android - TTS 回调 : dispatch completed to 1

Question

我创建了一个实现 OnUtteranceCompleteListener 的小型 TTS 应用程序，虽然一切似乎都按预期工作，但我在 LogCat 上注意到以下内容(每个完成的话语一个):

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

同样，这似乎是良性的，但我不明白“1”是什么意思。所有话语的所有此类行都表示“完成到 1”，即使对于大于 1 的话语 ID 也是如此。

此日志中的“1”是什么意思？

顺便说一句，这条消息不是由我的代码生成的，而是由 TTS 引擎 (Pico) 本身生成的。

Answer 1

查看 TTSService.java源代码可在 http://eyes-free.googlecode.com 获得你可以找到函数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为N的当前值，由mCallbacks.beginBroadcast()的返回值初始化。

beginBroadcast()是类 RemoteCallbackList 的方法其文档说明它:

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

这有帮助吗？