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

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);
                }
       }
}
​