android VoiceRecognition 语音识别并打印到列表上

package com.example.wenandroid;import java.util.ArrayList;import java.util.List;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;public class VoiceRecognizeDemo extends Activity implements OnClickListener {private static final int VOICE_RECOGNITION_REQUEST_CODE=1234;private ListView listview;private Button btn;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.voicerecogenize);listview=(ListView)findViewById(R.id.listview);btn=(Button)findViewById(R.id.btn);PackageManager pm=getPackageManager();List<ResolveInfo> activities = pm.queryIntentActivities(            new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH), 0);    if (activities.size() != 0) {        btn.setOnClickListener(this);    } else {        btn.setEnabled(false);        btn.setText("Recognizer not present");    }}@Overridepublic void onClick(View v) {if(v.getId()==R.id.btn){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);}@Overrideprotected 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);            listview.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,                    matches));        }super.onActivityResult(requestCode, resultCode, data);}}

界面只有一个listview和一个button。