Android(安卓)轻松实现语音识别

苹果的iphone 有语音识别用的是Google 的技术，做为Google 力推的Android 自然会将其核心技术往Android 系统里面植入，并结合google 的云端技术将其发扬光大。

所以Google Voice Recognition在Android 的实现就变得极其轻松。

语音识别，借助于云端技术可以识别用户的语音输入，包括语音控制等技术，下面我们将利用Google 提供的Api 实现这一功能。

功能点为：通过用户语音将用户输入的语音识别出来，并打印在列表上。

功能界面如下：

用户通过点击speak按钮显示界面：

用户说完话后，将提交到云端搜索：

在云端搜索完成后，返回打印数据：

完整代码如下：

/*
*Copyright(C)2008TheAndroidOpenSourceProject
*
*LicensedundertheApacheLicense,Version2.0(the"License");
*youmaynotusethisfileexceptincompliancewiththeLicense.
*YoumayobtainacopyoftheLicenseat
*
* http://www.apache.org/licenses/LICENSE-2.0
*
*Unlessrequiredbyapplicablelaworagreedtoinwriting,software
*distributedundertheLicenseisdistributedonan"ASIS"BASIS,
*WITHOUTWARRANTIESORCONDITIONSOFANYKIND,eitherexpressorimplied.
*SeetheLicenseforthespecificlanguagegoverningpermissionsand
*limitationsundertheLicense.
*/

package com.example.android.apis.app;

import com.example.android.apis.R;

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;

/**
*SamplecodethatinvokesthespeechrecognitionintentAPI.
*/
public class VoiceRecognition extends Activity implements OnClickListener{

private static final int VOICE_RECOGNITION_REQUEST_CODE = 1234 ;

private ListViewmList;

/**
*Calledwiththeactivityisfirstcreated.
*/
@Override
public void onCreate(BundlesavedInstanceState){
super .onCreate(savedInstanceState);

// InflateourUIfromitsXMLlayoutdescription.
setContentView(R.layout.voice_recognition);

// Getdisplayitemsforlaterinteraction
ButtonspeakButton = (Button)findViewById(R.id.btn_speak);

mList = (ListView)findViewById(R.id.list);

// Checktoseeifarecognitionactivityispresent
PackageManagerpm = 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( " Recognizernotpresent " );
}
}

/**
*Handletheclickonthestartrecognitionbutton.
*/
public void onClick(Viewv){
if (v.getId() == R.id.btn_speak){
startVoiceRecognitionActivity();
}
}

/**
*Fireanintenttostartthespeechrecognitionactivity.
*/
private void startVoiceRecognitionActivity(){
Intentintent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
intent.putExtra(RecognizerIntent.EXTRA_PROMPT, " Speechrecognitiondemo " );
startActivityForResult(intent,VOICE_RECOGNITION_REQUEST_CODE);
}

/**
*Handletheresultsfromtherecognitionactivity.
*/
@Override
protected void onActivityResult( int requestCode, int resultCode,Intentdata){
if (requestCode == VOICE_RECOGNITION_REQUEST_CODE && resultCode == RESULT_OK){
// Fillthelistviewwiththestringstherecognizerthoughtitcouldhaveheard
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);
}
}

Tip：本篇从Api Demo直接复制过来，必须有网络支持。

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