无论如何,我可以在离线模式下使用Android的Voice to Text功能.

在给定的示例VoiceRecognition.java中,它使用目标RecognizerIntent.ACTION_RECOGNIZE_SPEECH启动和活动.

这是否意味着需要先安装任何其他apk才能使用此功能,或者我是否需要编写自己的应用程序来启动此意图.

我一直在寻找这个,但是很困惑……

这是我用过的代码..

private static final int VOICE_RECOGNITION_REQUEST_CODE = 1234;

private ListView mList;

/**

* Called with the activity is first created.

*/

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

// Inflate our UI from its XML layout description.

setContentView(R.layout.voice_recognition);

// Get display items for later interaction

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

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

// Check to see if a recognition activity is present

PackageManager pm = getPackageManager();

List 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");

}

}

/**

* Handle the click on the start recognition button.

*/

public void onClick(View v) {

if (v.getId() == R.id.btn_speak) {

startVoiceRecognitionActivity();

}

}

/**

* Fire an intent to start the speech 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, "Speech recognition demo");

startActivityForResult(intent, VOICE_RECOGNITION_REQUEST_CODE);

}

/**

* Handle the results from the recognition activity.

*/

@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 matches = data.getStringArrayListExtra(

RecognizerIntent.EXTRA_RESULTS);

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

matches));

}

super.onActivityResult(requestCode, resultCode, data);

}

在运行此代码时,它会使识别器不存在,这意味着不存在此类活动.怎么解决这个？