Android 轻松实现语音识别

Android 轻松实现语音识别

by Terry_龙,

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：

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;


public   class  VoiceRecognition  extends  Activity  implements  OnClickListener {
    
     private   static   final   int  VOICE_RECOGNITION_REQUEST_CODE  =   1234 ;
    
     private  ListView mList;

     
    @Override
     public   void  onCreate(Bundle savedInstanceState) {
         super .onCreate(savedInstanceState);

         //  Inflate our UI from its XML layout description. 
        setContentView(R.layout.voice_recognition);

         //  Get display items for later interaction 
        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() {
        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);
    }

     
    @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 < 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);
    }
}