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;
 
	@Override
protected 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");
    }
 
}
 
	@Override
	public 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);
	}
 
	@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);
	            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。