语音识别方法三：使用Service调用语音识别程序

1.     说明
以下例程功能为：在应用程序中使用通于访问service调用语言识别功能，录音并识别后将识别的字串通过Listener返回给应用程序。注意：使用前需要安装语音识别服务，如编译安装源码中的development/samples/VoiceRecogitionService。

2.     本例参考自android源码

a)          后台服务
参见development/samples/VoiceRecognitionService/*
此处实现了一个模拟的后台服务，它并未实现真的语音识别，而只是一个框架以示例，编译并安装它，即可在设置的语音输入与输出中看到它，它包含了一个设置界面，当连接这个Service时，如果设置了Letters，则直接返回abc，如果设置了Numbers，则直接返回123
你可以自己实现，用于连接android源码自带的识别引擎srec.

b)         前台程序
参见frameworks/base/core/java/android/speech/Recognition*
它与后台Service交互，此段代码实现在应用程序界面中

3.     可从此处下载可独立运行的代码(前台程序)：
http://download.csdn.net/source/2591401

4.     核心代码及说明

package com.android.mystt3;

 

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.speech.RecognitionListener;

import android.speech.RecognizerIntent;

import android.speech.SpeechRecognizer;

import android.widget.Button;

import android.widget.TextView;

import java.util.ArrayList;

import android.util.Log;

 

public class MyStt3Activity extends Activity implements OnClickListener {

       private TextView mText;

       private SpeechRecognizer sr;

       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);     // 识别按钮

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

                speakButton.setOnClickListener(this);

                sr = SpeechRecognizer.createSpeechRecognizer(this);        // 初始化识别工具，得到句柄

                sr.setRecognitionListener(new listener());         // 注册回调类及函数

       }

 

       class listener implements RecognitionListener            // 回调类的实现

       {

                public void onReadyForSpeech(Bundle params)

                {

                         Log.d(TAG, "onReadyForSpeech");

                }

                public void onBeginningOfSpeech()

                {

                         Log.d(TAG, "onBeginningOfSpeech");

                }

                public void onRmsChanged(float rmsdB)

                {

                         Log.d(TAG, "onRmsChanged");

                }

                public void onBufferReceived(byte[] buffer)

                {

                         Log.d(TAG, "onBufferReceived");

                }

                public void onEndOfSpeech()

                {

                         Log.d(TAG, "onEndofSpeech");

                }

                public void onError(int error)

                {

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

                         mText.setText("error " + error);

                }

                public void onResults(Bundle results)     // 返回识别到的数据

                {

                         String str = new String();

                         Log.d(TAG, "onResults " + results);

                         ArrayList data = results.getStringArrayList(SpeechRecognizer.RESULTS_RECOGNITION);

                         for (int i = 0; i < data.size(); i++)

                         {

                                   Log.d(TAG, "result " + data.get(i));

                                   str += data.get(i);

                         }

                         mText.setText(str);        // 显示被识别的数据

                }

                public void onPartialResults(Bundle partialResults)

                {

                         Log.d(TAG, "onPartialResults");

                }

                public void onEvent(int eventType, Bundle params)

                {

                         Log.d(TAG, "onEvent " + eventType);

                }

       }

 

       public void onClick(View v) {

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

                         sr.startListening(new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH));

                }

       }

}

 

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