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/*
* Copyright (C) 2009 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package android.speech;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.os.RemoteException;
import android.speech.RecognitionResult;
import android.util.Log;
import java.util.List;
/**
* Utils for Google's network-based speech recognizer, which lets you perform
* speech-to-text translation through RecognitionService. IRecognitionService
* and IRecognitionListener are the core interfaces; you begin recognition
* through IRecognitionService and subscribe to callbacks about when the user
* stopped speaking, results come in, errors, etc. through IRecognitionListener.
* RecognitionServiceUtil includes default IRecognitionListener and
* ServiceConnection implementations to reduce the amount of boilerplate.
*
* The Service provides no user interface. See RecognitionActivity if you
* want the standard voice search UI.
*
* Below is a small skeleton of how to use the recognizer:
*
* ServiceConnection conn = new RecognitionServiceUtil.Connection();
* mContext.bindService(RecognitionServiceUtil.sDefaultIntent,
* conn, Context.BIND_AUTO_CREATE);
* IRecognitionListener listener = new RecognitionServiceWrapper.NullListener() {
* public void onResults(List<String> results) {
* // Do something with recognition transcripts
* }
* }
*
* // Must wait for conn.mService to be populated, then call below
* conn.mService.startListening(null, listener);
*
* {@hide}
*/
public class RecognitionServiceUtil {
public static final Intent sDefaultIntent = new Intent(
RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
// Recognize request parameters
public static final String USE_LOCATION = "useLocation";
public static final String CONTACT_AUTH_TOKEN = "contactAuthToken";
// Bundles
public static final String NOISE_LEVEL = "NoiseLevel";
public static final String SIGNAL_NOISE_RATIO = "SignalNoiseRatio";
private RecognitionServiceUtil() {}
/**
* IRecognitionListener which does nothing in response to recognition
* callbacks. You can subclass from this and override only the methods
* whose events you want to respond to.
*/
public static class NullListener extends IRecognitionListener.Stub {
public void onReadyForSpeech(Bundle bundle) {}
public void onBeginningOfSpeech() {}
public void onRmsChanged(float rmsdB) {}
public void onBufferReceived(byte[] buf) {}
public void onEndOfSpeech() {}
public void onError(int error) {}
public void onResults(List<RecognitionResult> results, long key) {}
}
/**
* Basic ServiceConnection which just records mService variable.
*/
public static class Connection implements ServiceConnection {
public IRecognitionService mService;
public synchronized void onServiceConnected(ComponentName name, IBinder service) {
mService = IRecognitionService.Stub.asInterface(service);
}
public void onServiceDisconnected(ComponentName name) {
mService = null;
}
}
}
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