TTS callback: dispatch completed to 1

I created a small TTS app implementing OnUtteranceCompleteListener and, while things seem to be working exactly as expected, I noticed the following on LogCat (one for each completed utterance):

03-01 20:47:06.436: VERBOSE/TtsService(381): TTS callback: dispatch completed to 1

Again, this seems to be benign but I don't understand what '1' means. All such lines for all utterances say "completed to 1", even for utterance IDs that are grea开发者_JAVA百科ter than 1.

What does '1' mean in this log?

BTW, this message is not generated by my code but rather by the TTS engine (Pico) itself.

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Looking at the TTSService.java source code available at http://eyes-free.googlecode.com you can find the function dispatchUtteranceCompletedCallback():

private void dispatchUtteranceCompletedCallback(String utteranceId, String packageName) {
    /* Legacy support for TTS */
    final int oldN = mCallbacksOld.beginBroadcast();
    for (int i = 0; i < oldN; i++) {
        try {
            mCallbacksOld.getBroadcastItem(i).markReached("");
        } catch (RemoteException e) {
            // The RemoteCallbackList will take care of removing
            // the dead object for us.
        }
    }
    try {
        mCallbacksOld.finishBroadcast();
    } catch (IllegalStateException e) {
        // May get an illegal state exception here if there is only
        // one app running and it is trying to quit on completion.
        // This is the exact scenario triggered by MakeBagel
        return;
    }
    /* End of legacy support for TTS */
    ITtsCallbackBeta cb = mCallbacksMap.get(packageName);
    if (cb == null) {
        return;
    }
    Log.v(SERVICE_TAG, "TTS callback: dispatch started");
    // Broadcast to all clients the new value.
    final int N = mCallbacks.beginBroadcast();
    try {
        cb.utteranceCompleted(utteranceId);
    } catch (RemoteException e) {
        // The RemoteCallbackList will take care of removing
        // the dead object for us.
    }
    mCallbacks.finishBroadcast();
    Log.v(SERVICE_TAG, "TTS callback: dispatch completed to " + N);
}

1 is the current value of N, which is initialized by the return value from mCallbacks.beginBroadcast().

beginBroadcast() is a method of the class RemoteCallbackList and its documentation states that it:

Returns the number of callbacks in the broadcast, to be used with getBroadcastItem(int) to determine the range of indices you can supply

Does this help?