当其从所谓的OnStart API文字转语音不工作 [英] TextToSpeech API doesn't work when its called from OnStart

问题描述

我使用的文字转语音API在我的code，当我尝试从的OnStart（）调用.speak（）函数，它不工作，但它的工作原理，当我把它从一个按钮onClickListener（） 。知道为什么吗？谢谢你。

 公共类TtsDemoActivity延伸活动{    私人文字转语音MTTS;
    私人OnClickListener buttonListener =新View.OnClickListener（）{        @覆盖
        公共无效的onClick（查看为arg0）{
            播放声音（）;
        }
    };    @覆盖
    保护无效的onCreate（捆绑savedInstanceState）{
        // TODO自动生成方法存根
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.ttsdemo）;        //初始化文本到语音
        MTTS =新的文字转语音（这一点，新TextToSpeech.OnInitListener（）{            @覆盖
            公共无效的OnInit（INT为arg0）{
                // TODO自动生成方法存根            }
        }）;        按钮则myButton =（按钮）findViewById（R.id.buttontts1）;
        myButton.setOnClickListener（buttonListener）;
    }    @覆盖
    保护无效调用onStart（）{
        // TODO自动生成方法存根
        super.onStart（）;
        播放声音（）;
    }    保护无效PlaySound（）
    {
        串词=Hello World的;        mTts.speak（文字，TextToSpeech.QUEUE_FLUSH，NULL）;    }
 

解决方案

您必须等到TTS子系统的信号，它已准备就绪：如果还没有准备好当在onStart 被调用，它就会失败。如果你想为它准备呼吁尽快讲 PlaySound 从里面的 OnInitListener ：

  @覆盖
    保护无效的onCreate（捆绑savedInstanceState）{
        // TODO自动生成方法存根
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.ttsdemo）;        //初始化文本到语音
        MTTS =新的文字转语音（这一点，新TextToSpeech.OnInitListener（）{            @覆盖
            公共无效的OnInit（INT为arg0）{
如果（arg0中== TextToSpeech.SUCCESS）PlaySound（）;            }
        }）;        按钮则myButton =（按钮）findViewById（R.id.buttontts1）;
        myButton.setOnClickListener（buttonListener）;
    }
 

I'm using the TextToSpeech API in my code and it doesn't work when I try to call .speak() function from OnStart(), however it works when I call it from a button onClickListener(). Any idea why? Thank you.

public class TtsDemoActivity extends Activity {

    private TextToSpeech mTts;
    private OnClickListener buttonListener = new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {
            PlaySound();
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.ttsdemo);

        // Initialize Text To speech
        mTts = new TextToSpeech(this, new TextToSpeech.OnInitListener() {

            @Override
            public void onInit(int arg0) {
                // TODO Auto-generated method stub

            }
        });

        Button myButton = (Button)findViewById(R.id.buttontts1);
        myButton.setOnClickListener(buttonListener);
    }

    @Override
    protected void onStart() {
        // TODO Auto-generated method stub
        super.onStart();
        PlaySound();
    }

    protected void PlaySound()
    {
        String word = "Hello world";

        mTts.speak(word, TextToSpeech.QUEUE_FLUSH, null);

    }

解决方案

You must wait until the TTS subsystem signals that it is ready: if it isn't ready when onStart is called, it will fail. If you are trying to speak as soon as it is ready call PlaySound from inside the OnInitListener:

@Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.ttsdemo);

        // Initialize Text To speech
        mTts = new TextToSpeech(this, new TextToSpeech.OnInitListener() {

            @Override
            public void onInit(int arg0) {
if(arg0 == TextToSpeech.SUCCESS) PlaySound();

            }
        });

        Button myButton = (Button)findViewById(R.id.buttontts1);
        myButton.setOnClickListener(buttonListener);
    }

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