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TTS回调：调度完成至1

发布于 2024-10-20 03:36:10 字数 379 浏览 2 评论 0原文

我创建了一个实现 OnUtteranceCompleteListener 的小型 TTS 应用程序，虽然事情似乎完全按预期工作，但我在 LogCat 上注意到以下内容（每个完整的话语一个）：

03-01 20:47:06.436: 详细/TtsService(381)：TTS 回调：发送完成至 1

再次，这似乎是良性的，但我不明白“1”的含义。所有话语的所有此类行都显示“已完成到 1”，即使对于大于 1 的话语 ID。

“1”在此日志中意味着什么？

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

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紫竹語嫣☆ 2024-10-27 03:36:10

查看 TTSService。 java 源代码位于 http://eyes-free.googlecode.com 您可以找到函数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是N的当前值，它由mCallbacks.beginBroadcast()的返回值初始化。

beginBroadcast() 是该类的方法RemoteCallbackList 及其文档指出：

返回回调的数量
广播，与使用
getBroadcastItem(int) 来确定
您可以提供的指数范围

这有帮助吗？

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: