接上篇博文：Android7.0 Phone应用源码分析（三） phone拒接流程分析
今天我们再来分析一下电话挂断流程
电话挂断分为本地挂断和远程挂断，针对这两种情况各做分析
先来看下本地挂断电话的时序图：
步骤1：点击通话界面的挂断按钮，会调用到CallCardPresenter的endCallClicked方法，请看CallCardFragment里挂断按钮的监听事件
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);
}
这里先把Call的状态设置成DISCONNECTING，然后通过CallList更新UI界面，最后继续挂断流程
步骤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);
}
}
通过callid找到对应的Call对象（android.telecom.Call）
步骤3：调用到framework里Call的disconnect方法
android.telecom.Call
public void disconnect() {
mInCallAdapter.disconnectCall(mTelecomCallId);
}
这里mInCallAdapter是android.telecom.InCallAdapter类，与telecom进程通信的代理类
步骤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与telecom通信的AIDL接口
步骤5：跨进程调用进入telecom进程，该AIDL接口具体实现类是InCallAdapter，相同的类名不一样的包名
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();
}
}
这里同样是根据callid取出对应Call（com.android.server.telecom.Call),最后调用CallsManager的disconnectCall方法传入call
步骤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();
}
}
将该Call对象加入本地断开Call列表，之后进入Call的disconnect方法
步骤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); 先设置是否为本地挂断标志为true
由于mState这时候是CallState.ACTIVE状态，进入mConnectionService的disconnect方法
这里的mConnectionService是ConnectionServiceWrapper类，是telecom与telephony通信的代理类
步骤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) {
}
}
}
这里mServiceInterface就是telephony提供给telecom调用的AIDL接口
步骤9：跨进程调用进入telephony进程，AIDL接口具体实现是其父类ConnectionService的mBinder成员变量
android.telecom.ConnectionService
private final IBinder mBinder = new IConnectionService.Stub() {
......
......
public void disconnect(String callId) {
mHandler.obtainMessage(MSG_DISCONNECT, callId).sendToTarget();
}
}步骤10~13：发送MSG_DISCONNECT消息到队列里处理
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();
}根据callid找到对应的connection对象（android.telecom.Connection），调用onDisconnect方法
步骤14，15：TelephonyConnection继承于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");
}
}
}设置断开连接类型为DisconnectCause.LOCAL，并调用mOriginalConnection的hangup方法, 实际Connection类是GsmCdmaConnection
步骤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");
}
}
这里的mOwner对想是GsmCdmaCallTracker类型
步骤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();
}
由于是通话中挂断，这里调用 mCi.hangupConnection (conn.getGsmCdmaIndex(), obtainCompleteMessage());
这里调用conn的getGsmCdmaIndex方法先获取索引
com.android.internal.telephony.GsmCdmaConnection
getGsmCdmaIndex() throws CallStateException {
if (mIndex >= 0) {
return mIndex + 1;
} else {
throw new CallStateException ("GsmCdma index not yet assigned");
}
}
这个索引对应的就是DriveCall里的index值，匹配modem里CallList里对于Call对象
mCi是CommandsInterface即RILJ接口，包装了一个EVENT_OPERATION_COMPLETE回调消息，发送给RIL
步骤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);
}
给RIL层发送RIL_REQUEST_HANGUP消息并附带index参数
步骤19~23：收到RIL层的回应消息并处理，最后发送回调消息EVENT_OPERATION_COMPLETE给GsmCdmaCallTracker
步骤24：GsmCdmaCallTracker处理回调消息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;
}
}
这里再次向RIL发送消息主动获取当前Call状态，包装的回调消息为EVENT_POLL_CALLS_RESULT
步骤25~31：RIL返回消息，GsmCdmaCallTracker接收EVENT_POLL_CALLS_RESULT消息并处理
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();
}
}
这里是通话断开事件，将connection放入mDroppedDuringPoll列表，由于断开类型是DisconnectCause.LOCAL
直接调用GsmCdmaConnection的onDisconnect方法传入cause参数
步骤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方法设置断开时间以及通话时长
private void doDisconnect() {
mIndex = -1;
mDisconnectTime = System.currentTimeMillis();
mDuration = SystemClock.elapsedRealtime() - mConnectTimeReal;
mDisconnected = true;
clearPostDialListeners();
}最后通知注册者断开事件mOwner.getPhone().notifyDisconnect(this);
步骤33之后的流程就跟上篇讲解phone拒接流程一样，这里就不重复描述了
详见http://www.cnblogs.com/lance2016/p/6391096.html
讲完本地挂断电话的流程，再讲一下远程挂断的流程，先看一下相关的时序图
步骤1~4：modem层上报RIL_UNSOL_RESPONSE_CALL_STATE_CHANGED事件，RIL通知EVENT_CALL_STATE_CHANGE消息
步骤5，6，7：GsmCdmaCallTracker处理消息，向RIL发送消息主动获取当前Call状态，包装的回调消息为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);
}
}
步骤8~13：RIL返回消息，GsmCdmaCallTracker接收EVENT_POLL_CALLS_RESULT消息并处理
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));
}
…………}
这里跟前面本地挂断的流程差不多，但区别是由于不是本地挂断的cause类型，会主动再向RIL发送消息获取通话断开的cause
包装的回调消息为EVENT_GET_LAST_CALL_FAIL_CAUSE
步骤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发送RIL_REQUEST_LAST_CALL_FAIL_CAUSE消息
步骤15~20：modem回应RIL_REQUEST_LAST_CALL_FAIL_CAUSE消息，RIL发送回调消息EVENT_GET_LAST_CALL_FAIL_CAUSE
步骤21：GsmCdmaCallTracker处理消息
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在处理RIL_REQUEST_LAST_CALL_FAIL_CAUSE消息时将结果放入LastCallFailCause对象，传递给GsmCdmaCallTracker
GsmCdmaCallTracker得到结果，其中causeCode值就是断开原因，接着调用GsmCdmaConnection的onRemoteDisconnect方法
步骤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));
}
这里通过disconnectCauseFromCode方法将causeCode值转化为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;
}
}
}
}
}由于causeCode值是NORMAL_CLEARING，所以得到的DisconnectCause值是DisconnectCause.NORMAL
接着调用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;
}步骤23之后的流程就跟上篇讲解phone拒接流程一样，这里就不重复描述了
详见http://www.cnblogs.com/lance2016/p/6391096.html
至此，一个电话挂断的流程就分析完了，结合log打印会对整个流程的理解更加深刻