so, do some// OTASP-specific setup.Phone phone &＃61; mApp.mCM.getDefaultPhone();if (TelephonyCapabilities.supportsOtasp(phone)) {checkForOtaspCall(intent);}mApp.setRestoreMuteOnInCallResume(false);CallStatusCode status &＃61; placeCallInternal(intent);switch (status) {// Call was placed successfully:case SUCCESS:case EXITED_ECM:if (DBG) log("&＃61;&＃61;> placeCall(): success from placeCallInternal(): " &＃43; status);break;default:log("&＃61;&＃61;> placeCall(): failure code from placeCallInternal(): " &＃43; status);handleOutgoingCallError(status);break;}// 最终无论如何都会显示InCallScreen,并且根据当前错误码状态显示指定的错误提示信息}


CallController#placeCallInternal

private CallStatusCode placeCallInternal(Intent intent) {....int callStatus &＃61; PhoneUtils.placeCall(mApp,phone,number,contactUri,(isEmergencyNumber || isEmergencyIntent),rawGatewayInfo,mCallGatewayManager);....
}


PhoneUtils#placeCall

public static int placeCall(Context context, Phone phone, String number, Uri contactRef,boolean isEmergencyCall, RawGatewayInfo gatewayInfo, CallGatewayManager callGateway) {....int status &＃61; CALL_STATUS_DIALED;try {// 和RIL建立连接,mCM是PhoneGlobals的属性同时是CallManager类型connection &＃61; app.mCM.dial(phone, numberToDial, VideoProfile.STATE_AUDIO_ONLY);} catch (CallStateException ex) {return CALL_STATUS_FAILED;}if (null &＃61;&＃61; connection) {status &＃61; CALL_STATUS_FAILED;} //startGetCallerInfo(context, connection, null, null, gatewayInfo);// 设置音频相关setAudioMode();final boolean speakerActivated &＃61; activateSpeakerIfDocked(phone);final BluetoothManager btManager &＃61; app.getBluetoothManager();if (initiallyIdle && !speakerActivated && isSpeakerOn(app)&& !btManager.isBluetoothHeadsetAudioOn()) {PhoneUtils.turnOnSpeaker(app, false, true);}....return status;
}

CallManager#dial

public Connection dial(Phone phone, String dialString, int videoState)throws CallStateException {Phone basePhone &＃61; getPhoneBase(phone);int subId &＃61; phone.getSubId();Connection result;// 检查当前手机状态是否可以拨打电话if (!canDial(phone)) {String newDialString &＃61; PhoneNumberUtils.stripSeparators(dialString);if (basePhone.handleInCallMmiCommands(newDialString)) {return null;} else {throw new CallStateException("cannot dial in current state");}}result &＃61; basePhone.dial(dialString, videoState);return result;
}


basePhone是一个phone对象&＃xff0c;大部分情况是Phone的一个代理类PhoneProxy&＃xff0c;然后根据PhoneProxy的mActivePhone判断具体是那个Phone的子类的实现&＃xff0c;有可能是下面类型&＃xff1a;

com/android/internal/telephony/gsm/GSMPhone.java
com.android.internal.telephony.cdma.CDMAPhone
com.android.internal.telephony.sip.SipPhone
....

private static Phone getPhoneBase(Phone phone) {if (phone instanceof PhoneProxy) {return phone.getForegroundCall().getPhone();}return phone;
}

以GMSPhone#dial为例

GMSPhone#dial

&＃64;Override
public Connectiondial(String dialString, int videoState) throws CallStateException {return dial(dialString, null, videoState, null);}&＃64;Overridepublic Connectiondial (String dialString, UUSInfo uusInfo, int videoState, Bundle intentExtras)throws CallStateException {....return dialInternal(dialString, null, VideoProfile.STATE_AUDIO_ONLY, intentExtras);
}


GMSPhone#dialInternal

&＃64;Overrideprotected ConnectiondialInternal (String dialString, UUSInfo uusInfo, int videoState, Bundle intentExtras)throws CallStateException {// Need to make sure dialString gets parsed properlyString newDialString &＃61; PhoneNumberUtils.stripSeparators(dialString);// handle in-call MMI first if applicableif (handleInCallMmiCommands(newDialString)) {return null;}// Only look at the Network portion for mmiString networkPortion &＃61; PhoneNumberUtils.extractNetworkPortionAlt(newDialString);GsmMmiCode mmi &＃61;GsmMmiCode.newFromDialString(networkPortion, this, mUiccApplication.get());// mCT是GsmCallTracker类对象,这里调用GsmCallTracker#dialif (mmi &＃61;&＃61; null) {return mCT.dial(newDialString, uusInfo, intentExtras);} else if (mmi.isTemporaryModeCLIR()) {return mCT.dial(mmi.mDialingNumber, mmi.getCLIRMode(), uusInfo, intentExtras);} else {mPendingMMIs.add(mmi);mMmiRegistrants.notifyRegistrants(new AsyncResult(null, mmi, null));mmi.processCode();return null;}}


GsmCallTracker#dial

synchronized Connectiondial (String dialString, int clirMode, UUSInfo uusInfo, Bundle intentExtras)throws CallStateException {....if ( mPendingMO.getAddress() &＃61;&＃61; null || mPendingMO.getAddress().length() &＃61;&＃61; 0|| mPendingMO.getAddress().indexOf(PhoneNumberUtils.WILD) >&＃61; 0) {// 无效的号码pollCallsWhenSafe();} else {// Always unmute when initiating a new callsetMute(false);// mCi是CommandsInterface接口&＃xff0c;其具体的实现类是com.android.internal.telephony.RILmCi.dial(mPendingMO.getAddress(), clirMode, uusInfo, obtainCompleteMessage());}....}


关于mCi的初始化工作&＃xff0c;可以参考上一篇短信的发送流程

RIL#dial

public voiddial(String address, int clirMode, UUSInfo uusInfo, Message result) {RILRequest rr &＃61; RILRequest.obtain(RIL_REQUEST_DIAL, result);rr.mParcel.writeString(address);rr.mParcel.writeInt(clirMode);if (uusInfo &＃61;&＃61; null) {rr.mParcel.writeInt(0); // UUS information is absent} else {rr.mParcel.writeInt(1); // UUS information is presentrr.mParcel.writeInt(uusInfo.getType());rr.mParcel.writeInt(uusInfo.getDcs());rr.mParcel.writeByteArray(uusInfo.getUserData());}if (RILJ_LOGD) riljLog(rr.serialString() &＃43; "> " &＃43; requestToString(rr.mRequest));send(rr);}


可以看到&＃xff0c;最终也是通过send方法发送”EVENT_SEND”消息&＃xff0c;给到自己处理&＃xff0c;厉害了&＃xff0c;天啦鲁&＃xff0c;居然和短信的发送走到同一条路上&＃xff0c;然后就是交给modem去具体操作了。

流程总结

1. com.android.dialer.dialpad.DialpadFragment#onClick
2. com.android.dialer.dialpad.DialpadFragment#handleDialButtonPressed
3. com.android.phone.OutgoingCallBroadcaster#processIntent
4. com.android.phone.CallController#placeCall
5. com.android.phone.CallController#placeCallInternal
6. com.android.phone.PhoneUtils#placeCall(android.content.Context, com.android.internal.telephony.Phone, java.lang.String, android.net.Uri, boolean, com.android.phone.CallGatewayManager.RawGatewayInfo, com.android.phone.CallGatewayManager)
7. com.android.internal.telephony.CallManager#dial(com.android.internal.telephony.Phone, java.lang.String, int)
8. com.android.internal.telephony.PhoneProxy#dial(java.lang.String, int)
9. 以GSMPhone为例com.android.internal.telephony.gsm.GSMPhone#dialInternal
10.com.android.internal.telephony.RIL#dial(java.lang.String, int, com.android.internal.telephony.UUSInfo, android.os.Message)
11.com.android.internal.telephony.RIL#send
发送msg &＃61; mSender.obtainMessage(EVENT_SEND, rr);这样的message给到RILSender处理