android中VoiceRecognition的使用

使用此类前需要安装一个Voice Search,地址http://voice-search.softonic.cn/android/download#downloading

package com.example.androidapi.app;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;import com.example.androidapi.R;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);        setContentView(R.layout.voice_recognition);        Button speakButton = (Button) findViewById(R.id.btn_speak);                mList = (ListView) findViewById(R.id.list);        //检查包中是否存在此apk        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();        }    }    //启动谷歌的语音服务    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) {            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);    }}