android wearable-Adding Voice Capabilities

》Adding Voice Capabilities

 Wear provides two types of voice actions:

System-provided

These voice actions are task-based and are built into the Wear platform. You filter for them in the activity that you want to start when the voice action is spoken. Examples include "Take a note" or "Set an alarm".

App-provided

These voice actions are app-based, and you declare them just like a launcher icon. Users say "Start " to use these voice actions and an activity that you specify starts.

 For example, for the "Take a note" command, declare this intent filter to start an activity namedMyNoteActivity:

  <activity android:name="MyNoteActivity">
      <intent-filter>
          <action android:name="android.intent.action.SEND" />
          <category android:name="com.google.android.voicesearch.SELF_NOTE" />
      </intent-filter>
  </activity>

In your app, you call  startActivityForResult()  using the  ACTION_RECOGNIZE_SPEECH  action. This starts the speech recognition activity, and you can then handle the result in  onActivityResult() .

private static final int SPEECH_REQUEST_CODE = 0;

// Create an intent that can start the Speech Recognizer activity
private void displaySpeechRecognizer() {
    Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
    intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
            RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
// Start the activity, the intent will be populated with the speech text
    startActivityForResult(intent, SPEECH_REQUEST_CODE);
}

// This callback is invoked when the Speech Recognizer returns.
// This is where you process the intent and extract the speech text from the intent.
@Override
protected void onActivityResult(int requestCode, int resultCode,
        Intent data) {
    if (requestCode == SPEECH_REQUEST_CODE && resultCode == RESULT_OK) {
        List<String> results = data.getStringArrayListExtra(
                RecognizerIntent.EXTRA_RESULTS);
        String spokenText = results.get(0);
        // Do something with spokenText
    }
    super.onActivityResult(requestCode, resultCode, data);
}