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.csdn.net/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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