本文将介绍系统接收到来电之后，如何在电话薄中进行匹配联系人的流程。分析将从另外一篇文章（基于Android6.0的RIL框架层模块分析）中提到的与本文内容相关的代码开始。
//packages/service/***/Call.javapublic void handleCreateConnectionSuccess( CallIdMapper idMapper, ParcelableConnection connection) { setHandle(connection.getHandle(), connection.getHandlePresentation());//这个函数很重要，会启动一个查询 setCallerDisplayName(connection.getCallerDisplayName(), connection.getCallerDisplayNamePresentation()); setExtras(connection.getExtras()); if (mIsIncoming) { // We do not handle incoming calls immediately when they are verified by the connection // service. We allow the caller-info-query code to execute first so that we can read the // direct-to-voicemail property before deciding if we want to show the incoming call to // the user or if we want to reject the call. mDirectToVoicemailQueryPending = true; // Timeout the direct-to-voicemail lookup execution so that we dont wait too long before // showing the user the incoming call screen. mHandler.postDelayed(mDirectToVoicemailRunnable, Timeouts.getDirectToVoicemailMillis( mContext.getContentResolver())); }}
这个setHandle函数如下：
//Call.javapublic void setHandle(Uri handle, int presentation) { startCallerInfoLookup();}private void startCallerInfoLookup() { final String number = mHandle == null ? null : mHandle.getSchemeSpecificPart(); mQueryToken++; // Updated so that previous queries can no longer set the information. mCallerInfo = null; if (!TextUtils.isEmpty(number)) { mHandler.post(new Runnable() { @Override public void run() { mCallerInfoAsyncQueryFactory.startQuery(mQueryToken, mContext,number,mCallerInfoQueryListener,Call.this); }}); }}
注意后面post的那个Runnable。这个就是启动查询号码的逻辑了。这个mCallerInfoAsyncQueryFactory的赋值的流程比较曲折。在TelecomService被连接上调用onBind的时候，会调用initializeTelecomSystem函数。那这个TelecomService是在哪里被启动的呢？在TelecomLoaderService.java里面定义了：
private static final ComponentName SERVICE_COMPONENT = new ComponentName( "com.android.server.telecom", "com.android.server.telecom.components.TelecomService");private void connectToTelecom() { synchronized (mLock) { TelecomServiceConnection serviceConnection = new TelecomServiceConnection(); Intent intent = new Intent(SERVICE_ACTION); intent.setComponent(SERVICE_COMPONENT); // Bind to Telecom and register the service if (mContext.bindServiceAsUser(intent, serviceConnection, flags, UserHandle.OWNER)) { mServiceConnection = serviceConnection; } }}public void onBootPhase(int phase) {//这个在系统启动阶段就会触发 if (phase == PHASE_ACTIVITY_MANAGER_READY) { connectToTelecom(); }}
所以从这里看，在系统启动阶段就会触发TelecomService这个service，且在成功连接到服务之后，将调用ServiceManager.addService(Context.TELECOM_SERVICE, service)，将这个服务添加到系统服务中了。这个类的构造函数中，在调用函数initializeTelecomSystem初始化TelecomSystem时，就实例化了一个内部匿名对象，并且在TelecomSystem的构造函数中初始化一个mCallsManager时将该匿名对象传入，而在CallsManager的processIncomingCallIntent中会用这个函数初始化一个Call对象。所以这个mCallerInfoAsyncQueryFactory的实际内容见TelecomService中的initializeTelecomSystem：
//TelecomService.javaTelecomSystem.setInstance( new TelecomSystem( context, new MissedCallNotifierImpl(context.getApplicationContext()), new CallerInfoAsyncQueryFactory() { @Override public CallerInfoAsyncQuery startQuery(int token, Context context, String number,CallerInfoAsyncQuery.OnQueryCompleteListener listener, Object cookie) { return CallerInfoAsyncQuery.startQuery(token, context, number, listener, cookie); }}, new HeadsetMediaButtonFactory() {}, new ProximitySensorManagerFactory() {}, new InCallWakeLockControllerFactory() {}, new ViceNotifier() {}));
可以看到，通过startQuery来查询传入的number的动作。我们来看看CallerInfoAsyncQuery的startQuery函数。
//frameworks/base/telephony/java/com/android/internal/CallerInfoAsyncQuery.java/** * Factory method to start the query based on a number. * * Note: if the number contains an "@" character we treat it * as a SIP address, and look it up directly in the Data table * rather than using the PhoneLookup table. * TODO: But eventually we should expose two separate methods, one for * numbers and one for SIP addresses, and then have * PhoneUtils.startGetCallerInfo() decide which one to call based on * the phone type of the incoming connection. */ public static CallerInfoAsyncQuery startQuery(int token, Context context, String number, OnQueryCompleteListener listener, Object cookie) { int subId = SubscriptionManager.getDefaultSubId(); return startQuery(token, context, number, listener, cookie, subId); }/** * Factory method to start the query with a Uri query spec. */ public static CallerInfoAsyncQuery startQuery(int token, Context context, Uri contactRef, OnQueryCompleteListener listener, Object cookie) {c.mHandler.startQuery(token, cw, // cookie contactRef, // uri，注意这里的查询地址 null, // projection null, // selection null, // selectionArgs null); // orderBy return c;}
注意看注释，该函数还会对SIP号码（包含@的号码）进行处理，还有紧急号码和语音邮箱号码进行区分。实际上，当对一个号码进行查询的时候，这三个startQuery都用到了。注意，上面的startQuery会根据结果对connection的值进行修改。
其中将号码转换成uri格式的数据，后续会对这个数据进行查询：
//frameworks/base/***/CallerInfoAsyncQuery.javapublic static CallerInfoAsyncQuery startQuery(int token, Context context, String number, OnQueryCompleteListener listener, Object cookie, int subId) { // Construct the URI object and query params, and start the query. final Uri contactRef = PhoneLookup.ENTERPRISE_CONTENT_FILTER_URI.buildUpon().appendPath(number) .appendQueryParameter(PhoneLookup.QUERY_PARAMETER_SIP_ADDRESS, String.valueOf(PhoneNumberUtils.isUriNumber(number))) .build(); CallerInfoAsyncQuery c = new CallerInfoAsyncQuery(); c.allocate(context, contactRef); //create cookieWrapper, start query CookieWrapper cw = new CookieWrapper(); cw.listener = listener; cw.cookie = cookie; cw.number = number; cw.subId = subId; // check to see if these are recognized numbers, and use shortcuts if we can. if (PhoneNumberUtils.isLocalEmergencyNumber(context, number)) { cw.event = EVENT_EMERGENCY_NUMBER; } else if (PhoneNumberUtils.isVoiceMailNumber(subId, number)) { cw.event = EVENT_VOICEMAIL_NUMBER; } else { cw.event = EVENT_NEW_QUERY; } c.mHandler.startQuery(token, cw, // cookie contactRef, // uri null, // projection null, // selection null, // selectionArgs null); // orderBy return c;}
这个函数里面的contactRef的值应该是“content://com.android.contacts/phone_lookup_enterprise/13678909678/sip?”类似的。
实际上这个query是调用CallerInfoAsyncQueryHandler的startQuery函数，而这个函数是直接调用它的父类AsyncQueryHandler的同名函数。
//AsyncQueryHandler.javapublic void startQuery(int token, Object cookie, Uri uri, String[] projection, String selection, String[] selectionArgs, String orderBy) { // Use the token as what so cancelOperations works properly Message msg = mWorkerThreadHandler.obtainMessage(token); msg.arg1 = EVENT_ARG_QUERY; WorkerArgs args = new WorkerArgs(); args.handler = this; args.uri = uri; msg.obj = args; mWorkerThreadHandler.sendMessage(msg);}
这个mWorkerThreadHandler是在CallerInfoAsyncQueryHandler函数覆写父类的createHandler函数中赋值，是CallerInfoWorkerHandler类型。所以后续的处理函数是该类的handleMessage函数。
//AsyncQueryHandler.javapublic void handleMessage(Message msg) { WorkerArgs args = (WorkerArgs) msg.obj; CookieWrapper cw = (CookieWrapper) args.cookie; if (cw == null) { // Normally, this should never be the case for calls originating // from within this code. // However, if there is any code that this Handler calls (such as in // super.handleMessage) that DOES place unexpected messages on the // queue, then we need pass these messages on. } else { switch (cw.event) { case EVENT_NEW_QUERY://它的值跟AsyncQueryHandler的EVENT_ARG_QUERY一样，都是1 //start the sql command. super.handleMessage(msg); break; case EVENT_END_OF_QUEUE: // query was already completed, so just send the reply. // passing the original token value back to the caller // on top of the event values in arg1. Message reply = args.handler.obtainMessage(msg.what); reply.obj = args; reply.arg1 = msg.arg1; reply.sendToTarget(); break; default: }}}}
这个super就是AsyncQueryHandler的内部类WorkerHandler了。
//AsyncQueryHandler.javaprotected class WorkerHandler extends Handler { @Override public void handleMessage(Message msg) { final ContentResolver resolver = mResolver.get(); WorkerArgs args = (WorkerArgs) msg.obj; int token = msg.what; int event = msg.arg1; switch (event) { case EVENT_ARG_QUERY: Cursor cursor; try { cursor = resolver.query(args.uri, args.projection, args.selection, args.selectionArgs, args.orderBy); // Calling getCount() causes the cursor window to be filled, // which will make the first access on the main thread a lot faster. if (cursor != null) { cursor.getCount(); }} args.result = cursor; break; } // passing the original token value back to the caller // on top of the event values in arg1. Message reply = args.handler.obtainMessage(token); reply.obj = args; reply.arg1 = msg.arg1; reply.sendToTarget(); }}
可以看到流程就是简单的用resolver.query来查询指定的query URI，然后将返回值通过消息机制发送到AsyncQueryHandler的handleMessage里面处理，而在这里会调用CallerInfoAsyncQuery的onQueryComplete函数。注意这个ContentResolver是在uri上查询结果，而这个uri是由某个ContentProvider来提供的。注意这个地址里面的authorities里面的值为”com.android.contacts”，同样看看ContactsProvider的androidmanifest.xml文件：
<provider android:name="ContactsProvider2" android:authorities="contacts;com.android.contacts" android:readPermission="android.permission.READ_CONTACTS" android:writePermission="android.permission.WRITE_CONTACTS"> <path-permission android:pathPrefix="/search_suggest_query" android:readPermission="android.permission.GLOBAL_SEARCH" /> <path-permission android:pathPattern="/contacts/.*/photo" android:readPermission="android.permission.GLOBAL_SEARCH" /> <grant-uri-permission android:pathPattern=".*" /> </provider>
所以最后这个查询是由ContactsProvider来执行的。
我们来看看查询完成之后，调用CallerInfoAsyncQuery的onQueryComplete函数的具体流程：
protected void onQueryComplete(int token, Object cookie, Cursor cursor) { // check the token and if needed, create the callerinfo object. if (mCallerInfo == null) { if (cw.event == EVENT_EMERGENCY_NUMBER) { } else if (cw.event == EVENT_VOICEMAIL_NUMBER) { } else { mCallerInfo = CallerInfo.getCallerInfo(mContext, mQueryUri, cursor); } } } //notify the listener that the query is complete. if (cw.listener != null) { cw.listener.onQueryComplete(token, cw.cookie, mCallerInfo); } }}
注意，上面代码里面的CallerInfo.getCallerInfo非常重要。在这里面会使用查询处理的cursor结果，并将合适的结果填充到mCallerInfo，将其传递到cw.listener.onQueryComplete函数中，作为最终结果进行进一步处理。
//CallerInfo.javapublic static CallerInfo getCallerInfo(Context context, Uri contactRef, Cursor cursor) { CallerInfo info = new CallerInfo(); if (cursor != null) { if (cursor.moveToFirst()) { columnIndex = cursor.getColumnIndex(PhoneLookup.LOOKUP_KEY); if (columnIndex != -1) { info.lookupKey = cursor.getString(columnIndex); } info.contactExists = true; } cursor.close(); cursor = null; } info.needUpdate = false; info.name = normalize(info.name); info.contactRefUri = contactRef; return info;}
系统原生的逻辑是取搜索结果的第一个记录，并用来实例化。当客户需求改变，需要匹配不同号码的时候，就需要修改这个地方的了。最优先是遍历整个cursor集合，并且根据客户需求选出适合的结果，赋值给CallerInfo实例。
下面是整个号码匹配的流程图：
Call.java会将查询后的结果设置到Call实例里面，并将其传送到CallsManager里面进行后续处理。而这个CallsManager会将这个Call显示给客户。
当网络端来电时，frame层会接收到，并且连接成功之后会触发Call.java里面的handleCreateConnectionSuccess。这个函数逻辑是从数据库中查询复合要求的联系人，并且只取结果集的第一条记录，用来初始化这个Call里面的变量。而后将这个Call传到CallsManager进行处理，显示给用户。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
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