Question

我在我的代码中使用TextToSpeech API，当我尝试从OnStart（）调用.speak（）函数时它不起作用，但是当我从onClickListener（）按钮调用它时它可以正常工作。知道为什么吗？谢谢。

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);

    }

Answer 1

您必须等到TTS子系统发出信号表明它已准备就绪：如果在调用onStart时它没有准备就绪，它将失败。如果您在准备就绪后立即发言，请在PlaySound内致电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);
    }

Answer 2

也许我是盲人，但在你的onStart方法中，你并没有打电话

PlaySound()

就像你在

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

从OnStart调用TextToSpeech API时不起作用

2 个答案: