Android 初步之语音朗读和语音识别

语音朗读

语音朗读：Text-to-Speech

• 首先确认是否安装了语音包

Intent intent = new Intent(Engine.ACTION_CHECK_TTS_DATA);
startActivityForResult(intent, TTS_DATA_CHECK);

如果安装了语言包那么返回的将是Engine.CHECK_VOICE_DATA_PASS

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
	if (requestCode == TTS_DATA_CHECK) {
		if (resultCode == Engine.CHECK_VOICE_DATA_PASS) {
			//表示已经安装了语言包
		}
		super.onActivityResult(requestCode, resultCode, data);
	}
}

• 创建并初始化TTS

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
	if (requestCode == TTS_DATA_CHECK) {
        if (resultCode == Engine.CHECK_VOICE_DATA_PASS) {
            tts = new TextToSpeech(MainActivity.this, new OnInitListener() {
                public void onInit(int status) {
                    if (status == TextToSpeech.SUCCESS) {
                        ttsInit = true;
                        if (tts.isLanguageAvailable(Locale.UK) > 0) {
                            tts.setLanguage(Locale.UK);
                            tts.setPitch(0.8f);
                            tts.setSpeechRate(1.1f);
                        }
                    } else {
                        Intent intent = new Intent(
                        Engine.ACTION_INSTALL_TTS_DATA);
                        startActivity(intent);
                    }
                }
            });
        }
	}
	super.onActivityResult(requestCode, resultCode, data);
}

• 使用TTS朗读

public void onClick(View v) {
	String str = mTextToSpeechEt.getText().toString().trim();
	switch (v.getId()) {
        case R.id.readBtn:
            if (!TextUtils.isEmpty(str)) {
                if (tts != null && ttsInit) {
                    tts.speak(str, TextToSpeech.QUEUE_ADD, null);
                }
            }
            break;
            default:
            break;
	}
}

• 在销毁的时候关闭TTS资源

protected void onDestroy() {
	if (tts != null) {
		tts.stop();
		tts.shutdown();
	}
	super.onDestroy();
}

语音识别

应用程序中接收输入语音

/*允许在应用程序中接收输入语音*/
Intent intent = new  Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
/*指定用于分析输入音频的语言模型*/
intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
/*指定返回潜在识别的结果*/
intent.putExtra(RecognizerIntent.EXTRA_MAX_RESULTS, 1);
intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE, Locale.CHINA);
/*提示用户讲话*/
intent.putExtra(RecognizerIntent.EXTRA_PROMPT, "请讲话");
startActivityForResult(intent, RECOGNIZE);

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
	if(requestCode==RECOGNIZE){
	if(resultCode==RESULT_OK){
		 ArrayList<String> result = data.getStringArrayListExtra(
				RecognizerIntent.EXTRA_RESULTS);
		float [] configence = 		
		            data.getFloatArrayExtra(
				RecognizerIntent.EXTRA_CONFIDENCE_SCORES);
		StringBuffer sb = new StringBuffer();
		for(int i=0;i<result.size();i++){
			sb.append(result.get(i)+":   "+configence[i]+'\n');
		}
		mResultTV.setText(sb.toString());
	}}
	super.onActivityResult(requestCode, resultCode, data);
}

启动网络搜索

Intent webIntent = new Intent(RecognizerIntent.ACTION_WEB_SEARCH);
webIntent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_WEB_SEARCH);
startActivityForResult(webIntent, 0);