如何将OnUtteranceProgressListener()与TTS一起使用

Question

我想根据TTS的状态Toast一条消息。为此，我使用了OnUtteranceProgressListener((。但我没有得到结果。我怎样才能完成这项任务？

下面给出的代码用于初始化TTS类。

textToSpeech=new TextToSpeech(this, new TextToSpeech.OnInitListener() {
@Override
public void onInit(int i) {
//Check if initialisation is successful
if(i==TextToSpeech.SUCCESS)
{
//set Language
int result=textToSpeech.setLanguage(Locale.ENGLISH);
//Check if language is set successfully or not.
if(result==TextToSpeech.LANG_NOT_SUPPORTED||result==TextToSpeech.LANG_MISSING_DATA)
{
Toast.makeText(MainActivity.this, "Language not supported", Toast.LENGTH_SHORT).show();
}
else{
Toast.makeText(MainActivity.this, "Welcome", Toast.LENGTH_SHORT).show();
textToSpeech.setOnUtteranceProgressListener(new UtteranceProgressListener() {
@Override
public void onStart(String s) {
Toast.makeText(MainActivity.this, "Started", Toast.LENGTH_SHORT).show();
}
@Override
public void onDone(String s) {
Toast.makeText(MainActivity.this,"Done",Toast.LENGTH_SHORT).show();
}
@Override
public void onError(String s) {
Toast.makeText(MainActivity.this, "Error", Toast.LENGTH_SHORT).show();
}
});
}
}
else{
Toast.makeText(MainActivity.this, "Initialisation failed", Toast.LENGTH_SHORT).show();
}
}
});

下面给出的代码用于触发事件

btnSpeak.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
speak();
}
});

speak((函数定义：

private void speak() {
String text="Good Morning";
float pitch=(float)seekBarPitch.getProgress()/50;
float speed=(float)seekBarSpeed.getProgress()/50;
textToSpeech.setPitch(pitch);
textToSpeech.setSpeechRate(speed);
textToSpeech.speak(text,TextToSpeech.QUEUE_FLUSH,null,"UTTERANCE_ID");
}

Answer 1

Toast消息在后台线程中不起作用。所以我们必须使用runOnUIThread((在UI线程上运行它；