android语音识别方法二：应用程序自己调用语音识别库

1.说明
以下例程功能为：应用程序自身调用语言识别函数，程序以循环方式等待录音并识别后的字串。

2.本例参考自android代码：
frameworks/base/core/java/android/speech/srec/Recognizer.java中注释部分

3.可从此处下载可独立运行的代码：
http://download.youkuaiyun.com/source/2591401

4.核心代码及说明

package com.android.mystt2;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.widget.Button;

import android.widget.TextView;

import android.view.View;

import android.view.View.OnClickListener;

import android.speech.srec.Recognizer;

import android.speech.srec.MicrophoneInputStream;

import java.io.InputStream;

import java.io.IOException;

import android.util.Log;

public class MyStt2Activity extends Activity implements OnClickListener {

private TextView mText;

private static final String TAG = "MyStt3Activity";

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

Button speakButton = (Button) findViewById(R.id.btn_speak);//识别扭按

mText = (TextView) findViewById(R.id.text);//显示识别后的字串

speakButton.setOnClickListener(this);

}

public void onClick(View v) {

if (v.getId() == R.id.btn_speak) {

test();

}

}

void test() {

try {

InputStream audio = new MicrophoneInputStream(11025, 11025 * 5); //设置输入参数

String cdir = Recognizer.getConfigDir(null);//获取语音识别配置目录

Recognizer recognizer = new Recognizer(cdir + "/baseline11k.par");

Recognizer.Grammar grammar = recognizer.new Grammar(cdir

+ "/grammars/VoiceDialer.g2g");

grammar.setupRecognizer();

grammar.resetAllSlots();

grammar.compile();

recognizer.start();//开始识别

while (true) {//循环等待识别结果

switch (recognizer.advance()) {

case Recognizer.EVENT_INCOMPLETE:

case Recognizer.EVENT_STARTED:

case Recognizer.EVENT_START_OF_VOICING:

case Recognizer.EVENT_END_OF_VOICING:

continue;//未完成，继续等待识别结果

case Recognizer.EVENT_RECOGNITION_RESULT:

for (int i = 0; i < recognizer.getResultCount(); i++) {

String result = recognizer.getResult(i,

Recognizer.KEY_LITERAL);

Log.d(TAG, "result " + result);

mText.setText(result);

}//识别到字串，显示并退出循环

break;

case Recognizer.EVENT_NEED_MORE_AUDIO:

recognizer.putAudio(audio)//需要更多音频数据;

continue;

default:

break;

}

break;

}

recognizer.stop();

recognizer.destroy();

audio.close();//回收资源

} catch (IOException e) {

Log.d(TAG, "error", e);

mText.setText("error " + e);

}

}

}

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