Android6.0来电号码与电话薄联系人进行匹配

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/serviceCall.java
public 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.java
public 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.java
TelecomSystem.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

 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);
 }
 
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/baseCallerInfoAsyncQuery.java
public 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.java
public 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.java
public 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.java
protected 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.java
public 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。

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