Professional Android 4 Application Development

Using Speech Recognition x 439
}
}
tts.setLanguage(Locale.UK);
tts.setPitch(0.8f);
tts.setSpeechRate(1.1f);
speak();
}
}
});
} else {
Intent installVoice = new Intent(Engine.ACTION_INSTALL_TTS_DATA);
startActivity(installVoice);
}
private void speak() {
if (tts != null && ttsIsInit) {
tts.speak(“Hello, Android”, TextToSpeech.QUEUE_ADD, null);
}
}
@Override
public void onDestroy() {
if (tts != null) {
tts.stop();
tts.shutdown();
}
super.onDestroy();
}
code snippet PA4AD_Ch11_TextToSpeach/src/MyActivity.java
USING SPEECH RECOGNITION
Android supports voice input and speech recognition using the
RecognizerIntent class. This API enables you to accept voice
input into your application using the standard voice input dialog, as
shown in Figure 11-6.
To initialize voice recognition, call startNewActivityFor
Result, passing in an Intent that specifies the RecognizerIntent
.ACTION_RECOGNIZE_SPEECH or RecognizerIntent.ACTION_WEB_
SEARCH actions. The former action enables you to receive the input
speech within your application, whereas the latter action enables
you to trigger a web search or voice action using the native
providers.
The launch Intent must include the RecognizerIntent.EXTRA_
LANGUAGE_MODEL extra to specify the language model used to parse
the input audio. This can be either LANGUAGE_MODEL_FREE_FORM
or LANGUAGE_MODEL_WEB_SEARCH; both are available as static constants
from the RecognizerIntent class. FIGURE 11-6