在开机时,系统会启动PhoneApp类,那是因为在AndroidManifest.xml文件中配置了
<application android:name="PhoneApp" android:icon="@drawable/ic_launcher_phone" android:label="@string/phoneAppLabel" android:persistent="true" > </application>
由于配置了android:persistent="true"属性,并且Phone.apk是安装在/system/app/目录下的,所以在开机时会自动启动PhoneApp类。在PhoneApp初始化时会进入回调函数:onCreate()
@Override public void onCreate() { //....... if (phone == null) { //........ // 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, phone, ringer, mBtHandsfree, new CallLogAsync()); //........ } }
对CallNotifier对象进行初始化,Callnotifier主要是对电话状态的监听
在CallNotifier的构造函数里
private CallNotifier(PhoneApp app, Phone phone, Ringer ringer, BluetoothHandsfree btMgr, CallLogAsync callLog) { //............ //跟CallManager注册通知,跟Framework通訊 registerForNotifications(); //............... }
在CallNotifier.java中向CallManager类(Framework层)注册监听消息
private void registerForNotifications() { mCM.registerForNewRingingConnection(this, PHONE_NEW_RINGING_CONNECTION, null); mCM.registerForPreciseCallStateChanged(this, PHONE_STATE_CHANGED, null); mCM.registerForDisconnect(this, PHONE_DISCONNECT, null); mCM.registerForUnknownConnection(this, PHONE_UNKNOWN_CONNECTION_APPEARED, null); mCM.registerForIncomingRing(this, PHONE_INCOMING_RING, null); mCM.registerForCdmaOtaStatusChange(this, EVENT_OTA_PROVISION_CHANGE, null); mCM.registerForCallWaiting(this, PHONE_CDMA_CALL_WAITING, null); mCM.registerForDisplayInfo(this, PHONE_STATE_DISPLAYINFO, null); mCM.registerForSignalInfo(this, PHONE_STATE_SIGNALINFO, null); mCM.registerForInCallVoicePrivacyOn(this, PHONE_ENHANCED_VP_ON, null); mCM.registerForInCallVoicePrivacyOff(this, PHONE_ENHANCED_VP_OFF, null); mCM.registerForRingbackTone(this, PHONE_RINGBACK_TONE, null); mCM.registerForResendIncallMute(this, PHONE_RESEND_MUTE, null); }
通过mCM.registerForNewRingingConnection(this,
PHONE_NEW_RINGING_CONNECTION, null);监听来电,在CallManager.java中
/** * Register for getting notifications for change in the Call State {@link Call.State} * This is called PreciseCallState because the call state is more precise than the * {@link Phone.State} which can be obtained using the {@link PhoneStateListener} * * Resulting events will have an AsyncResult in <code>Message.obj</code>. * AsyncResult.userData will be set to the obj argument here. * The <em>h</em> parameter is held only by a weak reference. */ public void registerForPreciseCallStateChanged(Handler h, int what, Object obj){ mPreciseCallStateRegistrants.addUnique(h, what, obj); }
处理PHONE_NEW_RINGING_CONNECTION
<pre name="code" class="java"> @Override public void handleMessage(Message msg) { switch (msg.what) { case PHONE_NEW_RINGING_CONNECTION: log("RINGING... (new)"); onNewRingingConnection((AsyncResult) msg.obj); mSilentRingerRequested = false; break; //........... } }
什么时候会收到PHONE_NEW_RINGING_CONNECTION消息呢?当Modem(调制解调器)端收到来电信息时,会将相关来电信息通过AT指令发送给RILC,再通过RILC使用socket发送给RILJ,逐层向上传递,上传到Framework层,最终显示来电响铃界面。最后是通过以下广播上传到PhoneApp
在RIL中有一个内部类RILReceiver
class RILReceiver implements Runnable { byte[] buffer; RILReceiver() { buffer = new byte[RIL_MAX_COMMAND_BYTES]; } public void run() { int retryCount = 0; try {for (;;) { LocalSocket s = null; LocalSocketAddress l; try { s = new LocalSocket(); l = new LocalSocketAddress(SOCKET_NAME_RIL, LocalSocketAddress.Namespace.RESERVED); s.connect(l); } catch (IOException ex){ try { if (s != null) { s.close(); } } catch (IOException ex2) { //ignore failure to close after failure to connect } // don't print an error message after the the first time // or after the 8th time if (retryCount == 8) { Log.e (LOG_TAG, "Couldn't find '" + SOCKET_NAME_RIL + "' socket after " + retryCount + " times, continuing to retry silently"); } else if (retryCount > 0 && retryCount < 8) { Log.i (LOG_TAG, "Couldn't find '" + SOCKET_NAME_RIL + "' socket; retrying after timeout"); } try { Thread.sleep(SOCKET_OPEN_RETRY_MILLIS); } catch (InterruptedException er) { } retryCount++; continue; } retryCount = 0; mSocket = s; Log.i(LOG_TAG, "Connected to '" + SOCKET_NAME_RIL + "' socket"); int length = 0; try { InputStream is = mSocket.getInputStream(); for (;;) { Parcel p; length = readRilMessage(is, buffer); if (length < 0) { // End-of-stream reached break; } p = Parcel.obtain(); p.unmarshall(buffer, 0, length); p.setDataPosition(0); //Log.v(LOG_TAG, "Read packet: " + length + " bytes"); processResponse(p); p.recycle(); } } catch (java.io.IOException ex) { Log.i(LOG_TAG, "'" + SOCKET_NAME_RIL + "' socket closed", ex); } catch (Throwable tr) { Log.e(LOG_TAG, "Uncaught exception read length=" + length + "Exception:" + tr.toString()); } Log.i(LOG_TAG, "Disconnected from '" + SOCKET_NAME_RIL + "' socket"); setRadioState (RadioState.RADIO_UNAVAILABLE); try { mSocket.close(); } catch (IOException ex) { } mSocket = null; RILRequest.resetSerial(); // Clear request list on close clearRequestsList(RADIO_NOT_AVAILABLE, false); }} catch (Throwable tr) { Log.e(LOG_TAG,"Uncaught exception", tr); } /* We're disconnected so we don't know the ril version */ notifyRegistrantsRilConnectionChanged(-1); } }
在RIL的构造函数中创建RILReceiver对象
public RIL(Context context, int preferredNetworkType, int cdmaSubscription) { //.................. mReceiver = new RILReceiver(); mReceiverThread = new Thread(mReceiver, "RILReceiver"); mReceiverThread.start(); //................. } }
在前面的分析中知道RIL在PhoneApp中就进行初始化了,RILReceiver是一个线程使用Socket通信。在线程中调用processResponse(p)
private void processResponse (Parcel p) { int type; type = p.readInt(); if (type == RESPONSE_UNSOLICITED) { //主动响应 processUnsolicited (p); } else if (type == RESPONSE_SOLICITED) { //响应请求 processSolicited (p); } releaseWakeLockIfDone(); }
来电调用的是以下函数
private void processUnsolicited (Parcel p) { //.............. case RIL_UNSOL_CALL_RING: ret = responseCallRing(p); break; //.............. case RIL_UNSOL_CALL_RING: if (RILJ_LOGD) unsljLogRet(response, ret); if (mRingRegistrant != null) { mRingRegistrant.notifyRegistrant( new AsyncResult (null, ret, null)); } break; //.............. }
进入Registrant类中
public void notifyRegistrant(AsyncResult ar){ internalNotifyRegistrant (ar.result, ar.exception); }
/*package*/ void internalNotifyRegistrant (Object result, Throwable exception) { Handler h = getHandler(); if (h == null) { clear(); } else { Message msg = Message.obtain(); msg.what = what; msg.obj = new AsyncResult(userObj, result, exception); h.sendMessage(msg); } }
当PhoneApp收到:PHONE_NEW_RINGING_CONNECTION后
/** * Handles a "new ringing connection" event from the telephony layer. */ private void onNewRingingConnection(AsyncResult r) { Connection c = (Connection) r.result; log("onNewRingingConnection(): state = " + mCM.getState() + ", conn = { " + c + " }"); Call ringing = c.getCall(); Phone phone = ringing.getPhone(); // Check for a few cases where we totally ignore incoming calls. if (ignoreAllIncomingCalls(phone)) { // Immediately reject the call, without even indicating to the user // that an incoming call occurred. (This will generally send the // caller straight to voicemail, just as if we *had* shown the // incoming-call UI and the user had declined the call.) PhoneUtils.hangupRingingCall(ringing); return; } if (c == null) { Log.w(LOG_TAG, "CallNotifier.onNewRingingConnection(): null connection!"); // Should never happen, but if it does just bail out and do nothing. return; } if (!c.isRinging()) { Log.i(LOG_TAG, "CallNotifier.onNewRingingConnection(): connection not ringing!"); // This is a very strange case: an incoming call that stopped // ringing almost instantly after the onNewRingingConnection() // event. There's nothing we can do here, so just bail out // without doing anything. (But presumably we'll log it in // the call log when the disconnect event comes in...) return; } // Stop any signalInfo tone being played on receiving a Call stopSignalInfoTone(); Call.State state = c.getState(); // State will be either INCOMING or WAITING. if (VDBG) log("- connection is ringing! state = " + state); // if (DBG) PhoneUtils.dumpCallState(mPhone); // No need to do any service state checks here (like for // "emergency mode"), since in those states the SIM won't let // us get incoming connections in the first place. // TODO: Consider sending out a serialized broadcast Intent here // (maybe "ACTION_NEW_INCOMING_CALL"), *before* starting the // ringer and going to the in-call UI. The intent should contain // the caller-id info for the current connection, and say whether // it would be a "call waiting" call or a regular ringing call. // If anybody consumed the broadcast, we'd bail out without // ringing or bringing up the in-call UI. // // This would give 3rd party apps a chance to listen for (and // intercept) new ringing connections. An app could reject the // incoming call by consuming the broadcast and doing nothing, or // it could "pick up" the call (without any action by the user!) // via some future TelephonyManager API. // // See bug 1312336 for more details. // We'd need to protect this with a new "intercept incoming calls" // system permission. // Obtain a partial wake lock to make sure the CPU doesn't go to // sleep before we finish bringing up the InCallScreen. // (This will be upgraded soon to a full wake lock; see // showIncomingCall().) if (VDBG) log("Holding wake lock on new incoming connection."); mApplication.requestWakeState(PhoneApp.WakeState.PARTIAL); // - don't ring for call waiting connections // - do this before showing the incoming call panel if (PhoneUtils.isRealIncomingCall(state)) { startIncomingCallQuery(c); } else { if (VDBG) log("- starting call waiting tone..."); if (mCallWaitingTonePlayer == null) { mCallWaitingTonePlayer = new InCallTonePlayer(InCallTonePlayer.TONE_CALL_WAITING); mCallWaitingTonePlayer.start(); } // in this case, just fall through like before, and call // showIncomingCall(). if (DBG) log("- showing incoming call (this is a WAITING call)..."); showIncomingCall(); } // Note we *don't* post a status bar notification here, since // we're not necessarily ready to actually show the incoming call // to the user. (For calls in the INCOMING state, at least, we // still need to run a caller-id query, and we may not even ring // at all if the "send directly to voicemail" flag is set.) // // Instead, we update the notification (and potentially launch the // InCallScreen) from the showIncomingCall() method, which runs // when the caller-id query completes or times out. if (VDBG) log("- onNewRingingConnection() done."); }
调用showIncomingCall();函数显示来电界面
private void showIncomingCall() { log("showIncomingCall()... phone state = " + mCM.getState()); // Before bringing up the "incoming call" UI, force any system // dialogs (like "recent tasks" or the power dialog) to close first. try { ActivityManagerNative.getDefault().closeSystemDialogs("call"); } catch (RemoteException e) { } mApplication.preventScreenOn(true); mApplication.requestWakeState(PhoneApp.WakeState.FULL); // Post the "incoming call" notification *and* include the // fullScreenIntent that'll launch the incoming-call UI. // (This will usually take us straight to the incoming call // screen, but if an immersive activity is running it'll just // appear as a notification.) if (DBG) log("- updating notification from showIncomingCall()..."); mApplication.notificationMgr.updateNotificationAndLaunchIncomingCallUi(); }
NotificationMgr.java
public void updateNotificationAndLaunchIncomingCallUi() { // Set allowFullScreenIntent=true to indicate that we *should* // launch the incoming call UI if necessary. updateInCallNotification(true); }
private void updateInCallNotification(boolean allowFullScreenIntent) { // incoming call is ringing: if (hasRingingCall) { if (DBG) log("- Using hi-pri notification for ringing call!"); // This is a high-priority event that should be shown even if the // status bar is hidden or if an immersive activity is running. notification.flags |= Notification.FLAG_HIGH_PRIORITY; notification.tickerText = expandedViewLine2; if (allowFullScreenIntent) { if (DBG) log("- Setting fullScreenIntent: " + inCallPendingIntent); notification.fullScreenIntent = inCallPendingIntent; Call ringingCall = mCM.getFirstActiveRingingCall(); if ((ringingCall.getState() == Call.State.WAITING) && !mApp.isShowingCallScreen()) { Log.i(LOG_TAG, "updateInCallNotification: call-waiting! force relaunch..."); // Cancel the IN_CALL_NOTIFICATION immediately before // (re)posting it; this seems to force the // NotificationManager to launch the fullScreenIntent. mNotificationManager.cancel(IN_CALL_NOTIFICATION); } } } if (DBG) log("Notifying IN_CALL_NOTIFICATION: " + notification); mNotificationManager.notify(IN_CALL_NOTIFICATION, notification); // Finally, refresh the mute and speakerphone notifications (since // some phone state changes can indirectly affect the mute and/or // speaker state). updateSpeakerNotification(); updateMuteNotification(); }
PendingIntent inCallPendingIntent =
PendingIntent.getActivity(mContext, 0,
PhoneApp.createInCallIntent(), 0);
notification.contentIntent = inCallPendingIntent;
/* package */static Intent createInCallIntent() { Intent intent = new Intent(Intent.ACTION_MAIN, null); intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS | Intent.FLAG_ACTIVITY_NO_USER_ACTION); intent.setClassName("com.android.phone", getCallScreenClassName()); return intent; }
static String getCallScreenClassName() { return InCallScreen.class.getName(); }
通过PendingIntent来启动InCallScreen来电界面,接听后就跟拨号界面一样了。
在测试android:persistent="true"时,编写了一个测试程序,一定要安装在system/app/目录下,在开机时才会启动,在程序启动后不会被系统回收,非常简单
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.dzt.persistentdemo" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="17" /> <application android:name="PersionApp" android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:persistent="true" android:theme="@style/AppTheme" > <activity android:name="com.dzt.persistentdemo.MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
开机后会打印在程序中添加的消息
sh-4.2# logcat -v time | grep PersionApp 01-02 00:18:46.090 I/PersionApp( 1033): [PersionApp]------------------->onCreate test 01-02 00:18:46.090 I/PersionApp( 1033): [Persion]----------------------------->Persion 01-02 00:18:46.090 I/PersionApp( 1033): [PersionApp]------------------->onCreate persion = null
示例代码:http://download.csdn.net/detail/deng0zhaotai/7714163
Android4.0(Phone)来电过程分析