Android的TTS没有说话大量的文字 [英] Android TTS fails to speak large amount of text
问题描述
我想使用Android的文本到语音说出大量的文字。我用默认的谷歌语音引擎。下面是我的code。
I am trying to speak out large amount of text using android Text To Speech. I using default google speech engine. Below is my code.
public class Talk extends Activity implements TextToSpeech.OnInitListener {
private ImageView playBtn;
private EditText textField;
private TextToSpeech tts;
private boolean isSpeaking = false;
private String finalText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_talk);
//Intialize the instance variables
playBtn = (ImageView)findViewById(R.id.playBtn);
textField = (EditText)findViewById(R.id.textField);
//Resister the listeners
playBtn.setOnClickListener(new PlayBtnAction());
//Other things
tts = new TextToSpeech(this,this);
//Get the web page text if called from Share-Via
if (Intent.ACTION_SEND.equals(getIntent().getAction()))
{
new GetWebText().execute("");
}
}
//This class will execute the text from web pages
private class GetWebText extends AsyncTask<String,Void,String>
{
@Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
String text = getIntent().getStringExtra(Intent.EXTRA_TEXT);
String websiteText = "";
try {
//Create a URL for the desired page
URL url = new URL(text);
// Read all the text returned by the server
BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
String str;
StringBuffer strBuffer = new StringBuffer("");
while ((str = in.readLine()) != null)
{
strBuffer.append(str+"\n"+"\n");
}
in.close();
String html = strBuffer.toString();
Document doc = Jsoup.parse(html);
websiteText = doc.body().text(); // "An example link"
//Toast.makeText(this, websiteText, Toast.LENGTH_LONG).show();
}
catch(Exception e)
{
Log.e("web_error", "Error in getting web text",e);
}
return websiteText;
}
@Override
protected void onPostExecute(String result)
{
textField.setText(result);
}
}
}
//Class to speak the text
private class PlayBtnAction implements OnClickListener
{
@Override
public void onClick(View v)
{
// TODO Auto-generated method stub
if(!isSpeaking)
{
isSpeaking = true;
//speak(textField.getText().toString());
finalText = textField.getText().toString();
new SpeakTheText().execute(finalText);
isSpeaking = false;
}
else
{
isSpeaking = false;
tts.stop();
}
}
}
@Override
public void onInit(int status) {
// TODO Auto-generated method stub
if(status==TextToSpeech.SUCCESS)
{
int result = tts.setLanguage(Locale.UK);
if(result==TextToSpeech.LANG_MISSING_DATA || result == TextToSpeech.LANG_NOT_SUPPORTED)
{
Toast.makeText(this, "Language Not Supported", Toast.LENGTH_LONG).show();
}
}
}
//This class will speak the text
private class SpeakTheText extends AsyncTask<String,Void,String>
{
@Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
tts.speak(params[0], TextToSpeech.QUEUE_FLUSH, null);
return null;
}
}
@Override
public void onDestroy()
{
if(tts!=null)
{
tts.stop();
tts.shutdown();
}
super.onDestroy();
}
}
但这里的问题是，当有文本的一大块（可以说你已经提取网页中的文本）的TTS无法读取它。如果我删除大部分的文字，那么它会读取它。这究竟是为什么？
But the issue here is, when there is a large chunk of text (lets say you have extracted text from a web page) the TTS fails to read it. If I remove most of the text, then it will read it. Why is this happening?
当我即将读取大文本，在LogCat中却显示这样的事情
When I am about to read the large text, the LogCat however display something like this
10-11 07:26:05.566: D/dalvikvm(2638): GC_CONCURRENT freed 362K, 44% free 3597K/6312K, paused 17ms+8ms, total 93ms
请帮忙。
推荐答案
字符串长度应不超过pre-定义的长度，从<一个href="https://developer.android.com/reference/android/speech/tts/TextToSpeech.html#speak%28java.lang.String,%20int,%20java.util.HashMap%3Cjava.lang.String,%20java.lang.String%3E%29"相对=nofollow>文档：
The String length should not be longer than pre-defined length, from docs:
参数
文本的文本字符串进行朗读。不超过<一个href="https://developer.android.com/reference/android/speech/tts/TextToSpeech.html#getMaxSpeechInputLength%28%29"相对=nofollow> getMaxSpeechInputLength（）的字符。
text The string of text to be spoken. No longer than getMaxSpeechInputLength() characters.
返回 getMaxSpeechInputLength（）可以从设备到设备各不相同，但根据<值href="https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/speech/tts/TextToSpeech.java"相对=nofollow> 的AOSP源的高达的 4000
Returned value by getMaxSpeechInputLength() may vary from device to device, but according to AOSP source that is whopping 4000:
/**
* Limit of length of input string passed to speak and synthesizeToFile.
*
* @see #speak
* @see #synthesizeToFile
*/
public static int getMaxSpeechInputLength() {
return 4000;
}
尽量不要超过该限制：与该值进行比较，输入文本的长度和分割成独立的部分，如果有必要
Try not to exceed that limit: compare input text length with that value and split into separate parts if necessary.
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