處理語音識別返回的字符串數組列表

從上文"啟動 Android 的語音識別(Speech Recognition)功能"可以注意到所返回的結果是一個字符串數組列表(StringArrayList). 我們可以使用列表視圖(ListView)顯示所有返回的結果, 以供用戶選擇最正確的答案.

package com.AndroidSpeechRecognition;

import java.util.ArrayList;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.speech.RecognizerIntent;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.AdapterView.OnItemClickListener;

public class AndroidSpeechRecognition extends Activity {
 
 private static final int RQS_VOICE_RECOGNITION = 1;
 TextView textResult;
 ListView listResult;
 
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
       Button buttonSpeech = (Button)findViewById(R.id.Speech);
       textResult = (TextView)findViewById(R.id.Result);
       listResult = (ListView)findViewById(R.id.ResultList);
      
       buttonSpeech.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
       intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
           RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
       intent.putExtra(RecognizerIntent.EXTRA_PROMPT,
           "Start Speech");
       startActivityForResult(intent, RQS_VOICE_RECOGNITION);
   }});
   }

 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  // TODO Auto-generated method stub
  if(requestCode == RQS_VOICE_RECOGNITION){
   if(resultCode == RESULT_OK){

    ArrayList<String> result = data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
    String firstMatch = (String)result.get(0);
    textResult.setText(firstMatch);
    
    ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this,
               android.R.layout.simple_list_item_1, result);
    listResult.setAdapter(arrayAdapter);
    
    listResult.setOnItemClickListener(listResultOnItemClickListener);
   }
  }
 }
 
 private OnItemClickListener listResultOnItemClickListener
 = new ListView.OnItemClickListener(){

  @Override
  public void onItemClick(AdapterView<?> adapter, View view, int position,
    long id) {
   // TODO Auto-generated method stub
   String selectedResult = adapter.getItemAtPosition(position).toString();
   textResult.setText(selectedResult);
  }};

}