Android 语音识别接口

Android 语音识别接口代码：

package com.VoiceRecognition;
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.main);  
 
        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  
    @Override  
    protected 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);  
    }  
}