Android教程之Android自带的语音识别例子初探

主题：Android教程之Android自带的语音识别例子初探

版权申明：http://yarin.javaeye.com/blog/453262

语音识别技术是在Android SDK1.5中才加入的（RecognizerIntent），这里我们简单的分析一下自带的api例子，其实它就是通过一个Intent的Action动作来完成的。主要有以下两种模式:

ACTION_RECOGNIZE_SPEECH：一般语音识别，在这种模式下我们可以捕捉到语音的处理后的文字列。

ACTION_WEB_SEARCH：网络搜索

该例子同样是使用ACTION_RECOGNIZE_SPEECH模式，我们需要实现onActivityResult方法，当语音识别结束之后的回调函数。

好了，废话不多说，看下面的代码，我加入了注释，重要的本来就不多几行。

Voicerecognition.java代码复制代码

packagecom.example.android.apis.app;
importandroid.app.Activity;
importandroid.content.Intent;
importandroid.content.pm.PackageManager;
importandroid.content.pm.ResolveInfo;
importandroid.os.Bundle;
importandroid.speech.RecognizerIntent;
importandroid.view.View;
importandroid.view.View.OnClickListener;
importandroid.widget.ArrayAdapter;
importandroid.widget.Button;
importandroid.widget.ListView;
importjava.util.ArrayList;
importjava.util.List;
publicclassVoiceRecognitionextendsActivityimplementsOnClickListener{
privatestaticfinalintVOICE_RECOGNITION_REQUEST_CODE=1234;
privateListViewmList;
/**
*Calledwiththeactivityisfirstcreated.
*/
@Override
publicvoidonCreate(BundlesavedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.voice_recognition);
ButtonspeakButton=(Button)findViewById(R.id.btn_speak);
mList=(ListView)findViewById(R.id.list);
//Checktoseeifarecognitionactivityispresent
PackageManagerpm=getPackageManager();
List<ResolveInfo>activities=pm.queryIntentActivities(newIntent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH),0);
if(activities.size()!=0)
{
speakButton.setOnClickListener(this);
}
else
{
speakButton.setEnabled(false);
speakButton.setText("Recognizernotpresent");
}
}
publicvoidonClick(Viewv)
{
if(v.getId()==R.id.btn_speak)
{
startVoiceRecognitionActivity();
}
}
privatevoidstartVoiceRecognitionActivity()
{
//通过Intent传递语音识别的模式
Intentintent=newIntent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
//语言模式和自由形式的语音识别
intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
//提示语音开始
intent.putExtra(RecognizerIntent.EXTRA_PROMPT,"Speechrecognitiondemo");
//开始执行我们的Intent、语音识别
startActivityForResult(intent,VOICE_RECOGNITION_REQUEST_CODE);
}
//当语音结束时的回调函数onActivityResult
@Override
protectedvoidonActivityResult(intrequestCode,intresultCode,Intentdata)
{
if(requestCode==VOICE_RECOGNITION_REQUEST_CODE&&resultCode==RESULT_OK)
{
//取得语音的字符
ArrayList<String>matches=data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
mList.setAdapter(newArrayAdapter<String>(this,android.R.layout.simple_list_item_1,matches));
}
super.onActivityResult(requestCode,resultCode,data);
}
}

package com.example.android.apis.app;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 VoiceRecognition extends Activity implements OnClickListener {        private static final int VOICE_RECOGNITION_REQUEST_CODE = 1234;        private ListView mList;    /**     * Called with the activity is first created.     */    @Override    public void onCreate(Bundle savedInstanceState)     {        super.onCreate(savedInstanceState);        setContentView(R.layout.voice_recognition);        Button speakButton = (Button) findViewById(R.id.btn_speak);                mList = (ListView) findViewById(R.id.list);        // Check to see if a recognition activity is present        PackageManager pm = getPackageManager();        List<ResolveInfo> activities = pm.queryIntentActivities(new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH), 0);        if (activities.size() != 0){speakButton.setOnClickListener(this);}else{speakButton.setEnabled(false);speakButton.setText("Recognizer not present");}    }    public void onClick(View v){if (v.getId() == R.id.btn_speak){startVoiceRecognitionActivity();}}    private void startVoiceRecognitionActivity(){    //通过Intent传递语音识别的模式Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);//语言模式和自由形式的语音识别intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);//提示语音开始intent.putExtra(RecognizerIntent.EXTRA_PROMPT, "Speech recognition demo");//开始执行我们的Intent、语音识别startActivityForResult(intent, VOICE_RECOGNITION_REQUEST_CODE);}    //当语音结束时的回调函数onActivityResult    @Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data){if (requestCode == VOICE_RECOGNITION_REQUEST_CODE && resultCode == RESULT_OK){// 取得语音的字符ArrayList<String> matches = data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);mList.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, matches));}super.onActivityResult(requestCode, resultCode, data);}}

当然这里需要设备的支持，所以模拟器是没有效果的！

实际上在没有设备时会跑出ActivityNotFoundException异常。

这个例子很简单，到此为止，谢谢！

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