Android7.0 Phone應用源碼分析（四） phone掛斷流程分析
技術
2017-03-25
今天我們再來分析一下電話掛斷流程
電話掛斷分為本地掛斷和遠程掛斷，針對這兩種情況各做分析
先來看下本地掛斷電話的時序圖：
步驟1：點擊通話界面的掛斷按鈕，會調用到CallCardPresenter的endCallClicked方法，請看CallCardFragment裡掛斷按鈕的監聽事件
com.android.incallui.CallCardFragment
public void onViewCreated(View view, Bundle savedInstanceState) {
...... ......
mFloatingActionButton.setOnClickListener(new View.OnClickListener {
@Override
public void onClick(View v) {
getPresenter.endCallClicked;
}
});
}com.android.incallui.CallCardPresenter
public void endCallClicked {
if (mPrimary == null) {
return;
}
Log.i(this, "Disconnecting call: " + mPrimary);
final String callId = mPrimary.getId;
mPrimary.setState(Call.State.DISCONNECTING);
CallList.getInstance.onUpdate(mPrimary);
TelecomAdapter.getInstance.disconnectCall(callId);
}這裡先把Call的狀態設置成DISCONNECTING，然後通過CallList更新UI界面，最後繼續掛斷流程
步驟2：TelecomAdapter的disconnectCall流程
com.android.incallui.TelecomAdapter
void disconnectCall(String callId) {
android.telecom.Call call = getTelecomCallById(callId);
if (call != null) {
call.disconnect;
} else {
Log.e(this, "error disconnectCall, call not in call list " + callId);
}
}通過callid找到對應的Call對象（android.telecom.Call）
步驟3：調用到framework裡Call的disconnect方法
android.telecom.Call
public void disconnect {
mInCallAdapter.disconnectCall(mTelecomCallId);
}這裡mInCallAdapter是android.telecom.InCallAdapter類，與telecom進程通信的代理類
步驟4：InCallAdapter的disconnectCall方法
android.telecom.InCallAdapter
public void disconnectCall(String callId) {
try {
mAdapter.disconnectCall(callId);
} catch (RemoteException e) {
}
}mAdapter就是incallui與telecom通信的AIDL接口
步驟5：跨進程調用進入telecom進程，該AIDL接口具體實現類是InCallAdapter，相同的類名不一樣的包名
com.android.server.telecom.InCallAdapter
public void disconnectCall(String callId) {
try {
Log.startSession("ICA.dC", mOwnerComponentName);
long token = Binder.clearCallingIdentity;
try {
synchronized (mLock) {
Log.v(this, "disconnectCall: %s", callId);
Call call = mCallIdMapper.getCall(callId);
if (call != null) {
mCallsManager.disconnectCall(call);
} else {
Log.w(this, "disconnectCall, unknown call id: %s", callId);
}
}
} finally {
Binder.restoreCallingIdentity(token);
}
} finally {
Log.endSession;
}
}這裡同樣是根據callid取出對應Call（com.android.server.telecom.Call),最後調用CallsManager的disconnectCall方法傳入call
步驟6：CallsManager的disconnectCall方法
com.android.server.telecom.CallsManager
public void disconnectCall(Call call) {
Log.v(this, "disconnectCall %s", call);
if (!mCalls.contains(call)) {
Log.w(this, "Unknown call (%s) asked to disconnect", call);
} else {
mLocallyDisconnectingCalls.add(call);
call.disconnect;
}
}將該Call對象加入本地斷開Call列表，之後進入Call的disconnect方法
步驟7：Call的disconnect方法
com.android.server.telecom.Call
public void disconnect {
disconnect(false);
}public void disconnect(boolean wasViaNewOutgoingCallBroadcaster) {
Log.event(this, Log.Events.REQUEST_DISCONNECT);
// Track that the call is now locally disconnecting.
setLocallyDisconnecting(true);
if (mState == CallState.NEW || mState == CallState.SELECT_PHONE_ACCOUNT ||
mState == CallState.CONNECTING) {
Log.v(this, "Aborting call %s", this);
abort(wasViaNewOutgoingCallBroadcaster);
} else if (mState != CallState.ABORTED && mState != CallState.DISCONNECTED) {
if (mConnectionService == null) {
Log.e(this, new Exception, "disconnect request on a call without a"
+ " connection service.");
} else {
Log.i(this, "Send disconnect to connection service for call: %s", this);
// The call isn't officially disconnected until the connection service
// confirms that the call was actually disconnected. Only then is the
// association between call and connection service severed, see
// {@link CallsManager#markCallAsDisconnected}.
mConnectionService.disconnect(this);
}
}
}setLocallyDisconnecting(true); 先設置是否為本地掛斷標誌為true
由於mState這時候是CallState.ACTIVE狀態，進入mConnectionService的disconnect方法
這裡的mConnectionService是ConnectionServiceWrapper類，是telecom與telephony通信的代理類
步驟8：ConnectionServiceWrapper的disconnect方法
com.android.server.telecom.ConnectionServiceWrapper
void disconnect(Call call) {
final String callId = mCallIdMapper.getCallId(call);
if (callId != null && isServiceValid("disconnect")) {
try {
logOutgoing("disconnect %s", callId);
mServiceInterface.disconnect(callId);
} catch (RemoteException e) {
}
}
}這裡mServiceInterface就是telephony提供給telecom調用的AIDL接口
步驟9：跨進程調用進入telephony進程，AIDL接口具體實現是其父類ConnectionService的mBinder成員變量
android.telecom.ConnectionService
private final IBinder mBinder = new IConnectionService.Stub {
......
......
public void disconnect(String callId) {
mHandler.obtainMessage(MSG_DISCONNECT, callId).sendToTarget;
}
}步驟10~13：發送MSG_DISCONNECT消息到隊列裡處理
private void disconnect(String callId) {
Log.d(this, "disconnect %s", callId);
if (mConnectionById.containsKey(callId)) {
findConnectionForAction(callId, "disconnect").onDisconnect;
} else {
findConferenceForAction(callId, "disconnect").onDisconnect;
}
}private Connection findConnectionForAction(String callId, String action) {
if (mConnectionById.containsKey(callId)) {
return mConnectionById.get(callId);
}
Log.w(this, "%s - Cannot find Connection %s", action, callId);
return getNullConnection;
}根據callid找到對應的connection對象（android.telecom.Connection），調用onDisconnect方法
步驟14，15：TelephonyConnection繼承於connection
com.android.services.telephony.TelephonyConnection
public void onDisconnect {
Log.v(this, "onDisconnect");
hangup(android.telephony.DisconnectCause.LOCAL);
}protected void hangup(int telephonyDisconnectCode) {
if (mOriginalConnection != null) {
try {
// Hanging up a ringing call requires that we invoke call.hangup as opposed to
// connection.hangup. Without this change, the party originating the call will not
// get sent to voicemail if the user opts to reject the call.
if (isValidRingingCall) {
Call call = getCall;
if (call != null) {
call.hangup;
} else {
Log.w(this, "Attempting to hangup a connection without backing call.");
}
} else {
// We still prefer to call connection.hangup for non-ringing calls in order
// to support hanging-up specific calls within a conference call. If we invoked
// call.hangup while in a conference, we would end up hanging up the entire
// conference call instead of the specific connection.
mOriginalConnection.hangup;
}
} catch (CallStateException e) {
Log.e(this, e, "Call to Connection.hangup failed with exception");
}
}
}設置斷開連接類型為DisconnectCause.LOCAL，並調用mOriginalConnection的hangup方法, 實際Connection類是GsmCdmaConnection
步驟16：GsmCdmaConnection的hangup方法
com.android.internal.telephony.GsmCdmaConnection
public void hangup throws CallStateException {
if (!mDisconnected) {
mOwner.hangup(this);
} else {
throw new CallStateException ("disconnected");
}
}這裡的mOwner對想是GsmCdmaCallTracker類型
步驟17：GsmCdmaCallTracker的hangup方法
com.android.internal.telephony.GsmCdmaCallTracker
public void hangup(GsmCdmaConnection conn) throws CallStateException {
if (conn.mOwner != this) {
throw new CallStateException ("GsmCdmaConnection " + conn
+ "does not belong to GsmCdmaCallTracker " + this);
}
if (conn == mPendingMO) {
// We're hanging up an outgoing call that doesn't have it's
// GsmCdma index assigned yet
if (Phone.DEBUG_PHONE) log("hangup: set hangupPendingMO to true");
mHangupPendingMO = true;
} else if (!isPhoneTypeGsm
&& conn.getCall == mRingingCall
&& mRingingCall.getState == GsmCdmaCall.State.WAITING) {
// Handle call waiting hang up case.
//
// The ringingCall state will change to IDLE in GsmCdmaCall.detach
// if the ringing call connection size is 0. We don't specifically
// set the ringing call state to IDLE here to avoid a race condition
// where a new call waiting could get a hang up from an old call
// waiting ringingCall.
//
// PhoneApp does the call log itself since only PhoneApp knows
// the hangup reason is user ignoring or timing out. So conn.onDisconnect
// is not called here. Instead, conn.onLocalDisconnect is called.
conn.onLocalDisconnect;
updatePhoneState;
mPhone.notifyPreciseCallStateChanged;
return;
} else {
try {
mCi.hangupConnection (conn.getGsmCdmaIndex, obtainCompleteMessage);
} catch (CallStateException ex) {
// Ignore "connection not found"
// Call may have hung up already
Rlog.w(LOG_TAG,"GsmCdmaCallTracker WARN: hangup on absent connection "
+ conn);
}
}
conn.onHangupLocal;
}由於是通話中掛斷，這裡調用 mCi.hangupConnection (conn.getGsmCdmaIndex, obtainCompleteMessage);
這裡調用conn的getGsmCdmaIndex方法先獲取索引
com.android.internal.telephony.GsmCdmaConnection
getGsmCdmaIndex throws CallStateException {
if (mIndex >= 0) {
return mIndex + 1;
} else {
throw new CallStateException ("GsmCdma index not yet assigned");
}
}這個索引對應的就是DriveCall裡的index值，匹配modem裡CallList裡對於Call對象
mCi是CommandsInterface即RILJ接口，包裝了一個EVENT_OPERATION_COMPLETE回調消息，發送給RIL
步驟18：RIL的hangupConnection方法
com.android.internal.telephony.RIL
public void hangupConnection (int gsmIndex, Message result) {
if (RILJ_LOGD) riljLog("hangupConnection: gsmIndex=" + gsmIndex);
RILRequest rr = RILRequest.obtain(RIL_REQUEST_HANGUP, result);
if (RILJ_LOGD) riljLog(rr.serialString + "> " + requestToString(rr.mRequest) + " " +
gsmIndex);
mEventLog.writeRilHangup(rr.mSerial, RIL_REQUEST_HANGUP, gsmIndex);
rr.mParcel.writeInt(1);
rr.mParcel.writeInt(gsmIndex);
send(rr);
}給RIL層發送RIL_REQUEST_HANGUP消息並附帶index參數
步驟19~23：收到RIL層的迴應消息並處理，最後發送回調消息EVENT_OPERATION_COMPLETE給GsmCdmaCallTracker
步驟24：GsmCdmaCallTracker處理回調消息EVENT_OPERATION_COMPLETE
com.android.internal.telephony.GsmCdmaCallTracker
private void operationComplete {
mPendingOperations--;
if (DBG_POLL) log("operationComplete: pendingOperations=" +
mPendingOperations + ", needsPoll=" + mNeedsPoll);
if (mPendingOperations == 0 && mNeedsPoll) {
mLastRelevantPoll = obtainMessage(EVENT_POLL_CALLS_RESULT);
mCi.getCurrentCalls(mLastRelevantPoll);
} else if (mPendingOperations < 0) {
// this should never happen
Rlog.e(LOG_TAG,"GsmCdmaCallTracker.pendingOperations < 0");
mPendingOperations = 0;
}
}這裡再次向RIL發送消息主動獲取當前Call狀態，包裝的回調消息為EVENT_POLL_CALLS_RESULT
步驟25~31：RIL返回消息，GsmCdmaCallTracker接收EVENT_POLL_CALLS_RESULT消息並處理
com.android.internal.telephony.GsmCdmaCallTracker
protected synchronized void handlePollCalls(AsyncResult ar) {
List polledCalls;
if (VDBG) log("handlePollCalls");
if (ar.exception == null) {
polledCalls = (List)ar.result;
} else if (isCommandExceptionRadioNotAvailable(ar.exception)) {
// just a dummy empty ArrayList to cause the loop
// to hang up all the calls
polledCalls = new ArrayList;
} else {
// Radio probably wasn't ready--try again in a bit
// But don't keep polling if the channel is closed
pollCallsAfterDelay;
return;
}
…………for (int i = 0, curDC = 0, dcSize = polledCalls.size
; i < mConnections.length; i++) {
GsmCdmaConnection conn = mConnections[i];
DriverCall dc = null;
// polledCall list is sparse
if (curDC < dcSize) {
dc = (DriverCall) polledCalls.get(curDC);
if (dc.index == i+1) {
curDC++;
} else {
dc = null;
}
}
…………
} else if (conn != null && dc == null) {
if (isPhoneTypeGsm) {
// Connection missing in CLCC response that we were
// tracking.
mDroppedDuringPoll.add(conn);
// Dropped connections are removed from the CallTracker
// list but kept in the GsmCdmaCall list
mConnections[i] = null;
} else {
…………
for (int i = mDroppedDuringPoll.size - 1; i >= 0 ; i--) {
GsmCdmaConnection conn = mDroppedDuringPoll.get(i);
//CDMA
boolean wasDisconnected = false;
if (conn.isIncoming && conn.getConnectTime == 0) {
// Missed or rejected call
int cause;
if (conn.mCause == DisconnectCause.LOCAL) {
cause = DisconnectCause.INCOMING_REJECTED;
} else {
cause = DisconnectCause.INCOMING_MISSED;
}
if (Phone.DEBUG_PHONE) {
log("missed/rejected call, conn.cause=" + conn.mCause);
log("setting cause to " + cause);
}
mDroppedDuringPoll.remove(i);
hasAnyCallDisconnected |= conn.onDisconnect(cause);
wasDisconnected = true;
} else if (conn.mCause == DisconnectCause.LOCAL
|| conn.mCause == DisconnectCause.INVALID_NUMBER) {
mDroppedDuringPoll.remove(i);
hasAnyCallDisconnected |= conn.onDisconnect(conn.mCause);
wasDisconnected = true;
}
if (!isPhoneTypeGsm && wasDisconnected && unknownConnectionAppeared
&& conn == newUnknownConnectionCdma) {
unknownConnectionAppeared = false;
newUnknownConnectionCdma = null;
}
}
/* Disconnect any pending Handover connections */
for (Iterator<Connection> it = mHandoverConnections.iterator;
it.hasNext;) {
Connection hoConnection = it.next;
log("handlePollCalls - disconnect hoConn= " + hoConnection +
" hoConn.State= " + hoConnection.getState);
if (hoConnection.getState.isRinging) {
hoConnection.onDisconnect(DisconnectCause.INCOMING_MISSED);
} else {
hoConnection.onDisconnect(DisconnectCause.NOT_VALID);
}
it.remove;
}
// Any non-local disconnects: determine cause
if (mDroppedDuringPoll.size > 0) {
mCi.getLastCallFailCause(
obtainNoPollCompleteMessage(EVENT_GET_LAST_CALL_FAIL_CAUSE));
}
…………
if (VDBG) log("handlePollCalls calling updatePhoneState");
updatePhoneState;
if (unknownConnectionAppeared) {
if (isPhoneTypeGsm) {
for (Connection c : newUnknownConnectionsGsm) {
log("Notify unknown for " + c);
mPhone.notifyUnknownConnection(c);
}
} else {
mPhone.notifyUnknownConnection(newUnknownConnectionCdma);
}
}
if (hasNonHangupStateChanged || newRinging != null || hasAnyCallDisconnected) {
mPhone.notifyPreciseCallStateChanged;
}
//dumpState;
}
}這裡是通話斷開事件，將connection放入mDroppedDuringPoll列表，由於斷開類型是DisconnectCause.LOCAL
直接調用GsmCdmaConnection的onDisconnect方法傳入cause參數
步驟32：GsmCdmaConnection的onDisconnect方法
com.android.internal.telephony.GsmCdmaConnection
public boolean onDisconnect(int cause) {
boolean changed = false;
mCause = cause;
if (!mDisconnected) {
doDisconnect;
if (DBG) Rlog.d(LOG_TAG, "onDisconnect: cause=" + cause);
mOwner.getPhone.notifyDisconnect(this);
if (mParent != null) {
changed = mParent.connectionDisconnected(this);
}
mOrigConnection = null;
}
clearPostDialListeners;
releaseWakeLock;
return changed;
}doDisconnect方法設置斷開時間以及通話時長
private void doDisconnect {
mIndex = -1;
mDisconnectTime = System.currentTimeMillis;
mDuration = SystemClock.elapsedRealtime - mConnectTimeReal;
mDisconnected = true;
clearPostDialListeners;
}最後通知註冊者斷開事件mOwner.getPhone.notifyDisconnect(this);
步驟33之後的流程就跟上篇講解phone拒接流程一樣，這裡就不重複描述了
講完本地掛斷電話的流程，再講一下遠程掛斷的流程，先看一下相關的時序圖
步驟1~4：modem層上報RIL_UNSOL_RESPONSE_CALL_STATE_CHANGED事件，RIL通知EVENT_CALL_STATE_CHANGE消息
步驟5，6，7：GsmCdmaCallTracker處理消息，向RIL發送消息主動獲取當前Call狀態，包裝的回調消息為EVENT_POLL_CALLS_RESULT
com.android.internal.telephony.CallTracker
protected void pollCallsWhenSafe {
mNeedsPoll = true;
if (checkNoOperationsPending) {
mLastRelevantPoll = obtainMessage(EVENT_POLL_CALLS_RESULT);
mCi.getCurrentCalls(mLastRelevantPoll);
}
}步驟8~13：RIL返回消息，GsmCdmaCallTracker接收EVENT_POLL_CALLS_RESULT消息並處理
com.android.internal.telephony.GsmCdmaCallTracker
protected synchronized void handlePollCalls(AsyncResult ar) {
List polledCalls;
…………if (mDroppedDuringPoll.size > 0) {
mCi.getLastCallFailCause(
obtainNoPollCompleteMessage(EVENT_GET_LAST_CALL_FAIL_CAUSE));
}
…………}
這裡跟前面本地掛斷的流程差不多，但區別是由於不是本地掛斷的cause類型，會主動再向RIL發送消息獲取通話斷開的cause
包裝的回調消息為EVENT_GET_LAST_CALL_FAIL_CAUSE
步驟14：RIL的getLastCallFailCause方法
com.android.internal.telephony.RIL
public void getLastCallFailCause (Message result) {
RILRequest rr
= RILRequest.obtain(RIL_REQUEST_LAST_CALL_FAIL_CAUSE, result);
if (RILJ_LOGD) riljLog(rr.serialString + "> " + requestToString(rr.mRequest));
send(rr);
}向MODEM發送RIL_REQUEST_LAST_CALL_FAIL_CAUSE消息
步驟15~20：modem迴應RIL_REQUEST_LAST_CALL_FAIL_CAUSE消息，RIL發送回調消息EVENT_GET_LAST_CALL_FAIL_CAUSE
步驟21：GsmCdmaCallTracker處理消息
com.android.internal.telephony.GsmCdmaCallTracker
case EVENT_GET_LAST_CALL_FAIL_CAUSE:
int causeCode;
String vendorCause = null;
ar = (AsyncResult)msg.obj;
operationComplete;
if (ar.exception != null) {
// An exception occurred...just treat the disconnect
// cause as "normal"
causeCode = CallFailCause.NORMAL_CLEARING;
Rlog.i(LOG_TAG,
"Exception during getLastCallFailCause, assuming normal disconnect");
} else {
LastCallFailCause failCause = (LastCallFailCause)ar.result;
causeCode = failCause.causeCode;
vendorCause = failCause.vendorCause;
}
// Log the causeCode if its not normal
if (causeCode == CallFailCause.NO_CIRCUIT_AVAIL ||
causeCode == CallFailCause.TEMPORARY_FAILURE ||
causeCode == CallFailCause.SWITCHING_CONGESTION ||
causeCode == CallFailCause.CHANNEL_NOT_AVAIL ||
causeCode == CallFailCause.QOS_NOT_AVAIL ||
causeCode == CallFailCause.BEARER_NOT_AVAIL ||
causeCode == CallFailCause.ERROR_UNSPECIFIED) {
CellLocation loc = mPhone.getCellLocation;
int cid = -1;
if (loc != null) {
if (isPhoneTypeGsm) {
cid = ((GsmCellLocation)loc).getCid;
} else {
cid = ((CdmaCellLocation)loc).getBaseStationId;
}
}
EventLog.writeEvent(EventLogTags.CALL_DROP, causeCode, cid,
TelephonyManager.getDefault.getNetworkType);
}
for (int i = 0, s = mDroppedDuringPoll.size; i < s ; i++) {
GsmCdmaConnection conn = mDroppedDuringPoll.get(i);
conn.onRemoteDisconnect(causeCode, vendorCause);
}
updatePhoneState;
mPhone.notifyPreciseCallStateChanged;
mDroppedDuringPoll.clear;
break;RIL在處理RIL_REQUEST_LAST_CALL_FAIL_CAUSE消息時將結果放入LastCallFailCause對象，傳遞給GsmCdmaCallTracker
GsmCdmaCallTracker得到結果，其中causeCode值就是斷開原因，接著調用GsmCdmaConnection的onRemoteDisconnect方法
步驟22：GsmCdmaConnection的onRemoteDisconnect方法
com.android.internal.telephony.GsmCdmaConnection
void onRemoteDisconnect(int causeCode, String vendorCause) {
this.mPreciseCause = causeCode;
this.mVendorCause = vendorCause;
onDisconnect(disconnectCauseFromCode(causeCode));
}這裡通過disconnectCauseFromCode方法將causeCode值轉化為DisconnectCause值
int disconnectCauseFromCode(int causeCode) {
/**
* See 22.001 Annex F.4 for mapping of cause codes
* to local tones
*/
switch (causeCode) {
case CallFailCause.USER_BUSY:
return DisconnectCause.BUSY;
case CallFailCause.NO_CIRCUIT_AVAIL:
case CallFailCause.TEMPORARY_FAILURE:
case CallFailCause.SWITCHING_CONGESTION:
case CallFailCause.CHANNEL_NOT_AVAIL:
case CallFailCause.QOS_NOT_AVAIL:
case CallFailCause.BEARER_NOT_AVAIL:
return DisconnectCause.CONGESTION;
case CallFailCause.ACM_LIMIT_EXCEEDED:
return DisconnectCause.LIMIT_EXCEEDED;
case CallFailCause.CALL_BARRED:
return DisconnectCause.CALL_BARRED;
case CallFailCause.FDN_BLOCKED:
return DisconnectCause.FDN_BLOCKED;
case CallFailCause.UNOBTAINABLE_NUMBER:
return DisconnectCause.UNOBTAINABLE_NUMBER;
case CallFailCause.DIAL_MODIFIED_TO_USSD:
return DisconnectCause.DIAL_MODIFIED_TO_USSD;
case CallFailCause.DIAL_MODIFIED_TO_SS:
return DisconnectCause.DIAL_MODIFIED_TO_SS;
case CallFailCause.DIAL_MODIFIED_TO_DIAL:
return DisconnectCause.DIAL_MODIFIED_TO_DIAL;
case CallFailCause.CDMA_LOCKED_UNTIL_POWER_CYCLE:
return DisconnectCause.CDMA_LOCKED_UNTIL_POWER_CYCLE;
case CallFailCause.CDMA_DROP:
return DisconnectCause.CDMA_DROP;
case CallFailCause.CDMA_INTERCEPT:
return DisconnectCause.CDMA_INTERCEPT;
case CallFailCause.CDMA_REORDER:
return DisconnectCause.CDMA_REORDER;
case CallFailCause.CDMA_SO_REJECT:
return DisconnectCause.CDMA_SO_REJECT;
case CallFailCause.CDMA_RETRY_ORDER:
return DisconnectCause.CDMA_RETRY_ORDER;
case CallFailCause.CDMA_ACCESS_FAILURE:
return DisconnectCause.CDMA_ACCESS_FAILURE;
case CallFailCause.CDMA_PREEMPTED:
return DisconnectCause.CDMA_PREEMPTED;
case CallFailCause.CDMA_NOT_EMERGENCY:
return DisconnectCause.CDMA_NOT_EMERGENCY;
case CallFailCause.CDMA_ACCESS_BLOCKED:
return DisconnectCause.CDMA_ACCESS_BLOCKED;
case CallFailCause.ERROR_UNSPECIFIED:
case CallFailCause.NORMAL_CLEARING:
default:
GsmCdmaPhone phone = mOwner.getPhone;
int serviceState = phone.getServiceState.getState;
UiccCardApplication cardApp = phone.getUiccCardApplication;
AppState uiccAppState = (cardApp != null) ? cardApp.getState :
AppState.APPSTATE_UNKNOWN;
if (serviceState == ServiceState.STATE_POWER_OFF) {
return DisconnectCause.POWER_OFF;
} else if (serviceState == ServiceState.STATE_OUT_OF_SERVICE
|| serviceState == ServiceState.STATE_EMERGENCY_ONLY ) {
return DisconnectCause.OUT_OF_SERVICE;
} else {
if (isPhoneTypeGsm) {
if (uiccAppState != AppState.APPSTATE_READY) {
return DisconnectCause.ICC_ERROR;
} else if (causeCode == CallFailCause.ERROR_UNSPECIFIED) {
if (phone.mSST.mRestrictedState.isCsRestricted) {
return DisconnectCause.CS_RESTRICTED;
} else if (phone.mSST.mRestrictedState.isCsEmergencyRestricted) {
return DisconnectCause.CS_RESTRICTED_EMERGENCY;
} else if (phone.mSST.mRestrictedState.isCsNormalRestricted) {
return DisconnectCause.CS_RESTRICTED_NORMAL;
} else {
return DisconnectCause.ERROR_UNSPECIFIED;
}
} else if (causeCode == CallFailCause.NORMAL_CLEARING) {
return DisconnectCause.NORMAL;
} else {
// If nothing else matches, report unknown call drop reason
// to app, not NORMAL call end.
return DisconnectCause.ERROR_UNSPECIFIED;
}
} else {
if (phone.mCdmaSubscriptionSource ==
CdmaSubscriptionSourceManager.SUBSCRIPTION_FROM_RUIM
&& uiccAppState != AppState.APPSTATE_READY) {
return DisconnectCause.ICC_ERROR;
} else if (causeCode==CallFailCause.NORMAL_CLEARING) {
return DisconnectCause.NORMAL;
} else {
return DisconnectCause.ERROR_UNSPECIFIED;
}
}
}
}
}由於causeCode值是NORMAL_CLEARING，所以得到的DisconnectCause值是DisconnectCause.NORMAL
接著調用onDisconnect方法
public boolean onDisconnect(int cause) {
boolean changed = false;
mCause = cause;
if (!mDisconnected) {
doDisconnect;
if (DBG) Rlog.d(LOG_TAG, "onDisconnect: cause=" + cause);
mOwner.getPhone.notifyDisconnect(this);
if (mParent != null) {
changed = mParent.connectionDisconnected(this);
}
mOrigConnection = null;
}
clearPostDialListeners;
releaseWakeLock;
return changed;
}步驟23之後的流程就跟上篇講解phone拒接流程一樣，這裡就不重複描述了
至此，一個電話掛斷的流程就分析完了，結合log打印會對整個流程的理解更加深刻