我正在尝试使用
Android Text To Speech讲出大量文本.我使用默认的Google语音引擎.以下是我的代码.
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,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();
}
}
但问题是,当存在大量文本时(假设您已从网页中提取文本),TTS无法读取它.如果我删除大部分文本,那么它将读取它.为什么会这样？
10-11 07:26:05.566: D/dalvikvm(2638): GC_CONCURRENT freed 362K,44% free 3597K/6312K,paused 17ms+8ms,total 93ms
解决方法
字符串长度不应超过预定义的长度,从
docs开始：
Parameters
text The string of text to be spoken. No longer than 07001 characters.
getMaxSpeechInputLength()返回的值可能因设备而异,但根据AOSP source,高达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：将输入文本长度与该值进行比较,并在必要时拆分为单独的部分.
