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Android中实现语音识别码.如何从Android中的数组列表中获取特定位置的元素？我尝试将arraylist转换为数组并重新生成.仍然代码不工作.

package com.espeaker;

public class EspeakerActivity extends Activity {

private static final int REQUEST_CODE = 1234;

private ListView wordsList;

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

Button speakButton = (Button) findViewById(R.id.speakButton);

wordsList = (ListView) findViewById(R.id.list);

// Disable button if no recognition service is present

PackageManager pm = getPackageManager();

List activities = pm.queryIntentActivities(

new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH), 0);

if (activities.size() == 0)

{

speakButton.setEnabled(false);

speakButton.setText("Recognizer not present");

}

}

/**

* Handle the action of the button being clicked

*/

public void speakButtonClicked(View v)

{

startVoiceRecognitionActivity();

}

/**

* Fire an intent to start the voice recognition activity.

*/

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, "Voice recognition Demo...");

startActivityForResult(intent, REQUEST_CODE);

}

/**

* Handle the results from the voice recognition activity.

*/

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data)

{

if (requestCode == REQUEST_CODE && resultCode == RESULT_OK)

{

// Populate the wordsList with the String values the recognition engine thought it heard

ArrayList matches = data.getStringArrayListExtra(

RecognizerIntent.EXTRA_RESULTS);

wordsList.setAdapter(new ArrayAdapter(this, android.R.layout.simple_list_item_1,

matches));

String[] array=matches.toArray(new String[matches.size()]);

// ArrayList places = new ArrayList(

// Arrays.asList("black", "blue", "red"));

ArrayAdapter adapter = new ArrayAdapter(this, R.layout.list_item,matches);

final AutoCompleteTextView input_text = (AutoCompleteTextView) findViewById(R.id.auto);

Button button1 = (Button) findViewById(R.id.button1);

input_text.setAdapter(adapter);

button1.setText(" "+array[0]);

// button1.setText(""+matches);

}

super.onActivityResult(requestCode, resultCode, data);

}

}