20

My android application has text to speak feature and more then one activity uses this feature. So created a static helper class to made this easy.

import java.util.Locale;

import android.content.Context;
import android.speech.tts.TextToSpeech;
import android.speech.tts.TextToSpeech.OnInitListener;
import android.util.Log;

public class TextToSpeechController implements OnInitListener {

    private static final String TAG = "TextToSpeechController";
    private TextToSpeech myTTS;
    private String textToSpeak;
    private Context context;

    private static TextToSpeechController singleton;

    public static TextToSpeechController getInstance(Context ctx) {
        if (singleton == null)
            singleton = new TextToSpeechController(ctx);
        return singleton;
    }

    private TextToSpeechController(Context ctx) {
        context = ctx;
    }

    public void speak(String text) {
        textToSpeak = text;

        if (myTTS == null) {
            // currently can't change Locale until speech ends
            try {
                // Initialize text-to-speech. This is an asynchronous operation.
                // The OnInitListener (second argument) is called after
                // initialization completes.
                myTTS = new TextToSpeech(context, this);

            } catch (Exception e) {             
                e.printStackTrace();
            }
        }

        sayText();

    }

    public void onInit(int initStatus) {
        if (initStatus == TextToSpeech.SUCCESS) {
            if (myTTS.isLanguageAvailable(Locale.UK) == TextToSpeech.LANG_AVAILABLE)
                myTTS.setLanguage(Locale.UK);
        }

        // status can be either TextToSpeech.SUCCESS or TextToSpeech.ERROR.
        if (initStatus == TextToSpeech.SUCCESS) {
            int result = myTTS.setLanguage(Locale.UK);
            if (result == TextToSpeech.LANG_MISSING_DATA
                    || result == TextToSpeech.LANG_NOT_SUPPORTED) {
                Log.e(TAG, "TTS missing or not supported (" + result + ")");
                // Language data is missing or the language is not supported.
                // showError(R.string.tts_lang_not_available);

            } else {
                // Initialization failed.
                Log.e(TAG, "Error occured");
            }

        }
    }

    private void sayText() {
        // ask TTs to say the text
        myTTS.speak(this.textToSpeak, TextToSpeech.QUEUE_FLUSH,     null);
    }

    public void stopTTS() {
        if (myTTS != null) {
            myTTS.shutdown();
            myTTS.stop();
            myTTS = null;
        }
    }

}

I am using this helper class like this.

TextToSpeechController.getInstance(this).speak(readableMessage);

But sometimes i see an error like line beloew at LogCat.

"speak:failed not bound to tts engine"

No exception thrown but nothing readed by TTS. I realized that if i triggered activity from BroadcastReceiver, i got this error. Otherwise if manually open activity from application code works with no problem.

Here is the BroadcastReceiver code

private final BroadcastReceiver mHandleMessageReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String newMessage = intent.getExtras().getString(EXTRA_MESSAGE);            
        String readableMessage = intent.getExtras().getString(READABLE_MESSAGE);    

        Bundle b = new Bundle();
        b.putString(EXTRA_MESSAGE, newMessage);
        b.putString(READABLE_MESSAGE, readableMessage);
        Intent newIntent = new Intent("android.intent.action.MAIN");
        newIntent.setClass(context, Speak.class);
        newIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        newIntent.putExtra("MessageReceived", b);
        newIntent.putExtra("CallType", CallType.NOTIFICATION);
        context.startActivity(newIntent);           
    }
};
4

2 回答 2

8

您的代码不等待 TextToSpeech 类的构造函数的异步返回。你甚至有一条评论说它是异步的。为什么它总是在接收器中失败而不是在我不确定的活动中失败-除此之外，作为前台任务的活动可能具有更高的优先级，并且它恰好在您调用 sayText 之前完成。

如果它必须新建一个新的 TTS 对象，您需要等待调用 sayText 直到 init 调用返回。

于 2012-08-02T13:56:46.387 回答
5

这是我用于文本到语音的代码。对于我的代码，只需键入 speakWords("say something"); 在任何活动中。

public class VoiceRecognition extends Activity implements OnClickListener,
        OnInitListener {

    public static final int VOICE_RECOGNITION_REQUEST_CODE = 1234;

    public Button speakButton;
    // TTS object
    public TextToSpeech myTTS;
    // status check code
    public int MY_DATA_CHECK_CODE = 0;

    // setup TTS
    public void onInit(int initStatus) {

        // check for successful instantiation
        if (initStatus == TextToSpeech.SUCCESS) {
            if (myTTS.isLanguageAvailable(Locale.US) == TextToSpeech.LANG_AVAILABLE)
                myTTS.setLanguage(Locale.US);
        } else if (initStatus == TextToSpeech.ERROR) {
            Toast.makeText(this, "Sorry! Text To Speech failed...",
                    Toast.LENGTH_LONG).show();
        }
    }

    /**
     * Called with the activity is first created.
     */
    @Override
    public void onCreate(Bundle voiceinput) {
        super.onCreate(voiceinput);

        // Inflate our UI from its XML layout description.
        setContentView(R.layout.voice_recognition);

        // check for TTS data
        Intent checkTTSIntent = new Intent();
        checkTTSIntent.setAction(TextToSpeech.Engine.ACTION_CHECK_TTS_DATA);
        startActivityForResult(checkTTSIntent, MY_DATA_CHECK_CODE);

    }

    // speak the user text
    public void speakWords(String speech) {

        // speak straight away
        myTTS.speak(speech, TextToSpeech.QUEUE_FLUSH, null);
    }


    public void onClick(View v) {
        speakWords("hello";
    }


    /**
     * Handle the results from the recognition activity.
     */
    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {

        if (requestCode == MY_DATA_CHECK_CODE) {
            if (resultCode == TextToSpeech.Engine.CHECK_VOICE_DATA_PASS) {
                // the user has the necessary data - create the TTS
                myTTS = new TextToSpeech(this, this);
            } else {
                // no data - install it now
                Intent installTTSIntent = new Intent();
                installTTSIntent
                        .setAction(TextToSpeech.Engine.ACTION_INSTALL_TTS_DATA);
                startActivity(installTTSIntent);
            }
        }

        super.onActivityResult(requestCode, resultCode, data);

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        myTTS.shutdown();
    }
于 2012-08-02T17:06:02.333 回答