我使用 TextToSpeech 有时会打一些长文，我已经注意到，由于安卓4.1.2 如果文本的长度超过4000个字符，不玩了。

我没有得到任何错误，但文字不会被播放。到现在为止，我能够重现这只是安卓4.1.2 （三星Galaxy Nexus的，Nexus7）。

这是只是在一个错误 4.1.2 或这是正常的（虽然我没有找到有关此问题的任何文件）？

此外，我找到了一个帖子：onUtteranceCompleted()如果TTS收到过长这说明不同的问题与文本超过4000个字符再丢失。

编辑：我​​试图用来分割我的字符串在4K长块，并将其发送到 TTS QUEUE_ADD 和我遇到另一个bug: QUEUE_ADD 不工作，而是刷新现有的队列中，只有最后一块被打了。

EDIT2 ：这是我的电话，以 TTS

  mTTS.speak（LONGTEXT，TextToSpeech.QUEUE_FLUSH，NULL）;
 

解决方案

MAX_SPEECH_ITEM_CHAR_LENGTH = 4000 TtsService.java，对4.1我看到一个警告，在code：

  @覆盖
    公共布尔参考isValid（）{
        如果（MTEXT == NULL）{
            Log.wtf（TAG，得到空文）;
            返回false;
        }
        如果（mText.length（）＆GT; = MAX_SPEECH_ITEM_CHAR_LENGTH）{
            Log.w（TAG，文本太长：+ mText.length（）+字符）;
            返回false;
        }
        返回true;
    }
 

看起来像2.3分裂的文字来代替，所以teorically您code应该工作在Android＆LT; 4.1，而不是新的（除去拆分的时候，我不知道），而不是你有相反的:)这是一个有点奇怪

I am using TextToSpeech to play some long texts sometimes, and I have noticed that since Android 4.1.2 if the text is longer than 4000 chars, it does not play.

I do not get any errors, but the text won't be played. Until now I was able to reproduce this just on Android 4.1.2(Samsung Galaxy Nexus, Nexus7).

Is this a bug just in 4.1.2 or is this normal (although I did not find any documentation regarding this behaviour)?

Also I have found a post : onUtteranceCompleted() lost if TTS received is too long which indicates different problems with texts longer than 4000 chars.

EDIT: I tried to split my string in 4k length chunks, and send it to TTS using QUEUE_ADD and I came across another bug: QUEUE_ADD does not work, instead it flushes the existing queue, and only the last chunk gets played.

EDIT2 : this is my call to TTS

mTTS.speak(longText, TextToSpeech.QUEUE_FLUSH, null);

MAX_SPEECH_ITEM_CHAR_LENGTH = 4000 in TtsService.java, on 4.1 I see a warn in the code:

    @Override
    public boolean isValid() {
        if (mText == null) {
            Log.wtf(TAG, "Got null text");
            return false;
        }
        if (mText.length() >= MAX_SPEECH_ITEM_CHAR_LENGTH) {
            Log.w(TAG, "Text too long: " + mText.length() + " chars");
            return false;
        }
        return true;
    }

looks like 2.3 splits the text instead, so teorically your code should work on android < 4.1 and not on newer (I don't known when the split was removed), instead you have the opposite :) that is a bit strange