Android语音识别方法

• android语音识别方法一：使用intent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intent来调出语言识别界面，录音并识别后将识别的字串返回给应用程序。注意：使用前需要安装语音识别程序如语音搜索。

2.
本例参考自android例程：
development/samples/ApiDemos/src/com/example/android/apis/app/VoiceRecognition.java

3.
可从此处下载可独立运行的代码：
4.
核心代码及说明

package com.android.mystt1;

import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.os.Bundle;
import android.speech.RecognizerIntent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;

import java.util.ArrayList;
import java.util.List;

public class MyStt1Activity extends Activity implements OnClickListener {
       private static final int VOICE_RECOGNITION_REQUEST_CODE = 1234;
       private ListView mList;          // 显示识别后字串的list控件

       @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
                 mList = (ListView) findViewById(R.id.list);
                PackageManager pm = getPackageManager();
                List activities = pm.queryIntentActivities(
                          new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH), 0); //本地识别程序
//                       new Intent(RecognizerIntent.ACTION_WEB_SEARCH), 0); // 网络识别程序
                if (activities.size() != 0) {
                         speakButton.setOnClickListener(this);
                } else {                 // 若检测不到语音识别程序在本机安装，测将扭铵置灰
                         speakButton.setEnabled(false);
                         speakButton.setText("Recognizer not present");
                }
       }

       public void onClick(View v) {
                if (v.getId() == R.id.btn_speak) {
                         startMysttActivityActivity();
                }
       }

       private void startMysttActivityActivity() {          // 开始识别
                Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
                intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
                                   RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
                intent.putExtra(RecognizerIntent.EXTRA_PROMPT, "Speech recognition demo");
                startActivityForResult(intent, VOICE_RECOGNITION_REQUEST_CODE);
                // 调出识别界面
    }

       @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
                if (requestCode == VOICE_RECOGNITION_REQUEST_CODE && resultCode == RESULT_OK) {
                         // Fill the list view with the strings the recognizer thought it could have heard
                         ArrayList matches = data.getStringArrayListExtra(
                                            RecognizerIntent.EXTRA_RESULTS);
                         mList.setAdapter(new ArrayAdapter(this, android.R.layout.simple_list_item_1,
                                            matches));
                }
                // 语音识别后的回调，将识别的字串在list中显示
                super.onActivityResult(requestCode, resultCode, data);
       }
}

 

• 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：代码在一楼
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);
                }
       }
}

 

• 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)：源代码在一楼
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));
                }
       }
}