/**
* Copyright (C) 2014 The Android Open Source Project
*
* 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.service.voice;
import android.annotation.SdkConstant;
import android.app.Service;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.hardware.soundtrigger.KeyphraseEnrollmentInfo;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.provider.Settings;
import com.android.internal.annotations.VisibleForTesting;
import com.android.internal.app.IVoiceInteractionManagerService;
import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.util.Locale;
/**
* Top-level service of the current global voice interactor, which is providing
* support for hotwording etc.
* The current VoiceInteractionService that has been selected by the user is kept
* always running by the system, to allow it to do things like listen for hotwords
* in the background.
*
* <p>Because this service is always running, it should be kept as lightweight as
* possible. Heavy-weight operations (including showing UI) should be implemented
* in the associated {@link android.service.voice.VoiceInteractionSessionService}
* that only runs while the operation is active.
*/
public class VoiceInteractionService extends Service {
/**
* The {@link Intent} that must be declared as handled by the service.
* To be supported, the service must also require the
* {@link android.Manifest.permission#BIND_VOICE_INTERACTION} permission so
* that other applications can not abuse it.
*/
@SdkConstant(SdkConstant.SdkConstantType.SERVICE_ACTION)
public static final String SERVICE_INTERFACE =
"android.service.voice.VoiceInteractionService";
/**
* Name under which a VoiceInteractionService component publishes information about itself.
* This meta-data should reference an XML resource containing a
* <code><{@link
* android.R.styleable#VoiceInteractionService voice-interaction-service}></code> tag.
*/
public static final String SERVICE_META_DATA = "android.voice_interaction";
IVoiceInteractionService mInterface = new IVoiceInteractionService.Stub() {
@Override public void ready() {
mHandler.sendEmptyMessage(MSG_READY);
}
@Override public void shutdown() {
mHandler.sendEmptyMessage(MSG_SHUTDOWN);
}
@Override public void soundModelsChanged() {
mHandler.sendEmptyMessage(MSG_SOUND_MODELS_CHANGED);
}
};
MyHandler mHandler;
IVoiceInteractionManagerService mSystemService;
private final Object mLock = new Object();
private KeyphraseEnrollmentInfo mKeyphraseEnrollmentInfo;
private AlwaysOnHotwordDetector mHotwordDetector;
static final int MSG_READY = 1;
static final int MSG_SHUTDOWN = 2;
static final int MSG_SOUND_MODELS_CHANGED = 3;
class MyHandler extends Handler {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MSG_READY:
onReady();
break;
case MSG_SHUTDOWN:
onShutdownInternal();
break;
case MSG_SOUND_MODELS_CHANGED:
onSoundModelsChangedInternal();
break;
default:
super.handleMessage(msg);
}
}
}
/**
* Check whether the given service component is the currently active
* VoiceInteractionService.
*/
public static boolean isActiveService(Context context, ComponentName service) {
String cur = Settings.Secure.getString(context.getContentResolver(),
Settings.Secure.VOICE_INTERACTION_SERVICE);
if (cur == null || cur.isEmpty()) {
return false;
}
ComponentName curComp = ComponentName.unflattenFromString(cur);
if (curComp == null) {
return false;
}
return curComp.equals(service);
}
/**
* Initiate the execution of a new {@link android.service.voice.VoiceInteractionSession}.
* @param args Arbitrary arguments that will be propagated to the session.
*/
public void startSession(Bundle args) {
if (mSystemService == null) {
throw new IllegalStateException("Not available until onReady() is called");
}
try {
mSystemService.startSession(mInterface, args);
} catch (RemoteException e) {
}
}
@Override
public void onCreate() {
super.onCreate();
mHandler = new MyHandler();
}
@Override
public IBinder onBind(Intent intent) {
if (SERVICE_INTERFACE.equals(intent.getAction())) {
return mInterface.asBinder();
}
return null;
}
/**
* Called during service initialization to tell you when the system is ready
* to receive interaction from it. You should generally do initialization here
* rather than in {@link #onCreate()}. Methods such as {@link #startSession(Bundle)} and
* {@link #createAlwaysOnHotwordDetector(String, Locale, android.service.voice.AlwaysOnHotwordDetector.Callback)}
* will not be operational until this point.
*/
public void onReady() {
mSystemService = IVoiceInteractionManagerService.Stub.asInterface(
ServiceManager.getService(Context.VOICE_INTERACTION_MANAGER_SERVICE));
mKeyphraseEnrollmentInfo = new KeyphraseEnrollmentInfo(getPackageManager());
}
private void onShutdownInternal() {
onShutdown();
// Stop any active recognitions when shutting down.
// This ensures that if implementations forget to stop any active recognition,
// It's still guaranteed to have been stopped.
// This helps with cases where the voice interaction implementation is changed
// by the user.
safelyShutdownHotwordDetector();
}
/**
* Called during service de-initialization to tell you when the system is shutting the
* service down.
* At this point this service may no longer be the active {@link VoiceInteractionService}.
*/
public void onShutdown() {
}
private void onSoundModelsChangedInternal() {
synchronized (this) {
if (mHotwordDetector != null) {
// TODO: Stop recognition if a sound model that was being recognized gets deleted.
mHotwordDetector.onSoundModelsChanged();
}
}
}
/**
* Creates an {@link AlwaysOnHotwordDetector} for the given keyphrase and locale.
* This instance must be retained and used by the client.
* Calling this a second time invalidates the previously created hotword detector
* which can no longer be used to manage recognition.
*
* @param keyphrase The keyphrase that's being used, for example "Hello Android".
* @param locale The locale for which the enrollment needs to be performed.
* @param callback The callback to notify of detection events.
* @return An always-on hotword detector for the given keyphrase and locale.
*/
public final AlwaysOnHotwordDetector createAlwaysOnHotwordDetector(
String keyphrase, Locale locale, AlwaysOnHotwordDetector.Callback callback) {
if (mSystemService == null) {
throw new IllegalStateException("Not available until onReady() is called");
}
synchronized (mLock) {
// Allow only one concurrent recognition via the APIs.
safelyShutdownHotwordDetector();
mHotwordDetector = new AlwaysOnHotwordDetector(keyphrase, locale, callback,
mKeyphraseEnrollmentInfo, mInterface, mSystemService);
}
return mHotwordDetector;
}
/**
* @return Details of keyphrases available for enrollment.
* @hide
*/
@VisibleForTesting
protected final KeyphraseEnrollmentInfo getKeyphraseEnrollmentInfo() {
return mKeyphraseEnrollmentInfo;
}
private void safelyShutdownHotwordDetector() {
try {
synchronized (mLock) {
if (mHotwordDetector != null) {
mHotwordDetector.stopRecognition();
mHotwordDetector.invalidate();
mHotwordDetector = null;
}
}
} catch (Exception ex) {
// Ignore.
}
}
@Override
protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
pw.println("VOICE INTERACTION");
synchronized (mLock) {
pw.println(" AlwaysOnHotwordDetector");
if (mHotwordDetector == null) {
pw.println(" NULL");
} else {
mHotwordDetector.dump(" ", pw);
}
}
}
}
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